Author: "B Chaurand" / Topic: 010308 nuclear & particles physics - Searchworks@Jio Institute Digital Library Search Results

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63 results on '"B Chaurand"'

1. Nuclear dependence of light neutral meson production in p–A collisions at 400 GeV with NA60

Author: Pierre Jarron, H. J. Specht, P. Rosinsky, R. Arnaldi, P. Ramalhete, A. Devaux, J. Seixas, J. Lozano, B. Chaurand, T. Poghosyan, Raphael Noel Tieulent, A. Neves, P. Force, G. Puddu, Hiroaki Ohnishi, H. En'yo, A. Uras, Sergio Serci, A. Colla, Enrico Scomparin, P. Parracho, N. Guettet, Alessandro Ferretti, P. Martins, K. Borer, Giulio Usai, Laurent Ducroux, R. Veenhof, J. Fargeix, C. Oppedisano, Michele Floris, R. Shahoyan, Wen-Chang Chen, S. Damjanovic, P. Pillot, A. Masoni, J. M. Heuser, P. Sonderegger, H. K. Wöhri, A. Förster, E. Radermacher, Z. Li, M. Keil, J. Castor, A. Guichard, L. Kluberg, C. Lourenço, Pietro Cortese, Corrado Cicalo, A. De Falco, H. Gulkanian, Franck Manso, K. Banicz, A. David, Laboratoire de Physique de Clermont (LPC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne (UCA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), NA60, Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)
Subjects: NA60, Particle physics, Physics and Astronomy (miscellaneous), Meson, Proton, Nuclear Theory, FOS: Physical sciences, cross section: ratio, lcsh:Astrophysics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Power law, omega(783): decay, Computer Science::Digital Libraries, Spectral line, High Energy Physics - Experiment, transverse momentum: momentum spectrum, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, lcsh:QB460-466, Nuclear Physics - Experiment, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, meson: production, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Engineering (miscellaneous), p nucleus: scattering, Physics, Muon, 010308 nuclear & particles physics, Sigma, dimuon: mass spectrum, p: beam, CERN SPS, eta(958): decay, muon: pair production, Pair production, lcsh:QC770-798, Production (computer science), High Energy Physics::Experiment, Phi(1020): decay
Abstract: The NA60 experiment has studied low-mass muon pair production in proton–nucleus collisions with a system of Be, Cu, In, W, Pb and U targets, using a 400 GeV proton beam at the CERN SPS. The transverse momentum spectra of the $$\rho /\omega $$ ρ/ω and $$\phi $$ ϕ mesons are measured in the full $$p_{\mathrm {T}}$$ pT range accessible, from $$p_{\mathrm {T}}= 0$$ pT=0 up to $$2 \, {\hbox {GeV/c}}$$ 2GeV/c . The nuclear dependence of the production cross sections of the $$\eta $$ η , $$\omega $$ ω and $$\phi $$ ϕ mesons has been found to be consistent with the power law $$\sigma _{\mathrm {pA}} \propto {\mathrm {A}}^\alpha $$ σpA∝Aα , with the $$\alpha $$ α parameter increasing as a function of $$p_{\mathrm {T}}$$ pT for all the particles, and an approximate hierarchy $$\alpha _\eta \approx \alpha _\phi > \alpha _\omega $$ αη≈αϕ>αω . The cross section ratios $$\sigma _\eta /\sigma _\omega $$ ση/σω , $$\sigma _\rho /\sigma _\omega $$ σρ/σω and $$\sigma _\phi /\sigma _\omega $$ σϕ/σω have been studied as a function of the size A of the production target, and an increase of the $$\eta $$ η and $$\phi $$ ϕ yields relative to the $$\omega $$ ω is observed from p–Be to p–U collisions.
Published: 2019
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2. A comparative measurement of ϕ→K+K− and ϕ→μ+μ− in In–In collisions at the CERN SPS

Author: H.K. Wöhri, Z. Li, Enrico Scomparin, B. Chaurand, J. Seixas, Alberto Masoni, P. Ramalhete, P. Pillot, P. Force, P. Rosinsky, H. Enʼyo, A. De Falco, J. Lozano, S. Serci, P. Parracho, S. Damjanovic, A. Colla, Alessandro Ferretti, A. Guichard, H. J. Specht, Wen-Chang Chen, Michele Floris, Laurent Ducroux, G. Puddu, A. Devaux, J. M. Heuser, Chiara Oppedisano, Raphael Noel Tieulent, Hiroaki Ohnishi, A. Förster, A. David, Ruben Shahoyan, G. L. Usai, E. Radermacher, N. Guettet, K. Banicz, A. Uras, J. Fargeix, A. Neves, H. Gulkanian, P. Sonderegger, P. Martins, Franck Manso, J. Castor, M. Keil, Roberta Arnaldi, Rob Veenhof, Pietro Cortese, C. Cicalo, Carlos Lourenco, and T. Poghosyan
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Meson production, Large Hadron Collider, 010308 nuclear & particles physics, Nuclear Theory, Hadron, Inverse, 01 natural sciences, Spectral line, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics
Abstract: The NA60 experiment at the CERN SPS has studied ϕ meson production in In–In collisions at 158 A GeV via both the K + K − and the μ + μ − decay channels. The yields and inverse slope parameters of the m T spectra observed in the two channels are compatible within errors, different from the large discrepancies seen in Pb–Pb collisions between the hadronic (NA49) and dimuon (NA50) decay channels. Possible physics implications are discussed.
Published: 2011
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3. Study of the electromagnetic transition form-factors in η→μ+μ−γ and ω→μ+μ−π0 decays with NA60

Author: A. David, A. Neves, G. Puddu, Ruben Shahoyan, Franck Manso, Alberto Masoni, N. Guettet, P. Sonderegger, H. En'yo, P. Pillot, Michele Floris, Pietro Cortese, Chiara Oppedisano, J. Castor, B. Chaurand, Carlos Lourenco, Corrado Cicalo, A. Colla, A. Guichard, Alessandro Ferretti, E. Radermacher, S. Serci, P. Parracho, H.K. Wöhri, J. M. Heuser, A. Devaux, H. J. Specht, P. Rosinsky, H. Gulkanian, Laurent Ducroux, P. Force, Joao Seixas, Enrico Scomparin, A. De Falco, Hiroaki Ohnishi, S. Damjanovic, P. Martins, Rob Veenhof, J. Lozano, J. Fargeix, G. L. Usai, P. Ramalhete, M. Keil, Roberta Arnaldi, T. Poghosyan, Raphael Noel Tieulent, K. Banicz, and A. Förster
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Muon, Meson, 010308 nuclear & particles physics, Branching fraction, Form factor (quantum field theory), Vector meson dominance, 01 natural sciences, Omega, Spectral line, Nuclear physics, 0103 physical sciences, 010306 general physics, Lepton
Abstract: The NA60 experiment at the CERN SPS has studied low-mass muon pairs in 158 A GeV In–In collisions. The mass and p T spectra associated with peripheral collisions can quantitatively be described by the known neutral meson decays. The high data quality has allowed to remeasure the electromagnetic transition form factors of the Dalitz decays η → μ + μ − γ and ω → μ + μ − π 0 . Using the usual pole approximation F = ( 1 − M 2 / Λ 2 ) − 1 for the form factors, we find Λ −2 (in GeV −2 ) to be 1.95 ± 0.17 ( stat. ) ± 0.05 ( syst. ) for the η and 2.24 ± 0.06 ( stat. ) ± 0.02 ( syst. ) for the ω. While the values agree with previous results from the Lepton-G experiment, the errors are greatly improved, confirming now on the level of 10σ the strong enhancement of the ω form factor beyond the expectation from vector meson dominance. An improved value of the branching ratio BR ( ω → μ + μ − π 0 ) = [ 1.73 ± 0.25 ( stat. ) ± 0.14 ( syst. ) ] × 10 − 4 has been obtained as a byproduct.
Published: 2009
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4. Evidence for the production of thermal muon pairs with masses above 1 GeV/c 2 in 158 A GeV indium-indium collisions

Author: Roberta Arnaldi, Franck Manso, N. Guettet, H. Gulkanian, Z. Li, T. Poghosyan, K. Banicz, J. Fargeix, P. Pillot, Raphael Noel Tieulent, A. Guichard, C. Cicalo, A. Förster, A. David, Ruben Shahoyan, A. Neves, P. Ramalhete, P. Martins, Hiroaki Ohnishi, Wen-Chang Chen, Alberto Masoni, G. Puddu, Michele Floris, S. Damjanovic, Chiara Oppedisano, S. Serci, A. Devaux, K. Borer, Laurent Ducroux, G. L. Usai, Rob Veenhof, H. J. Specht, A. Colla, B. Chaurand, Markus Keil, J. Castor, Alessandro Ferretti, Pietro Cortese, A. De Falco, Carlos Lourenco, L. Kluberg, Joao Seixas, Enrico Scomparin, P. Parracho, J. Lozano, Hermine Katharina Wöhri, P. Rosinsky, E. Radermacher, J. M. Heuser, P. Force, H. En'yo, and P. Sonderegger
Subjects: Physics, Muon, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, Nuclear Theory, chemistry.chemical_element, 01 natural sciences, 7. Clean energy, Nuclear physics, chemistry, Yield (chemistry), 0103 physical sciences, D meson, Thermal, Transverse mass, High Energy Physics::Experiment, Invariant mass, Nuclear Experiment, 010306 general physics, Nucleon, Engineering (miscellaneous), Indium
Abstract: The yield of muon pairs in the invariant mass region 1
Published: 2009
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5. Precision study of the η→μμγ and ω→μ+μμπ0 electromagnetic transition form-factors and of the ρ→μμ line shape in NA60

Author: P. Sonderegger, G. Puddu, Pierre Jarron, H. J. Specht, M. Keil, P. Ramalhete, Roberta Arnaldi, T. Poghosyan, Raphael Noel Tieulent, P. Rosinsky, A. De Falco, B. Chaurand, P. Martins, Franck Manso, A. Förster, J. Fargeix, A. David, Alberto Masoni, E. Radermacher, S. Damjanovic, Wen-Chang Chen, P. Parracho, Ruben Shahoyan, K. Borer, S. Serci, P. Force, N. Guettet, A. Devaux, K. Banicz, Joao Seixas, Michele Floris, H. En'yo, Laurent Ducroux, G. L. Usai, Z. Li, Chiara Oppedisano, A. Uras, P. Pillot, A. Neves, Pietro Cortese, A. Guichard, A. Colla, Alessandro Ferretti, Carlos Lourenco, J. M. Heuser, L. Kluberg, Hiroaki Ohnishi, Enrico Scomparin, H. Gulkanian, J. Lozano, Hermine Katharina Wöhri, Corrado Cicalo, Rob Veenhof, J. Castor, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), NA60, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, Rho meson, Muon, Proton, Meson, Conversion decays, Lepton pairs, Transition form factor, 010308 nuclear & particles physics, Branching fraction, Hadron, 01 natural sciences, Nuclear physics, Pair production, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Atomic physics, 010306 general physics, Lepton
Abstract: The NA60 experiment studied low-mass muon pair production in proton–nucleus (p–A) collisions using a 400 GeV proton beam at the CERN SPS. The low-mass dimuon spectrum is well described by the superposition of the two-body and Dalitz decays of the light neutral mesons η, ρ, ω, η ′ and ϕ, and no evidence of in-medium effects is found. A new high-precision measurement of the electromagnetic transition form factors of the η and ω was performed, profiting from a 10 times larger data sample than the peripheral In–In sample previously collected by NA60. Using the pole-parameterisation | F ( M ) | 2 = ( 1 − M 2 / Λ 2 ) − 2 we find Λ η − 2 = 1.934 ± 0.067 (stat.) ±0.050 (syst.) ( GeV / c 2 ) − 2 and Λ ω − 2 = 2.223 ± 0.026 (stat.) ±0.037 (syst.) ( GeV / c 2 ) − 2 . An improved value of the branching ratio of the Dalitz decay ω → μ + μ − π 0 is also obtained, with B R ( ω → μ + μ − π 0 ) = [ 1.41 ± 0.09 (stat.) ± 0.15 (syst.) ] × 10 − 4 . Further results refer to the ρ line shape and a new limit on ρ / ω interference in hadron interactions.
Published: 2016
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6. Anomalous suppression in In-In collisions at 158 GeV/nucleon

Author: N. Guettet, H. En'yo, R. Averbeck, P. Pillot, G. Puddu, Corrado Cicalo, J. M. Heuser, P. Rosinsky, B. Chaurand, E. Radermacher, Roberta Arnaldi, A. De Falco, A. Colla, Enrico Scomparin, P. Martins, Hermine Katharina Wöhri, A. Devaux, J. Lozano, S. Serci, Alessandro Ferretti, L. Kluberg, Franck Manso, J. Castor, Alberto Masoni, M. Keil, Joao Seixas, A. Guichard, P. Sonderegger, Hiroaki Ohnishi, K. Banicz, A. David, Ruben Shahoyan, P. Force, P. Parracho, Rob Veenhof, A. Neves, H. Gulkanian, A. Drees, Laurent Ducroux, G. L. Usai, S. Damjanovic, Pietro Cortese, Carlos Lourenco, Michele Floris, Chiara Oppedisano, H. J. Specht, Raphael Noel Tieulent, P. Ramalhete, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Tamás Csörgő, Gábor Dávid, Péter Lévai and Gábor Papp, NA60, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Theoretical models, 010306 general physics, Nucleon, 01 natural sciences
Abstract: J / ψ suppression has been studied by the NA60 experiment in Indium-Indium collisions. A new analysis technique, based only on the J / ψ sample, allows to accurately study the centrality dependence of J / ψ production. The observed pattern indicates that a suppression is already present in In-In collisions, setting in at ∼ 90 participant nucleons. A comparison with the available theoretical models is also presented.
Published: 2006
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7. The production of $\rho$ , $\omega$ and $\phi$ vector-mesons by protons and sulphur ions with incident momentum of 200 GeV/c per nucleon

Author: J. Castor, X. Tarrago, P. Bordalo, A. Romana, J.-R. Pizzi, Brigitte Cheynis, A. Baldit, A. Devaux, O. Drapier, B. Chaurand, R. Ferreira, G. Borges, M.C. Abreu, C. Gerschel, J. Astruc, Bruno Espagnon, Ruben Shahoyan, J. Guimaraes, Helena Santos, S. Ramos, C. Baglin, I. Chevrot, C. Quintans, R. Haroutunian, P. Force, Carlos Lourenco, L. Kluberg, J.-Y. Grossiord, M. Bedjidian, A. Bussiere, P. Saturnini, S. Mourgues, P. Petiau, P. Sonderegger, D. Jouan, A. Guichard, and J. Fargeix
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), Meson, 010308 nuclear & particles physics, Sigma, 01 natural sciences, 7. Clean energy, Omega, Spectral line, Nuclear physics, Momentum, 0103 physical sciences, Transverse mass, Production (computer science), Nuclear Experiment, 010306 general physics, Nucleon, Engineering (miscellaneous)
Abstract: The production of $\rho$ , $\omega$ and $\phi$ vector-mesons, detected through their $\mu\mu$ decay channel, is studied in p-W, S-S, S-Cu and S-U reactions at 200 GeV/c per nucleon incident momentum. Their inclusive cross-sections are determined in various transverse momentum intervals and their dependence on the projectile and target mass numbers is investigated. The relative yield $B_{\mu\mu}\sigma_{\phi}/(B_{\mu\mu}\sigma_{\rho} + B_{\mu\mu}\sigma_{\omega})$ is measured, both as a function of the transverse momentum, pT, and of the collision centrality. While this ratio exhibits no significant dependence with pT, it clearly increases with the centrality of the collision. Effective temperatures deduced from the transverse mass spectra, $d\sigma/dM_T$ , lead to values of $T_{\rho + \omega}$ equal or slightly higher than $T_{\phi}$ . Both these effective temperatures smoothly increase from p-W to S-U reactions.
Published: 2005
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8. First results of the NA60 experiment at the CERN SPS

Author: J. Seixas, A. David, Markus Keil, S. Damjanović, Brigitte Cheynis, Jean-Yves Grossiord, Raphael Noel Tieulent, N. Guettet, R. Shahoyan, Laurent Ducroux, Jan Buytaert, P. Force, R. Veenhof, N. De Marco, Chiara Oppedisano, A. Colla, E. Radermacher, Franck Manso, H. En'yo, Wen-Chang Chen, P. Pillot, K. Banicz, Hermine Katharina Wöhri, Alessandro Ferretti, P. Rosinsky, H. J. Specht, A. Neves, B. Chaurand, J. Lozano, Pietro Cortese, Hiroaki Ohnishi, S. Serci, Enrico Scomparin, A. Devaux, A. Drees, J. Castor, G. L. Usai, H. Gulkanian, P. Sonderegger, Z. Li, Carlos Lourenco, Pcf Parracho, L. Kluberg, J. M. Heuser, E. Tveiten, Corrado Cicalo, H. Vardanyan, A. Guichard, K. Borer, P. Ramalhete, Roberta Arnaldi, A. De Falco, A.A. Grigorian, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), ALICE, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), D. Adamova, A. Kugler, P. Tlusty, NA60, Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Muon, Meson production, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Nuclear Theory, 7. Clean energy, 01 natural sciences, Vertex (geometry), law.invention, Nuclear physics, Telescope, Muon spectrometer, law, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics::Accelerator Physics, High Energy Physics::Experiment, Heavy ion, Nuclear Experiment, 010306 general physics
Abstract: NA60; The NA60 experiment at the CERN SPS studies dimuon production in proton and heavy ion collisions. Its silicon pixel vertex telescope allows tracking of muon pairs in the vertex region, complementing the information from the muon spectrometer, and improving the mass resolution and signal-to-noise ratio. First results from the In-In data taking are shown for the light resonances and the J/$\psi$ meson production.
Published: 2005
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9. Charged particle multiplicity in Pb-Pb collisions from the NA50 experiment

Author: R. Haroutunian, Roberta Arnaldi, Sanda Dita, D. Jouan, C. Quintans, M. Atayan, G. Borges, T. Claudino, T.L. Karavitcheva, B. Espagnon, P. Petiau, A. Baldit, Paolo Giubellino, Pietro Cortese, Stefania Beole, Enrico Scomparin, Y.K. Gavrilov, M. Gonin, Serban Constantinescu, X. Tarrago, P. Sonderegger, Mario Sitta, C. Castanier, P. Force, Marek Idzik, O. Drapier, H.R. Gulkanyan, F.F. Guber, Alexey Kurepin, Carlos Lourenco, L. Kluberg, N.S. Topilskaya, P. Saturnini, M. Mac Cormick, Mauro Gallio, V. Boldea, L. Riccati, A. Musso, G. L. Usai, C. Baglin, P. Rato Mendes, S. Serci, Ermanno Vercellin, Luciano Ramello, G. Puddu, J.-R. Pizzi, Bruno Alessandro, B. Chaurand, L. Capelli, N. Willis, A. Devaux, C. Gerschel, F Prino, W.L. Prado da Silva, F. Sigaudo, J.-Y. Grossiord, A. Piccotti, T. Wu, A. Bussiere, M. P. Comets, Enrico Scalas, A. Defalco, A.A. Grigorian, G. Dellacasa, Alberto Masoni, A. Romana, João Cruz, P. Macciotta, Calin Alexa, Helena Santos, M.B. Golubeva, M. Bedjidian, A. Guichard, F. Prino, S. Grigorian, J. Fargeix, A. Marzari-Chiesa, Massimo Masera, P. Bordalo, S. Ramos, R Hokobyan, Brigitte Cheynis, E. Chiavassa, Ruben Shahoyan, N DeMarco, Marco Monteno, Y. Le Bornec, J. Castor, S. Borenstein, L. Villatte, Corrado Cicalo, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), NA50, Laboratoire d'Annecy de Physique des Particules (LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules), Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Physics, History, Large Hadron Collider, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Nuclear Theory, 01 natural sciences, 7. Clean energy, Charged particle, Computer Science Applications, Education, Nuclear physics, Transverse plane, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], 0103 physical sciences, Impact parameter, Multiplicity (chemistry), Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Particle density, Charged particle beam
Abstract: NA50; Angular distributions of charged particles produced in Pb-Pb collisions at the CERN SPS have been measured by the NA50 experiment. Measurements have been performed with a silicon microstrip detector at two different beam energies (40 and 158 GeV/nucleon) and over a wide impact parameter (centrality) range. The centrality of the collision has been evaluated both by neutral transverse energy released in the interaction and by spectator nucleons energy (zero degree energy). The charged particle density at midrapidity shows a linear dependence on the number of participating nucleons at both beam energies. The particle density per participant pair and its $\sqrt{S}$ dependence are also studied.
Published: 2005
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10. The production of , and mesons in p-, d-, S- and Pb-induced reactions at the CERN SPS

Author: Corrado Cicalo, X. Tarrago, C. Castanier, Mario Sitta, Sergio Serci, H.R. Gulkanyan, E. Vercellin, M. Bedjidian, Stefania Beole, W.L. Prado da Silva, F. Sigaudo, N DeMarco, M. Gallio, S. Grigorian, F.F. Guber, P. Force, S. Borenstein, Luciano Ramello, R. Haroutunian, A. Guichard, L. Villatte, Pietro Cortese, Massimo Masera, Y.K. Gavrilov, J. Fargeix, M. Mac Cormick, Enrico Scalas, A. Defalco, A.A. Grigorian, A. Marzari-Chiesa, Marco Monteno, Alexey Kurepin, Y. Le Bornec, E. Chiavassa, Ruben Shahoyan, João Cruz, A. Musso, A. Masoni, F Prino, G. Dellacasa, A. Romana, P. Rato Mendes, Roberta Arnaldi, G. Puddu, Carlos Lourenco, M. P. Comets, Helena Santos, Calin Alexa, G. L. Usai, P. Bordalo, B. Chaurand, L. Kluberg, N.S. Topilskaya, J. Castor, R. Hakobyan, O. Drapier, C. Gerschel, S. Ramos, G. Borges, T.L. Karavitcheva, A. Baldit, C. Baglin, Serban Constantinescu, B. Espagnon, C. Quintans, M. Atayan, Brigitte Cheynis, Bruno Alessandro, J.-R. Pizzi, Enrico Scomparin, L. Riccati, M. Gonin, T. Claudino, J.-Y. Grossiord, P. Macciotta, Marek Idzik, P. Petiau, P. Sonderegger, T. Wu, Sanda Dita, D. Jouan, V. Boldea, L. Capelli, N. Willis, A. Devaux, P. Saturnini, A. Piccotti, A. Bussiere, M.B. Golubeva, and Paolo Giubellino
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Muon, Meson, Proton, 010308 nuclear & particles physics, 7. Clean energy, 01 natural sciences, Omega, Nuclear physics, Pair production, Deuterium, 0103 physical sciences, 010306 general physics
Abstract: From proton, deuteron, S- and Pb-induced reactions, experiments NA38 and NA50 have measured muon pair production with various targets. In particular, the production rates of the , ω and ρ mesons have been simultaneously extracted and compared. Preliminary partial results of the most recent Pb–Pb measurement done in year 2000 by NA50 are presented here. They are also included in the comparison with the results obtained with lighter interacting nuclei.
Published: 2003
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11. New results on J/ψ from the NA50 experiment

Author: A. Piccotti, João Cruz, Roberta Arnaldi, J.-R. Pizzi, F. Prino, A. Bussiere, Ermanno Vercellin, Paolo Giubellino, H.R. Gulkanyan, Helena Santos, M. Mac Cormick, P. Petiau, A. Marzari-Chiesa, W.L. Prado da Silva, F. Sigaudo, F.F. Guber, Y.K. Gavrilov, N. Willis, S. Ramos, O. Drapier, P. Sonderegger, G. Puddu, Luciano Ramello, A. Devaux, M.B. Golubeva, Enrico Scalas, G. L. Usai, Alexey Kurepin, G. Dellacasa, Alberto Masoni, Sanda Dita, D. Jouan, P. Rato Mendes, S. Serci, C. Quintans, M. Atayan, N. De Marco, T. Claudino, B. Chaurand, X. Tarrago, A. Romana, C. Gerschel, Pietro Cortese, Calin Alexa, M. Bedjidian, C. Castanier, Brigitte Cheynis, S. Grigorian, Mauro Gallio, Carlos Lourenco, P. Bordalo, R. Hakobyan, V. Boldea, Enrico Scomparin, L. Kluberg, N.S. Topilskaya, A. De Falco, J.-Y. Grossiord, A. Guichard, Stefania Beole, T. Wu, M. Gonin, L. Capelli, A. Musso, P. Force, Mario Sitta, Marek Idzik, P. Saturnini, J. Fargeix, C. Baglin, P. Macciotta, Massimo Masera, E. Chiavassa, Ruben Shahoyan, M. P. Comets, B. Espagnon, R. Haroutunian, G. Borges, T.L. Karavitcheva, Corrado Cicalo, Marco Monteno, Y. Le Bornec, L. Riccati, J. Castor, S. Borenstein, L. Villatte, A. Baldit, Serban Constantinescu, Bruno Alessandro, and A.A. Grigorian
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Muon, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Nuclear Theory, Plasma, 01 natural sciences, Atomic and Molecular Physics, and Optics, Charged particle, Ion, Renormalization, Nuclear physics, 0103 physical sciences, Quark–gluon plasma, High Energy Physics::Experiment, Heavy ion, Nuclear Experiment, 010306 general physics
Abstract: The NA50 experiment studies the production of J/γ in Pb+Pb collisions. The anomalous J/ψ suppression in relativistic heavy ion collisions, considered an unambiguous signature for the formation of a quark gluon plasma, is studied in the dimuon channel, using as reference the Drell-Yan muon pairs. Preliminary results from the analysis of the 2000 data, with the target region vacuum, are presented and compared to an update of those obtained from previous data samples.
Published: 2003
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12. ψi and production in p-U and S-U collisions at 200

Author: J.-R. Pizzi, Ph. Gorodetzky, Bruno Espagnon, M.C. Abreu, X. Tarrago, F. Malek, Didier Contardo, A. Bussiere, Joao Varela, R.A. Salmeron, P. Sonderegger, C. Racca, A. Romana, R. Ferreira, A. Guichard, Carlos Lourenco, L. Luquin, L. Kluberg, P. Force, Francois Vazeille, J.-Y. Grossiord, B. Ronceux, P. Liaud, R. Kossakowski, E. Descroix, C. Barriere, T. Chambon, R. Haroutunian, J. Fargeix, S. Silva, D. Lazic, G. Landaud, D. Jouan, A. Baldit, C. Baglin, Luis Peralta, P. Bordalo, L. Fredj, A. Devaux, J. Castor, M. Bedjidian, B. Chaurand, J.M. Gago, O. Drapier, B. Grosdidier, C. Gersche, Rachid Mazini, J.P. Guillaud, R. Mandry, and S. Ramos
Subjects: Physics, Nuclear and High Energy Physics, Muon, Meson, 010308 nuclear & particles physics, Branching fraction, Hadron, Quarkonium, 01 natural sciences, Nuclear physics, Particle decay, Pair production, 0103 physical sciences, Atomic physics, 010306 general physics, Nucleon
Abstract: Production and decay into two muons of ψI and J/ψ mesons is studied in p-U and S-U interactions at 200 GeV/nucleon. The ratio Bmumuσ(ψl)/Bmumuσ(J/ψ is found to be 0.0201 ± 0.0044 ± 0.0020 in p-U and 0.0093 ± 0.0011 ± 0.0013 in S-U. For S-U interactions, this ratio decreases by about 40% with increasing transverse energy. Our p-U result confirms previous measurements which show that the relative production of ψt and J ψ in p-A interactions is independent of A. The results are discussed in the frame of QGP formation and final state absorption.
Published: 1994
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13. ψ′ and muon pair production in p-W and S-U collisions

Author: F. Malek, Joao Varela, C. Racca, Bruno Espagnon, P. Sonderegger, L. Luquin, B. Ronceux, G. Landaud, Ph. Gorodetzky, X. Tarrago, C. Baglin, P. Liaud, C. Barriere, A. Baldit, J.-R. Pizzi, E. Descroix, P. Bordalo, R. Kossakowski, S. Ramos, A. Devaux, S. Silva, R. Haroutunian, M.C. Abreu, R.A. Salmeron, J. Castor, B. Grosdidier, J.M. Gago, T. Chambon, R. Ferreira, O. Drapier, A. Guichard, Francois Vazeille, J. Fargeix, A. Romana, R. Mandry, L. Fredj, Luis Peralta, J.-Y. Grossiord, Carlos Lourenco, L. Kluberg, Didier Contardo, Rachid Mazini, J.P. Guillaud, A. Bussiere, D. Jouan, D. Lazic, B. Chaurand, C. Gerschel, M. Bedjidian, and P. Force
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Muon, Meson, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Nuclear Theory, Hadron, Quarkonium, 01 natural sciences, Nuclear physics, Particle decay, Pair production, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon, Lepton
Abstract: In this paper we present a study on the production of the J ψ and ψ′ resonances, decaying into muon pairs, in S-U collisions, at 200 GeV per incident nucleon. We find that the ratio between ψ′ and tJ ψ yields decreases as E T , the neutral transverse energy produced in the collision, increases. There is also a clear decrease of this ratio when going from p-W to S-U interactions. Assuming the high mass continuum to be Drell-Yan we discuss the possible understanding of the intermediate dimuon mass region as a superposition of Drell-Yan (extrapolated down in mass) and muon pairs from the semileptonic decays of charmed mesons. The p-W data is found to be explained by this procedure. However, the S-U data seems to be incompatible with a linear extrapolation from the proton-nucleus results.
Published: 1994
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14. phi production in In–In collisions at 158 A GeV

Author: G. Puddu, J. Lozano, H. J. Specht, A. Guichard, Enrico Scomparin, B. Chaurand, Franck Manso, H.R. Gulkanyan, A. Colla, J. M. Heuser, Alessandro Ferretti, P. Rosinsky, Hiroaki Ohnishi, S. Serci, K. Borer, G. L. Usai, Alberto Masoni, Laurent Ducroux, K. Banicz, Z. Li, A. Uras, P. Force, J. Castor, E. Radermacher, P. Parracho, H. K. Wöhri, A. Förster, J. Fargeix, P. Ramalhete, T. Poghosyan, C. Cicalo, Raphael Noel Tieulent, Philippe Pillot, A. De Falco, S. Damjanovic, P. Martins, Wen-Chang Chen, A. David, A. Neves, A. Devaux, R. Veenhof, M. Keil, Roberta Arnaldi, N. Guettet, H. En'yo, Pietro Cortese, Carlos Lourenco, J. Seixas, P. Sonderegger, Ruben Shahoyan, Michele Floris, Chiara Oppedisano, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), NA60, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Muon, 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, Nuclear Theory, Strangeness, 01 natural sciences, Spectral line, Nuclear physics, 0103 physical sciences, Quark–gluon plasma, Mass spectrum, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Transverse mass, High Energy Physics::Experiment, 010306 general physics, Nucleon, Nuclear Experiment
Abstract: International audience; The NA60 experiment at the CERN SPS studied phi production in In–In collisions at 158 A GeV via muon and kaon decay channels. The yields and transverse mass spectra observed in the two channels are compatible within errors. The results are compared to the previous measurements in Pb–Pb collisions, where large discrepancies were observed between NA50 (muon pairs) and NA49 (kaon pairs).
Published: 2009
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15. J/psi azimuthal anisotropy relative to the reaction plane in Pb-Pb collisions at 158 GeV per nucleon

Author: F. Prino, B. Alessandro, C. Alexa, R. Arnaldi, M. Atayan, S. Beolè, V. Boldea, P. Bordalo, G. Borges, C. Castanier, J. Castor, B. Chaurand, B. Cheynis, E. Chiavassa, C. Cicalò, M. P. Comets, S. Constantinescu, P. Cortese, A. De Falco, N. De Marco, G. Dellacasa, A. Devaux, S. Dita, J. Fargeix, P. Force, M. Gallio, C. Gerschel, P. Giubellino, M. B. Golubeva, A. A. Grigoryan, S. Grigoryan, F. F. Guber, A. Guichard, H. Gulkanyan, M. Idzik, D. Jouan, T. L. Karavicheva, L. Kluberg, A. B. Kurepin, Y. Le Bornec, C. Lourenço, M. Mac Cormick, A. Marzari-Chiesa, M. Masera, A. Masoni, M. Monteno, A. Musso, P. Petiau, A. Piccotti, J. R. Pizzi, G. Puddu, C. Quintans, L. Ramello, S. Ramos, L. Riccati, H. Santos, P. Saturnini, E. Scomparin, S. Serci, R. Shahoyan, F. Sigaudo, M. Sitta, P. Sonderegger, X. Tarrago, N. S. Topilskaya, G. L. Usai, E. Vercellin, L. Villatte, N. Willis, T. Wu, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), NA50, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Meson, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, Theoretical models, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nucl-ex, 01 natural sciences, Dissociation (chemistry), Azimuth, Nuclear physics, Transverse plane, 0103 physical sciences, Nuclear Physics - Experiment, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), 010306 general physics, Nucleon, Anisotropy, Nuclear Experiment, Fourier series, Engineering (miscellaneous)
Abstract: The J/$\psi$ azimuthal distribution relative to the reaction plane has been measured by the NA50 experiment in Pb-Pb collisions at 158 GeV/nucleon. Various physical mechanisms related to charmonium dissociation in the medium created in the heavy ion collision are expected to introduce an anisotropy in the azimuthal distribution of the observed J/$\psi$ mesons at SPS energies. Hence, the measurement of J/$\psi$ elliptic anisotropy, quantified by the Fourier coefficient v$_2$ of the J/$\psi$ azimuthal distribution relative to the reaction plane, is an important tool to constrain theoretical models aimed at explaining the anomalous J/$\psi$ suppression observed in Pb-Pb collisions. We present the measured J/$\psi$ yields in different bins of azimuthal angle relative to the reaction plane, as well as the resulting values of the Fourier coefficient v$_{2}$ as a function of the collision centrality and of the J/$\psi$ transverse momentum. The reaction plane has been estimated from the azimuthal distribution of the neutral transverse energy detected in an electromagnetic calorimeter. The analysis has been performed on a data sample of about 100 000 events, distributed in five centrality or p$_{\rm T}$ sub-samples. The extracted v$_{2}$ values are significantly larger than zero for non-central collisions and are seen to increase with p$_{\rm T}$., Comment: proceedings of HP08 conference corrected a typo in one equation
Published: 2009
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16. φ, ϱ, and ω production in pU, OU and SU reactions at 200 GeV per nucleon

Author: Ph. Gorodetzky, B. Grosdidier, R. Ferreira, R. Kossakowski, G. Landaud, L. Fredj, S. Papillon, Francois Vazeille, A. Romana, R. Cases, Claude Charlot, E. Descroix, P. Bordalo, S. Ramos, M.C. Abreu, A. Baldit, X. Tarrago, F. Staley, A. Devaux, Philippe Busson, S. Silva, J. Castor, A. Guichard, P. Liaud, Luis Peralta, T. Chambon, P. Sonderegger, J. Fargeix, A. Baldisseri, D. Jouan, M. Bedjidian, C. Racca, R. Haroutunian, Joao Varela, A. Bussière, O. Drapier, Didier Contardo, C. Baglin, J.M. Gago, Carlos Lourenco, L. Kluberg, J.-R. Pizzi, X. Felgeyrolles, J.-Y. Grossiord, B. Chaurand, C. Gerschel, J. P. Guillaud, and P. Force
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Muon, 010308 nuclear & particles physics, Nuclear Theory, Hadron, Continuum (design consultancy), 7. Clean energy, 01 natural sciences, Ion, Nuclear physics, Pair production, Yield (chemistry), 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon, Low Mass
Abstract: Low mass muon pair production at high P T and low X F studied in pU, OU and SU 200 GeV per nucleon react ions. When energy density or projectile mass are increased, φ production is enhanced as compared with the yield of muon pairs in the mass continuum (1.7 M μμ c 2 ), whereas the production of ω and ϱ, experimentally unresolved, remains approximately constant. This φ enhancement is in agreement with predictions based on quark-gluon plasma formation and, together with the previously reported J/Ψ suppression, puts severe constraints on a purely hadronic description of nucleus-nucleus collisions.
Published: 1991
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17. Initial state interactions and J/ψ production in nucleus-nucleus collisions

Author: F. Vazeille, Ph. Gorodetzky, A. Bussiere, C. Baglin, J.-R. Pizzi, Philippe Busson, S. Silva, M. Bedjidian, M.C. Abreu, O. Drapier, J. Fargeix, A. Romana, Joao Varela, L. Fredj, S. Papillon, A. Baldisseri, R. Haroutunian, Didier Contardo, R. Ferreira, J. Castor, Luis Peralta, G. Landaud, J.P. Guillaud, X. Tarrago, B. Chaurand, R. Kossakowski, C. Gerschel, C. Racca, A. Guichard, Carlos Lourenco, L. Kluberg, T. Chambon, J.M. Gago, P. Bordalo, F. Staley, Claude Charlot, A. Devaux, B. Grosdidier, S. Ramos, A. Baldit, P. Force, P. Sonderegger, J.-Y. Grossiord, C. Barriere, P. Liaud, D. Jouan, E. Descroix, Laboratoire d'Annecy de Physique des Particules (LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules), Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), ALICE, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), NA38, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear reaction, Physics, Nuclear and High Energy Physics, Quantitative Biology::Neurons and Cognition, Meson, 010308 nuclear & particles physics, Hadron, Elementary particle, Quarkonium, 01 natural sciences, Nuclear physics, medicine.anatomical_structure, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], 0103 physical sciences, medicine, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Nucleus, Boson
Abstract: The mean squared transverse momentum of J/ψ's measured in pCu, pU, OCu, OU and SU collisions at 200 GeV/ nucleon is analyzed in terms of initial state interactions. Taking this effect into account, the mechanism which suppresses the J/ψ production in ion-induced collisions would only have a weak PT dependence.
Published: 1991
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18. Transverse momentum of produced in pCu, pU, 16OCu, 16OU and 32SU collisions at 200 GeV per nucleon

Author: R. Haroutunian, X. Tarrago, F. Staley, X. Felgeyrolles, P. Busson, Joao Varela, P. Liaud, O. Drapier, A. Romana, M. Bedjidian, Ph. Gorodetzky, B. Chaurand, D. Jouan, R. Kossakowski, J.-R. Pizzi, C. Gerschel, S. Silva, A. Baldisseri, E. Descroix, J.-Y. Grossiord, Claude Charlot, R.A. Salmeron, M. Alimi, J.M. Gago, C. Baglin, P. Force, L. Fredj, S. Papillon, A. Guichard, M.C. Abreu, Luis Peralta, P. Bordalo, A. Bussière, R. Ferreira, A. Devaux, G. Landaud, B. Grosdidier, Francois Vazeille, R. Cases, C. Racca, S. Ramos, A. Baldit, Carlos Lourenco, L. Kluberg, J. Castor, P. Sonderegger, Didier Contardo, T. Chambon, J. P. Guillaud, and J. Fargeix
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, 0103 physical sciences, Transverse momentum, 010306 general physics, Nucleon, 01 natural sciences
Published: 1991
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19. J/ψProduction in Indium-Indium Collisions at158 GeV/Nucleon

Author: Hiroaki Ohnishi, Laurent Ducroux, B. Chaurand, P. Rosinsky, T. Poghosyan, A. Devaux, Raphael Noel Tieulent, K. Banicz, A. Neves, N. Guettet, H. J. Specht, S. Serci, H. En'yo, A. Colla, J. Seixas, Franck Manso, P. Sonderegger, Alessandro Ferretti, E. Radermacher, Alberto Masoni, Enrico Scomparin, P. Martins, Pietro Cortese, P. Ramalhete, L. Kluberg, Carlos Lourenco, J. Fargeix, P. Parracho, J. Lozano, J. M. Heuser, H. Gulkanian, A. Guichard, A. De Falco, P. Pillot, J. Castor, S. Damjanovic, A. Förster, Corrado Cicalo, G. L. Usai, G. Puddu, Rob Veenhof, Hermine Katharina Wöhri, Michele Floris, Chiara Oppedisano, A. David, Ruben Shahoyan, M. Keil, Roberta Arnaldi, and P. Force
Subjects: Physics, Particle physics, Large Hadron Collider, Muon, 010308 nuclear & particles physics, Nuclear Theory, General Physics and Astronomy, chemistry.chemical_element, Nuclear matter, 01 natural sciences, Super Proton Synchrotron, Nuclear physics, Pair production, chemistry, 0103 physical sciences, Quark–gluon plasma, Nuclear Experiment, 010306 general physics, Nucleon, Indium
Abstract: The NA60 experiment studies muon pair production at the CERN Super Proton Synchrotron. In this Letter we report on a precision measurement of J/{psi} in In-In collisions. We have studied the J/{psi} centrality distribution, and we have compared it with the one expected if absorption in cold nuclear matter were the only active suppression mechanism. For collisions involving more than {approx}80 participant nucleons, we find that an extra suppression is present. This result is in qualitative agreement with previous Pb-Pb measurements by the NA50 experiment, but no theoretical explanation is presently able to coherently describe both results.
Published: 2007
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20. $J/\psi$ and $\psi'$ production and their normal nuclear absorption in proton-nucleus collisions at 400 GeV

Author: Mauro Gallio, Paolo Giubellino, V. Boldea, N. Willis, Marco Monteno, Y. Le Bornec, A. Devaux, G. Borges, S. Serci, Alberto Masoni, Calin Alexa, X. Tarrago, Ara Grigoryan, Massimo Masera, C. Quintans, M. Atayan, H.R. Gulkanyan, J. Fargeix, Sanda Dita, D. Jouan, Stefania Beole, Roberta Arnaldi, M.B. Golubeva, M. P. Comets, J. Castor, P. Bordalo, Corrado Cicalo, A. De Falco, P. Force, Serban Constantinescu, J.-Y. Grossiord, Pietro Cortese, G. Puddu, P. Saturnini, Enrico Scomparin, Mario Sitta, E. Chiavassa, Brigitte Cheynis, P. Petiau, G. L. Usai, Ruben Shahoyan, A. Guichard, A. Piccotti, B. Chaurand, P. Sonderegger, Ermanno Vercellin, Marek Idzik, F. Prino, C. Gerschel, Carlos Lourenco, Alexey Kurepin, L. Kluberg, L. Villatte, N. De Marco, M. Mac Cormick, N.S. Topilskaya, A. Musso, J.-R. Pizzi, Bruno Alessandro, Tatiana Karavicheva, F.F. Guber, Luciano Ramello, L. Riccati, A. Marzari-Chiesa, S. Ramos, G. Dellacasa, Helena Santos, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), ALICE, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), NA50, Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear reaction, Particle physics, Physics and Astronomy (miscellaneous), Proton, Meson, Hadron, Nuclear Theory, FOS: Physical sciences, Elementary particle, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Physics - Experiment, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Engineering (miscellaneous), Physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Drell–Yan process, Nuclear matter, Quarkonium, High Energy Physics::Experiment
Abstract: We report a new measurement of J/psi, psi' and Drell-Yan cross-sections, in the kinematical domain $-0.425, Comment: Accepted for publication in Euro. Phys. J. C
Published: 2007
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21. $\psi'$ production in Pb-Pb collisions at 158 GeV/nucleon

Author: Marek Idzik, A. Musso, A. Piccotti, F. Prino, Mauro Gallio, V. Boldea, H.R. Gulkanyan, Paolo Giubellino, P. Bordalo, A. De Falco, J. Fargeix, P. Petiau, A. Marzari-Chiesa, M. Mac Cormick, Alberto Masoni, Alexey Kurepin, P. Saturnini, S. Serci, C. Quintans, M. Atayan, Brigitte Cheynis, M. P. Comets, Massimo Masera, S. Ramos, N. Willis, A. Devaux, Enrico Scomparin, M. Gonin, Sanda Dita, Pietro Cortese, Stefania Beole, E. Chiavassa, Ruben Shahoyan, D. Jouan, A. Guichard, Ara Grigoryan, Ermanno Vercellin, P. Force, A. Romana, Calin Alexa, F.F. Guber, G. Puddu, N. De Marco, Luciano Ramello, G. Dellacasa, G. L. Usai, Helena Santos, B. Chaurand, Mario Sitta, C. Gerschel, Carlos Lourenco, L. Riccati, L. Kluberg, O. Drapier, N.S. Topilskaya, J.-R. Pizzi, X. Tarrago, M.B. Golubeva, Bruno Alessandro, Tatiana Karavicheva, G. Borges, Corrado Cicalo, P. Sonderegger, Marco Monteno, Y. Le Bornec, J. Castor, L. Villatte, Serban Constantinescu, J.-Y. Grossiord, Roberta Arnaldi, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), ALICE, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), NA50, Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Systematic error, Particle physics, Physics and Astronomy (miscellaneous), Meson, 010308 nuclear & particles physics, Nuclear Theory, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Nuclear physics, Momentum, Electromagnetic calorimeter, 0103 physical sciences, High Energy Physics::Experiment, Open charm, Nuclear Experiment (nucl-ex), 010306 general physics, Nucleon, Nuclear Experiment, Engineering (miscellaneous)
Abstract: psi' production is studied in Pb-Pb collisions at 158 GeV/c per nucleon incident momentum. Absolute cross-sections are measured and production rates are investigated as a function of the centrality of the collision. The results are compared with those obtained for lighter colliding systems and also for the J/psi meson produced under identical conditions., Comment: Accepted for publication in Euro. Phys. J. C
Published: 2007
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22. NA60 results on $p_T$ spectra and the $\rho$ spectral function in In-In collisions

Author: J Seixas, the NA60 Collaboration, R Arnaldi, R Averbeck, K Banicz, J Castor, B Chaurand, C Cicalò, A Colla, P Cortese, S Damjanovic, A David, A De Falco, A Devaux, A Drees, L Ducroux, H En'yo, A Ferretti, M Floris, A Förster, P Force, N Guettet, A Guichard, H Gulkanian, M Keil, L Kluberg, C Lourenço, J Lozano, F Manso, A Masoni, P Martins, A Neves, H Ohnishi, C Oppedisano, P Parracho, P Pillot, G Puddu, E Radermacher, P Ramalhete, P Rosinsky, E Scomparin, S Serci, R Shahoyan, P Sonderegger, H J Specht, R Tieulent, G Usai, R Veenhof, H K Wöhri, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), NA60, Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Physics, Nuclear and High Energy Physics, Muon, Large Hadron Collider, Meson, 010308 nuclear & particles physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Spectral line, Nuclear physics, Yield (chemistry), 0103 physical sciences, Mass spectrum, Radial flow, High Energy Physics::Experiment, Spectral function, 010306 general physics, Nuclear Experiment
Abstract: The NA60 experiment at the CERN SPS has studied low-mass muon pairs in 158 AGeV In-In collisions. A strong excess of pairs is observed above the yield expected from neutral meson decays. The unprecedented sample size of close to 400K events and the good mass resolution of about 2% have made it possible to isolate the excess by subtraction of the decay sources (keeping the $\rho$). The shape of the resulting mass spectrum exhibits considerable broadening, but essentially no shift in mass. The acceptance-corrected transverse-momentum spectra have a shape atypical for radial flow and show a significant mass dependence, pointing to different sources in different mass regions., Comment: 4 pages, 4 figures, Quark Matter 2006 conference proceedings
Published: 2006
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23. $\phi$ meson production in NA60

Author: P. Sonderegger, P. Martins, J. Lozano, Raphael Noel Tieulent, C. Cicalo, Hermine Katharina Wöhri, B. Chaurand, A. De Falco, Alessandro Ferretti, Hiroaki Ohnishi, P. Pillot, N. Guettet, S. Serci, S. Damjanovic, E. Radermacher, H. Gulkanian, Pietro Cortese, H. En'yo, A. Colla, Joao Seixas, M. Keil, H. J. Specht, K. Banicz, F. Manso, Carlos Lourenco, P. Ramalhete, Roberta Arnaldi, Laurent Ducroux, P. Parracho, Alberto Masoni, A. Drees, P. Force, G. L. Usai, A. Devaux, Rob Veenhof, A. Neves, R. Averbeck, L. Kluberg, P. Rosinsky, J. Castor, A. David, Ruben Shahoyan, Michele Floris, Chiara Oppedisano, A. Guichard, J. M. Heuser, Enrico Scomparin, A. Foerster, G. Puddu, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Istituto Nazionale di Fisica Nucleare, Sezione di Cagliari (INFN, Sezione di Cagliari), Istituto Nazionale di Fisica Nucleare (INFN), NA60, National Institute for Nuclear Physics (INFN), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Physics, Particle physics, 25.75.Nq, 25.75.-q, 25.75.Dw, 14.40.Cs, 12.38.Mh, Large Hadron Collider, Muon, Physics and Astronomy (miscellaneous), Meson, 010308 nuclear & particles physics, Nuclear Theory, Elementary particle, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, Quality (physics), 0103 physical sciences, Range (statistics), 010306 general physics, Nucleon, Nuclear Experiment, Engineering (miscellaneous), NA49 experiment
Abstract: NA60, presented by M. Floris; NA60 is a fixed-target experiment at the CERN SPS which measured dimuon production in nucleus–nucleus and proton–nucleus collisions. The experiment collected muon pair samples of unprecedented quality in heavy-ion experiments. This paper presents a high quality measurement of the pT distribution of the φ meson, covering a broad pT window. The data were collected in 2003 in In-In collisions at 158 GeV per nucleon. The results, presented as a function of centrality, were studied against several possible sources of systematic effects and proved to be fairly stable. We show that the inverse mT slope measured in In-In collisions, in the φ→μμ decay channel, depends significantly on the range used to perform the fit. When the fit is performed at low transverse momentum, the effective inverse slope increases from peripheral to central collisions, as measured by other experiments. We finally show that our measurement for In-In is compatible with the overall systematics of T slope versus mass, measured in different collision systems by the NA49 experiment.
Published: 2006
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24. Latest results from NA60

Author: A Förster, the NA60 Collaboration, R Arnaldi, R Averbeck, K Banicz, J Castor, B Chaurand, C Cicalò, A Colla, P Cortese, S Damjanovic, A David, A De Falco, A Devaux, A Drees, L Ducroux, H En'yo, J Fargeix, A Ferretti, M Floris, P Force, N Guettet, A Guichard, H Gulkanian, J M Heuser, M Keil, L Kluberg, C Lourenço, J Lozano, F Manso, A Masoni, P Martins, A Neves, H Ohnishi, C Oppedisano, P Parracho, Ph Pillot, G Puddu, E Radermacher, P Ramalhete, P Rosinsky, E Scomparin, J Seixas, S Serci, R Shahoyan, P Sonderegger, H J Specht, R Tieulent, G Usai, R Veenhof, H K Wöhri, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), NA60, Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Physics, Nuclear and High Energy Physics, Muon, 010308 nuclear & particles physics, Plane (geometry), Elliptic flow, FOS: Physical sciences, 01 natural sciences, Charged particle, Azimuth, Nuclear physics, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Physics - Experiment, Nuclear Experiment (nucl-ex), Invariant (mathematics), Nuclear Experiment, 010306 general physics, Nucleon, Saturation (chemistry)
Abstract: The NA60 experiment has measured the production of muon pairs and of charged particles in In+In collisions at a beam energy of 158 AGeV. For invariant dimuon masses below the phi the space-time averaged rho spectral function was isolated by a novel procedure. It shows a strong broadening but essentially no shift in mass. The production of J/psi was measured as a function of the collision centrality. As in previous experiments studying Pb+Pb collisions an anomalous supression is observed, setting in at approximately 90 participant nucleons. Using the charged particles the reaction plane was reconstructed. The elliptic flow of charged particles increases with pt showing a saturation for pt > 2GeV/c. For the first time azimuthal distributions for J/psi are shown., 9 pages, 11 figures, talk given at the conference "Strangeness in Quark Matter 2006 (SQM2006)", March 2006, Los Angeles, USA, accepted for publication in Journal of Physics G
Published: 2006
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25. Bottomonium and Drell-Yan production in p-A collisions at 450 GeV

Author: B. Alessandro, C. Alexa, R. Arnaldi, M. Atayan, S. Beolè, V. Boldea, P. Bordalo, G. Borges, J. Castor, B. Chaurand, B. Cheynis, E. Chiavassa, C. Cicalò, M.P. Comets, S. Constantinescu, P. Cortese, A. De Falco, N. De Marco, G. Dellacasa, A. Devaux, S. Dita, J. Fargeix, P. Force, M. Gallio, C. Gerschel, P. Giubellino, M.B. Golubeva, A. Grigoryan, J.Y. Grossiord, F.F. Guber, A. Guichard, H. Gulkanyan, M. Idzik, D. Jouan, T.L. Karavicheva, L. Kluberg, A.B. Kurepin, Y. Le Bornec, C. Lourenço, M. Mac Cormick, A. Marzari-Chiesa, M. Masera, A. Masoni, M. Monteno, A. Musso, P. Petiau, A. Piccotti, J.R. Pizzi, F. Prino, G. Puddu, C. Quintans, L. Ramello, S. Ramos, L. Riccati, H. Santos, P. Saturnini, E. Scomparin, S. Serci, R. Shahoyan, M. Sitta, P. Sonderegger, X. Tarrago, N.S. Topilskaya, G.L. Usai, E. Vercellin, N. Willis, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), ALICE, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), NA50, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL)
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Muon, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Nuclear Theory, FOS: Physical sciences, Drell–Yan process, chemistry.chemical_element, Tungsten, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), chemistry, 0103 physical sciences, Transverse momentum, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Incident energy, High Energy Physics::Experiment, Beryllium, 010306 general physics, Nuclear Experiment, Particle Physics - Experiment
Abstract: The NA50 Collaboration has measured heavy-quarkonium production in p-A collisions at 450 GeV incident energy (sqrt(s) = 29.1 GeV). We report here results on the production of the Upsilon states and of high-mass Drell-Yan muon pairs (m > 6 GeV). The cross-section at midrapidity and the A-dependence of the measured yields are determined and compared with the results of other fixed-target experiments and with the available theoretical estimates. Finally, we also address some issues concerning the transverse momentum distributions of the measured dimuons., 18 pages, 9 figures, to be published in Phys. Lett. B
Published: 2006
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26. First Measurement of the $\rho$ Spectral Function in High-Energy Nuclear Collisions

Author: M. Keil, Roberta Arnaldi, P. Force, A. Neves, A. Devaux, P. Pillot, H. J. Specht, S. Serci, P. Rosinsky, P. Parracho, K. Banicz, Hermine Katharina Wöhri, R. Averbeck, Laurent Ducroux, Raphael Noel Tieulent, B. Chaurand, Michele Floris, A. De Falco, Alberto Masoni, P. Ramalhete, G. Puddu, Chiara Oppedisano, Hiroaki Ohnishi, Joao Seixas, A. Förster, A. Colla, E. Radermacher, Alessandro Ferretti, Ruben Shahoyan, J. Fargeix, Andréia Márcia Santos de Souza David, H. Gulkanian, N. Guettet, Franck Manso, P. Martins, Enrico Scomparin, H. En'yo, J. Lozano, A. Drees, A. Guichard, G. L. Usai, L. Kluberg, J. M. Heuser, P. Sonderegger, S. Damjanovic, Pietro Cortese, Carlos Lourenco, J. Castor, Corrado Cicalo, Rob Veenhof, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), NA60, Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Particle physics, pion-pion interactions, Meson, 25.75.-q, 12.38.Mh, 13.85.Qk, Hadron, FOS: Physical sciences, General Physics and Astronomy, 7. Clean energy, 01 natural sciences, Nuclear physics, 0103 physical sciences, quantum chromodynamics, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Physics - Experiment, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Physics, Quantum chromodynamics, Annihilation, Muon, 010308 nuclear & particles physics, rho mesons, meson leptonic decay, Pair production, Quark–gluon plasma, Mass spectrum, heavy ion-nucleus reactions, High Energy Physics::Experiment
Abstract: We report on a precision measurement of low-mass muon pairs in 158 AGeV indium-indium collisions at the CERN SPS. A significant excess of pairs is observed above the yield expected from neutral meson decays. The unprecedented sample size of 360 000 dimuons and the good mass resolution of about 2% allow us to isolate the excess by subtraction of the decay sources. The shape of the resulting mass spectrum is consistent with a dominant contribution from pi+pi-->rho-->mu+mu- annihilation. The associated space-time averaged rho spectral function shows a strong broadening, but essentially no shift in mass. This may rule out theoretical models linking hadron masses We report on a precision measurement of low-mass muon pairs in 158 AGeV indium-indium collisions at the CERN SPS. A significant excess of pairs is observed above the yield expected from neutral meson decays. The unprecedented sample size of 360 000 dimuons and the good mass resolution of about 2% allow us to isolate the excess by subtraction of the decay sources. The shape of the resulting mass spectrum is consistent with a dominant contribution from pi+pi-->rho-->mu+mu- annihilation. The associated space-time averaged rho spectral function shows a strong broadening, but essentially no shift in mass. This may rule out theoretical models linking hadron masses
Published: 2006
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27. First measurement of the rho spectral function in nuclear collisions

Author: A. Neves, B. Chaurand, H. Gulkanian, L. Kluberg, K. Banicz, Alberto Masoni, N. Guettet, P. Ramalhete, H. En'yo, E. Radermacher, P. Rosinsky, A. De Falco, Pietro Cortese, H. J. Specht, S. Serci, P. Martins, A. Forster, Laurent Ducroux, A. Guichard, Alessandro Ferretti, Carlos Lourenco, Enrico Scomparin, A. Colla, G. Puddu, P. Force, A. Devaux, P. Sonderegger, S. Damjanovic, R. Averbeck, Raphael Noel Tieulent, J. M. Heuser, P. Parracho, F. Manso, J. Fargeix, A. Drees, G. L. Usai, J. Castor, Rob Veenhof, Hiroaki Ohnishi, Ruben Shahoyan, Michele Floris, A. David, Chiara Oppedisano, Hermine Katharina Wöhri, Joao Seixas, J. Lozano, Pillot Ph, C. Cicalo, M. Keil, Roberta Arnaldi, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Tamás Csörgő, Gábor Dávid, Péter Lévai and Gábor Papp, NA60, Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Nuclear and High Energy Physics, Particle physics, Physics and Astronomy (miscellaneous), Meson, Physics::Instrumentation and Detectors, Hadron, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Nuclear physics, 0103 physical sciences, Nuclear Physics - Experiment, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Engineering (miscellaneous), Physics, Muon, Annihilation, Large Hadron Collider, 010308 nuclear & particles physics, Yield (chemistry), Mass spectrum, High Energy Physics::Experiment, Spectral function
Abstract: The NA60 experiment at the CERN SPS has studied low-mass muon pairs in 158 AGeV In-In collisions. A strong excess of pairs is observed above the yield expected from neutral meson decays. The unprecedented sample size close to 400K events and the good mass resolution of about 2% made it possible to isolate the excess by subtraction of the decay sources. The shape of the resulting mass spectrum shows some non-trivial centrality dependence, but is largely consistent with a dominant contribution from pi+pi- ->rho ->mu+mu- annihilation. The associated rho spectral function exhibits considerable broadening, but essentially no shift in mass. The pT-differential mass spectra show the excess to be much stronger at low pT than at high pT. The results are compared to theoretical model predictions; they tend to rule out models linking hadron masses directly to the chiral condensate., 6 pages, 9 figures, To appear in the proceedings of Hot Quarks 2006, Villasimius, Italy, 15-20 May 2006
Published: 2005
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28. Dimuon and charm production in In-In collisions at the CERN SPS

Author: N. Guettet, K. Banicz, A. Colla, B. Chaurand, Enrico Scomparin, E. Radermacher, H. En'yo, M. Keil, J. Lozano, A. Förster, Alessandro Ferretti, H. J. Specht, Hermine Katharina Wöhri, P. Parracho, J. Castor, Alberto Masoni, A. Guichard, P. Ramalhete, Roberta Arnaldi, P. Rosinsky, A. Devaux, Hiroaki Ohnishi, J. M. Heuser, P. Force, S. Serci, R. Averbeck, A. Neves, P. Martins, Rob Veenhof, L. Kluberg, P. Sonderegger, G. Puddu, Joao Seixas, Pietro Cortese, Ruben Shahoyan, Raphael Noel Tieulent, Pillot Ph, Carlos Lourenco, Laurent Ducroux, A. De Falco, A. David, H. Gulkanian, C. Cicalo, S. Damjanovic, Michele Floris, Chiara Oppedisano, J Fargeix, A. Drees, G. L. Usai, F. Manso, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Tamás Csörgő, Gábor Dávid, Péter Lévai and Gábor Papp, NA60, Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, Muon, Large Hadron Collider, Meson, Proton, 010308 nuclear & particles physics, Nuclear Theory, 01 natural sciences, 7. Clean energy, Nuclear physics, Pair production, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Invariant mass, High Energy Physics::Experiment, Charm (quantum number), 010306 general physics, Nuclear Experiment
Abstract: The NA60 experiment studies muon pair production with proton and Indium beams. It is a second generation experiment, designed to answer specific questions left open, in the leptonic sector, by the previous round of SPS experiments, finished in 2000. The results presented in this paper cover the dimuon invariant mass range from the threshold to the J/ ψ . The main physics topics that we address include the in-medium modifications of the ρ meson, the origin of the dimuon excess observed between the ϕ and the J/ ψ , and the study of the anomalous J/ ψ suppression. For each of these subjects, the NA60 results represent a significant step forward towards a deeper understanding of the physics of heavy ion collisions at SPS energies.
Published: 2005
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29. Charm and intermediate mass dimuons in In+In collisions

Author: P. Ramalhete, J. Lozano, Raphael Noel Tieulent, Z. Li, Hiroaki Ohnishi, Brigitte Cheynis, Michele Floris, A. De Falco, Chiara Oppedisano, B. Chaurand, A. Neves, S. Serci, P. Sonderegger, L. Kluberg, P. Force, F. Manso, K. Banicz, A. David, Enrico Scomparin, E. Radermacher, W. Chen, Joao Seixas, N. Guettet, Laurent Ducroux, H. J. Specht, A. Guichard, N. De Marco, Rob Veenhof, A. Drees, G. L. Usai, Hermine Katharina Wöhri, A. Devaux, R. Averbeck, J. M. Heuser, P. Rosinsky, P. Parracho, R. Shaoyan, J. Castor, Pietro Cortese, Carlos Lourenco, H. Gulkanian, M. Kneil, P. Martins, P. Pillot, G. Puddu, A. Colla, Alberto Masoni, S. Damjanovic, C. Cicalo, Roberta Arnaldi, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Tamás Csörgő, Gábor Dávid, Péter Lévai and Gábor Papp, NA60, Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, 010308 nuclear & particles physics, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Open charm, 010306 general physics, 01 natural sciences, Production rate
Abstract: NA60; We present preliminary results on the production of intermediate mass dimuons in 158 Adot operatorGeV In-In collisions at the CERN SPS. NA38 and NA50 observed a strong excess in this region in S-U and Pb-Pb interactions with respect to the dimuon production rate expected from p-A data. Thanks to the use of a pixel vertex telescope, NA60 can separate the prompt dimuons from the pairs resulting from open charm decays and show that the excess dimuons are of prompt origin.
Published: 2005
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30. $\phi$ production in p-A and In-In collisions

Author: M. Keil, P. Parracho, Carlos Lourenco, Roberta Arnaldi, J. M. Heuser, Alberto Masoni, P. Rosinsky, Franck Manso, Enrico Scomparin, P. Pillot, H. J. Specht, Laurent Ducroux, G. Puddu, P. Force, P. Martins, A. Drees, A. Neves, Hermine Katharina Wöhri, A. Devaux, G. L. Usai, A. David, Alessandro De Falco, Ruben Shahoyan, B. Chaurand, P. Sonderegger, K. Banicz, R. Averbeck, S. Damjanovic, N. Guettet, J. Lozano, L. Kluberg, S. Serci, J. Castor, H. En'yo, A. Guichard, Corrado Cicalo, Michele Floris, A. De Falco, E. Radermacher, Chiara Oppedisano, A. Colla, H. Gulkanian, Alessandro Ferretti, Raphael Noel Tieulent, Rob Veenhof, P. Ramalhete, Joao Seixas, Hiroaki Ohnishi, Pietro Cortese, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Tamás Csörgő, Gábor Dávid, Péter Lévai and Gábor Papp, NA60, Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Meson production, Large Hadron Collider, 010308 nuclear & particles physics, Spectrum (functional analysis), Nuclear Theory, Inverse, 01 natural sciences, Nuclear physics, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Production (computer science), 010306 general physics, Nuclear Experiment
Abstract: NA60; The NA60 experiment studied phi meson production in p-A and In-In collisions at the CERN SPS. The ratio phi/ω shows an increase by a factor not, vert, similar2 from peripheral to central collisions. The inverse slope parameter T of the pT spectrum increases with centrality, and seems to agree with the previous NA49 measurements.
Published: 2005
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31. NA50 final results on charmonia suppression

Author: C Quintans, the Na50 Collaboration, B Alessandro, C Alexa, R Arnaldi, M Atayan, S Beolè, V Boldea, P Bordalo, G Borges, C Castanier, J Castor, B Chaurand, B Cheynis, E Chiavassa, C Cicalò, M P Comets, S Constantinescu, P Cortese, A De Falco, N De Marco, G Dellacasa, A Devaux, S Dita, J Fargeix, P Force, M Gallio, C Gerschel, P Giubellino, M B Golubeva, A A Grigoryan, S Grigoryan, F F Guber, A Guichard, H Gulkanyan, M Idzik, D Jouan, T L Karavicheva, L Kluberg, A B Kurepin, Y Le Bornec, C Lourenço, M Mac Cormick, A Marzari-Chiesa, M Masera, A Masoni, M Monteno, A Musso, P Petiau, A Piccotti, J R Pizzi, F Prino, G Puddu, L Ramello, S Ramos, L Riccati, H Santos, P Saturnini, E Scomparin, S Serci, R Shahoyan, F Sigaudo, M Sitta, P Sonderegger, X Tarrago, N S Topilskaya, G L Usai, E Vercellin, L Villatte, N Willis, T Wu, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), NA50, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear reaction, History, Meson, 010308 nuclear & particles physics, Hadron, Nuclear Theory, Elementary particle, Quarkonium, 01 natural sciences, Particle identification, Computer Science Applications, Education, Baryon, Nuclear physics, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Atomic physics, 010306 general physics, Nucleon, Nuclear Experiment
Abstract: NA50; The last results from the NA50 experiment on charmonia production in Pb-Pb interactions at 158 GeV/c per nucleon are presented. A strong J/$\psi$ suppression is observed, which increases with the centrality of the collisions. The J/$\psi$ production is seen to be anomalously suppressed starting at mid-centralities, when compared to a reference taken from proton-induced collisions. The most recent developments on the determination of this normal absorption curve are explained. It is also shown that for sulphur-induced reactions there is full agreement with the extrapolated normal p-A behaviour. The suppression of $\psi'$ production in heavy ion collisions (Pb-Pb and S-U) is also presented. It is seen to increase with the centrality of the collisions, and to be significantly stronger than the one measured in proton-induced reactions.
Published: 2005
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32. Charged particle multiplicity measurements in NA60

Author: Franck Manso, K. Banicz, J. Lozano, H. Vardanyan, A. De Falco, Z. Li, P. Pillot, S. Serci, A. Colla, Alessandro Ferretti, H. J. Specht, Corrado Cicalo, B. Chaurand, Michele Floris, G. Puddu, H. Gulkanian, Pietro Cortese, A. Guichard, P. Parracho, Chiara Oppedisano, P. Rosinsky, M. Keil, Carlos Lourenco, Roberta Arnaldi, Enrico Scomparin, A.A. Grigorian, K. Borer, P. Sonderegger, Jean-Yves Grossiord, Jan Buytaert, Brigitte Cheynis, E. Radermacher, S. Damjanovic, J. Castor, P. Force, A. David, P. Ramalhete, Ruben Shahoyan, Rob Veenhof, J. M. Heuser, E. Tveiten, J. Seixas, N. De Marco, Wen-Chang Chen, Hiroaki Ohnishi, A. Devaux, Raphael Noel Tieulent, Alberto Masoni, A. Neves, N. Guettet, H. En'yo, L. Kluberg, Hermine Katharina Wöhri, A. Drees, G. L. Usai, M. Floris, Laurent Ducroux, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), ALICE, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), NA60, Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)
Subjects: History, Particle physics, Silicon, Physics::Instrumentation and Detectors, Nuclear Theory, chemistry.chemical_element, 01 natural sciences, 7. Clean energy, Education, law.invention, Telescope, Nuclear physics, Muon spectrometer, law, 0103 physical sciences, Nuclear Experiment, 010303 astronomy & astrophysics, Physics, Large Hadron Collider, 010308 nuclear & particles physics, Detector, Multiplicity (mathematics), Charged particle, Computer Science Applications, Vertex (geometry), chemistry, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], High Energy Physics::Experiment
Abstract: NA60; The NA60 experiment at the CERN SPS studies dimuon production in nucleusnucleus and proton-nucleus collisions. One of the main detectors in the apparatus is the silicon pixel vertex telescope, which tracks charged particles in the target region. This detector complements the information from the muon spectrometer, improving the dimuon mass resolution and signal-to-noise ratio of the experiment, overcoming the main limitations of its predecessors. The silicon vertex telescope also provides the experiment with the capability of measuring charged particle multiplicities. In this paper we briefly describe the experiment and some preliminary results on charged particle multiplicities for two different colliding systems at different incident beam energies (Pb-Pb at 30 AGeV and In-In at 158 AGeV).
Published: 2005
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33. A new measurement of J/psi suppression in Pb-Pb collisions at 158 GeV per nucleon

Author: A. De Falco, A. Musso, Smbat Grigoryan, P. Saturnini, O. Drapier, A. Guichard, X. Tarrago, C. Castanier, P. Petiau, Ara Grigoryan, Roberta Arnaldi, Paolo Giubellino, M.P. Comets, M. Mac Cormick, Alexey Kurepin, T. Wu, L. Riccati, B. Chaurand, Mario Sitta, M. Masera, F.F. Guber, Bruno Alessandro, Tatiana Karavicheva, A. Marzari-Chiesa, C. Gerschel, S. Serci, Luciano Ramello, S. Ramos, P. Macciotta, Mauro Gallio, V. Boldea, J.-R. Pizzi, Enrico Scomparin, N. De Marco, M. Gonin, Alberto Masoni, A. Piccotti, H.R. Gulkanyan, P. Force, G. Borges, Helena Santos, Serban Constantinescu, Sanda Dita, D. Jouan, Marek Idzik, Pietro Cortese, S. Beole, G. Puddu, Ermanno Vercellin, P. Sonderegger, Carlos Lourenco, L. Kluberg, N.S. Topilskaya, E. Chiavassa, Ruben Shahoyan, F. Sigaudo, C. Quintans, M. Atayan, P. Bordalo, A. Devaux, G. L. Usai, J. Fargeix, Marco Monteno, Y. Le Bornec, J. Castor, Brigitte Cheynis, A. Romana, Calin Alexa, L. Villatte, Corrado Cicalo, F. Prino, N. Willis, G. Dellacasa, M.B. Golubeva, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), NA50, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, Nuclear Theory, Drell–Yan process, FOS: Physical sciences, Elementary particle, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Energy density, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), 010306 general physics, Nucleon, Absorption (electromagnetic radiation), Nuclear Experiment, Engineering (miscellaneous), Particle Physics - Experiment, Nuclear Physics
Abstract: We present a new measurement of J/psi production in Pb-Pb collisions at 158 GeV/nucleon, from the data sample collected in year 2000 by the NA50 Collaboration, under improved experimental conditions with respect to previous years. With the target system placed in vacuum, the setup was better adapted to study, in particular, the most peripheral nuclear collisions with unprecedented accuracy. The analysis of this data sample shows that the (J/psi)/Drell-Yan cross-sections ratio measured in the most peripheral Pb-Pb interactions is in good agreement with the nuclear absorption pattern extrapolated from the studies of proton-nucleus collisions. Furthermore, this new measurement confirms our previous observation that the (J/psi)/Drell-Yan cross-sections ratio departs from the normal nuclear absorption pattern for semi-central Pb-Pb collisions and that this ratio persistently decreases up to the most central collisions., 19 pages, 10 figures. Submitted to Eur. Phys. J. C
Published: 2004
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34. J/$\psi$ production and suppression at SPS energies

Author: Ermanno Vercellin, F. Sigaudo, Marco Monteno, G. Puddu, Y. Le Bornec, H.R. Gulkanyan, T. Wu, X. Tarrago, C. Castanier, Bruno Alessandro, G. L. Usai, G. Borges, J. Castor, T.L. Karavitcheva, Corrado Cicalo, Paolo Giubellino, F.F. Guber, A. Marzari-Chiesa, M. Mac Cormick, B. Chaurand, Roberta Arnaldi, N. Willis, A.A. Grigorian, A. Devaux, C. Gerschel, Alberto Masoni, Luciano Ramello, Brigitte Cheynis, M. P. Comets, A. Musso, Marek Idzik, Serban Constantinescu, Stefania Beole, P Cortese, S. Ramos, Mauro Gallio, P. Petiau, N. De Marco, S. Serci, V. Boldea, P. Force, J. Fargeix, Smbat Grigoryan, P. Sonderegger, Mario Sitta, L. Villatte, Calin Alexa, P. Bordalo, A. Piccotti, Massimo Masera, F. Prino, L. Riccati, M.B. Golubeva, Sanda Dita, D. Jouan, A. De Falco, E. Chiavassa, Ruben Shahoyan, P. Saturnini, Enrico Scomparin, G. Dellacasa, Helena Santos, A. Guichard, Alexey Kurepin, Carlos Lourenco, L. Kluberg, N.S. Topilskaya, J.-R. Pizzi, C. Quintans, M. Atayan, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), NA50, Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Proton, 010308 nuclear & particles physics, Absorption cross section, Nuclear matter, 01 natural sciences, 7. Clean energy, Ion, Momentum, Nuclear physics, Cross section (physics), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, 010306 general physics, Nucleon, Nuclear Experiment
Abstract: NA50; We present the set of measurements carried out by the NA50 experiment to study J$\psi$ production in proton- and ion-induced reactions. We also make use of results obtained previously under similar conditions by experiments NA51, NA38 and NA3. All these measurements were performed in fixed target experiments at the CERN SPS. Due to accelerator constraints, momentum was 450, 400 and 200 GeV/c for incident proton beams (corresponding to $\sqrt{s}$=29.0, 27.4, 19.4 GeV} respectively) whereas, for ion beams, incident momentum was 200 GeV/nucleon for oxygen and sulfur and 158 GeV/nucleon for Pb beams ($\sqrt{s}$=19.4 and $\sqrt{s}$=17.2 GeV} respectively). The p–A data allow us to determine with high accuracy the absorption cross section of the (pre-)resonant $c\bar{c}$ state with nuclear matter. The J$\psi$ production cross section normally expected for ion-induced reactions can then be determined and compared to the results obtained from the data collected for oxygen- and sulfur-induced collisions. Finally, we also present the most recent results on J$\psi$ production in Pb–Pb interactions. They are based on the last data sample collected with an improved experimental set-up and are compared with the expectations inferred from similar measurements on lighter nuclei collisions.
Published: 2004
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35. Transverse momentum dependence of charmonium suppression in Pb-Pb collisions at the CERN SPS

Author: A.B. Kurepin, B. Alessandro, C. Alexa, R. Arnaldi, M. Atayan, S. Beolè, V. Boldea, P. Bordalo, G. Borges, C. Castanier, J. Castor, B. Chaurand, B. Cheynis, E. Chiavassa, C. Cicalo, M.P. Comets, S. Constantinescu, P. Cortese, A. De Falco, N. De Marco, G. Dellacasa, A. Devaux, S. Dita, J. Fargeix, P. Force, M. Gallio, C. Gerschel, P. Giubellino, M.B. Golubeva, A.A. Grigorian, S. Grigorian, F.F. Guber, A. Guichard, H. Gulkanyan, M. Idzik, D. Jouan, T.L. Karavitcheva, L. Kluberg, Y. Le Bornec, C. Lourenço, M. Mac Cormick, A. Marzari-Chiesa, M. Masera, A. Masoni, M. Monteno, A. Musso, P. Petiau, A. Piccotti, J.R. Pizzi, F. Prino, G. Puddu, C. Quintans, L. Ramello, S. Ramos, L. Riccati, H. Santos, P. Saturnini, E. Scomparin, S. Serci, R. Shahoyan, F. Sigaudo, M. Sitta, P. Sonderegger, X. Tarrago, N.S. Topilskaya, G.L. Usai, E. Vercellin, L. Villatte, N. Willis, T. Wu, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), NA50, Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Physics, Nuclear and High Energy Physics, Range (particle radiation), Large Hadron Collider, 010308 nuclear & particles physics, 01 natural sciences, Nuclear physics, Cross section (physics), Amplitude, 0103 physical sciences, Transverse momentum, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Atomic physics, 010306 general physics, Nucleon, Nuclear Experiment
Abstract: Charmonium suppression in Pb-Pb collisions at 158 GeV/c per nucleon is investigated in detail with the study of the transverse momentum distributions of J/ ψ as a function of the centrality of the collision. It is shown that the observed J/ ψ suppression in Pb-Pb interactions is particularly significant mainly at low transverse momentum where it strongly depends on centrality. For peripheral Pb-Pb collisions, the transverse momentum dependence of the J/ ψ cross section is, as a function of centrality, qualitatively similar to the dependence observed in p-A and S-U collisions. Comparing peripheral and central Pb-Pb collisions, the data show a relative suppression in the whole p T range although its amplitude significantly decreases with increasing p T and becomes almost p T independent for the highest p T values.
Published: 2004
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36. Fission cross sections of lead projectiles in Pb-nucleus interactions at 40 and158GeV∕cper nucleon

Author: A. Piccotti, A. Baldit, G. Dellacasa, Mauro Gallio, V. Boldea, Paolo Giubellino, Helena Santos, P. Bordalo, Bruno Alessandro, Tatiana Karavicheva, L. Capelli, Mario Sitta, Chiara Oppedisano, A. Devaux, F.F. Guber, Brigitte Cheynis, X. Tarrago, C. Castanier, C. Baglin, Luciano Ramello, P. Rato Mendes, A. Bussiere, M. Masera, L. Riccati, R. Shahoian, Bruno Espagnon, N. Willis, B. Chaurand, C. Gerschel, P. Macciotta, S. Serci, L. Villatte, A. Musso, Smbat Grigoryan, A. Guichard, Ermanno Vercellin, Marek Idzik, J. Fargeix, Alessandro Ferretti, Roberta Arnaldi, M.B. Golubeva, A. Marzari-Chiesa, Enrico Scomparin, F. Sigaudo, Sanda Dita, D. Jouan, S. Ramos, M.P. Comets, N. De Marco, Enrico Scalas, E. Chiavassa, Marco Monteno, G. L. Usai, A. De Falco, H.R. Gulkanyan, Y. Le Bornec, P. Force, Alberto Masoni, P. Saturnini, Serban Constantinescu, Ara Grigoryan, M. Mac Cormick, M. Bedjidian, P. Sonderegger, Alexey Kurepin, G. Puddu, J. Castor, F. Prino, Corrado Cicalo, Calin Alexa, S. Beole, Pietro Cortese, L. Kluberg, N.S. Topilskaya, J.-R. Pizzi, C. Quintans, M. Atayan, and G. Borges
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, 0103 physical sciences, Claude bernard, 010306 general physics, 01 natural sciences, Humanities
Abstract: B. Alessandro, C. Alexa, R. Arnaldi, M. Atayan, C. Baglin, A. Baldit, M. Bedjidian, S. Beole, V. Boldea, P. Bordalo,* G. Borges, A. Bussiere, L. Capelli, C. Castanier, J. Castor, B. Chaurand, B. Cheynis, E. Chiavassa, C. Cicalo, M. P. Comets, S. Constantinescu, P. Cortese, G. Dellacasa, A. Devaux, A. De Falco, N. De Marco, S. Dita, B. Espagnon, J. Fargeix, A. Ferretti, P. Force, M. Gallio, C. Gerschel, P. Giubellino, M. B. Golubeva, A. A Grigoryan, S. Grigoryan, F. F. Guber, A. Guichard, H. Gulkanyan, M. Idzik, D. Jouan, T. L. Karavicheva, L. Kluberg, A. B. Kurepin, Y. Le Bornec, P. Macciotta, M. Mac Cormick, A. Marzari-Chiesa, M. Masera, A. Masoni, M. Monteno, A. Musso, C. Oppedisano, A. Piccotti, J. R. Pizzi, F. Prino, G. Puddu, C. Quintans, L. Ramello, S. Ramos,* P. Rato Mendes, L. Riccati, H. Santos, P. Saturnini, E. Scalas, E. Scomparin, S. Serci, R. Shahoian, F. Sigaudo, M. Sitta, P. Sonderegger,* X. Tarrago, N. S. Topilskaya, G. L. Usai, E. Vercellin, L. Villatte, and N. Willis (NA50 Collaboration) Dipartimento di Fisica Sperimentale, Universita di Torino and INFN-Torino, Torino, Italy IFA, Bucharest, Romania YerPhI, Yerevan, Armenia LAPP, CNRS-IN2P3, Annecy-le-Vieux, France LPC, Universite, Blaise Pascal and CNRS-IN2P3, Aubiere, France Institut de Physique Nucleaire de Lyon (IPNL), Universite, Claude Bernard, IN2P3-CNRS, Villeurbanne, France LIP, Lisbon, Portugal Laboratoire Leprince-Ringuet, Ecole Polytechnique and CNRS-IN2P3, Palaiseau, France Universita di Cagliari and INFN, Cagliari, Italy IPN, Universite, de Paris-Sud and CNRS-IN2P3, Orsay, France Universita del Piemonte Orientale, Alessandria and INFN, Alessandria, Italy INR, Moscow, Russia CERN, Geneva, Switzerland (Received 20 June 2003; published 12 March 2004)
Published: 2004
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37. The NA60 silicon pixel telescope

Author: H. Vardanyan, Enrico Scomparin, E. Radermacher, R. Shahoyan, Z. Li, P. Rosinsky, J. Seixas, A. De Falco, Alberto Masoni, Raphael Noel Tieulent, Pcf Parracho, Pietro Cortese, Brigitte Cheynis, Laurent Ducroux, Corrado Cicalo, Roberta Arnaldi, Wen-Chang Chen, Carlos Lourenco, Jan Buytaert, S. Serci, L. Kluberg, B. Chaurand, N. De Marco, A. Devaux, J. M. Heuser, A.A. Grigorian, J. Lozano, A. David, J. Castor, Hermine Katharina Wöhri, A. Neves, Markus Keil, A. Colla, Hiroaki Ohnishi, Alessandro Ferretti, A. Guichard, Michele Floris, Chiara Oppedisano, N. Guettet, P. Force, G. Puddu, K. Borer, R. Veenhof, A. Drees, G. L. Usai, H. En'yo, Franck Manso, K. Banicz, Jy Grossiord, H. Gulkanian, P. Sonderegger, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), ALICE, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Stephen J. Watts, NA60, Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear and High Energy Physics, Particle physics, Physics::Instrumentation and Detectors, Nuclear Theory, Radiation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, law.invention, Nuclear physics, Telescope, law, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Vector meson, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, Nuclear Experiment, Instrumentation, Physics, Large Hadron Collider, Pixel, 010308 nuclear & particles physics, Detector, Dipole, Thermal radiation, High Energy Physics::Experiment
Abstract: The NA60 experiment studies the production of open charm and prompt dimuons in proton–nucleus and nucleus–nucleus collisions at the CERN SPS. The main goal of NA60 is the study of various possible signatures of the transition from hadronic to deconfined partonic matter, e.g. anomalous charmonium suppression, dimuons from thermal radiation and modifications of vector meson properties. Reaching these goals is facilitated by the use of new state-of-the-art silicon detectors in the vertex region. Downstream of the target and inside a 2.5 T dipole magnetic field a pixel telescope measures the charged tracks originating from the collisions. The full pixel telescope consists of 16 planes with 96 ALICE1LHCb pixel detector assemblies in total. This paper describes the setup of the pixel telescope, results from tests as well as the expected implications of the operation of the silicon detectors in the harsh radiation environment of the NA60 experiment, with heavy-ion collisions.
Published: 2003
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38. The NA60 experiment at CERN SPS - First results and prospects

Author: J. Castor, N. De Marco, A. Neves, Markus Keil, Corrado Cicalo, A. Devaux, Z. Li, A. De Falco, A. Guichard, H. Gulkanian, P. Rosinsky, Michele Floris, A. Colla, S. Serci, Jan Buytaert, Alessandro Ferretti, H. Wo¨hri, A. Drees, P. Sonderegger, Chiara Oppedisano, K. Borer, Rob Veenhof, G. L. Usai, Roberta Arnaldi, H. Ohnishi, K. Banicz, Laurent Ducroux, W. Chen, N. Guettet, A.A. Grigorian, Raphael Noel Tieulent, Jean-Yves Grossiord, Brigitte Cheynis, B. Chaurand, P. Parracho, H. En'yo, Alberto Masoni, Ruben Shahoyan, Franck Manso, Pietro Cortese, Carlos Lourenco, L. Kluberg, A. David, H. Vardanyan, G. Puddu, J. Lozano, J. M. Heuser, Enrico Scomparin, Joao Seixas, E. Radermacher, P. Force, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), ALICE, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Yu. Oganessian, R. Kalpakchieva, NA60, Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear reaction, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Muon, Spectrometer, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Nuclear Theory, Detector, 01 natural sciences, Particle detector, law.invention, Semiconductor detector, Nuclear physics, Telescope, law, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics
Abstract: The NA60 experiment is taking place at the CERN SPS, to study the production of open charm and of prompt dimuons in collisions induced by proton and heavy ion beams on nuclear targets. In this paper we will present an overview of the detector concept, followed by a description of the newly developed silicon vertex telescope and its performance. Then we present some first results, including a dimuon mass spectrum obtained using the silicon vertex telescope.
Published: 2003
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39. The NA60 experiment: results and perspectives

Author: Hiroaki Ohnishi, Markus Keil, Franck Manso, J. Seixas, J.-Y. Grossiord, P. Parracho, Laurent Ducroux, Alessandro Ferretti, K. Banicz, C. Oppedisano, A. Neves, G. Puddu, Enrico Scomparin, Hermine Katharina Wöhri, S. Serci, A. Colla, A. Drees, K. Borer, P. Sonderegger, Michele Floris, G. L. Usai, B. Chaurand, C. Cicalo, A. De Falco, Pietro Cortese, P. Rosinsky, N. Guettet, Roberta Arnaldi, Wen-Chang Chen, J. M. Heuser, Carlos Lourenco, J. Lozano, L. Kluberg, Alberto Masoni, P. Force, H. Vardanyan, A. Devaux, Jan Buytaert, A. Guichard, E. Radermacher, Brigitte Cheynis, Z. Li, H. Gulkanian, A.A. Grigorian, A. David, Ruben Shahoyan, N. De Marco, Raphael Noel Tieulent, J. Castor, Rob Veenhof, H. En'yo, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), ALICE, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), NA60, Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL)
Subjects: Physics, Particle physics, Muon, Large Hadron Collider, Meson, Spectrometer, Interaction point, 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, Detector, Nuclear Theory, 01 natural sciences, 7. Clean energy, law.invention, Nuclear physics, Telescope, law, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Nucleon, Nuclear Experiment, Particle Physics - Experiment
Abstract: NA60; The NA60 experiment takes place at the SPS at CERN, to study the production of open charm and prompt dimuons in collisions induced by proton and heavy ion beams on nuclear targets. For this task, several novel detector systems were added to the dimuon spectrometer and zero-degree calorimeter, which were previously used in the NA50 experiment. The main upgrade is a new silicon pixel vertex spectrometer. It tracks the charged particles that are produced through the collisions in the target and allows us to match their trajectories and momenta with those of the muons that are measured behind the hadron absorber in the muon spectrometer. Besides improving considerably the dimuon mass resolution, the vertex telescope measures the offset of each muon track with respect to the interaction point. This allows us to select events where charm mesons were produced. We present in this article first results from dimuon data that were acquired in Summer 2002 with a 400 GeV proton beam. A silicon microstrip telescope was used at that time, since only a part of the pixel telescope was completed. The results include an improved dimuon mass resolution and an extended phase space coverage when compared with previous experiments. Data from Pb-Pb collisions at 20 and 30 GeV per nucleon were collected in October 2002 with three planes of pixel detectors. We show the very good accuracy with which we could reconstruct the interaction vertex. We conclude with a reminder of our physics programme and the ongoing completion of the pixel detector telescope for the Indium-Indium run at 158 GeV per nucleon, scheduled for September and October 2003.
Published: 2003
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40. Charmonia and Drell-Yan production in proton-nucleus collisions at the CERN SPS

Author: J.Y. Grossiord, Yu.K. Gavrilov, R. Arnaldi, E. Vercellin, R. Shahoyan, T. Claudino, Mario Sitta, C. Alexa, S. Constantinescu, S. Beolè, X. Tarrago, J. Fargeix, L Capelli, C. Lourenço, C. Baglin, A. Bussiere, N.S. Topilskaya, Laurent Ducroux, A. Marzari-Chiesa, Marco Monteno, P. Sonderegger, P. Rato Mendes, C. Quintans, M. Atayan, Paolo Giubellino, P. Macciotta, L. Kluberg, B. Chaurand, C. Gerschel, M. Mac Cormick, Pietro Cortese, L Villatte, J. Castor, N. Willis, Enrico Scomparin, G. Borges, S. Borenstein, C Castanier, T.L. Karavitcheva, João Cruz, S. Dita, S. Ramos, F Prino, L. Ramello, M. Gonin, G. Puddu, M. P. Comets, V. Boldea, E. Chiavassa, A. Piccotti, M.B. Golubeva, B. Espagnon, S. Grigorian, A.A. Grigorian, J.-R. Pizzi, W.L. Prado da Silva, F. Sigaudo, Y. Le Bornec, M. Gallio, A. Musso, P. Force, A. B. Kurepin, M. Masera, O. Drapier, P. Petiau, H. Gulkanyan, Enrico Scalas, Bruno Alessandro, F.F. Guber, N. De Marco, B. Cheynis, D. Jouan, G.L. Usai, N. Constans, P. Bordalo, R. Hakobyan, C. Cicalò, A. De Falco, L. Riccati, A. Devaux, P. Saturnini, S. Serci, Marek Idzik, G. Dellacasa, Helena Santos, A. Romana, A. Masoni, A. Guichard, Laboratoire d'Annecy de Physique des Particules (LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules), Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), ALICE, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), NA50, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Hadron, Nuclear Theory, Elementary particle, Nuclear matter, Quarkonium, 01 natural sciences, Baryon, Nuclear physics, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Nucleon, Nuclear Experiment, Glauber, Particle Physics - Experiment
Abstract: Charmonium production in p-A collisions is a unique tool for the study of the interaction of bound ccbar in nuclear matter. It can provide details on the basic features of the resonance formation mechanism and, in particular, on its non-perturbative aspects. In this Letter, we present an experimental study of Charmonia and Drell-Yan production in proton-nucleus collisions at 450GeV/c. The results are analyzed in the framework of the Glauber model and lead to the values of the nuclear absorption cross-section sigma^abs_pA for j/psi and psi'. Then, we compare the J/psi absorption in proton-nucleus and sulphur-uranium interactions, using NA38 data. We obtain that, for the J/psi, omega^abs_pA and omega^abs_SU are compatible, showing that no sizeable additional suppression mechanism in present S-U collisions, and confirming that the anomalous J/psi suppression only sets in for Pb-Pb interactions.
Published: 2003
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41. $\phi$ production in Pb-Pb collisions at 158 GeV/c per nucleon incident momentum

Author: V. Caponi, G. L. Usai, C. Quintans, M. Atayan, Mario Sitta, Sergio Serci, P. Rato Mendes, C. Baglin, B. Chaurand, J.-Y. Grossiord, C. Gerschel, Roberta Arnaldi, A. Baldit, P. Macciotta, N. Willis, Serban Constantinescu, A. Marzari-Chiesa, Y.K. Gavrilov, A. Masoni, N. Constans, S. Grigoryan, A. Devaux, A. Bussiere, Paolo Giubellino, Alexey Kurepin, B. Espagnon, P. Bordalo, J.-R. Pizzi, H.R. Gulkanyan, F.F. Guber, R. Hakobyan, A.A. Grigorian, Mauro Gallio, V. Boldea, X. Tarrago, Massimo Masera, O. Drapier, Marco Monteno, Y. Le Bornec, C. Castanier, Laurent Ducroux, Luciano Ramello, J. Astruc, E. Chiavassa, Ruben Shahoyan, J. Fargeix, Marek Idzik, A. Piccotti, L. Capelli, João Cruz, A. Guichard, M.B. Golubeva, J. Castor, G. Borges, Ermanno Vercellin, Corrado Cicalo, A. De Falco, T.L. Karavitcheva, N. De Marco, Sanda Dita, D. Jouan, T. Claudino, P. Saturnini, W.L. Prado da Silva, F. Sigaudo, Pietro Cortese, Enrico Scalas, L. Villatte, F Prino, Carlos Lourenco, L. Riccati, Enrico Scomparin, S. Silva, L. Kluberg, N.S. Topilskaya, M. Gonin, Brigitte Cheynis, I. Chevrot, A. Romana, Calin Alexa, S. Ramos, M. P. Comets, G. Dellacasa, Helena Santos, P. Petiau, P. Sonderegger, Bruno Alessandro, M. Mac Cormick, G. Puddu, Stefania Beole, P. Force, A. Musso, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), ALICE, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), NA50, Laboratoire d'Annecy de Physique des Particules (LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules), Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Muon, Meson, 010308 nuclear & particles physics, Nuclear Theory, Hadron, 16. Peace & justice, 01 natural sciences, Nuclear physics, Particle decay, Pair production, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], 0103 physical sciences, Transverse mass, High Energy Physics::Experiment, Rapidity, Nuclear Experiment, 010306 general physics, Nucleon
Abstract: The production of vector mesons φ , ρ and ω has been measured in Pb–Pb collisions at 158 GeV/ c per nucleon incident momentum at the CERN/SPS. The muon spectrometer of experiment NA50 detects φ , ρ and ω mesons via their μ + μ − decay channel in the collision center of mass rapidity range 0⩽ y CM ⩽1. The results reported here show that the relative production of the φ compared to the ( ρ + ω ) and the φ multiplicity per participant nucleon ( N part ) increase with the centrality of the collision. On the other hand, the ( ρ + ω ) multiplicity per participant does not exhibit any N part dependence within our errors. The inverse slope parameter as deduced from an exponential fit to the φ transverse mass distribution is 228±10 MeV. Our results are compared with those obtained by experiment NA49 and with theoretical calculations.
Published: 2003
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42. Scaling of charged particle multiplicity in Pb–Pb collisions at SPS energies

Author: Pietro Cortese, J.Y. Grossiord, Yu.K. Gavrilov, E. Vercellin, R. Arnaldi, M. Mac Cormick, Y. Le Bornec, A. Musso, P. Rato Mendes, A. Marzari-Chiesa, Marco Monteno, Bruno Alessandro, A. Romana, M. Masera, A. Masoni, B. Chaurand, P. Sonderegger, J. Castor, G.L. Usai, C. Gerschel, M.C. Abreu, Paolo Giubellino, G. Borges, T.L. Karavitcheva, L. Riccati, L. Villatte, I. Chevrot, S. Constantinescu, R. Haroutunian, V. Boldea, C. Quintans, M. Atayan, A. Baldit, X. Tarrago, C. Castanier, A. B. Kurepin, S. Serci, Mario Sitta, B. Espagnon, M. Gallio, P. Petiau, W.L. Prado da Silva, J.-R. Pizzi, A. Devaux, F. Sigaudo, S. Ramos, M. Bedjidian, L. Capelli, P. Force, C. Alexa, H. Gulkanyan, B. Cheynis, Enrico Scomparin, R. Shahoyan, N.S. Topilskaya, S. Grigorian, T. Claudino, Enrico Scalas, O. Drapier, C. Cicalò, S. Beolè, Laurent Ducroux, F.F. Guber, G. Puddu, G. Dellacasa, Helena Santos, L. Kluberg, A. De Falco, P. Saturnini, N. Willis, S. Dita, A. Piccotti, A.A. Grigorian, F. Prino, P. Bordalo, R. Hakobyan, M. P. Comets, Marek Idzik, L. Ramello, M. Gonin, M.B. Golubeva, J. Fargeix, A. Bussiere, A. Guichard, C. Lourenço, N. De Marco, D. Jouan, N. Constans, S. Silva, E. Chiavassa, C. Baglin, P. Macciotta, Laboratoire d'Annecy de Physique des Particules (LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules), Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), ALICE, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), NA50, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, 010308 nuclear & particles physics, Nuclear Theory, Binary number, 7. Clean energy, 01 natural sciences, Power law, Charged particle, Nuclear physics, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], 0103 physical sciences, High Energy Physics::Experiment, Impact parameter, Multiplicity (chemistry), 010306 general physics, Nucleon, Nuclear Experiment, Scaling, Particle Physics - Experiment
Abstract: The charged particle multiplicity distribution dN ch / dη has been measured by the NA50 experiment in Pb–Pb collisions at the CERN SPS. Measurements were done at incident energies of 40 and 158 GeV per nucleon over a broad impact parameter range. The multiplicity distributions are studied as a function of centrality using the number of participating nucleons ( N part ), or the number of binary nucleon–nucleon collisions ( N coll ). Their values at midrapidity exhibit a power law scaling behaviour given by N part 1.00 and N coll 0.75 at 158 GeV. Compatible results are found for the scaling behaviour at 40 GeV. The width of the dN ch / dη distributions is larger at 158 than at 40 GeV/nucleon and decreases slightly with centrality at both energies. Our results are compared to similar studies performed by other experiments both at the CERN SPS and at RHIC.
Published: 2002
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43. Pseudorapidity distributions of charged particles as a function of centrality in Pb–Pb collisions at 158 and 40 GeV per nucleon incident energy

Author: M. Bedjidian, S. Grigorian, Paolo Giubellino, P. Rato Mendes, H.R. Gulkanyan, A. Masoni, B. Espagnon, B. Chaurand, C. Gerschel, A. Bussiere, O. Drapier, M. Mac Cormick, A. De Falco, C. Quintans, M. Atayan, J.-R. Pizzi, Stefania Beole, P. Saturnini, M. P. Comets, G. Dellacasa, P. Force, Bruno Alessandro, G. Puddu, Laurent Ducroux, X. Tarrago, J.-Y. Grossiord, S. Silva, C. Castanier, Mario Sitta, Helena Santos, F.F. Guber, T. Claudino, M.B. Golubeva, P. Petiau, A. Musso, Ermanno Vercellin, Sergio Serci, Brigitte Cheynis, Pietro Cortese, A. Piccotti, W.L. Prado da Silva, F. Sigaudo, Luciano Ramello, Roberta Arnaldi, P. Sonderegger, F. Prino, P. Bordalo, R. Hakobyan, Massimo Masera, Carlos Lourenco, Enrico Scalas, L. Riccati, Enrico Scomparin, N. Willis, A. Marzari-Chiesa, Marco Monteno, Y. Le Bornec, J. Castor, L. Villatte, Corrado Cicalo, L. Kluberg, N.S. Topilskaya, A. Devaux, M. Gonin, I. Chevrot, A. Guichard, A.A. Grigorian, Y.K. Gavrilov, E. Chiavassa, Ruben Shahoyan, A. Romana, Alexey Kurepin, C. Baglin, Calin Alexa, S. Ramos, Sanda Dita, D. Jouan, A. Baldit, J. Fargeix, Serban Constantinescu, Marek Idzik, G. Borges, M.C. Abreu, Mauro Gallio, T.L. Karavitcheva, V. Boldea, N. De Marco, R. Haroutunian, N. Constans, L. Capelli, G. L. Usai, P. Macciotta, Laboratoire d'Annecy de Physique des Particules (LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules), Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), ALICE, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), NA50, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, Large Hadron Collider, 010308 nuclear & particles physics, Nuclear Theory, Function (mathematics), 01 natural sciences, 7. Clean energy, Charged particle, Nuclear physics, Transverse plane, Pseudorapidity, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], 0103 physical sciences, High Energy Physics::Experiment, Impact parameter, 010306 general physics, Nucleon, Nuclear Experiment, Particle Physics - Experiment
Abstract: The charged particle distributions dN ch / dη have been measured by the NA50 experiment in Pb–Pb collisions at the CERN SPS. Measurements have been done at incident energies of 158 and 40 GeV per nucleon over a broad impact parameter range. Results obtained with two independent centrality estimators, namely the neutral transverse energy E T and the forward energy E ZDC , are reported.
Published: 2002
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44. The dependence of the anomalous $J/\psi$ suppression on the number of participant nucleons

Author: S. Beolè, P. Rato Mendes, G. Puddu, F.F. Guber, J.Y. Grossiord, B. Chaurand, Yu.K. Gavrilov, A. Bussiere, Enrico Scomparin, A. De Falco, R. Arnaldi, Paolo Giubellino, C. Gerschel, A. B. Kurepin, B. Espagnon, G.L. Usai, F. Sigaudo, L. Riccati, A. Guichard, V. Boldea, C. Quintans, M. Atayan, Mario Sitta, N. Willis, N.S. Topilskaya, P. Saturnini, N. De Marco, B. Cheynis, D. Jouan, S. Constantinescu, S. Dita, X. Tarrago, Bruno Alessandro, C. Castanier, E Scalas, H Santos, L. Capelli, I. Chevrot, N. Constans, L. Ramello, C. Alexa, M. Gonin, M. P. Comets, S. Silva, J.-R. Pizzi, J. Fargeix, C. Cicalò, A. Piccotti, M.B. Golubeva, M. Bedjidian, C. Baglin, P. Sonderegger, G. Borges, Laurent Ducroux, P. Force, S. Grigorian, A. Baldit, P. Petiau, O. Drapier, S. Ramos, T.L. Karavitcheva, H. Gulkanyan, M. Gallio, A.A. Grigorian, F. Prino, Y. Le Bornec, A. Musso, P. Macciotta, R. Haroutunian, C. Lourenço, Pietro Cortese, E. Chiavassa, A. Devaux, M. Mac Cormick, S. Serci, G. Dellacasa, M. Masera, A. Romana, A. Masoni, M.C. Abreu, R. Shahoyan, T. Claudino, A. Marzari-Chiesa, Marco Monteno, P. Bordalo, R. Hakobyan, J. Castor, E. Vercellin, L. Villatte, L. Kluberg, Marek Idzik, Laboratoire d'Annecy de Physique des Particules (LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules), Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), ALICE, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), NA50, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)
Subjects: Deconfinement, Nuclear and High Energy Physics, Particle physics, Transverse energy, Hadron, Nuclear Theory, 158 Gev/C, Nucleus-nucleus collisions, 01 natural sciences, Nuclear physics, Cern-sps, 0103 physical sciences, 010306 general physics, Nuclear Experiment, Physics, Calorimeter (particle physics), Pattern, 010308 nuclear & particles physics, Zero (complex analysis), Function (mathematics), Pb-pb interactions, J-psi-suppression, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Quark–gluon plasma, High Energy Physics::Experiment, Nucleon, Glauber, Particle Physics - Experiment
Abstract: The observation of an anomalous J/psi suppression in Pb-Pb collisions by the NA50 Collaboration can be considered as the most striking indication for the deconfinement of quarks and gluons at SPS energies. In this Letter, we determine the J/psi suppression pattern as a function of the forward hadronic energy E-ZDC measured in a Zero Degree Calorimeter (ZDC). The direct connection between EZDC and the geometry of the collision allows us to calculate, within a Glauber approach, the precise relation between the number of participant nucleons N-part and E-ZDC. Then, we check if the experimental data can be better explained by a sudden or a smooth onset of the anomalous J/psi suppression as a function of the number of participants. (C) 2001 Elsevier Science B.V. All rights reserved. info:eu-repo/semantics/publishedVersion
Published: 2001
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45. Transverse momentum distributions of J/$\psi$, $\psi^{\prime}$, Drell-Yan and continuum dimuons produced in Pb-Pb interactions at the SPS

Author: G.L. Usai, L. Riccati, M. Gallio, J.Y. Grossiord, Yu.K. Gavrilov, L. Kluberg, R. Arnaldi, F Ohlson-Malek, F. Bellaiche, B. Cheynis, C. Cicalò, Mario Sitta, L. Villatte, C. Quintans, M. Atayan, S. Constantinescu, X. Tarrago, João Cruz, V. Boldea, M. P. Comets, I. Chevrot, G. Dellacasa, M. Mac Cormick, J. Fargeix, E. Chiavassa, C. Baglin, C. Alexa, A. Romana, A. Masoni, G. Puddu, Marek Idzik, P. Rato-Mendes, S. Beolè, Laurent Ducroux, A. Marzari-Chiesa, R. Shahoyan, P. Macciotta, S. Ramos, A. Baldit, Marco Monteno, L. Capelli, P. Bordalo, R. Hakobyan, A. De Falco, M.C. Abreu, A. Guichard, A. Devaux, S. Mourgues, B. Chaurand, I. Ropotar, C. Gerschel, P. Saturnini, P. Petiau, P. Force, J. Castor, P. Sonderegger, H. Gulkanyan, T.L. Karavitcheva, O. Drapier, A. Piccotti, E. Vercellin, A.A. Grigorian, F. Prino, R. Haroutunian, N. Willis, A. Bussiere, S. Dita, S Mehrabyan, F.F. Guber, B. Espagnon, Enrico Scomparin, C. Soave, A. B. Kurepin, L. Ramello, M. Gonin, M.B. Golubeva, C. Lourenço, Bruno Alessandro, M. Masera, T. Chambon, S. Serci, J.-R. Pizzi, N.S. Topilskaya, S. Silva, V. Capony, M. Bedjidian, Y. Le Bornec, A. Musso, L. Casagrande, N. De Marco, D. Jouan, N. Constans, Paolo Giubellino, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), ALICE, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), NA50, Laboratoire d'Annecy de Physique des Particules (LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules), Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL)
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Muon, Continuum (measurement), 010308 nuclear & particles physics, Nuclear Theory, Drell–Yan process, 01 natural sciences, Nuclear physics, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], 0103 physical sciences, Transverse momentum, High Energy Physics::Experiment, 010306 general physics, Nucleon, Nuclear Experiment, Particle Physics - Experiment
Abstract: Muon pairs produced in Pb-Pb interactions at 158~GeV/$c$ per nucleon are used to study the transverse momentum distributions of the J/$\psi$, $\psi^{\prime}$ and dimuons in the mass continuum. In particular, the dependence of these distributions on the centrality of the Pb-Pb collision is investigated in detail.
Published: 2000
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46. Evidence for deconfinement of quarks and gluons from the $J/psi$ suppression pattern measured in Pb-Pb collisions at the CERN-SPS

Author: A. Romana, A. Masoni, L. Villatte, G. Puddu, P. Bordalo, R. Hakobyan, Laurent Ducroux, C. Soave, A. Devaux, P. Force, M.C. Abreu, S. Constantinescu, X. Tarrago, L. Casagrande, B. Chaurand, A. Guichard, O. Drapier, C. Alexa, I. Chevrot, C. Gerschel, V. Boldea, A. Piccotti, M. Bedjidian, P. Petiau, H. Gulkanyan, M. P. Comets, A.A. Grigorian, J.-R. Pizzi, C. Lourenço, A. B. Kurepin, Marek Idzik, Paolo Giubellino, S. Beolè, G. Dellacasa, F. Prino, R. Shahoyan, S. Silva, L. Ramello, M. Gonin, N. De Marco, I. Ropotar, M.B. Golubeva, N. Willis, L. Kluberg, T.L. Karavitcheva, M. Monteno, S. Dita, M. Mac Cormick, S Mehrabyan, Bruno Alessandro, Enrico Scomparin, B. Espagnon, A. De Falco, B. Cheynis, A. Bussiere, S. Mourgues, L. Capelli, N.S. Topilskaya, F.F. Guber, D. Jouan, P. Saturnini, M. Gallio, P. Sonderegger, João Cruz, S. Ramos, R. Haroutunian, T. Chambon, Y. Le Bornec, A. Musso, G.L. Usai, L. Riccati, C. Cicalò, C. Quintans, M. Atayan, J.Y. Grossiord, Yu.K. Gavrilov, R. Arnaldi, J. Fargeix, N. Constans, A. Marzari-Chiesa, M. Sitta, J. Castor, S. Serci, A. Baldit, E. Vercellin, M. Masera, C. Baglin, P. Rato-Mendes, P. Macciotta, E. Chiavassa, Laboratoire d'Annecy de Physique des Particules (LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules), Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), ALICE, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), NA50, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, 010308 nuclear & particles physics, Hadron, Drell–Yan process, 01 natural sciences, Deconfinement, Nuclear physics, Strange matter, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], 0103 physical sciences, Quark–gluon plasma, High Energy Physics::Experiment, Color confinement, Nuclear Experiment, 010306 general physics, Particle Physics - Experiment, Production rate
Abstract: The analysis of the data collected by the NA50 experiment in 1998, reported in this paper, extends and clarifies the pattern of the previously observed J/$\psi$ anomalous suppression. This new measurement, besides providing a deeper understanding of the previous observations, reveals a steady significative decrease in the J/$\psi$ production rate up to the most central Pb-Pb collisions. It clearly rules out the presently available conventional (hadronic) models of J/$\psi$ suppression, which unanimously predict a saturation of the J/$\psi$ rate for central Pb-Pb collisions. On the contrary and together with the sharp onset of the anomalous suppression previously reported, the new observation leads to a global production rate pattern which finds its natural explanation in the framework of the formation of a deconfined state of quarks and gluons.
Published: 2000
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47. The elliptic flow of neutral transverse energy in heavy ion interactions at SPS energies

Author: P. Sonderegger, S. Filippov, F.F. Guber, Paolo Giubellino, Corrado Cicalo, M.C. Abreu, A. De Falco, T.L. Karavitcheva, Carlos Lourenco, S. Mourgues, Roberta Arnaldi, J. Astruc, R. Haroutunian, L. Kluberg, N.S. Topilskaya, V. Caponi, I. Ropotar, Stefania Beole, R. Shaboyan, François Fleuret, Y.K. Gavrilov, G. Dellacasa, O. Drapier, T. Chambon, Laurent Ducroux, P. Force, X. Tarrago, Ermanno Vercellin, C. Quintans, M. Atayan, N. Willis, A. Devaux, Massimo Masera, W.L. Prado da Silva, J.-R. Pizzi, L. Villatte, M. P. Comets, B. Chaurand, J.-Y. Grossiord, M. Mac Cormick, A. Guichard, L. Riccati, I. Chevrot, Mauro Gallio, A. Bussiere, V. Boldea, L. Ramello, João Cruz, C. Racca, B. Espagnon, C. Gerschel, G. Puddu, S. Ramos, F. Bellaiche, M.B. Golubeva, A. Marzari-Chiesa, Marco Monteno, E. Chiavassa, G. L. Usai, F. Ohlsson-Malek, Y. Le Bornec, C. Baglin, A. Romana, P. Rato-Mendes, J. Castor, P. Macciotta, J. Fargeix, Marek Idzik, L. Capelli, A.A. Grigorian, A. Piccotti, P. Bordalo, R. Hakobyan, M. Bedjidian, Pierre Saturnini, A. Musso, Sanda Dita, D. Jouan, A. Baldit, Serban Constantinescu, A. Masoni, N. Constans, Enrico Scomparin, Bruno Alessandro, M. Gonin, Calin Alexa, H.R. Gulkanyan, C. Soave, S. Mehrabyan, A. B. Kurepin, S. Silva, Brigitte Cheynis, Mario Sitta, L. Casagrande, Sergio Serci, N. De Marco, P. Petiau, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), ALICE, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), NA50, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Annecy de Physique des Particules (LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules), Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL)
Subjects: Physics, Nuclear and High Energy Physics, Phase transition, Meson, 010308 nuclear & particles physics, Elliptic flow, Hadron, Elementary particle, Kinetic energy, Quarkonium, 01 natural sciences, 7. Clean energy, Nuclear physics, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], 0103 physical sciences, Atomic physics, Impact parameter, Nuclear Experiment, 010306 general physics
Abstract: The threshold effect in the J/ψ suppression seen in the NA50 data in lead on lead interactions at the CERN SPS [1,2] can't be taken into account by conventional models. Other candidate models [3] use a phase transition, and therefore let suppose that the thermodynamic variables are defined everywhere that is the so-called thermalization. The in-plane elliptic flow, which has been proposed [4] in order to probe the thermalization at these beam energies, is found to be actually present in lead on lead interactions at 158A GeV/ c , but can't be observed in sulphur on sulphur at 200A GeV/ c in the NA38 data [5,6].
Published: 1999

48. J/$\psi$ and $\psi'$ production in p, O and S induced reactions at SPS energies

Author: S. Mourgues, L. Fredj, S. Papillon, P. Sonderegger, Ph. Gorodetzky, A. Bohrani, Bruno Espagnon, S. Silva, P. Saturnini, T. Chambon, B. Chaurand, X. Tarrago, C. Gerschel, R. Kossakowski, A. Bussiere, J. Fargeix, B. Ronceux, R. Ferreira, Carlos Lourenco, L. Kluberg, J.-R. Pizzi, M. Bedjidian, Claude Charlot, J.-Y. Grossiord, A. Baldit, A. Romana, Didier Contardo, Francois Vazeille, F. Ohlsson-Malek, M.C. Abreu, L. Luquin, E. Descroix, P. Bordalo, A. Devaux, O. Drapier, A. Guichard, R. Haroutunian, D. Jouan, G. Landaud, I. Chevrot, J. Castor, J. Astruc, J.M. Gago, C. Racca, S. Ramos, R. Mandry, C. Baglin, J.P. Guillaud, Philippe Busson, P. Force, Joao Varela, François Fleuret, Laboratoire d'Annecy de Physique des Particules (LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules), Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), ALICE, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), NA38, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, Large Hadron Collider, Proton, 010308 nuclear & particles physics, Dictionnaries, Nuclear Theory, targeted markup XML, API DOM, 7. Clean energy, 01 natural sciences, Ion, Nuclear physics, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], 0103 physical sciences, ComputingMethodologies_DOCUMENTANDTEXTPROCESSING, Encyclopedia, High Energy Physics::Experiment, Atomic physics, 010306 general physics, Nucleon, Nuclear Experiment, Particle Physics - Experiment, C++
Abstract: The production of the \jpsi\ and \psip\ charmonia states has been studied, through their dimuon decay, in proton, Oxygen and Sulphur induced reactions, by the NA38 experiment at the CERN SPS. The proton data was collected with beams of 200 and 450~GeV, while the ion beams had an energy of 200~GeV per incident nucleon. The \jpsi\ production cross-section per nucleon-nucleon collision exhibits a remarkably continuous pattern, as a function of the product of the mass numbers of the interacting nuclei, from pp up to S-U reactions. The same pattern is observed within S-U collisions, as a function of the collision centrality. While in p-A interactions both charmonia states exhibit the same A-dependence, in \mbox{S-U} collisions the \psip\ production is very strongly suppressed.
Published: 1999
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49. J/$\psi$, $\psi'$ and Drell-Yan production in S-U interactions at 200 GeV per nucleon

Author: J.-R. Pizzi, X. Tarrago, F. Ohlsson-Malek, C. Gerschel, R. Ferreira, A. Devaux, B. Espagnon, C. Baglin, M. Bedjidian, E. Descroix, A. Romana, P. Sonderegger, Ph. Gorodetzky, S. Silva, J.M. Gago, S. Papillon, Carlos Lourenco, R. Mandry, Joao Varela, L. Kluberg, J. Castor, O. Drapier, J. Astruc, B. Ronceux, S. Ramos, Claude Charlot, M.C. Abreu, Didier Contardo, L. Luquin, G. Landaud, François Fleuret, C. Racca, R. Kossakowski, S. Mourgues, A. Guichard, Philippe Busson, A. Baldit, J.P. Guillaud, T. Chambon, P. Force, P. Saturnini, D. Jouan, A. Bussière, B. Chaurand, A. Bohrani, R. Haroutunian, I. Chevrot, J. Fargeix, P. Bordalo, J.-Y. Grossiord, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Annecy de Physique des Particules (LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules), Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), ALICE, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), NA38, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Nuclear Theory, chemistry.chemical_element, Drell–Yan process, Uranium, 01 natural sciences, Nuclear physics, chemistry, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], 0103 physical sciences, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, 010306 general physics, Nucleon, Particle Physics - Experiment
Abstract: A detailed study of J/ ψ , ψ ′ and Drell-Yan production in S-U collisions has been performed by experiment NA38 at the CERN SPS. This paper presents production cross sections and their centrality dependence, based on the largest sample of S-U events collected by the experiment.
Published: 1999
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50. Observation of fission in Pb-Pb interactions at 158A GeV

Author: A. Romana, Calin Alexa, Ermanno Vercellin, J.-R. Pizzi, L. Bardi, W.L. Prado da Silva, I. Chevrot, G. Landaud, F. Ohlsson-Malek, G. L. Usai, A. Defalco, Marco Monteno, Y. Lebornec, A. Piccotti, G. Dellacasa, H.R. Gulkanyan, C. Soave, Paolo Giubellino, Mauro Gallio, V. Boldea, L. Casagrande, S. Silva, J.-Y. Grossiord, C. Vale, A. Baldit, Brigitte Cheynis, Alberto Masoni, N. Willis, S. Mourgues, E. Chiavassa, Marek Idzik, G. Puddu, Bruno Alessandro, M. Masera, Ruben Shahoyan, S. Mehrabyan, T. Chambon, S. Serci, M.P. Comets, B. Espagnon, Pietro Cortese, A. Marzari-Chiesa, A. Guichard, Roberta Arnaldi, S. Ramos, X. Tarrago, F. Bellaiche, João Cruz, Y.K. Gavrilov, J. Castor, Corrado Cicalo, Alexey Kurepin, Sanda Dita, D. Jouan, O. Drapier, P. Petiau, Enrico Scomparin, C. Baglin, L. Luquin, Mario Sitta, M. Gonin, S. Beole, P. Rato-Mendes, I. Ropotar, M. Maccormick, Carlos Lourenco, A.A. Grigorian, P. Sonderegger, A. Bussiere, P. Saturnini, L. Kluberg, N.S. Topilskaya, R. Haroutunian, M.C. Abreu, L. Riccati, T.L. Karavitcheva, P. Force, J. Fargeix, M. Bedjidian, M.B. Golubeva, C. Quintans, M. Atayan, C. Racca, François Fleuret, P. Bordalo, R. Hakobyan, Serban Constantinescu, A. Devaux, A. Musso, F.F. Guber, M. P. Macciotta, Luciano Ramello, B. Chaurand, J. Astruc, C. Gerschel, and N DeMarco
Subjects: Physics, Nuclear and High Energy Physics, Cluster decay, Large Hadron Collider, 010308 nuclear & particles physics, Fission, Nuclear Theory, Detector, Charge (physics), 01 natural sciences, Calorimeter, Nuclear physics, Yield (chemistry), 0103 physical sciences, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, 010306 general physics, Beam (structure)
Abstract: The NA50 experiment at the CERN SPS has been equipped with a Cerenkov quartz detector to measure the charge of projectilelike fragments emitted in interactions of the lead beam of $158A \mathrm{GeV}$ with a 12 mm thick lead target. A clear fission peak has been observed in the light output distribution of the fragment detector and the measured number of fission events per incident Pb ion is $(1.26\ifmmode\pm\else\textpm\fi{}0.16)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}2}.$ The information provided by the NA50 zero-degree calorimeter has allowed us to check that fission occurs in extremely peripheral collisions. To provide the first information about the fission mechanism, the expected yield of electromagnetic fission events in our experimental conditions has been computed: it turns out to be about $40%$ smaller than the observed one. The approximations necessarily made in our calculation as well as the contribution due to fission induced by nuclear interaction could account for such a difference.
Published: 1999

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