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151 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. 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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3. 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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4. 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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5. 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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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. First results and future perspectives of the NA60 experiment

Author: C Oppedisano, (for the NA60 Collaboration), R Arnaldi, K Banicz, K Borer, J Buytaert, J Castor, B Chaurand, W Chen, B Cheynis, C Cicalo, A Colla, P Cortese, A David, A de Falco, N de Marco, A Devaux, A Drees, L Ducroux, H En'yo, A Ferretti, M Floris, P Force, A Grigorian, J-Y Grossiord, N Guettet, A Guichard, H Gulkanian, J Heuser, M Keil, L Kluberg, Z Li, C Lourenço, J Lozano, F Manso, A Masoni, A Neves, H Ohnishi, G Puddu, E Radermacher, P Rosinsky, E Scomparin, J Seixas, S Serci, R Shahoyan, P Sonderegger, G Usai, H Vardanyan, and H Wöhri
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Muon, Large Hadron Collider, Meson, Spectrometer, Physics::Instrumentation and Detectors, Particle identification, Charged particle, Nuclear physics, Pseudorapidity, High Energy Physics::Experiment, Nuclear Experiment, Lepton
Abstract: The NA60 experiment at the CERN SPS studies the production of open charm and prompt dimuons in collisions induced by proton and heavy ion beams on nuclear targets. The experimental setup includes a silicon vertex telescope, placed inside a dipole magnetic field, to match charged particle tracks with the muon tracks measured by a muon spectrometer. In p-A collisions the vertex telescope is mostly made of silicon microstrip planes, whereas in A-A interactions the higher multiplicity imposes the use of high granularity silicon pixel detectors. The high interaction rate required for the study of rare processes imposes the use of radiation tolerant pixel detectors. NA60 took its first data in the year 2002, with 400 GeV protons and with Pb ions of 20 and 30 GeV per nucleon. The proton data have been used for the study of dimuon production, while the heavy ion data were devoted to the commissioning of the pixel detectors and to the study of charged particle pseudorapidity densities. After an overview of the detector concept, this paper presents the first results obtained with the 2002 data.
Published: 2003
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12. Pseudorapidity distributions of charged particles in Pb-Pb collisions at super proton synchrotron energies from the NA50 experiment

Author: T. Claudino, J.-Y. Grossiord, Mario Sitta, Paolo Giubellino, Y.K. Gavrilov, Sergio Serci, M. Idzik, B. Espagnon, X. Tarrago, C. Castanier, Bruno Alessandro, Alexey Kurepin, A. Piccotti, G. Dellacasa, A. Baldit, Serban Constantinescu, Helena Santos, M. Masera, M. P. Comets, F. Prino, M. Mac Cormick, L. Villatte, Roberta Arnaldi, A.A. Grigorian, L. Riccati, A. Romana, Corrado Cicalo, I. Chevrot, A. De Falco, P. Bordalo, R. Hakobyan, J. Fargeix, Ermanno Vercellin, A. Bussiere, N. De Marco, S. Ramos, Stefania Beole, P. Saturnini, W.L. Prado da Silva, Calin Alexa, F. Sigaudo, O. Drapier, R. Haroutunian, M. C. Abreu, Giulio Usai, N. Willis, A. Masoni, M.B. Golubeva, A. Devaux, P. Force, G. Puddu, A. Guichard, C. Quintans, N. Constans, M. Atayan, Enrico Scalas, S. Silva, M. Bedjidian, Brigitte Cheynis, Pietro Cortese, E. Scomparin, G. Borges, T.L. Karavitcheva, S. Grigorian, P. Petiau, Carlos Lourenco, L. Kluberg, N.S. Topilskaya, P. Sonderegger, J.-R. Pizzi, Y. Le Bornee, Marek Idzik, A. Musso, Sanda Dita, D. Jouan, M. Gonin, H.R. Gulkanyan, Mauro Gallio, V. Boldea, L. Capelli, F.F. Guber, Luciano Ramello, P. Rato Mendes, B. Chaurand, C. Gerschel, Laurent Ducroux, C. Baglin, P. Macciotta, E. Chiavassa, Ruben Shahoyan, A. Marzari-Chiesa, Marco Monteno, and J. Castor
Subjects: Physics, Particle physics, Large Hadron Collider, Nuclear Theory, General Physics and Astronomy, Super Proton Synchrotron, Charged particle, Nuclear physics, Pseudorapidity, High Energy Physics::Experiment, Multiplicity (chemistry), Impact parameter, Nuclear Experiment, Nucleon
Abstract: We present the measurements of charged particle pseudorapidity distributions dNch/dη performed by the NA50 experiment in Pb-Pb collisions at the CERN SPS. Measurements were done at incident energies of 40 GeV (√s = 8.77 GeV) and 158 GeV (√s = 17.3 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 (Ncoll). Their values at midrapidity exhibit a linear scaling withN part at both energies. Particle yield increases approximately by a factor of 2 betweeny √s = 8.77 GeV and √s = 17.3 GeV.
Published: 2003
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13. Results on leptonic probes from NA50

Author: R. Haroutunian, M. Mac Cormick, Pietro Cortese, A. Bussiere, N. Willis, G. Puddu, S. Dita, E. Vercellin, J.Y. Grossiord, Yu.K. Gavrilov, A. B. Kurepin, S. Constantinescu, S. Ramos, A. Romana, X. Tarrago, Paolo Giubellino, A. Masoni, C. Castanier, B. Cheynis, R. Arnaldi, M. Bedjidian, O. Drapier, Mario Sitta, S. Grigorian, S. Borenstein, C. Cicalò, F.F. Guber, Enrico Scomparin, G. Borges, T.L. Karavitcheva, C. Alexa, L. Villatte, Y. Le Bornec, V. Boldea, P. Rato Mendes, W. L. Prado Da Silva, A. Musso, P. Bordalo, B. Espagnon, A. Marzari-Chiesa, C. Lourenço, M. Gallio, Marco Monteno, C. Quintans, M. Atayan, R. Hakobyan, L. Ramello, M. Gonin, M. P. Comets, L. Capelli, B. Chaurand, M. Masera, S. Beolè, M.B. Golubeva, A. Guichard, J.-R. Pizzi, C. Gerschel, P. Force, P. Sonderegger, J. Castor, L. Riccatoi, P. Petiau, G. Dellacasa, H. Gulkanyan, Helena Santos, E. Chiavassa, Marek Idzik, F. Sigaudo, Bruno Alessandro, C. Baglin, S. Serci, N DeMarco, G.L. Usai, L. Kluberg, N.S. Topilskaya, Enrico Scalas, A. Defalco, P. Macciotta, A. Baldit, João Cruz, J. Fargeix, A. Piccotti, A.A. Grigorian, F. Prino, D. Jouan, P. Saturnini, A. Devaux, T. Wu, R. Shahoyan, and T. Claudino
Subjects: Physics, Nuclear and High Energy Physics, Stereochemistry
Abstract: L. Ramello’) for the NA50 Collaboration: B. Alessandro”), C. Alexa4), R. Arnaldi”), M. Atayanr3), C. Baglin2), A. Baldit3), M. Bedjidian12), S. Beolk”), V. Boldea4), P. Bordalo?+), S.R. Borensteinr”lb), G. Borges 7), A. Bussiitre2), L. Cape111 ‘ 2), C. Castanier3), J. Castor3), B. Chaurand’“), B. Cheynis rz), E. Chiavassa”), C. Cicalb5), T. Claudino7) M P Cometsg), . . S. Constantinescu4), P. Cortese’), J. Cruz’I), A. DeFalco”): N. DeMarco’l), G. Dellacasa’), A. Devaux3), S. Dita4), 0. Drapier’O), B. Espagnon3), J. Fargeix3), P. Force3), M. Gallio”), Y.K. Gavrilovs), C. Gerschelg), P. Giubellino”“), MB. Golubeva@, M. Gonin”), A.A. Grigorian13), S. Grigorian13), J.Y. Grossiord12), F.F. Guber’), A. Guichard12), H. Gulkanyani3), R. Hakobyan13), R. Haroutunian12), M. Idzik”Td), D. Jouan’), T.L. Karavitcheva 8), L. Kluberg “1, A.B. Kurepin 8), Y. Le Bornecg), C. Lourenco 6), P. Macciotta5), M. Mac Cormickg), A. Marzari-Chiesa’*), M. Maserall), A. Mssoni 5), M. Monteno”), A. Mussoll), P. Petiaul”), A. Piccotti”), J R Pizzi12) . . W L Prado da Silva’r”) F. Prino L. Ramello’f, S. . . 11), G. Puddu5), C. Quintans’), Ramos 7+), P. Rato Mendes7), L. Riccati *l), A. RomanalO), H. Santos’) P. Saturnini3), E. Scalas’) E. Scomparin 11), S. Serci5), R. Shahoyan7yf), F. Sigaudo”), M. Sitta’), P. Sonderegge#+), X. Tarragog), N.S. Topilskaya’), G.L. Usai51, E. Vercellin”), L. Villatteg), N. Willisg), T. Wug).
Published: 2003
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14. $\phi$ and $\rho$ $plus$ $\omega$ vector-mesons produced in lead-induced collisions

Author: P. Rato Mendes, B. Chaurand, S R Borenstein, Mauro Gallio, V. Boldea, C. Gerschel, Mario Sitta, H.R. Gulkanyan, J. Fargeix, Sergio Serci, M. P. Comets, A. Masoni, Ermanno Vercellin, Enrico Scomparin, M. Gonin, S. Ramos, A. Baldit, A. Romana, Y Le Bornec, Calin Alexa, L. Ramello, W.L. Prado da Silva, P. Petiau, Roberta Arnaldi, F. Sigaudo, G. Puddu, P. Sonderegger, Paolo Giubellino, Bruno Alessandro, L. Riccati, N. De Marco, E Scalas, A. De Falco, Sanda Dita, D. Jouan, C Castanier, A. Bussiere, G. Borges, M.C. Abreu, C. Quintans, A. Guichard, T.L. Karavitcheva, M. Atayan, P. Saturnini, Serban Constantinescu, N. Constans, Y.K. Gavrilov, B. Espagnon, M.B. Golubeva, A. Piccotti, J.-R. Pizzi, Alexey Kurepin, A.A. Grigorian, L. Villatte, João Cruz, S. Silva, F. Prino, Jean-Yves Grossiord, M Bedjidian, N. Willis, L Capelli, G. L. Usai, A. Musso, Brigitte Cheynis, Pietro Cortese, Carlos Lourenco, L. Kluberg, N.S. Topilskaya, Stefania Beole, A. Marzari-Chiesa, Marco Monteno, P. Force, M. Mac Cormick, J. Castor, Corrado Cicalo, S. Grigorian, X. Tarrago, T. Claudino, Massimo Masera, E. Chiavassa, Ruben Shahoyan, C. Baglin, R Haroutunian, G. Dellacasa, Helena Santos, P. Macciotta, O Drapier, P. Bordalo, R. Hakobyan, A. Devaux, Marek Idzik, and F.F. Guber
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Proton, Meson, Strangeness production, Inverse, Heavy ion, Nuclear Experiment, Omega, Scaling, Ion
Abstract: The experiment NA50 studies the strangeness production by means of the BRμμσ/(BRρμμσρ + BRωμμσω) cross-sections ratio in relativistic heavy ion collisions with respect to proton and light ion collisions. New results for Pb+Pb interactions at 158 A GeV/c are presented (1998 data) and analysed with a different method. The BRμμσ/(BRρμμσρ + BRωμμσω) ratio shows an increase with the number of participants, in agreement with previous results. The inverse slope parameter extracted from the MT universal scaling is also studied.
Published: 2002
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15. Strangeness measurements in NA50 experiment with Pb projectiles

Author: X. Tarrago, Mario Sitta, A. Romana, Sergio Serci, Calin Alexa, A. Bussiere, Mauro Gallio, V. Boldea, O. Drapier, J. Astruc, J.-Y. Grossiord, L. Riccati, Ermanno Vercellin, W.L. Prado da Silva, N. Constans, H.R. Gulkanyan, Paolo Giubellino, C. Soave, A. Piccotti, M. Bedjidian, I. Chevrot, L. Capelli, A. Masoni, P. Petiau, B. Espagnon, S. Silva, M.B. Golubeva, F. Ohlsson-Malek, T. Chambon, N. Willis, A. Marzari-Chiesa, A. Devaux, S. Mehrabyan, A.A. Grigorian, J. Fargeix, S. Mourgues, Roberta Arnaldi, P. Sonderegger, Marco Monteno, Laurent Ducroux, J.-R. Pizzi, Marek Idzik, João Cruz, Massimo Masera, Brigitte Cheynis, S. Ramos, L. Casagrande, Enrico Scomparin, S. Filippov, Y. Le Bornec, M. Gonin, E. Chiavassa, Bruno Alessandro, I. Ropotar, A. Guichard, F.F. Guber, G. L. Usai, B. Chaurand, Ruben Shahoyan, Luciano Ramello, M.C. Abreu, P. Bordalo, C. Gerschel, R. Hakobyan, T.L. Karavitcheva, A. De Falco, N. De Marco, G. Dellacasa, R. Haroutunian, P. Saturnini, Serban Constantinescu, A. Musso, F. Bellaiche, J. Castor, François Fleuret, Corrado Cicalo, C. Baglin, Y.K. Gavrilov, P. Rato-Mendes, P. Macciotta, Carlos Lourenco, Alexey Kurepin, L. Kluberg, L. Villatte, N.S. Topilskaya, C. Racca, V. Caponi, C. Quintans, M. Atayan, M. P. Comets, A. Baldit, Sanda Dita, D. Jouan, G. Puddu, S. Beole, M. Mac Cormick, and P. Force
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Transverse plane, Particle physics, Projectile, Transverse mass, Strangeness, Low Mass
Abstract: Low mass dimuons production has been studied in Pb-Pb collisions at 158 GeV/A . φ, ρ and ω contributions are extracted in different transverse mass and transverse energy domains. Preliminary results of the 1996 run display an increase of the φ/(ρ+ω) ratio, coming from an increase of the φ. Cross sections are presented and temperatures extracted.
Published: 2000
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16. Charmonium production in Pb−Pb collisions

Author: Corrado Cicalo, P. Petiau, R. Haroutunian, P. Sonderegger, Mario Sitta, Sergio Serci, S. Filippov, P. Bordalo, A. Marzari-Chiesa, B. Espagnon, R. Hakobyan, M. Mac Cormick, Marco Monteno, Y. Le Bornec, Bruno Alessandro, I. Ropotar, Paolo Giubellino, J. Castor, Stefania Beole, A. Masoni, M. P. Comets, P. Force, M.C. Abreu, Ermanno Vercellin, F. Bellaiche, T.L. Karavitcheva, Luciano Ramello, Marek Idzik, L. Villatte, J. Astruc, F. Guber, N. Willis, François Fleuret, A. Devaux, C. Racca, W.L. Prado da Silva, A.A. Grigorian, Carlos Lourenco, L. Kluberg, N.S. Topilskaya, A. Romana, Massimo Masera, Sanda Dita, S. Silva, J.-R. Pizzi, D. Jouan, T. Chambon, X. Tarrago, G. Dellacasa, Brigitte Cheynis, Calin Alexa, E. Chiavassa, Ruben Shahoyan, V. Caponi, A. Piccotti, C. Baglin, C. Quintans, M. Atayan, A. Baldit, P. Rato-Mendes, Serban Constantinescu, M. Bedjidian, H.R. Gulkanyan, L. Riccati, C. Soave, I. Chevrot, O. Drapier, A. Musso, P. Macciotta, A. De Falco, S. Ramos, S. Mehrabyan, P. Saturnini, A. B. Kurepin, Mauro Gallio, V. Boldea, Enrico Scomparin, M. B. Golubeva, M. Gonin, L. Capelli, S. Mourgues, Roberta Arnaldi, J.-Y. Grossiord, A. Bussiere, Laurent Ducroux, Nora De Marco, Y.K. Gavrilov, B. Chaurand, F. Ohlsson-Malek, C. Gerschel, L. Casagrande, A. Guichard, N. De Marco, G. L. Usai, J. Fargeix, N. Constans, João Cruz, and G. Puddu
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle model, Quarkonium
Published: 2000
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17. φ, ρ and ω production in Pb-Pb collisions at 158 GeV/c2 per nucleon

Author: H.R. Gulkanyan, C. Soave, Paolo Giubellino, A. Masoni, B. Espagnon, S. Silva, C. Baglin, J. Fargeix, S. Mehrabyan, I. Ropotar, Brigitte Cheynis, A. Musso, P. Petiau, L. Villatte, J.-R. Pizzi, W.L. Prado da Silva, Mario Sitta, Nicole Willis, Bruno Alessandro, P. Rato-Mendes, A. Guichard, P. Sonderegger, T. Chambon, Sergio Serci, R. Haroutunian, Enrico Scomparin, C. Racca, M. Gallio, S.N. Filippov, M. Gonin, M. P. Comets, A. Marzari-Chiesa, Y.K. Gavrilov, X. Tarrago, F. Ohlsson-Malek, Marco Monteno, Y. Le Bornec, J.-Y. Grossiord, F. Bellaiche, N. Constans, Alexey Kurepin, A. Romana, F.F. Guber, Calin Alexa, G. L. Usai, A. Baldit, Serban Constantinescu, J. Astruc, P. Macciotta, J. Castor, S. Mourgues, Roberta Arnaldi, L. Casagrande, Corrado Cicalo, V. Boldea, T.L. Karavitcheva, L. Ramello, A. Bussiere, N. De Marco, B. Chaurand, A.A. Grigorian, O. Drapier, C. Gerschel, A. Devaux, M.C. Abreau, E. Vercellin, M. Bedjidian, François Fleuret, M.B. Golubeva, L. Capelli, Massimo Masera, João Cruz, Sanda Dita, A. De Falco, D. Jouan, Laurent Ducroux, E. Chiavassa, Ruben Shahoyan, Carlos Lourenco, L. Kluberg, P. Saturnini, N.S. Topilskaya, V. Caponi, A. Piccotti, C. Quintans, M. Atayan, G. Puddu, Stefania Beole, P. Force, M. Mac Cormick, R. Hakobyan, Marek Idzik, S. Ramos, G. Dellacasa, L. Riccati, and I. Chevrot
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Nucleon
Published: 1999
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18. Fission of lead projectiles in Pb-nucleus collisions at the SPS

Author: F. Ohlsson-Malek, Ermanno Vercellin, Stefania Beole, W.L. Prado da Silva, P. Force, H.R. Gulkanyan, C. Soave, G. Dellacasa, Enrico Scalas, G. L. Usai, B. Chaurand, S. Mehrabyan, A. B. Kurepin, F.F. Guber, J. Astruc, C. Gerschel, A. Guichard, M. Mac Cormick, L. Villatte, T.L. Karavitcheva, L. Riccati, Calin Alexa, Paolo Giubellino, I. Ropotar, I. Chevrot, M. Bedjidian, O. Drapier, C. Racca, G. Puddu, Mario Sitta, R. Haroutunian, Corrado Cicalo, J. Fargeix, A. Bussiere, Sergio Serci, S. Ramos, A. Musso, Laurent Ducroux, B. Espagnon, P. Petiau, A. Masoni, Alessandro Ferretti, Y.K. Gavrilov, Enrico Scomparin, Mauro Gallio, M. Gonin, M.B. Golubeva, V. Boldea, A. Romana, P. Sonderegger, L. Capelli, A. Marzari-Chiesa, Marco Monteno, Sanda Dita, D. Jouan, Y. Le Bornec, J. Castor, S. Silva, L. Casagrande, Brigitte Cheynis, N. De Marco, N. Constans, P. Bordalo, R. Hakobyan, N. Willis, A. Devaux, Marek Idzik, A. De Falco, P. Saturnini, A. Piccotti, J.-Y. Grossiord, M.C. Abreu, S. Mourgues, Roberta Arnaldi, S.N. Filippov, João Cruz, A.A. Grigorian, A. Baldit, Serban Constantinescu, X. Tarrago, Bruno Alessandro, Pietro Cortese, Carlos Lourenco, L. Kluberg, N.S. Topilskaya, J.-R. Pizzi, L. Ramello, T. Chambon, V. Caponi, C. Quintans, M. Atayan, M. P. Comets, F. Bellaiche, C. Baglin, P. Rato-Mendes, P. Macciotta, Massimo Masera, E. Chiavassa, Ruben Shahoyan, Chiara Oppedisano, and François Fleuret
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Lead (geology), medicine.anatomical_structure, Fission, Projectile, medicine, Nucleus
Published: 1999
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19. F, ϱ and ω production in collisions induced by deuteron and heavy ions around 200 GeV per nucleon

Author: A. De Falco, Rachid Mazini, Y. Le Bornec, O. Drapier, C. Barrière, H.R. Gulkanyan, Ermanno Vercellin, C. Soave, P. Saturnini, M. Mac Cormick, S. Silva, P. Petiau, Massimo Masera, E. Chiavassa, Ruben Shahoyan, W.L. Prado da Silva, R. Haroutunian, V. Capony, F.F. Guber, Paolo Giubellino, P. Sonderegger, G. Puddu, N. Willis, A. Devaux, M. P. Comets, T. Chambon, J. Castor, S. Mehrabyan, Brigitte Cheynis, S. Filippov, J.M. Gago, A. Bussiere, J. Guimara˜es, Petar Temnikov, P. Gorodestky, L. Fredj, X. Tarrago, J. Fargeix, A. Marzari-Chiesa, L. Casagrande, S. Beole, J. Astruc, S. Sartori, M.C. Abreu, B. Chaurand, S. Papillon, J.-Y. Grossiord, S. Serci, T.L. Karavitcheva, Y.K. Gavrilov, A. Baldit, S. Ramos, A. Romana, J.P. Guillaud, N. De Marco, R. Ferreira, C. Gerschel, C. Racca, Calin Alexa, Corrado Cicalo, B. Espagnon, Alexey Kurepin, P. Force, M. Bedjidian, A. Piccotti, Alberto Masoni, G. Dellacasa, R. Kossakowski, D. Jouan, S. Mourgues, Roberta Arnaldi, Enrico Scomparin, B. Grosdidier, M. Gonin, M.B. Golubeva, L. Riccati, I. Chevrot, T. Monteiro, R. Mandry, D. Lazic, F. Bellaiche, L. Ramello, L. Luquin, G. L. Usai, G. Landaud, Claude Charlot, R.A. Salmeron, A. Guichard, F. Ohlsson-Malek, C. Vale, C. Quintans, M. Atayan, C. Baglin, P. Rato-Mendes, Philippe Busson, P. Macciotta, Joao Varela, Bruno Alessandro, Marek Idzik, J.-R. Pizzi, François Fleuret, P. Bordalo, R. Hakobyan, João Cruz, Didier Contardo, B. Ronceux, Carlos Lourenco, L. Kluberg, N.S. Topilskaya, F. Vazeille, A. Musso, Serban Constantinescu, A.A. Grigorian, P. Liaud, E. Descroix, Sanda Dita, Mauro Gallio, A. Borhani, and V. Boldea
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Deuterium, Nucleon, Ion
Published: 1998
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20. Anomalous suppression in PbPb interactions at 158 GeV/c per nucleon

Author: R. Haroutunian, G. Landaud, J.Y. Grossiord, F. Bellaiche, L. Ramello, P. Bordalo, A. Devaux, Paolo Giubellino, S. Silva, B. Cheynis, Petar Temnikov, C. Racca, A. Musso, V. Capony, Carlos Lourenco, L. Kluberg, N.S. Topilskaya, Ermanno Vercellin, Corrado Cicalo, Y. Lebornec, C. Quintans, W.L. Prado da Silva, Bruno Alessandro, C. Vale, I. Chevrot, A. Romana, G. Puddu, F. Ohlsson-Malek, João Cruz, O. Drapier, Y.K. Gavrilov, J. Fargeix, A. Marzari-Chiesa, Calin Alexa, Sergio Serci, Marek Idzik, A. Bussiere, M. Bedjidian, L. Luquin, B. Chaurand, Wladyslaw Dabrowski, C. Gerschel, N. De Marco, C. Soave, A. Guichard, M.B. Golubeva, A. Piccotti, J. Castor, D. Jouan, T. Chambon, X. Tarrago, A. B. Kurepin, F.F. Guber, Serban Constantinescu, G. L. Usai, A. De Falco, J. Astruc, P. Saturnini, N. Willis, L. Riccati, Ph. Gorodetzky, A. Masoni, Stefania Beole, G. Dellacasa, J.R. Pizzi, P. Force, S. Ramos, A. Baldit, S. Sartori, M.C. Abreu, T.L. Karavitcheva, B. Espagnon, Massimo Masera, E. Chiavassa, C. Baglin, P. Rato-Mendes, P. Macciotta, P. Guaita, Sanda Dita, François Fleuret, Mauro Gallio, V. Boldea, P. Petiau, P. Sonderegger, L. Gatignon, G. Bonazzola, S. Mourgues, Enrico Scomparin, A. Borhani, and M. Gonin
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Proton, Yield (chemistry), Quark–gluon plasma, Drell–Yan process, Atomic physics, Expected value, Nucleon, Central region, Ion
Abstract: The Drell-Yan and J ψ cross-sections measured in PbPb collisions are compared with the values extrapolated from the results obtained in proton and light ion induced reactions. While the Drell-Yan production exhibits the normal expected behaviour, the yield of J ψ in PbPb interactions is abnormally low, as it lies 9 standard deviations below the expected value. Moreover, the departure from the expected behaviour increases significantly from peripheral to central collisions.
Published: 1997
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21. Anomalous suppression in Pb+Pb collisions at 158×A GeV/c

Author: R. Kossakowski, S. Mourgues, Alberto Masoni, Carlos Lourenco, L. Kluberg, N.S. Topilskaya, N. Willis, Serban Constantinescu, R. Shaoian, A. Devaux, J.-Y. Grossiord, B. Espagnon, F. Ohlsson-Malek, G. L. Usai, G. Dellacasa, Ph. Gorodetzky, Wladyslaw Dabrowski, Sanda Dita, D. Jouan, A. Piccotti, R. Haroutunian, Paolo Giubellino, T. Chambon, I. Chevrot, C. Baglin, M. Masera, E. Chiavassa, X. Tarrago, M. Bedjidian, F.F. Guber, P. Rato-Mendes, S. Serci, J.-R. Pizzi, B. Chaurand, L. Riccati, A. Borhani, V. Boldea, Bruno Alessandro, M. Ceru, C. Gerschel, L. Luquin, Luciano Ramello, J. Astruc, P. Macciotta, A. Bussiere, Marek Idzik, Ermanno Vercellin, A. Musso, J. Fargeix, A. De Falco, M.B. Golubeva, A. Marzari-Chiesa, C. Racca, F. Bellaiche, M.S. Sartori, P. Guaita, S. Ramos, P. Saturnini, P. Force, A. Romana, A. Baldit, Calin Alexa, G. Puddu, P. Petiau, M. Gallio, A. Guichard, Y. Le Bornec, G. Landaud, P. Sonderegger, M.C. Abreu, François Fleuret, Y.K. Gavrilov, T.L. Karavitcheva, M. Gonin, Enrico Scomparin, P. Bordalo, Alexey Kurepin, S. Beole, W. L. Prado Da Silva, J. Castor, N. De Marco, Corrado Cicalo, S. Silva, V. Capony, Brigitte Cheynis, O. Drapier, and Petar Temnikov
Subjects: Physics, Nuclear and High Energy Physics, Analytical chemistry, Drell–Yan process
Abstract: Cross sections for J ψ,ψ′ and Drell-Yan production in Pb+Pb collisions at 158×A GeV/c are presented and compared with results obtained by the NA38 and NA51 collaborations. The Pb+Pb data have been collected by the NA50 collaboration using the NA38 dimuon spectrometer. The Drell-Yan mechanism is found to scale as (Aprojectile · Btarget) in p+Btarget and Aprojectile+Btarget collisions including Pb+Pb collisions. Regarding J ψ , an anomalous suppression is observed in Pb+Pb collisions with respect to the suppression observed in p+Btarget, O+Btarget and S+U collisions. The cross section ratios ψ′ ( J ψ ) are similar in Pb+Pb and S+U collisions.
Published: 1996
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22. ϕ, ρ andω production in collisions induced by deuteron and heavy ions at 200 A GeV/c

Author: A. Borhani, V. Boldea, S. Silva, J. Astruc, R. Kossakowski, Sanda Dita, D. Jouan, G. Landaud, C. Baglin, N. De Marco, G. Bonazzola, M. Ceru, A. Bussiere, P. Rato-Mendes, A. Piccotti, X. Tarrago, A. Guichard, S. Serci, A. Romana, Y. Le Bornec, P. Guaita, Calin Alexa, J. R. Pizzi, M. Gonin, W. Dabrowski, M. Gallio, J. Castor, F.F. Guber, François Fleuret, S. Mourgues, M.C. Abreu, R. Haroutunian, B. Chaurand, Petar Temnikov, Ph. Gorodetzky, Alberto Masoni, Luciano Ramello, T.L. Karavitcheva, C. Gerschel, Y.K. Gavrilov, A. Baldit, M.B. Golubeva, Alexey Kurepin, F. Ohlsson-Malek, J. Fargeix, A. Marzari-Chiesa, G. Dellacasa, P. Petiau, Carlos Lourenco, S. Ramos, Enrico Scomparin, O. Drapier, T. Chambon, Ermanno Vercellin, P. Sonderegger, L. Kluberg, N.S. Topilskaya, L. Luquin, C. Racca, W.L. Prado da Silva, L. Riccati, M. Masera, F. Bellaiche, Paolo Giubellino, A. De Falco, S. Beole, C. Cicalo, Na Collaborations, R. Shaoian, Bruno Alessandro, J.-Y. Grossiord, G. Puddu, I. Chevrot, Bruno Espagnon, Serban Constantinescu, Marek Idzik, P. Bordalo, A. Devaux, P. Macciotta, A. Musso, P. Force, G. L. Usai, E. Chiavassa, V. Capony, Brigitte Cheynis, M. Bedjidian, P. Saturnini, and N. Willis
Subjects: Nuclear physics, Physics, Nuclear reaction, Nuclear and High Energy Physics, Meson, Hadron, General Physics and Astronomy, Transverse mass, Strangeness production, Elementary particle, Nucleon, Quarkonium
Abstract: The production of low mass dimuons has been measured in d-C, d-U and S-U collisions at 200 GeV per nucleon, and in Pb-Pb collisions at 160 GeV per nucleon. Theϕ, ρ andω productions in S-U collision [1, 2] are extracted from a new set of data with increased statistic, and are throughϕ/(ω+ρ) ratio compared to first results on deuteron induced production. These new analyses are presented in the limitedM T domain of recent Pb-Pb measurement whose preliminary results are also presented.
Published: 1996
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23. Muon pair and vector meson cross-sections in p-W and SU collisions at 200 GeV/nucleon

Author: R. Ferreira, Carlos Lourenco, A. Baldisseri, J. Fargeix, A. Romana, L. Kluberg, J. Castor, S. Papillon, B. Chaurand, Luis Peralta, C. Gerschel, X. Tarrago, Ph. Gorodetzky, A. Bussière, C. Racca, R. Kossakowski, J.M. Gago, E. Descroix, P. Bordalo, A. Devaux, P. Liaud, T. Chambon, O. Drapier, Rachid Mazini, G. Landaud, J.-R. Pizzi, Didier Contardo, S. Silva, M. Bedjidian, Joao Varela, M.C. Abreu, A. Guichard, B. Espagnon, C. Baglin, R. Haroutunian, P. Force, J.-Y. Grossiord, P. Sonderegger, J. P. Guillaud, S. Ramos, A. Baldit, and D. Jouan
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Muon, Pair production, Transverse momentum, Rapidity, Vector meson, Nucleon, Power law
Abstract: Muon pair production is studied in p-W and SU collisions at 200 GeV per nucleon, as a function of transverse momentum PTμμ. The inclusive ϱ+ω and Φ differential cross-sections dσ dP T are measured in the dimuon decay channel, for PT ≥ 0.6 GeV/c, in the central rapidity region, 3.0≤ y ≤ 4.0. Assuming the power law A-dependence σ = σ0(Abeam·Atarget)α, the study of the integrated cross-sections for p-W and SU collisions leads to αϱ+ω = 1.00±0.02±0.07 and αΦ = 1.23±0.03±0.05, showing clear evidence of Φ enhancement in SU interactions as compared to p-W collisions.
Published: 1996
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24. Production of ϱ + ω and Φ in p-W and SU collisions at 200 GeV/nucleon

Author: B. Espagnon, C. Baglin, A. Romana, M.C. Abreu, S. Papillon, G. Landaud, Ph. Gorodetzky, S. Silva, J. Castor, X. Tarrago, A. Guichard, B. Chaurand, Joao Varela, O. Drapier, M. Bedjidian, C. Gerschel, R. Kossakowski, C. Racca, D. Jouan, S. Ramos, A. Baldit, A. Bussière, R. Ferreira, E. Descroix, P. Force, J. Fargeix, P. Sonderegger, J.-R. Pizzi, J.M. Gago, Didier Contardo, Luis Peralta, Carlos Lourenco, L. Kluberg, T. Chambon, Rachid Mazini, A. Baldisseri, P. Liaud, P. Bordalo, A. Devaux, J.-Y. Grossiord, J. P. Guillaud, and R. Haroutunian
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Transverse momentum, Energy density, Transverse mass, Rapidity, Nuclear Experiment, Nucleon
Abstract: The transverse mass differential cross-sections for the ϱ + ω and Φ resonances is obtained, in the central rapidity region, in p - W and S  U interactions at 200 GeV/nucleon. The measured ϱ + ω and Φ temperatures are ∼ 15% higher in S  U as compared to p - W collisions. The ratio of cross-sections times branching ratios into the dimuon channel B Φ σ Φ (B ϱ σ ϱ + B ω σ ω ) is studied as a function of the energy density reached in the collision and of the dimuon transverse momentum. The measured ratio is 2 to 3 times larger in S  U than in p - W collisions and an enhancement is observed in S  U interactions with increasing energy density.
Published: 1996
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25. Ψ′ and J/Ψ production in p-W, p-U and S-U interactions at 200 GeV/nucleon

Author: P. Liaud, C. Barriere, P. Force, B. Espagnon, R. Haroutunian, R. Kossakowski, J. Castor, L. Luquin, J.-R. Pizzi, T. Chambon, X. Tarrago, O. Drapier, B. Chaurand, R. Mandry, P. Bordalo, C. Gerschel, S. Ramos, M.C. Abreu, Didier Contardo, A. Devaux, A. Guichard, Carlos Lourenco, L. Kluberg, G. Landaud, M. Bedjidian, C. Baglin, C. Racca, Luis Peralta, P. Sonderegger, Joao Varela, S. Silva, R. Ferreira, Rachid Mazini, J.-Y. Grossiord, J.P. Guillaud, P. Saturnini, F. Ohlsson-Malek, B. Ronceux, A. Bussiere, D. Jouan, D. Lazic, J. Fargeix, E. Descroix, A. Romana, and Ph. Gorodetzky
Subjects: inorganic chemicals, Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, chemistry, digestive, oral, and skin physiology, chemistry.chemical_element, Tungsten, Uranium, Nucleon, respiratory tract diseases
Abstract: Ψ′ and J/Ψ yields are compared in p-W, p-U and S-U interactions at 200 GeV/nucleon. Their ratio decreases from proton-t to sulphur-induced reactions. It also decreases in sulphur-induced reactions from peripheral to central collisions. This result could indicate that the Ψ′ and J/Ψ suppression mechanisms have different origins in p- and S-induced reactions.
Published: 1995
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26. 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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27. 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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28. 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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29. Meson production inp+U, O+U and S+U interactions at 200 GeV/nucleon

Author: F. Staley, E. Descroix, A. Bussiere, C. Racca, P. Liaud, Philippe Busson, R.A. Salmeron, S. Ramos, M.C. Abreu, A. Baldit, S. Silva, A. Guichard, J. Castor, A. Baldisseri, Carlos Lourenco, L. Kluberg, J. P. Guillaud, R. Ferreira, D. Jouan, J.M. Gago, O. Drapier, C. Baglin, Ph. Gorodetzky, R. Kossakowski, Francois Vazeille, R. Cases, R. Haroutunian, G. Landaud, Claude Charlot, P. Bordalo, C. Barriere, M. Bedjidian, J. Fargeix, A. Devaux, J.-R. Pizzi, B. Chaurand, C. Gerschel, Luis Peralta, Didier Contardo, P. Force, T. Chambon, J.-Y. Grossiord, X. Felgeyrolles, Joao Varela, X. Tarrago, A. Romana, P. Sonderegger, L. Fredj, S. Papillon, and B. Grosdidier
Subjects: Physics, Nuclear reaction, Particle physics, Physics and Astronomy (miscellaneous), Proton, Meson, Nuclear Theory, Hadron, Elementary particle, Nuclear physics, Pion, Nuclear Experiment, Nucleon, Engineering (miscellaneous), Boson
Abstract: Meson production in proton, oxygen and sulphur interactions with uranium targets at 200 GeV/nucleon is studied. We measure the inclusive meson cross-section d σ/dPT2 and its evolution fromp+U to S+U. The cross-section fitted with an exponential gives an inverse slopePT0 of the order of 210 MeV/c. As a function of the neutral transverse energy,PT0 values show a slight rise followed by a plateau. The normalized difference (σ+−σ−)/σ− between positive and negative meson cross-sections is found to increase withET.
Published: 1992
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30. Muon pair production in heavy ion interactions at 200 GeV per nucleon

Author: A. Bussiere, B. Chaurand, J.-R. Pizzi, R. Haroutunian, C. Gerschel, G. Landaud, A. Baldisseri, P. Liaud, J.-Y. Grossiord, X. Tarrago, M. Bedjidian, B. Grosdidier, A. Baldit, Carlos Lourenco, Didier Contardo, L. Kluberg, J.P. Guillaud, X. Felgeyrolles, P. Sonderegger, F. Staley, J. Castor, D. Jouan, Ph. Gorodetzky, R. Kossakowski, P. Bordalo, P. Force, Luis Peralta, S. Papillon, P. Busson, C. Racca, A. Devaux, A. Descroix, T. Chambon, S. Ramos, A. Romana, Claude Charlot, R.A. Salmeron, A. Guichard, O. Drapier, J.M. Gago, M.C. Abreu, Joao Varela, J. Fargeix, S. Silva, C. Baglin, L. Fredj, R. Ferreira, Francois Vazeille, and R. Cases
Subjects: Nuclear reaction, Physics, Nuclear and High Energy Physics, Muon, Quarkonium, Nuclear physics, Particle decay, Pair production, Effective mass (solid-state physics), High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, Nucleon, Lepton
Abstract: The NA38 experiment measures muon pair production in 200 GeV per nucleon nucleus-nucleus interactions at the CERN SPS. Dimuon production is studied as a function of the neutral transverse energy produced in the collisions, which reflects the energy density reached in the interaction. The J / ψ yield relative to muon pairs in the mass continuum decreases with increasing energy density. The atomic number dependence of the cross sections has been studied using the parametrization σ ∞ ( A proj . A targ . ) α which leads to α = 0.91 ± 0.04 for the J / ψ , and α = 1.01 ± 0.04 for muon pairs in the mass range [1.7, 2.7] GeV/c 2 . The study of dimuon transverse momentum distributions shows an enhancement of the J / ψ suppression for low P T values. The average values 〈P T 〉 and 〈P T 2 〉 increase with increasing transverse energy in case of the J / ψ , and are rather flat for muon pairs in the mass continuum. Such a behaviour is expected in case of quark-gluon plasma formation. However, a model based on parton multiple scattering in the initial state leads to a variation of 〈P T 2 〉 as a function of the mean thickness of nuclear matter encountered by the partons, which seems also to account for the observed effect. In addition, low mass dimuons are studied. An enhancement of the φ /( ϱ + ω ) ratio is observed with increasing energy density.
Published: 1992
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31. 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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32. 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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33. 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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34. 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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35. 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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36. J/ψ PRODUCTION IN 158 GeV INDIUM-INDIUM COLLISIONS

Author: Pietro Cortese, P. Sonderegger, P. Ramalhete, Carlos Lourenco, A. De Falco, L. Kluberg, Hiroaki Ohnishi, P. Force, Laurent Ducroux, Rob Veenhof, Roberta Arnaldi, H. Gulkanian, E. Radermacher, J. Lozano, Markus Keil, B. Chaurand, P. Rosinsky, Ralf Peter Averbeck, H. En'yo, Alessandro Ferretti, P. Parracho, A. Devaux, Hermine Katharina Wöhri, P. Martins, S. Serci, P. Pillot, Alberto Masoni, C. Oppedisano, Franck Manso, J. M. Heuser, A. Colla, K. Banicz, C. Cicalo, G. Puddu, H. J. Specht, J. Castor, S. Damjanovic, Enrico Scomparin, Raphael Noel Tieulent, J. Seixas, A. Neves, A. Drees, G. L. Usai, N. Guettet, A. Förster, Michele Floris, A. David, Ruben Shahoyan, and A. Guichard
Subjects: Physics, Nuclear physics, Particle physics, chemistry, chemistry.chemical_element, Indium
Published: 2007
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37. 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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38. Low mass dimuon production in proton-nucleus and Indium-Indium collisions

Author: A. Devaux, A. Förster, P. Sonderegger, N. Guettet, Pietro Cortese, Rob Veenhof, P. Force, Markus Keil, Laurent Ducroux, H. J. Specht, S. Serci, A. De Falco, Ralf Peter Averbeck, A. Guichard, P. Pillot, A. Colla, Carlos Lourenco, B. Chaurand, L. Kluberg, H. K. Woehri, S. Damjanovic, C. Oppedisano, P. Ramalhete, Franck Manso, A. David, K. Banicz, J. Castor, E. Radermacher, H. En'yo, J. M. Heuser, Enrico Scomparin, J. Lozano, P. Parracho, Hiroaki Ohnishi, Michele Floris, G. Puddu, P. Rosinsky, P. Martins, Raphael Noel Tieulent, Alberto Masoni, R. Shahoian, C. Cicalo, H. Gulkanian, Roberta Arnaldi, Alessandro Ferretti, A. Drees, G. L. Usai, J. Seixas, and A. Neves
Subjects: Physics, Particle physics, Muon, Large Hadron Collider, Meson, Proton, Mass distribution, Physics::Instrumentation and Detectors, Nuclear Theory, chemistry.chemical_element, Spectral line, Nuclear physics, chemistry, High Energy Physics::Experiment, Nuclear Experiment, Low Mass, Indium
Abstract: The NA60 experiment studied low-mass dimuon production in proton-nucleus and indium-indium collisions at the CERN SPS. While the p-A data can be well described by a superposition of light neutral meson decays, an excess is observed in the heavy-ion data, increasing with collision centrality, with respect to these expected sources. Thanks to the high statistics and good quality of our measurement, we can subtract the muon pairs due to h, h0, w and f decays from the signal dimuon mass distribution. The resulting spectra are compatible with a r spectral function broadening from peripheral to central collisions, with no change in the pole mass.
Published: 2007
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39. $J/\psi$ 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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40. $\psi'$ 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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41. 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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42. $\phi$ 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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43. 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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44. 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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45. φ Production in Proton-Nucleus and Indium-Indium Collisions at the CERN SPS

Author: P. Pillot, S. Serci, Hiroaki Ohnishi, A. Colla, P. Rosinsky, G. Puddu, Raphael Noel Tieulent, Alessandro Ferretti, J. Lozano, A. Neves, P. Martins, A. Guichard, P. Sonderegger, B. Chaurand, R. Averbeck, Alberto Masoni, Pietro Cortese, P. Ramalhete, Michele Floris, S. Damjanovic, M. Keil, Roberta Arnaldi, H. Gulkanian, Chiara Oppedisano, Carlos Lourenco, Enrico Scomparin, P. Force, Laurent Ducroux, L. Kluberg, P. Parracho, J. Castor, Corrado Cicalo, Ruben Shahoyan, A. De Falco, A. Drees, G. L. Usai, Joao Seixas, A. David, Rob Veenhof, H. J. Specht, E. Radermacher, A. Devaux, K. Banicz, Hermine Katharina Wöhri, J. M. Heuser, N. Guettet, H. En'yo, and Franck Manso
Subjects: Physics, Particle physics, Large Hadron Collider, Meson, Proton, Silicon, Nuclear Theory, Inverse, chemistry.chemical_element, law.invention, Nuclear physics, Telescope, chemistry, law, Nuclear Experiment, Nucleon, Indium
Abstract: The quality of the dimuon measurements made by NA60, in proton‐nucleus and heavy‐ion collisions, is much better than that reached by previous experiments, such as NA38 and NA50. The most important improvement is due to the use of a radiation‐tolerant silicon vertex telescope, placed immediately downstream of the target. This allows NA60 to do a high quality measurement of φ meson yields and pT distributions.This paper presents results obtained in p‐Be, p‐In and p‐Pb collisions at 400 GeV, from data collected in 2002, and in In‐In collisions at 158 AGeV, as a function of centrality, from the 2003 running period. In particular, we show that the inverse mT slope measured in In‐In collisions, in the φ → μμ decay channel, increases with the number of nucleons participating in the collisions, rather than following a flat trend as seen in the NA50 data collected in the same decay channel but restricted to high pT values. We also show that our measurements seem to agree with the values previously measured by NA49...
Published: 2006
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46. Results from NA60 experiment at the CERN SPS

Author: Pietro Cortese, Carlos Lourenco, E. Radermacher, P. Rosinsky, Hermine Katharina Wöhri, P. Ramalhete, Enrico Scomparin, P. Sonderegger, M. Keil, R. Averbeck, P. Parracho, J. Lozano, Roberta Arnaldi, S. Damjanovic, A. Guichard, H. J. Specht, J. M. Heuser, L. Kluberg, P. Pillot, A. Devaux, A. David, P. Force, A. De Falco, N. Guettet, B. Chaurand, A. Colla, K. Banicz, Raphael Noel Tieulent, Alessandro Ferretti, H. En'yo, S. Serci, A. Drees, Franck Manso, Alberto Masoni, Hiroaki Ohnishi, G. L. Usai, A. Neves, G. Puddu, Laurent Ducroux, H. Gulkanian, Joao Seixas, P. Martins, Rob Veenhof, J. Castor, Corrado Cicalo, 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), 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), 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), and Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Physics, Particle physics, Large Hadron Collider, Muon, Physics::Instrumentation and Detectors, Nuclear Theory, 020206 networking & telecommunications, 02 engineering and technology, heavy ion collisions $\rho$ meson, open charm, 25.75.-q,25.75.Dw,14.40.Cs, Nuclear physics, Pair production, J/$\psi$ suppression, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 0202 electrical engineering, electronic engineering, information engineering, High Energy Physics::Experiment, 020201 artificial intelligence & image processing, Invariant mass, Open charm, Nuclear Experiment, Nucleon, Low Mass
Abstract: NA60; International audience; The NA60 experiment studies open charm and prompt dimuon production in proton-nucleus and nucleus-nucleus collisions at the CERN SPS. During 2003 the experiment collected data in indium-indium collisions at 158 GeV per nucleon. In this paper the first results on low mass dimuons, open charm production and J/$\psi$ suppression are presented.
Published: 2006
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47. 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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48. 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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49. 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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50. 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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