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10 results on '"M. Tamazouzt"'

1. Strange particle production in sulphur-tungsten interactions at 200 GEV/C per nucleon

Author

S. Abatzis, F. Antinori, R.P. Barnes, A.C. Bayes, M. Benayoun, W. Beusch, I.J. Bloodworth, A. Bravar, J.N. Carney, B. de la Cruz, D. Di Bari, J.P. Dufey, D. Evans, R. Fini, B.R. French, B. Ghidini, M. Girone, H. Helstrup, A.K. Holme, A. Jacholkowski, J. Kahane, J.B. Kinson, A. Kirk, K. Knudson, J.C. Lassalle, V. Lenti, Ph. Leruste, L.Lima Francês, R.A. Loconsole, A. Malamant, V. Manzari, F. Navach, J.L. Narjoux, A. Palano, A. Penzo, E. Quercigh, L. Rossi, K. Šafarik, M. Sené, R. Sené, M. Tamazouzt, M.T. Trainor, G. Vassiliadis, O.Villalobos Baillie, A. Volte, and M.F. Votruba

Subjects
Nuclear and High Energy Physics
Published
1992
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2. production in sulphur-tungsten interactions at 200 GeV/c per nucleon

Author

S. Abatzis, M.F. Votruba, K. Šafařík, A. Bravar, V. Lenti, K. Knudson, J. N. Carney, J. Kahane, I. J. Bloodworth, Federico Antinori, M. Tamazouzt, M. T. Trainor, V. Manzari, R. Fini, J.B. Kinson, A. Penzo, R. P. Barnes, M. Sené, A. Palano, J. C. Lassalle, A. Jacholkowski, A. Volte, B. De La Cruz, G. Vassiliadis, R. Sené, A. Kirk, J. P. Dufey, R. A. Loconsole, L. Lima Frances, O. Villalobos Baillie, Ph. Leruste, B. R. French, M. Girone, Leonardo Paolo Rossi, A.K. Holme, J. L. Narjoux, Haavard Helstrup, B. Ghidini, David H. Evans, W. Beusch, M. Benayoun, F. Navach, E. Quercigh, A. Malamant, and D. Di Bari

Subjects
Physics, Nuclear and High Energy Physics, Plasma formation, Nuclear Theory, chemistry.chemical_element, Tungsten, Omega, Sulfur, Baryon, Nuclear physics, chemistry, Quark–gluon plasma, Transverse mass, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, Nucleon
Abstract

Multi-strange baryon and antibaryon production is expected to be a useful probe in the search for quark-gluon plasma formation. We present the transverse mass distributions of negative particles, Λ' s , Λ ' s and Ξ − ' s produced in sulphur-tungsten interactions at 200 GeV/c per nucleon and give the corrected rations Λ /Λ, Ξ − /Λ and Ξ − / Λ . Our ratio Ξ − / Λ appears to be larger than that from pp interactions.

Published
1991
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3. Λ and anti-Λ production in 32S + W and p + W interactions at 200 A GeV/c

Author

R. Zitoun, V. Lenti, K. Knudson, J. N. Carney, M. T. Trainer, B. R. French, David H. Evans, I. J. Bloodworth, K. Manzari, A. Malamant, B. Ghidini, A. Jacholkowski, E. Quercigh, S. Abatzis, R. A. Loconsole, A. Bravar, W. Beusch, R. P. Barnes, Ph. Leruste, A. Volte, M. Benayoun, F. Navach, R. Sené, J. Kahane, A. Kirk, R. Fini, J. C. Lassalle, O. Villalobos Baillie, M. Tamazouzt, L. Lima Frances, J.B. Kinson, A. Penzo, J. P. Dufey, A. Palano, M. Stassinaki, M. Sené, M.F. Votruba, Leonardo Paolo Rossi, J. L. Narjoux, and G. Vassiliadis

Subjects
Nuclear reaction, Nuclear physics, Physics, Nuclear and High Energy Physics, Particle decay, Meson, Hadron, Hyperon, Nucleon, Lambda baryon, Boson
Published
1991
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4. Multi-strange baryon and antibaryon production in sulphur-tungsten and proton-tungsten interactions at 200 GeV/c per nucleon

Author

E. Quercigh, S. Abatzis, M. Sene, R. P. Barnes, B. Ghidini, F. Navach, J. P. Dufey, R. A. Fini, A. Palano, I. J. Bloodworth, O. Villalobos Baillie, A. Malamant, R. Falcone, M. T. Trainor, A. Volte, A. Bravar, J. Kahane, A. Kirk, Vito Manzari, G. Vassiliadis, R. Sené, W. Beusch, M.F. Votruba, B. R. French, M. Tamazouzt, R. A. Loconsole, Ph Leruste, J.B. Kinson, A. Penzo, M. Benayoun, K. Knudson, J. N. Carney, Leonardo Paolo Rossi, J. L. Narjoux, V. Lenti, M. Stassinaki, A. Jacholkowski, J. C. Lassalle, L. Lima Frances, and D. Evans

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, High Energy Physics::Phenomenology, Nuclear Theory, Hadron, Hyperon, Lambda baryon, Xi baryon, Nuclear physics, Baryon, Strange matter, Nuclear Experiment, Nucleon
Abstract

Production of multi-strange baryons and antibaryons is expected to be a useful indicator in the search for Quark-Gluon Plasma formation. Production of Ξ− and Ξ − has been observed for the first time in ultra-relativistic heavy ion interactions by the WA85 Experiment. We describe the procedure used to select these cascade candidates and show that Ξ− and Ξ − decays can be identified. Preliminary ratios of Ξ/Ξ production in sulphur-tungsten and proton-tungsten interactions are also presented.

Published
1991
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5. Λ and production in sulphur-tungsten interactions at 200 GeV/c per nucleon

Author

W. Beusch, M. Benayoun, F. Navach, M. Stassinaki, A. Volte, R. Sené, E. Quercigh, R. Zitoun, J. Kahane, Leonardo Paolo Rossi, David H. Evans, Michele Arturo Caponero, B. Ghidini, A. Bravar, A. Malamant, R. Fini, A. Jacholkowski, J. L. Narjoux, M. T. Trainor, R. A. Loconsole, B. R. French, A. Kirk, Ph. Leruste, M.F. Votruba, J. C. Lassalle, I. J. Bloodworth, J. P. Dufey, M. Tamazouzt, A. Palano, M. Sené, S. Abatzis, V. Lenti, K. Knudson, J. N. Carney, J.B. Kinson, A. Penzo, L. Lima Frances, G. Vassiliadis, O. Villalobos Baillie, and R. P. Barnes

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Meson, Hadron, Lambda baryon, Charged particle, Nuclear physics, Antimatter, High Energy Physics::Experiment, Rapidity, Atomic physics, Nuclear Experiment, Nucleon
Abstract

Results from the WA85 Experiment at the CERN Ω Spectrometer are presented. A 200 A GeV/ c beam of 32 S ions was used with a tungsten target. The apparatus is used to detect V 0, s and charged tracks in the range p T > 0.9 GeV/ c and 2.3 Y lab Λ and negative hadrons all show a linear increase with rapidity density in the range 70–140 as expected from models based on a superposition of independent NN collisions.

Published
1990
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6. Λ and anti-Λ production in 32S + W and p + W interactions at 200 A GeV/c

Author

Abatzis, S. Barnes, R.P. Benayoun, M. Beusch, W. Bloodworth, I.J. Bravar, A. Carney, J.N. Dufey, J.P. Evans, D. Fini, R. French, B.R. Ghidini, B. Jacholkowski, A. Kahane, J. Kinson, J.B. Kirk, A. Knudson, K. Lassalle, J.C. Lenti, V. Leruste, Ph. Francês, L.L. Loconsole, R.A. Malamant, A. Manzari, K. Narjoux, J.L. Navach, F. Palano, A. Penzo, A. Quercigh, E. Rossi, L. Sené, M. Sené, R. Stassinaki, M. Tamazouzt, M. Trainer, M.T. Vassiliadis, G. Baillie, O.V. Volte, A. Votruba, M.F. Zitoun, R.

Published
1991

7. Production of multistrange baryons and antibaryons in sulphur-tungsten interactions at 200 GeV/c per nucleon

Author

Leonardo Paolo Rossi, J. L. Narjoux, V. Lenti, K. Knudson, J. N. Carney, A. Jacholkowski, David H. Evans, R. A. Loconsole, M. Sené, Federico Antinori, Ph. Leruste, A. Malamant, W. Beusch, E. Quercigh, M. T. Trainor, M. Benayoun, F. Navach, A. Kirk, A. Bravar, R. Fini, A.K. Holme, J. Kahane, K. Šafařík, B. R. French, J. P. Dufey, A. Palano, J. C. Lassalle, D. Di Bari, S. Abatzis, L. Lima Frances, B. Ghidini, A. Volte, R. Sené, M.F. Votruba, R. P. Barnes, I. J. Bloodworth, M. Tamazouzt, J.B. Kinson, A. Penzo, O. Villalobos Baillie, Håvard Helstrup, G. Vassiliadis, and V. Manzari

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, chemistry.chemical_element, Tungsten, Sulfur, Omega, Baryon, Nuclear physics, chemistry, Cascade, Quark–gluon plasma, Rapidity, Nucleon, Particle Physics - Experiment
Abstract

Production of Ξ − and Ξ − has been observed for the first time in heavy ion interactions by the WA85 Experiment. Multistrange baryon and antibaryon production is expected to be a useful probe in the search for quark-gluon plasma formation. We describe the procedure used to select these cascade candidates and show that Ξ − and Ξ − decays can be identified. The ratio of Ξ Ξ production, corrected for geometrical acceptances and reconstruction efficiencies, is 0.39 ± 0.07 for sulphur-tungsten interactions in the central rapidity interval 2.3 Y lab p T >1.1 GeV/ c .

Published
1990

8. LAMBDA-PRODUCTION AND LAMBDA-BAR-PRODUCTION IN SULFUR TUNGSTEN INTERACTIONS AT 200 GEV/C PER NUCLEON

Author

ABATZIS, S BARNES, RP BENAYOUN, M BEUSCH, W BLOODWORTH, IJ BRAVAR, A CAPONERO, M CARNEY, JN DUFEY, JP EVANS, D FINI, R FRENCH, BR GHIDINI, B JACHOLKOWSKI, A and KAHANE, J KINSON, JB KIRK, A KNUDSON, K LASSALLE, JC and LENTI, V FRANCES, LL LERUSTE, P LOCONSOLE, RA MALAMANT, A NAVACH, F NARJOUX, JL PALANO, A PENZO, A QUERCIGH, E ROSSI, L SENE, M SENE, R STASSINAKI, M TAMAZOUZT, M TRAINOR, MT VASSILIADIS, G BAILLIE, OV VOLTE, A and VOTRUBA, MF ZITOUN, R

Published
1990

9. π±ϱ∓ production in photon-photon collisions

Author

M. Tamazouzt

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Cross section (physics), Particle physics, Photon, Meson, High Energy Physics::Phenomenology, Order (group theory), Limit (mathematics), Wave function, Helicity
Abstract

We calculate the process γγ ∗ →π ± ϱ ∓ using the Brodsky-Lepage mechanism for QCD exclusive processes, with two different types of expressions for the meson ( π , ϱ ) wave function. The predictions obtained for the various helicity terms, the angular distribution and the integrated cross section are compared with those computed for γγ ∗ →π + π − under similar assumptions. We notice that in the real photon limit ( γγ → π ± ϱ ∓ ) the reaction cross section vanishes; this appears to be a particular feature of the model used, at least at lowest order.

Published
1988
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10. The Primakoff effect at high energy

Author

M. Tamazouzt

Subjects
Quantum chromodynamics, Physics, Nuclear physics, Nuclear and High Energy Physics, High energy, Particle physics, Cross section (physics), Yield (chemistry), Compton scattering, Primakoff effect
Abstract

We calculate the processes π ± γ→π ± γ ∗ and π ± γ→ϱ ± γ ∗ , using a model based on QCD. From the first one, we derive the cross section of the Compton effect π±γ→π±γ. Considering an experiment where the above processes can be measured via the Primakoff effect, we notice that an appreciable yield may be obtained, at least for the reaction π±N→π±γN.

Published
1988
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