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9 results on '"L. Meritet"'

1. Spectrometers for measurements of recoils and scattered particles from 5 GeV pion-helium interactions

Author

J. Berthot, Bernard Ille, C. Doré, W. Gajewski, Tord Ekelof, P. Grafström, J.P. Burq, L. Meritet, S. Dahlgren, P. Cotte, M. Chevallier, G. Douhet, S. Kullander, M. Chemarin, B. Badelek, M. Lambert, E. Hagberg, M. Querrou, J. Nassalski, S. Jonsson, F. Vazeille, Allan Hallgren, J.P. Martin, S. Maury, 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), CAS-PHABIO, 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), 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 Flores, Sylvie

Subjects
Physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Spectrometer, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Nuclear Theory, chemistry.chemical_element, General Medicine, 7. Clean energy, 01 natural sciences, Semiconductor detector, Nuclear physics, Pion, Recoil, chemistry, 0103 physical sciences, Scintillation counter, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Isobar, Nuclear Experiment, 010306 general physics, Nucleon, Helium
Abstract

An apparatus, used to search for nucleon isobars, x , in π 4 He → π t x or π 4 He → π 3 He x reactions, is described. The nuclear fragment and the scattered fast pion were measured in a recoil spectrometer and a fast-particle spectrometer, respectively. The recoil spectrometer has multiwire proportional chambers (MWPC) for the measurement of direction and semiconductor detectors and scintillation counters for the measurement of energy. The identification of the recoil is accomplished by means of the E , ΔE method. The target is gaseous to allow the measurement of low-energy recoils and it can hold pressures up to 150 atm. The spectrometer for the scattered pion consists of a magnet and MWPC's.

Published
1978
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2. Λ0 polarization in proton-proton interactions from √s = 31 to 62 GeV

Author

S. Vernetto, J. Zweizig, S. Erhan, L. Meritet, J.B. Cheze, N. Medinnis, P.E. Schlein, P. Sherwood, J. Zsembery, A. Castellina, F. Vazeille, A. Montag, R. Bonino, A. M. Smith, and J. Alitti

Subjects
Physics, Nuclear and High Energy Physics, Large Hadron Collider, 010308 nuclear & particles physics, Intersecting Storage Rings, Hyperon, Polarization (waves), 01 natural sciences, Nuclear physics, symbols.namesake, 0103 physical sciences, Transverse momentum, symbols, Feynman diagram, 010306 general physics
Abstract

We report Λ 0 -hyperon polarization measurements at the CERN intersecting storage rings from √ s of 31 to 62 GeV. P Λ 0 changes insignificantly, +(0.8±1.7)%, over this range of √ s . However, P Λ 0 is observed to grow with Feynman- x F and with transverse momentum. At an average p t of 1.1 GeV/ c , P Λ 0 depends linearly on x F and approaches −40% at x F =0.8.

Published
1987
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3. Unusual production features of isoscalar mesons in proton diffractive dissociation at the CERN-ISR

Author

P. Chauvat, P.E. Schlein, S. Vernetto, B. Bloch-Devaux, Antonella Castellina, Samim Erhan, R. Bonino, A. Montag, J.B. Cheze, Mike Medinnis, M. Reyrolle, J. Zsembery, P. Sherwood, J. Zweizig, L. Meritet, A.M. Smith, K. Hayes, F. Vazeille, J. Alitti, R. Cousins, B. Pichard, J. Mallet, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), and 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)

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Proton, Meson, 010308 nuclear & particles physics, Isoscalar, Hadron, Elementary particle, 01 natural sciences, Helicity, Nuclear physics, Pion, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 010306 general physics, Nucleon, Particle Physics - Experiment
Abstract

D(1285) and E/iota(1422) are observed in the diffractive dissociation process, pp→(pK 0 K +- π ± )p, with √ s =63Gev. The D(1285) is produced with dominant ±1 helicity. Several unusual features of the data suggest that the mesonic states result from gluonic interactions in the collision.

Published
1984
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4. Observation of correlations between forward protons and 90° trigger protons at √s=62 GeV

Author

J.B. Cheze, A. Montag, J. Zsembery, P. Sherwood, J. Alitti, A. M. Smith, Francois Vazeille, S. Vernetto, R. Bonino, P.E. Schlein, Gunnar Ingelman, L. Meritet, M. Reyrolle, Mike Medinnis, B. Bloch-Devaux, A. Castellina, Samim Erhan, and J. Zweizig

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Antiparticle, Proton, 010308 nuclear & particles physics, Hadron, 01 natural sciences, Charged particle, Ion, Nuclear physics, Diquark, Pion, Antiproton, 0103 physical sciences, 010306 general physics
Abstract

We study the production of π+'s and protons at 90° with pt>1.15 GeV and their correlations with forward protons. Fewer forward protons are observed for a 90° proton trigger than for a π+ trigger. This is in qualitative agreement with the idea of an effective diquark scattering mechanism. Additionally, we observe that a K+ produced at 90° is correlated with an enhanced forward production of λO.

Published
1987
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5. Production and knockout of nucleon isobars from helium by 5 GeV pions

Author

M. Lambert, P. C. Gugelot, B. Badelek, C. Doré, J. Berthot, G. Faldt, M. Querrou, L. Meritet, Bernard Ille, S. Kullander, P. Grafström, Allan Hallgren, S. Jonsson, J.P. Burq, J. Nassalski, P. Cotte, M. Chevallier, F. Vazeille, M. Chemarin, E. Hagberg, Tord Ekelof, S. Dahlgren, 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), CAS-PHABIO, 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), 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 reaction, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Hadron, Elementary particle, Fermion, 01 natural sciences, Baryon, Pion, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Production (computer science), Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

Using both recoil and fast-particle spectrometers, the reaction ${\ensuremath{\pi}}^{\ensuremath{-}}+^{4}\mathrm{He}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}+^{3}\mathrm{H}+x$ has been measured for triton momenta in the region 0.24-0.60 GeV/c. The experimental spectra are presented as functions of triton momentum and angle and of mass of the unmeasured object. In the theoretical analysis it is assumed that the final state can be reached via quasielastic scattering from ${N}^{*}^{3}\mathrm{H}$ states and via ${N}^{*}$ productions from the $p^{3}\mathrm{H}$ state of helium. The most credible of three investigated $p^{3}\mathrm{H}$ wave functions requires one percent of ${N}^{*}^{3}\mathrm{H}$ states in the mass range 1.08-1.80 GeV/${\mathit{c}}^{2}$.NUCLEAR REACTIONS $^{4}\mathrm{He}({\ensuremath{\pi}}^{\ensuremath{-}},{\ensuremath{\pi}}^{\ensuremath{-}}x)t$, $E=5$ GeV, ${E}_{t}g10$ MeV measured $\ensuremath{\sigma}({\ensuremath{\theta}}_{t},{m}_{x})$, $\ensuremath{\sigma}({m}_{x},{E}_{t})$, $\ensuremath{\sigma}({m}_{x},{\ensuremath{\theta}}_{t})$; deduced $p\ensuremath{-}t$ wave-$f$, $x\ensuremath{-}t$ prob. $1.1l{m}_{x}l1.8$ GeV. $p({\ensuremath{\pi}}^{\ensuremath{-}},{\ensuremath{\pi}}^{\ensuremath{-}})x$, $E=5$ GeV, measured $\ensuremath{\sigma}({m}_{x})$.

Published
1980

6. Experimental results on elastic scattering of protons on the light nuclei $^2$H $^3$H $^3$He and $^4$He at 600 MeV

Author

G. Peynet, B. Ille, J. Gardes, M. Querrou, A. Lefort, J. Fain, J.F. Pauty, L. Meritet, F. Vazeille, 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), 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 reaction, Elastic scattering, Nuclear and High Energy Physics, Light nucleus, Range (particle radiation), 010308 nuclear & particles physics, Nuclear Theory, chemistry.chemical_element, Interference (wave propagation), 01 natural sciences, Square (algebra), Amplitude, chemistry, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Atomic physics, Nuclear Experiment, 010306 general physics, Helium
Abstract

Differential cross sections for the elastic scattering of protons on 2 H, 3 H, 3 He and 4 He have been measured at 600 MeV. Proton-deuterium elastic scattering is investigated in a four-momentum transfer square t -range corresponding to Coulomb-nuclear interference in order to determine the nucleon-nucleon amplitudes at 600 MeV. For the other nuclei, we investigate the t -range corresponding to the first and second maximum, in order to determine the mechanism of the nuclear process. A few physical comments on the results are made.

Published
1976

7. Evidence for pomeron single-quark interactions in proton diffraction at the ISR

Author

L. Meritet, M. Reyrolle, Gunnar Ingelman, P.E. Schlein, Francois Vazeille, J.B. Cheze, M. Medinnis, S. Erhan, J. Alitti, A. Montag, J. Zsembery, A. Castellina, R. Bonino, P. Sherwood, J. Zweizig, A.M. Smith, S. Vernetto, B. Bloch-Devaux, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), and 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)

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Proton, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Hadron, Hyperon, Elementary particle, 01 natural sciences, Hadronization, Baryon, Nuclear physics, Pomeron, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, 010306 general physics, Nucleon, Particle Physics - Experiment
Abstract

Measurements are presented of two exclusive diffractive reactions, pp → (Λ 0 φ 0 K + ) p and pp → (Λ 0 Λ 0 p)p , at √ s = 63 GeV . Pronounced correlations with the beam direction are observed (in the rest frame of the forward-going bracketed system) for those outgoing particles which contain the beam valence quarks. In each case there is a forward-Λ0 in correlation with a backward K+ or p, respectively. No such behavior is seen for the particles which do not contain beam valence quarks (φ 0 and Λ 0 , respectively) . Interpreted as examples of pomeron-proton scattering, these results constitute evidence that, for these final states, the pomeron interacts with a single valence quark and apparently back-scatters it. The subsequent hadronization leads to a longitudinal event structure.

Published
1985

8. Information on the nucleon-isobar content in helium from 5 GeV pion-helium interactions

Author

B. Badelek, P. Grafström, P. Cotte, J. Berthot, Bernard Ille, Allan Hallgren, M. Chevallier, M. Querrou, J.P. Burq, S. Jonsson, Tord Ekelof, M. Chemarin, E. Hagberg, M. Lambert, J. Nassalski, P.C. Gugelot, S. Kullander, S. Dahlgren, F. Vazeille, L. Meritet, C. Doré, 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), CAS-PHABIO, 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), 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, 010308 nuclear & particles physics, chemistry.chemical_element, Impulse (physics), 01 natural sciences, Nuclear physics, Pion, chemistry, 0103 physical sciences, Mass spectrum, Isobar, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 010306 general physics, Nucleon, Helium
Abstract

Missing mass spectra from the reactions πp → πx and πα → πtx have been measured and found to be significantly different. Neglecting all background processes an analysis with the impulse approximation yields a 0.24 percent presence of the isobar-triton state in helium in the triton momentum range 0.32–0.70 GeV c and the mass range 1.30–1.86 GeV c 2 .

Published
1979

9. Observation of longitudinal event structure in proton diffractive dissociation at the ISR

Author

J. Alitti, R. Bonino, A. Castellina, F. Vazeille, M. Reyrolle, J. Zweizig, S. Vernetto, B. Bloch-Devaux, A. Montag, A.M. Smith, J. Zsembery, Gunnar Ingelman, L. Meritet, M. Medinnis, P.E. Schlein, J.B. Cheze, S. Erhan, P. Sherwood, 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), and R&D

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Proton, Meson, 010308 nuclear & particles physics, Hadron, 01 natural sciences, Momentum, Nuclear physics, Pair production, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics::Accelerator Physics, Invariant mass, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Particle Physics - Experiment
Abstract

We study the internal structure of a forward-going pπ + π − π + π − system, with invariant mass in the range 2.5-4 GeV, produced through diffractive dissociation of a beam proton at the ISR. The shape of the system, as seen in its center-of-mass, deviates strongly from isotropic phase space and possesses, rather, a longitudinal structure with a major axis along the incoming proton direction. The final state proton momentum is aligned in the direction of the incoming proton, an effect which becomes more pronounced with increasing diffractive mass.

Published
1986

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