Search

Your search keyword '"J. N. Carney"' showing total 84 results
Start Over Author "J. N. Carney"
84 results on '"J. N. Carney"'

1. Hyperon production in proton-sulphur interaction at 200 GeV/c

Author

S. Abatzis, J. Ftáĉnik, V. Lenti, K. Knudson, P. Ladron de Guevara, J. Urban, N. Carrer, M. Venables, J. N. Carney, Domenico Elia, V. A. Katchanov, Federico Antinori, O. Villalobos Baillie, J. L. Narjoux, R. A. Ricci, A. V. Singovsky, A. C. Bayes, M. Morando, E. Andersen, G.F. Segato, L. Sandor, E. Quercigh, K. Šafařík, M. Sené, T.F. Thorsteinsen, A. Volte, Ph. Leruste, J. P. Davies, J. Bohm, R. Lietava, R. Sené, K.L. Norman, D. Di Bari, F. Pellegrini, Petr Zavada, K. Fanebust, Håvard Helstrup, A. Kirk, A. Jacholkowski, B. De La Cruz, W. Beusch, J.B. Kinson, G. Løvhøiden, B. Ghidini, G. Vassiliadis, J. Kahane, M. Benayoun, F. Navach, A.K. Holme, Alberto Andrighetto, M.F. Votruba, David H. Evans, V. Manzari, R. A. Loconsole, R. Fini, J. C. Lassalle, B. R. French, Ivan Kralik, and P. Sennels

Subjects
Physics, Nuclear and High Energy Physics, Strange quark, High Energy Physics::Phenomenology, Hyperon, General Physics and Astronomy, Elementary particle, Lambda baryon, Xi baryon, Nuclear physics, Baryon, Strange matter, Transverse mass, Nuclear Experiment
Abstract

The WA94 collaboration uses the production of strange and anti-strange particles to investigate the properties of hot hadronic matter created in heavy-ion interactions. Λ,\(\bar \Lambda \), Ξ− and\(\bar \Xi ^ + \) particle yields and transverse mass spectra are presented for pS interactions and are compared with those for SS interactions and for the pW and SW interactions of WA85.

Published
1996
Full Text
View/download PDF

2. Strangeness production in p+W and S+W Interactions at 200 A GeV/c

Author

David H. Evans, B. R. French, Leonardo Paolo Rossi, T. Storås, R. A. Loconsole, J. C. Lassalle, W. Beusch, Ph. Leruste, M. Benayoun, F. Navach, A. Volte, R. P. Barnes, R. Sené, V. Lenti, J. L. Narjoux, M. Venables, B. Ghidini, K. Knudson, J. N. Carney, V. Manzari, Federico Antinori, R. Fini, A. C. Bayes, E. Quercigh, Håvard Helstrup, B. De La Cruz, G. Vassiliadis, J.A. Lien, A. Jacholkowski, M. Sené, K. Šafařík, S. Abatzis, A. Andrighetto, M.F. Votruba, O. Villalobos-Baillie, J. Kahane, J.B. Kinson, A.K. Holme, D. Evans, D. Di Bari, J. P. Dufey, A. Kirk, D. Elia, and J. P. Davies

Subjects
Nuclear physics, Baryon, Physics, Nuclear and High Energy Physics, High Energy Physics::Phenomenology, Nuclear Theory, Hadron, General Physics and Astronomy, Strangeness production, Transverse mass, Heavy ion, Nuclear Experiment, Spectral line
Abstract

Strange and multistrange baryon and antibaryon production is a useful probe into the dynamics of the hot hadronic matter created in central heavy ion interactions. Relative production yields and transverse mass spectra are presented and compared for pW and SW interactions.

Published
1996
Full Text
View/download PDF

3. Observation of vertex factorisation breaking in central pp interactions

Author

A.A. Kondashov, Kunio Takamatsu, Hajime Shimizu, S. Maljukov, V.D. Samoylenko, G. Tchlatchidze, David H. Evans, H. Rotscheidt, T. Nakagawa, B.C. Earl, Jean Pierre Peigneux, Yoshiji Yasu, M. Venables, B. R. French, F. Navach, Freddy Binon, V. Manzari, Alexandre A.V. Inyakin, O. Villalobos Baillie, Jean-Pierre Stroot, D. Di Bari, W. Beusch, V. Romanovsky, A. Jacholkowski, J. N. Carney, Sergey Donskov, D. Elia, Masakazu Kobayashi, G. Vassiliadis, G.V. Khaustov, Susumu Inaba, Sergey S.A. Polovnikov, B. Ghidini, Petr P.M. Shagin, A. Solovjev, V.A. Polyakov, R. Sené, Valentine Sugonyaev, A.V. Dolgopolov, D. Barberis, M. Sené, A. V. Shtannikov, Yuri Kulchitsky, A. Kirk, V. A. Lishin, Irakli Minashvili, K.L. Norman, M.F. Votruba, W. Klempt, N.A. Russakovich, J.B. Kinson, Tsuneaki Tsuru, R. A. Loconsole, A. Semenov, V. Lenti, Paolo Martinengo, Yu.D. Prokoshkin, T. Kinashi, R. A. Fini, A.V. Singovsky, and Andrey Lednev

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Factorization, Particle Physics - Experiment, Vertex (geometry)
Abstract

Central \pipi events produced in pp interactions are studied in terms of correlations between the outgoing protons. It is observed there is more $\rho^{0}$(770) and \fmeson production in reactions where the outgoing protons %fastest and slowest particles in the laboratory frame are on opposite sides of the beam. This effect is not attributable to the trigger or the experimental acceptance, and suggests that the vertices do not factorise.

Published
1996
Full Text
View/download PDF

4. Study of charged particle production using Omega RICH in WA94 experiment

Author

B. R. French, W. Beusch, A. Volte, V. Lenti, R. Sené, M. Benayoun, Ivan Kralik, Petr Zavada, R. A. Loconsole, Ph. Leruste, M. Morando, N. Carrer, S. Abatzis, F. Pellegrini, T.F. Thorsteinsen, O. Villalobos Baillie, R. A. Ricci, Federico Antinori, J. L. Narjoux, E. Andersen, V. A. Katchanov, D. Di Bari, A. C. Bayes, J.B. Kinson, B. Ghidini, A. Jacholkowski, M. Sené, Alberto Andrighetto, Vito Manzari, A. Kirk, J. C. Lassalle, R. A. Fini, D. Elia, K. Fanebust, J. Kahane, A. V. Singovsky, David H. Evans, K. Knudson, P. Ladron de Guevara, G.F. Segato, F. Navach, R. P. Barnes, J. N. Carney, E. Quercigh, J. P. Davies, L. Sandor, Roman Lietava, A.K. Holme, J. Bohm, M. Venables, Jozef Urban, K. Šafařík, Håvard Helstrup, B. De La Cruz, G. Vassiliadis, G. Løvhøiden, and M.F. Votruba

Subjects
Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Tracking (particle physics), Omega, Charged particle, Particle identification, Particle detector, Nuclear physics, Particle, High Energy Physics::Experiment, Nuclear Experiment, Nucleon, Charged particle beam, Instrumentation
Abstract

We present preliminary results about charged particle production in SS collisions at 200 GeV/ c per nucleon, obtained by WA94 experiment at CERN-SPS. The particle identification has been provided by the Omega RICH; a silicon telescope and an array of multiwire proportional chambers (MWPC) have been used to track particles to the RICH detector. Details about particle tracking and identification procedure are also reported.

Published
1996
Full Text
View/download PDF

5. Search for higher twists in meson resonance production in π− N interactions atPT≥2 GeV/c

Author

K. Šafařík, I. J. Bloodworth, A. Jacholkowski, Ph. Leruste, M.F. Votruba, D. Elia, J. Kahane, B. Ghidini, G. Vassiliadis, V. Lenti, F. Navach, M. Benayoun, K. Knudson, A. Kirk, M. Stassinaki, J. N. Carney, E. Quercigh, M. T. Trainor, M. Sené, I. Vichou, A. Malamant, D. Di Bari, R. A. Fini, J. L. Narjoux, B. R. French, J.B. Kinson, R. Zitoun, O. Villalobos Baillie, A. Volte, A. Bellogianni, R. Sené, and Vito Manzari

Subjects
Physics, Particle physics, QCD sum rules, Annihilation, Physics and Astronomy (miscellaneous), Meson, Nuclear Theory, High Energy Physics::Phenomenology, Monte Carlo method, Hadron, Omega, Nuclear physics, Quark–gluon plasma, High Energy Physics::Experiment, Twist, Nuclear Experiment
Abstract

We study the production of meson resonance atpT≥2 GeV/c inπ− Be interactions at two beam energies (150 and 300 GeV/c). The motivation is to look for the higher twist (HT) production mechanism, expected to exist besides standard hadron production through the fragmentation process of scattered quarks and gluons, the so-called leading twist (LT) mechanism. We show that the φ, K*0 (892) andK*0 (892) are found free from HT effects with a good accuracy, as expected from HT estimates and QCD sum rules. The magnitudes of thef2(1270) andρ0 mesons signals are found larger than expected from the standard Lund (LT) Monte Carlo and from information provided bye+e− annihilation experiments. The possible connection of these excesses with HT physics is discussed. We also report the first evidence for the production off0(975) mesons in hadronic experiments at largepT.

Published
1995
Full Text
View/download PDF

6. Production of strange and multistrange hyperons and antihyperons in S-W interactions at 200 GeV/c per nucleon

Author

Leonardo Paolo Rossi, A. Kirk, D. Di Bari, Håvard Helstrup, B. De La Cruz, A. C. Bayes, A. Jacholkowski, S. Abatzis, R. A. Fini, O. Villalobos Baillie, G. Vassiliadis, Vito Manzari, J. P. Davies, David H. Evans, J. Kahane, V. Lenti, J. L. Narjoux, B. Ghidini, R. P. Barnes, K. Knudson, E. Quercigh, J. N. Carney, K. Šafařík, A. Volte, F. Navach, R. Sené, Federico Antinori, A. Andrighetto, W. Beusch, J.B. Kinson, M. Benayoun, M. Sené, M.F. Votruba, J. P. Dufey, R. A. Loconsole, D. Elia, B. R. French, Ph. Leruste, A.K. Holme, J. C. Lassalle, and T. Storås

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, High Energy Physics::Phenomenology, Nuclear Theory, Hadron, Hyperon, Spectral line, Nuclear physics, Baryon, Transverse mass, High Energy Physics::Experiment, Heavy ion, Nuclear Experiment, Nucleon
Abstract

Strange and multistrange baryon and antibaryon production is a useful probe into the dynamics of the hot hadronic matter created in central heavy ion interactions. Relative production yields and transverse mass spectra are presented for Λ, Λ, Ξ− and Ξ+ hyperons produced in central sulphur-tungsten interactions at 200 GeV/c per nucleon.

Published
1995
Full Text
View/download PDF

7. A further study of the centrally produced π+π− and π+π−π+π− channels in pp interactions at 300 and 450 GeV/c

Author

Irakli Minashvili, Federico Antinori, A. Jacholkowski, N.A. Russakovich, Y. Kulchitsky, G. Vassiliadis, C. J. Dodenhoff, B. Ghidini, Paolo Martinengo, R. A. Loconsole, R. A. Fini, K.L. Norman, J. P. Davies, D. Barberis, B. R. French, G. Tchlatchidze, M.F. Votruba, V. Lenti, D. Elia, F. Navach, J.B. Kinson, A. Solovjev, O. Villalobos Baillie, A. Kirk, David H. Evans, A. Semenov, E. Quercigh, M. Sené, R. Sené, A. C. Bayes, Vito Manzari, J. N. Carney, W. Beusch, V. Romanovsky, S. Clewer, S. Maljukov, and D. Di Bari

Subjects
Physics, Crystal, Nuclear and High Energy Physics, Mass spectrum, Atomic physics, Central region, Omega, Particle Physics - Experiment
Abstract

An analysis of the centrally produced π + π − and π + π − π + π − mass spectra from the WA76 and WA91 experiments is presented, which shows that in the π + π − π + π − channel there are two new states, the f 0 (1450) and f 2 (1900). There is another new state in the π + π − channel with M = 1497 ± 30 MeV and Γ = 199 ± 30 MeV, which is compatible with the f 0 (1520) observed by the Crystal Barrel experiment. Another interpretation is discussed, where the 1450 and 1497 GeV structures are explained as being due to an interference effect between the f 0 (1365) and f 0 (1520).

Published
1995
Full Text
View/download PDF

8. Strange particle production in sulphur-sulphur interactions at 200 GeV/c per nucleon

Author

U. Mueller, Håvard Helstrup, B. De La Cruz, G. Vassiliadis, M. Morando, R. A. Loconsole, A.K. Holme, V. Manzari, K. Šafařík, A. V. Singovsky, M. Passaseo, R. Fini, A. Kirk, A. Jacholkowski, J. P. Dufey, J. C. Lassalle, V. A. Katchanov, G. Waelder, Jürgen Engelfried, Ph. Leruste, V. Lenti, K. Knudson, P. Ladron de Guevara, J. N. Carney, D. Elia, Jozef Urban, D. Di Bari, J. Kahane, K. Martens, I. J. Bloodworth, W. Beusch, J. L. Narjoux, A. Michalon, A. Bravar, M. Benayoun, F. Navach, J. Bohm, R. Sené, C. Voltolini, Alberto Andrighetto, G. Løvhøiden, G.F. Segato, E. Quercigh, G. Undheim, A. Volte, S. Abatzis, L. Šándor, F. Pellegrini, R. Blaes, Petr Zavada, B. Ghidini, J.B. Kinson, M. Sené, S. Clewer, David H. Evans, C.J. Dodenhoff, T.F. Thorsteinsen, O. Villalobos Baillie, R. A. Ricci, R. P. Barnes, A. C. Bayes, M.F. Votruba, H. W. Siebert, B. R. French, Federico Antinori, J. P. Davies, Aldo Penzo, T. Kachelhoffer, Physique Corpusculaire et Cosmologie - Collège de France (PCC), Collège de France (CdF (institution))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-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), WA94, Collège de France (CdF)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Heyd, Yvette

Subjects
Physics, Nuclear and High Energy Physics, Strange quark, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Plasma formation, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Nuclear Theory, chemistry.chemical_element, 01 natural sciences, Central region, Omega, Sulfur, Baryon, Nuclear physics, chemistry, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Transverse mass, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

Multi-strange baryon and anti-baryon 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, K o s, Λs, Λ s, and Ξ − s produced in sulphurtungsten interactions at 200 GeV/c per nucleon and give the corrected ratios Λ Λ, Ξ − Λ and Ξ − /Λ . We note that our ratio Ξ − / Λ appears large in comparison to that from p p interactions.

Published
1995
Full Text
View/download PDF

9. Results on the production of baryons with |S| = 1, 2, 3 and strange mesons in S-W collisions at 200 GeV/c per nucleon

Author

T. Storås, Domenico Di Bari, A. C. Bayes, Federico Antinori, A. Jacholkowski, R. P. Barnes, J. P. Davies, V. Manzari, Leonardo Paolo Rossi, A. Kirk, E. Quercigh, B. R. French, K. Šafařík, A. Volte, R. Sené, O. Villalobos Baillie, J. Kahane, W. Beusch, A.K. Holme, B. Ghidini, A. Andrighetto, M. Benayoun, F. Navach, Håvard Helstrup, B. De La Cruz, J. L. Narjoux, R. Fini, G. Vassiliadis, J.B. Kinson, V. Lenti, K. Knudson, J. N. Carney, J. C. Lassalle, M. Sené, David H. Evans, D. Di Bari, M.F. Votruba, J. P. Dufey, D. Elia, S. Abatzis, and Ph. Leruste

Subjects
Nuclear physics, Baryon, Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Meson, Production (computer science), Rapidity, Strangeness, Nucleon
Abstract

We report results on the production of strange baryons/antibaryons with 1, 2, and 3 units of strangeness (Λ, Ξ and Ω) and mesons (K s 0 , K + and K − ) in WA85 experiment at the CERN SPS. This experiment was designed to study the production of strange particles in central SW collisions at 200 GeV/c per nucleon, in the central rapidity region with medium to high p t . We have measured the inverse slopes of the m t distributions of such particles and the production ratios Λ /Λ, Ξ + /Ξ − , Ξ − / Λ , Ξ + / Λ , K s 0 / Λ , K s 0 / Λ , (Ω − + Ω + ) (Ξ − + Ξ + ) and K + K − . Preliminary results on the production ratios Ξ − / Λ and Ξ + / Λ in pW collisions at 200 GeV/c are also presented.

Published
1995
Full Text
View/download PDF

10. Study of the vector-vector final states centrally produced in pp interactions at 300 GeV/c

Author

M. Girone, Ph. Leruste, A. Malamant, N. G. Redaelli, I. J. Bloodworth, O. Villalobos Baillie, V. Lenti, M. Benayoun, K. Knudson, Giuseppe Zito, M. Stassinaki, J.B. Kinson, J. N. Carney, A. Jacholkowski, R. Sené, C. Evangelista, B. Ghidini, J. Kahane, F. Navach, T. A. Armstrong, B. R. French, M.F. Votruba, G. Vassiliadis, A. Palano, A. Kirk, M. Sené, Leonardo Paolo Rossi, and J. L. Narjoux

Subjects
Physics, Nuclear physics, Particle physics, Large Hadron Collider, Spectrometer
Abstract

We have performed a search for vector-vector final states centrally produced in the reaction pp→pf(VV)ps at 300 GeV/c using the CERN Ω spectrometer. Evidence is found for ωπ0, ωω, π0π0 and π+π- associated production. No evidence is found for ωϕ production.

Published
1994
Full Text
View/download PDF

11. First results from experiment WA91 at the CERN omega spectrometer

Author

Irakli Minashvili, G. Vassiliadis, D. Barberis, N.A. Russakovich, A. Solovjev, I. Vichou, A. Jacholkowski, V. Lenti, A. C. Bayes, G. Tchlatchidze, Vito Manzari, W. Beusch, V. Romanovsky, A. Semenov, Maria Girone, M. Sené, B. Ghidini, J.B. Kinson, F. Navach, R. Sené, S. Maljukov, J. N. Carney, A. Loconsole, D. Di Bari, M.F. Votruba, A. Kirk, O. Villalobos Baillie, R. P. Barnes, C. J. Dodenhoff, J. P. Davies, S. Clewer, D. Evans, E. Quercigh, R. A. Fini, Federico Antinori, and B. R. French

Subjects
Physics, Nuclear physics, Particle physics, Large Hadron Collider, Meson, Spectrometer, Omega, Central region, Particle Physics - Experiment, Bar (unit)
Abstract

Experiment WA91 searches for non-\(q\bar q\) mesons produced in the central region in the reaction pp→pf(X0)ps at 450 GeV/c using the CERN Omega Spectrometer. WA91 is a continuation of the WA76 experiment which has studied this reaction using beams of 85 and 300 GeV/c. Preliminary results from experiment WA91 are presented. In particular the X(1450) and X(1900) observed for the first time in the π+π-π+π- channel of the WA76 experiment at 300 GeV/c are confirmed by the WA91 data.

Published
1994
Full Text
View/download PDF

12. Shape distortions of meson resonances produced in hadron interactions atP T≧2 GeV/c

Author

V. Lenti, R. Zitoun, M.F. Votruba, E. Quercigh, A. Bellogianni, M. Stassinaki, B. R. French, A. Malamant, B. Ghidini, M. T. Trainor, M. Sené, A. Kirk, I. J. Bloodworth, F. Navach, D. Elia, Ph. Leruste, G. Vassiliadis, J. Kahane, R. A. Fini, K. Knudson, J. N. Carney, J. L. Narjoux, Vito Manzari, M. Benayoun, I. Vichou, A. Jacholkowski, D. DiBari, J.B. Kinson, A. Volte, R. Sené, K. Šařík, O. Villalobos Baillie, Physique Corpusculaire et Cosmologie - Collège de France (PCC), Collège de France (CdF (institution))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Lantz, Simone

Subjects
Physics, Particle physics, Large Hadron Collider, Physics and Astronomy (miscellaneous), Meson, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Hadron, 01 natural sciences, Omega, Spectral line, [PHYS.HPHE] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Nuclear physics, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], 0103 physical sciences, Quark–gluon plasma, Damping factor, High Energy Physics::Experiment, Invariant mass, Nuclear Experiment, 010306 general physics, Engineering (miscellaneous), Particle Physics - Experiment
Abstract

We study the shape of the invariant mass spectra of several resonances produced atPT≧2.0 GeV/c and observed through two-particle final states, namely thef2(1270),K*(892),\(\bar K*(892)\),K*(1430), and\(\bar K*(1430)\) mesons. The data sample comes from π− Be interactions atPlab=150 GeV/c and 300 GeV/c which have been collected using the OMEGA spectrometer at CERN. We find that although these meson resonances have their masses and widths consistent with the corresponding world average values, their shapes are all subject to the same kind of distortion: their low-mass tail is enhanced while their high-mass tail is sharply cut. This observation indicates that meson resonances produced in the fragmentation of quarks and gluons are distorted by the same damping factor in a way which preserves their masses and lifetimes.

Published
1994
Full Text
View/download PDF

13. Study of Φ and f2(1270) meson polarization atp T ≥2 GeV/c in π- interactions at CERN SPS

Author

Z. Krumstein, J. L. Narjoux, J. Kahane, M. T. Trainor, M. Sené, V. Lenti, E. Quercigh, G. Vassiliadis, A. Volte, M. Stassinaki, A. Kirk, D. Di Bari, R. Sené, Z. Zitoun, A. Malamant, B. Ghidini, R. A. Fini, A. Jacholkowski, K. Knudson, J. N. Carney, F. Navach, M. Benayoun, Vito Manzari, K. Satarik, Yu.P. Merekov, A. Belogianni, O. Villalobos Baillie, Ph. Leruste, I. Vichou, J.B. Kinson, B. R. French, D. Elia, M.F. Votruba, and I. J. Bloodworth

Subjects
Physics, Particle physics, Large Hadron Collider, Physics and Astronomy (miscellaneous), Meson, 010308 nuclear & particles physics, Parton, Polarization (waves), 01 natural sciences, Charged particle, Nuclear physics, Fragmentation (mass spectrometry), 0103 physical sciences, Transverse momentum, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Engineering (miscellaneous)
Abstract

We present the analysis of data samples taken by the WA77 experiment for π- interactions at 300 and 150 GeV/c. The trigger selects a pair of oppositely charged particles withp T ≥2 GeV/c balancing the transverse momentum of a third high-p T track. The primary aim of this experiment was the search for higher-twist production, mainly that of vector mesons. Since there are definite predictions for the polarization of mesons produced in fragmentation and through the higher-twist mechanism, we study the polarization properties of clearly identified mesons, namely the Φ and f2(1270) mesons. The results are compatible with no polarization. This can be interpreted as a production dominantly due to parton fragmentation.

Published
1994
Full Text
View/download PDF

14. Ω− signal in WA85

Author

J. P. Dufey, O. Villalobos Baillie, K. Knudson, J. N. Carney, D. Elia, Maria Girone, Leonardo Paolo Rossi, M.F. Votruba, B. De La Cruz, A. Jacholkowski, V. Lenti, S. Abatzis, A. Volte, Haavard Helstrup, J. Kahane, A. Kirk, W. Beusch, A. C. Bayes, R. Sené, A.K. Holme, B. Ghidini, M. Benayoun, Vito Manzari, R. P. Barnes, Ph Leruste, F. Navach, A. Bravar, K. Šafařík, Alberto Andrighetto, M. Sene, Federico Antinori, J. C. Lassalle, J.B. Kinson, A. Penzo, D. Di Bari, D. Evans, B. R. French, E. Quercigh, J. L. Narjoux, R. A. Fini, J. P. Davies, and G. Vassiliadis

Subjects
Physics, Nuclear and High Energy Physics, Particle decay, Branching fraction, Hadron, Analytical chemistry, Mass spectrum, Rapidity, Lambda baryon, Omega baryon, Xi baryon
Abstract

We have extracted from the full WA85 1990 data set a sample of 14ω − + ω − candidates. We describe the selection criteria, and give a measurement of the ω − /ω − ratio at central rapidity and PT > 1.6 GeV/c.

Published
1994
Full Text
View/download PDF

15. Strange particle production in sulphur-sulphur interactions at 200 per nucleon

Author

C.J. Dodenhoff, J. C. Lassalle, S. Abatzis, V. Lenti, K. Martens, A. C. Bayes, Vito Manzari, G.F. Segato, F. Pellegrini, K. Šafařík, E. Quercigh, B. R. French, R. P. Barnes, A. Kirk, J.B. Kinson, A. V. Singovsky, M.F. Votruba, A. Volte, A.K. Holme, M. Passaseo, C. Voltolini, R. Sené, Aldo Penzo, R. A. Fini, Alberto Andrighetto, A. Michalon, O. Villalobos Baillie, R. A. Ricci, H. W. Siebert, G. Undheim, T.F. Thorsteinsen, L. Sandor, A. Jacholkowski, U. Mueller, Federico Antinori, Haavard Helstrup, R. Blaes, Petr Zavada, B. De La Cruz, S. Clewer, J. P. Dufey, D. Di Bari, D. Elia, I. J. Bloodworth, R. A. Loconsole, V. A. Katchanov, A. Bravar, J-L. Narjoux, David H. Evans, M. Morando, J. Kahane, G. Waelder, G. Vassiliadis, Gunnar Løvhøiden, Jürgen Engelfried, M. Sené, K. Knudson, P. Ladron de Guevara, J. N. Carney, J. Urban, J. Bohm, W. Beusch, M. Benayoun, B. Ghidini, F. Navach, Ph Leruste, J. P. Davies, and T. Kachelhoffer

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Strange quark, chemistry, chemistry.chemical_element, Nucleon, Sulfur
Published
1994
Full Text
View/download PDF

16. New results from WA85 on multistrange hyperon production in 200 A S-W interactions

Author

Maria Girone, V. Lenti, Federico Antinori, D. Evans, J. P. Dufey, D. Elia, R. P. Barnes, D. Di Bari, W. Beusch, G. Vassiliadis, M. Benayoun, J. P. Davies, A. Volte, B. Ghidini, S. Abatzis, Haavard Helstrup, A.K. Holme, R. A. Fini, A. Bravar, B. de la Cruzy, Alberto Andrighetto, R. Sené, F. Navach, J. Kahane, M. Sene, A. C. Bayes, A. Kirk, E. Quercigh, J. C. Lassalle, Vito Manzari, A. Jacholkowski, B. R. French, M.F. Votruba, Leonardo Paolo Rossi, Karel Safarik, J.B. Kinson, A. Penzo, J. L. Narjoux, O. Villalobos Baillie, K. Knudson, Ph Leruste, and J. N. Carney

Subjects
Physics, Nuclear and High Energy Physics, Particle decay, Particle physics, Meson, Hadron, Hyperon, Lambda baryon, Omega baryon, Xi baryon, Boson
Published
1994
Full Text
View/download PDF

17. Study of the centrally produced ωρ0 and ωω systems inpp interactions at 300 GeV/c

Author

Leonardo Paolo Rossi, C. Evangelista, B. Ghidini, J. Kahane, J. L. Narjoux, V. Lenti, G. Vassiliadis, M. Sené, F. Navach, A. Palano, M. Stassinaki, K. Knudson, J. N. Carney, O. Villalobos Baillie, J.B. Kinson, T. A. Armstrong, M. Benayoun, A. Kirk, A. Jacholkowski, R. Sené, A. Malamant, Giuseppe Zito, B. R. French, N. G. Redaelli, Maria Girone, M.F. Votruba, I. J. Bloodworth, and Ph. Leruste

Subjects
Nuclear physics, Physics, Particle acceleration, Large Hadron Collider, Physics and Astronomy (miscellaneous), Proton, Spectrometer, Elementary particle, Field theory (psychology), Quantum field theory, Engineering (miscellaneous)
Abstract

We have performed a search for vector-vector final states centrally produced in proton proton interactions at 300 GeV/c using the CERN Ω spectrometer. Evidence is found for ωρ0 production in the reactionpp→p f (2π+2π−2π0)p s and for ωω production in the reactionpp→p f (2π+2π−2π0)p s . However no evidence is found for ωo production in the reactionpp→p f (K + K −π+π−π0)p s .

Published
1993
Full Text
View/download PDF

18. Transverse momentum distributions for meson resonances at central rapidity andP T≧2 GeV/c

Author

A. Kirk, G. Vassiliadis, J. Kahane, V. Lenti, E. Quercigh, M.F. Votruba, K. Knudson, I. J. Bloodworth, J. N. Carney, B. R. French, K. Šafařík, C. Evangelista, B. Ghidini, F. Navach, I. Vichou, Ph. Leruste, A. Malamant, R. A. Fini, A. Belogianni, W. Beusch, J. L. Narjoux, A. Jacholkowski, M. Benayoun, M. T. Trainor, M. Sené, D. Di Bari, R. Zitoun, R. Sené, J.B. Kinson, Vito Manzari, O. Villalobos Baillie, and M. Stassinaki-Spyropoulou

Subjects
Physics, Nuclear reaction, Particle physics, Physics and Astronomy (miscellaneous), Meson, Hadron, Quarkonium, Nuclear physics, Particle decay, Pair production, Pion, High Energy Physics::Experiment, Rapidity, Nuclear Experiment, Engineering (miscellaneous), Particle Physics - Experiment
Abstract

The transverse momentum distributions for\(\rho ^0 (770),f_2 (1270),K*^0 (892),\bar K*^0 (892)\) and ϕ (1020) have been studied in thept region between 2 and 4 GeV/c and central rapidity. The data analysed come from the WA77 experiment at CERN with a 300 GeV/c π− beam incident on a Be target. These distributions are well described by the functionpt−n withn∼8. A sample of simulated events from the Lund Monte Carlo in the same experimental conditions reproduces well the data.

Published
1993
Full Text
View/download PDF

19. Study of theπ + π − γ system centrally produced in the reactionpp→p f (π + π − γ)p s at 300 GeV/c

Author

A. Kirk, O. Villalobos Baillie, G. Vassiliadis, K. Knudson, D. Evans, J. N. Carney, Maria Girone, B. R. French, R. Sené, E. Quercigh, T. A. Armstrong, A. Palano, M. Sené, C. J. Dodenhoff, D. DiBari, J.B. Kinson, I. J. Bloodworth, V. Lenti, R. P. Barnes, W. Beusch, M. Benayoun, A. Jacholkowski, M.F. Votruba, C. Evangelista, B. Ghidini, F. Navach, and Vito Manzari

Subjects
Physics, Physics and Astronomy (miscellaneous), Branching fraction, Mass spectrum, Atomic physics, Engineering (miscellaneous)
Abstract

The reactionpp→pf(π+π−γ)ps, where theπ+π−γ system is centrally produced, has been studied at 300 GeV/c. Theπ+π−γ mass spectrum shows evidence for aρ0γ decay mode of theη′ (958) andf1 (1285). The branching ratio (f1(1285)→ηπ+π+)/(f1(1285)→ρ0γ) is found to be 5.0±0.7. No evidence is found for aρ0(770)γ decay mode of theE/f1 (1420) for which an upper limit BR (E/f1(1420)→ρ0γ)

Published
1992
Full Text
View/download PDF

20. 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
Full Text
View/download PDF

21. Study of the centrally producer ?? andK $$\bar K$$ systems at 85 and 300 GeV/c

Author

W. Beusch, M. Benayoun, R. Childs, A. Malamant, A. Jacholkowski, Ph. Leruste, K. Knudson, J.B. Kinson, B. R. French, J. N. Carney, M.F. Votruba, J. Kahane, C. Evangelista, B. Ghidini, V. Lenti, N. G. Redaelli, A. Palano, Maria Girone, A. Kirk, Leonardo Paolo Rossi, E. Quercigh, M. Stassinaki, F. Navach, T. A. Armstrong, R. Sené, I. J. Bloodworth, J. L. Narjoux, O. Villalobos Baillie, G. Vassiliadis, M. T. Trainor, and M. Sené

Subjects
Particle acceleration, Physics, Nuclear physics, Formalism (philosophy of mathematics), Large Hadron Collider, Physics and Astronomy (miscellaneous), Spectrometer, Mass spectrum, Elementary particle, Quantum field theory, Atomic physics, Engineering (miscellaneous)
Abstract

We have studied the ππ andK\(\bar K\) systems centrally produced in proton proton collisions at 300 GeV/c and π+/p proton collisions at 85 GeV/c using the CERN Ω spectrometer. Clear evidence forS*/fo(975) production is observed. An analysis performed on the π+ π− mass spectrum in the 1.0 GeV region, using a coupled channel formalism, shows that it is possible to describe theS*/fo(975) effect with one single resonance once interference of theS*/fo(975) with theS-wave background is introduced. The resultingS*/fo(975) parameters aremo=979±4MeV,gπ=0.28±0.04,gK=0.56±0.18 corresponding to a pole position on sheet II at (1001±2)−i(36±4) MeV. Evidence is also found for a structure having a mass of 1472±12 MeV and a width of 195±33 MeV.

Published
1991
Full Text
View/download PDF

22. Study of the ηπ+π− system centrally producedin the reactionpp→p f (ηπ+π−)p s at 300 GeV/c

Author

W. Beusch, M. Benayoun, I. J. Bloodworth, K. Knudson, M.F. Votruba, J. N. Carney, A. Palano, A. Jacholkowski, David H. Evans, V. Lenti, A. Kirk, D. DiBari, G. Vassiliadis, Maria Girone, O. Villalobos Baillie, T. A. Armstrong, C. J. Dodenhoff, J.B. Kinson, Vito Manzari, E. Quercigh, C. Evangelista, B. Ghidini, B. R. French, M. Sené, F. Navach, R. Sené, and R. P. Barnes

Subjects
Momentum, Pseudoscalar, Nuclear physics, Particle acceleration, Physics, Physics and Astronomy (miscellaneous), Spectrometer, Meson, Mass spectrum, Elementary particle, Engineering (miscellaneous), Omega
Abstract

The reactionpp→pf(ηπ+π−)ps where the ηπ+π− system is centrally produced has been studied at 300 GeV/c incident momentum at the CERN Ω spectrometer. The ηπ± mass spectrum shows a strong δ/a0(980) signal having a mass of 984±4 and Γ=95±14 MeV. The ηπ+π− mass spectrum shows η′ andf1(1285) signals over little background. A spin-parity analysis of the ηπ+π− system shows evidence for aJPC=1++ peak at thef1(1285) mass but no evidence for the pseudoscalar states η(1270) andl/η(1440). No evidence is found for the ηππ decay of theE/f1(1420) meson for which we set an upper limit BR(E/f1(1420)→ηππ)

Published
1991
Full Text
View/download PDF

23. 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
Full Text
View/download PDF

24. 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
Full Text
View/download PDF

25. A study of the centrally producedK *0 $$K^{*0} \bar K^{*0} $$ final state in the reactionpp→p f (K + K -π+π-)p s at 300 GeV/c

Author

V. Lenti, O. Villalobos Baillie, G. Vassiliadis, I. J. Bloodworth, M. Stassinaki, B. R. French, R. Childs, B. Ghidini, M. T. Trainor, F. Navach, M.F. Votruba, J.B. Kinson, E. Quercigh, J. Kahane, A. Jacholkowski, T. A. Armstrong, R. Sené, A. Palano, W. Beusch, M. Benayoun, K. Knudson, Leonardo Paolo Rossi, J. N. Carney, J. L. Narjoux, M. Sené, Ph. Leruste, A. Kirk, R. Zitoun, N. G. Redaelli, Giuseppe Zito, and A. Malamant

Subjects
Particle acceleration, Physics, Physics and Astronomy (miscellaneous), Production (computer science), Field theory (psychology), Elementary particle, State (functional analysis), Quantum field theory, Atomic physics, Engineering (miscellaneous), Bar (unit)
Abstract

The reactionpp→pf(K+K-π+π-)ps, where theK+K− π+π- system is centrally produced, has been studied at 300 GeV/c. TheK*0\(K^{*0} \bar K^{*0} \) final state has been observed and the cross sections for its central production are found to be the same at 300 and 85 GeV/c. TheK*0\(K^{*0} \bar K^{*0} \) final state appears to be produced as a non-resonant threshold enhancement.

Published
1990
Full Text
View/download PDF

26. A search for non-q mesons in the central region

Author

A. Malamant, I. J. Bloodworth, A. Palano, C. Evangelista, B. Ghidini, T. A. Armstrong, V. Lenti, G. Vassiliadis, F. Navach, E. Quercigh, Leonardo Paolo Rossi, A. Kirk, W. Beusch, B. R. French, R. Childs, K. Knudson, J. N. Carney, M.F. Votruba, M. Stassinaki, A. Jacholkowski, J. L. Narjoux, Ph. Leruste, M. T. Trainor, N. G. Redaelli, Maria Girone, M. Sené, J. Kahane, J.B. Kinson, O. Villalobos Baillie, R. Sené, and M. Benayoun

Subjects
Physics, Nuclear physics, Momentum, Nuclear and High Energy Physics, Particle physics, Meson, State (functional analysis), Central region, Atomic and Molecular Physics, and Optics
Abstract

The aim of this experiment is to search for non-qq mesons in the reaction pp→pf(XO)ps at 300 GeV/c incident momentum, where the XO system is a centrally produced meson. The θ/f2(1720), E/f1(1420) and a new state in the 2π+2π− channel are presented as candidate non-qq mesons.

Published
1990
Full Text
View/download PDF

27. Strangeness production in sulphur-tungsten interactions at 200 GeV/c per nucleon

Author

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

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Particle physics, Hadron, Strangeness production, Strangeness, Lambda baryon, Atomic and Molecular Physics, and Optics, Charged particle, Nuclear physics, Baryon, High Energy Physics::Experiment, Nuclear Experiment, Nucleon, Particle Physics - Experiment
Abstract

Preliminary results from the WA85 Experiment at the CERN Omega Spectrometer are presented. A 200 A GeV/c beam of 22S ions was used with a tungsten target. The apparatus is used to detect V°s and charged tracks in the range PT > 0.9 GeV/c and 2.3 Λ, Λ and cascade particles is discussed. A study of the multiplicity dependence of Λ, Λ and hadron production is presented.

Published
1990
Full Text
View/download PDF

28. 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
Full Text
View/download PDF

29. A study of the centrally produced ?+???0 system formed in the reactionpp?p f (?+???0)p s at 300 GeV/c

Author

R. Childs, M.F. Votruba, E. Quercigh, O. Villalobos Baillie, N. G. Redaelli, Maria Girone, W. Beusch, Leonardo Paolo Rossi, M. Benayoun, J. Kahane, I. J. Bloodworth, V. Lenti, A. Kirk, A. Jacholkowski, Ph. Leruste, J.B. Kinson, M. T. Trainor, J. L. Narjoux, A. Palano, M. Stassinaki, B. R. French, C. Evangelista, B. Ghidini, R. Sené, G. Vassiliadis, K. Knudson, J. N. Carney, M. Sené, A. Malamant, F. Navach, and T. A. Armstrong

Subjects
Nuclear physics, Physics, Particle acceleration, Physics and Astronomy (miscellaneous), S-wave, Mass spectrum, Dalitz plot, Field theory (psychology), Elementary particle, Atomic physics, Quantum field theory, Engineering (miscellaneous)
Abstract

The reactionpp→p f (π+π−π0)p s , where the π+π−π0 system is centrally produced, has been studied at 300 GeV/c. The π+π−π0 mass spectrum shows evidence for the η, ω anda 2 (1320) as well as an enhancement in thea 1 (1260) region. A Dalitz plot analysis of the π+π−π0 system has been performed. Thea 1 (1260) parameters coming from the fit of the 1+ S wave arem=1208±15 MeV and Γ=430±50 MeV. No evidence is found for theh 1(1170) orh 1(1380).

Published
1990
Full Text
View/download PDF

30. A kinematical selection of glueball candidates in central production

Author

O. Villalobos Baillie, V. Lenti, A.A. Kondashov, Yu.D. Prokoshkin, Sergey S.A. Polovnikov, Irakli Minashvili, A.V. Dolgopolov, Petr P.M. Shagin, A. Jacholkowski, A. Kirk, B.C. Earl, S. Maljukov, M. Sené, D. Barberis, V. Rumyantsev, A. Semenov, Valentine Sugonyaev, K. Myklebos, Sergey Donskov, Makoto Kobayashi, G.V. Khaustov, Yuri Kulchitsky, N. Russakovich, Yoshiji Yasu, David H. Evans, R. Sené, J. N. Carney, Susumu Inaba, Freddy Binon, A.V. Singovsky, H. Rotscheidt, S. A. Sadovsky, T. Nakagawa, Andrey Lednev, V.D. Samoylenko, W. Beusch, V. Romanovsky, V.A. Polyakov, G. Tchlatchidze, J.M. Olsen, Jean-Pierre Stroot, T. Kinashi, Alexandre A.V. Inyakin, T. Jacobsen, Paolo Martinengo, Jean Pierre Peigneux, M. Stassinaki, K. M. Danielsen, M. Venables, A. Solovjev, M.F. Votruba, W. Klempt, Tsuneaki Tsuru, F.E. Close, B. R. French, G. Vassiliadis, Kunio Takamatsu, K.L. Norman, H. M. Shimizu, and J.B. Kinson

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson production, Meson, Selection (relational algebra), Glueball, High Energy Physics::Lattice, Nuclear Theory, High Energy Physics::Phenomenology, Omega, Nuclear physics, Transverse momentum, Production (computer science), High Energy Physics::Experiment, Nuclear Experiment, Particle Physics - Experiment
Abstract

A study of central meson production as a function of the difference in transverse momentum ($dP_T$) of the exchanged particles shows that undisputed $q \overline q$ mesons are suppressed at small $dP_T$ whereas the glueball candidates are enhanced.

Published
1996

31. A study of cascade and strange baryon production in sulphur-sulphur interactions at 200 GeV/c per nucleon

Author

B. R. French, M. Morando, L. Šándor, F. Pellegrini, D. Elia, R. A. Loconsole, Roman Lietava, A. Kirk, V. A. Katchanov, Ph. Leruste, N. Carrer, Federico Antinori, Håvard Helstrup, B. De La Cruz, D. Di Bari, J. C. Lassalle, G. Vassiliadis, R. A. Fini, Ivan Kralik, A. V. Singovsky, J. Kahane, S. Abatzis, K. Šafařík, K. Knudson, V. Lenti, P. Ladron de Guevara, A. Jacholkowski, J. N. Carney, M.F. Votruba, F. Navach, A.K. Holme, O. Villalobos Baillie, R. A. Ricci, G. Løvhøiden, Alberto Andrighetto, G.F. Segato, E. Quercigh, J. Bohm, J. P. Davies, M. Venables, J. L. Narjoux, E. Andersen, Jozef Urban, B. Ghidini, M. Sené, A. C. Bayes, Vito Manzari, W. Beusch, M. Benayoun, David H. Evans, K. Fanebust, A. Volte, R. Sené, K.L. Norman, J.B. Kinson, Petr Zavada, and T.F. Thorsteinsen

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Spectrometer, Nuclear Theory, Omega, Spectral line, Baryon, Nuclear physics, Transverse mass, High Energy Physics::Experiment, Rapidity, Nuclear Experiment, Nucleon, Astrophysics::Galaxy Astrophysics, Particle Physics - Experiment, Nuclear Physics
Abstract

Strange and multistrange baryon and antibaryon production has been studied in sulphur sulphur interactions at 200 GeV/c per nucleon at central rapidity using the CERN Omega Spectrometer. Particle production ratios and transverse mass spectra are presented for Λ, Ξ−, Λ and Ξ−.

Published
1995

32. Λ and Ξ− production in proton-tungsten interactions at 200 GeV/c per nucleon

Author

B. R. French, Domenico Di Bari, A. Volte, J. P. Dufey, D. Elia, R. Sené, Federico Antinori, J. L. Narjoux, Ph. Leruste, S. Abatzis, J. Kahane, V. Lenti, B. Ghidini, K. Šafařík, A. C. Bayes, J. P. Davies, Haavard Helstrup, Vito Manzari, M. Sene, F. Navach, J.B. Kinson, A. Jacholkowski, A. Kirk, Leonardo Paolo Rossi, J. C. Lassalle, B. De La Cruz, T. Storȧȧs, K. Knudson, J. N. Carney, M.F. Votruba, A.K. Holme, R. A. Fini, D. Evans, G. Vassiliadis, E. Quercigh, O. Villalobos Baillie, R. P. Barnes, W. Beusch, M. Benayoun, and Alberto Andrighetto

Subjects
Nuclear physics, Physics, Baryon, Particle physics, Hadron, Hyperon, Rapidity, Strangeness, Lambda baryon, Nucleon, Xi baryon
Abstract

The primary aim of the WA85 experiment is the study of strange and multistrange baryon and anti‐baryon production. Particles are detected in the kinematic window of central rapidity and pT≳1.0 GeV/c. Results on the production of Λ, Λ,Ξ− and Ξ− hyperons in proton‐tungsten interactions from the 1990 run are presented and compared with the sulphur‐tungsten data.

Published
1995
Full Text
View/download PDF

33. Review of strange particle production from the WA85 Collaboration

Author

E. Quercigh, R. P. Barnes, Alberto Andrighetto, S. Abatzis, K. Šafařrík, B. R. French, J. C. Lassale, M. Sene, W. Beusch, O. Villalobos Baillie, J. Kahane, T. Storås, A.K. Holme, A. C. Bayes, M. Benayoun, G. Vassiliadis, Federico Antinori, Vito Manzari, Ph Leruste, J. P. Dufey, R. A. Fini, V. Lenti, D. Elia, B. Ghidini, A. Kirk, F. Navach, J. L. Narjoux, D. Di Bari, D. Evans, J. P. Davies, J.B. Kinson, A. Volte, R. Sené, A. Jacholkowski, Leonardo Paolo Rossi, B. De La Cruz, Haavard Helstrup, K. Knudson, J. N. Carney, and M.F. Votruba

Subjects
Physics, Strange quark, Plasma formation, High Energy Physics::Phenomenology, Nuclear Theory, Hyperon, Strangeness, Nuclear physics, Baryon, Mass spectrum, Particle, High Energy Physics::Experiment, Nuclear Experiment, Nucleon
Abstract

Strange and, especially, multistrange baryon and anti‐baryon production is expected to be a useful probe in the search for Quark‐Gluon Plasma formation. A review of WA85 results on strange and multistrange particle production in SW and pW interactions at 200 GeV/c per nucleons is presented. In particular, mT distributions and relative ratios are presented for Ξ−s, Ξ−s, Λs, Λs, and K0s.

Published
1995
Full Text
View/download PDF

34. Charged kaon spectra in SW interactions at 200 GeV/c per nucleon

Author

V. Lenti, J. P. Davies, W. Beusch, R. A. Fini, D. Di Bari, A. Jacholkowski, M. Benayoun, D. Evans, B. R. French, R. P. Barnes, K. Knudson, J. N. Carney, A.K. Holme, T. Storås, Ph Leruste, Haavard Helstrup, O. Villalobos Baillie, A. Volte, A. Kirk, G. Vassiliadis, Federico Antinori, R. Sené, J. C. Lassalle, K. Šafařrí, E. Quercigh, J.B. Kinson, Alberto Andrighetto, B. Ghidini, F. Navach, S. Abatzis, Leonardo Paolo Rossi, B. De La Cruz, J. P. Dufey, D. Elia, J. Kahane, A. C. Bayes, Vito Manzari, M. Sene, M.F. Votruba, and J. L. Narjoux

Subjects
Nuclear physics, Nuclear reaction, Physics, Particle physics, Meson, Branching fraction, Hadron, Mass spectrum, Elementary particle, Nucleon, Boson
Abstract

New results on the production of charged kaons in Sulphur‐Tungsten interactions have been obtained by the WA85 Collaboration. We present mt spectra for K+ and K− particles and the ratio

Published
1995
Full Text
View/download PDF

35. New results on strange and multistrange baryon production and charged kaon production in sulphur sulphur interactions at 200 GeV/c per nucleon

Author

V. Lenti, R. A. Loconsole, G.F. Segato, E. Quercigh, Petr Zavada, A. Kirk, Ph Leruste, B. De La Cruz, K. Šafařík, N. Carrer, L. Sandor, J. L. Narjoix, V. A. Katchanov, Haavard Helstrup, M.F. Votruba, R. A. Fini, B. Ghidini, G. Lo, M. Morando, D. Elia, T.F. Thorsteinsen, R. Licci, F. Navach, J. Bohm, M. Venables, K. Knudson, P. Ladron de Guevara, S. Abatzis, A. V. Singovsky, G. Vassiliadis, J. N. Carney, vho, A.K. Holme, J.B. Kinson, J. C. Lassalle, F. Pellegrini, A. Jacholkowski, D. Di Bari, D. Evans, J. Kahane, A. C. Bayes, A. Volte, Vito Manzari, R. Lietava, R. Sené, K. Fanebust, E. Andersen, Federico Antinori, B. R. French, Ivan Kralik, M. Sene, J. Urban, R. P. Barnes, W. Beusch, O. Villalobos Baillie, Alberto Andrighetto, M. Benayoun, J. P. Davies, and iden

Subjects
Physics, Particle physics, Nuclear Theory, chemistry.chemical_element, Sulfur, Omega, Charged particle, Spectral line, Baryon, Nuclear physics, chemistry, Transverse mass, High Energy Physics::Experiment, Rapidity, Nuclear Experiment, Nucleon
Abstract

Strange and multistrange baryon and antibaryon production has been studied in sulphur sulphur interactions at 200 GeV/c per nucleon at central rapidity. Particle production ratios and transverse mass spectra are presented for Λ, Ξ−, Ξ and Ξ−. In addition preliminary results on charged kaon production are presented, and the status of identified charged particle track reconstruction using the Omega RICH is reviewed.

Published
1995
Full Text
View/download PDF

36. Ω/Ξ production ratio in S-W

Author

O. Villalobos Baillie, S. Abatzis, A.K. Holme, D. Evans, B. Ghidini, F. Antinori, Alberto Andrighetto, T. Storås, R. A. Fini, R. P. Barnes, Ph. Leruste, F. Navach, A. Volte, A. Jacholkowski, J. C. Lassalle, J. P. Dufey, R. Sené, V. Lenti, W. Beusch, K. Knudson, D. Elia, J. N. Carney, M. Benayoun, E. Quercigh, Haavard Helstrup, Karel Safarik, G. Vassiliadis, J.B. Kinson, A. Kirk, Leonardo Paolo Rossi, B. De La Cruz, J. Kahane, A. C. Bayes, Vito Manzari, Federico Antinori, J. L. Narjoux, M. Sene, B. R. French, Domenico Di Bari, J. P. Davies, and M.F. Votruba

Subjects
Baryon, Nuclear physics, Nuclear reaction, Chemistry, Branching fraction, Hadron, Hyperon, Rapidity, Atomic physics, Omega baryon, Xi baryon
Abstract

We have measured the (Ω−+Ω+)/(Ξ−+Ξ+) production ratio in central S‐W collisions to be 0.8±0.4 at central rapidity and pT≳1.6 GeV/c.

Published
1995
Full Text
View/download PDF

37. First results from the 1994 lead beam run of WA97

Author

J.A. Lien, K. Fanebust, M. Dameri, M.A. Mazzoni, Federico Antinori, Erik H.M. Heijne, Leonardo Paolo Rossi, Anton Jusko, Ivan Kralik, B. R. French, Franco Meddi, P. Farthouat, T. Scognetti, Håvard Helstrup, A. Di Mauro, L. Lopez, S. Saladino, G. Vassiliadis, N. Carrer, S. Sclmane, J. Stastny, Alberto Andrighetto, S. Di Liberto, T. Virgili, A.K. Holme, M.E. Michalon-Mentzer, P. Middelkamp, H. Beker, A. Kirk, A. Volte, Jozef Urban, Paolo Martinengo, A. Pallares, S. Szafran, B. Pastirčák, Giovanni Darbo, R. Lietava, R. Sené, S. Simone, A. C. Bayes, A. Singovski, R. A. Fini, N. Armenise, C. Gemme, E. Chesi, A. Diaczek, M. T. Muciaccia, B. Sopko, V. Khodyrev, F. Pellegrini, Eugenio Cantatore, G. Romano, A. Michalon, Vito Manzari, L. Sandor, K.L. Norman, O. Villalobos Baillie, R. Blaes, Petr Zavada, B. Ghidini, R. A. Ricci, T. Reitan, G. Alexeev, J. Bán, A. Jacholkowski, E. Andersen, F. Navach, J.B. Kinson, H. Vettunen, J L. Reister, M. Morando, Ph. Leruste, I. Mácha, J. Sahagun Pareja, Dario Barberis, David H. Evans, P. Jovanovic, R. Fang, P. Sennels, B. Osculati, J. C. Lassalle, W. Geist, M. G. Catanesi, M. Sené, J. P. Davies, K. Knudson, H. Rotscheidt, T.F. Thorsteinsen, V.A. Kachanov, J. N. Carney, Gunnar Løvhøiden, F. Posa, M. Luptak, G.F. Segato, M. Vaníčková, W. Beusch, T. Kachelhoffer, Pavel Staroba, E. Quercigh, A. Inyakin, M. Benayoun, M. Pairat, Michael Campbell, D. Di Bari, J. L. Narjoux, J. Bohm, G. Grella, Michele Guida, J. Kahane, V. Lenti, T. Storaas, P. Shagin, C. Voltolini, J.M. Brom, K. Piska, J. P. Dufey, D. Elia, G. Tomasicchio, M.F. Votruba, W. Klempt, G. Rosa, Eugenio Nappi, Karel Safarik, Physique Corpusculaire et Cosmologie - Collège de France (PCC), Collège de France (CdF (institution))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-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), Heyd, Yvette, and Collège de France (CdF)-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, Silicon pixel detectors, Silicon, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Nuclear Theory, chemistry.chemical_element, 01 natural sciences, law.invention, Nuclear physics, Baryon, Telescope, Lead (geology), chemistry, law, 0103 physical sciences, Quark Gluon Plasma, Nuclear Experiment, 010306 general physics, Beam (structure)
Abstract

WA97 is designed to study strange and multi-strange baryon and anti-baryon production in 160 A GeV c PbPb collisions at the SPS with a telescope of silicon microdetectors. Four planes of silicon pixel detectors were successfully employed during the 1994 Pb run. A total of 60M central PbPb events were collected. We describe the experimental setup and report on some preliminary results from the off-line analysis.

Published
1995

38. Short-range correlations in hadron pair production at p$_{T}$ $\geq$ 2 GeV/c

Author

V. Lenti, J.B. Kinson, A. Jacholkowski, M. Stassinaki, J. Kahane, A. Kirk, G. Vassiliadis, A. Malamant, I. Vichou, B. R. French, R. A. Fini, K. Šafařík, J. L. Narjoux, B. Ghidini, W. Beusch, A. Palano, M. T. Trainor, M. Sené, F. Navach, M. Benayoun, R. Zitoun, A. Volte, E. Quereigh, R. Sené, Ph. Leruste, A. Bellogianni, K. Knudson, J. N. Carney, I. J. Bloodworth, M. F. Vortruba, O. Villalobos Baille, and D. Di Bari

Subjects
Physics, Particle physics, Physics and Astronomy (miscellaneous), Proton, Hadron, Elementary particle, Omega, Charged particle, Nuclear physics, Pair production, Rapidity, Nuclear Experiment, Nucleon, Engineering (miscellaneous), Particle Physics - Experiment
Abstract

Production of oppositely charged particle pairs at largep T is studied, where both particles, are in the central rapidity region within one unit of rapidity and nearby in azimuth. The data sample, which comes fromπ − Be interactions obtained using the CERN OMEGA spectrometer, contains events with a pair of oppositely charged particles havingp T ≧2 GeV/c recoiling, against a third one withp T ≧1 GeV/c. Our data provide new information on short range correlations involving the production of the nine possible pairs made from (π +,K +,p) and $$(\pi ^ - ,K^ - ,\bar p)$$ . Comparison with Lund Monte Carlo predictions is made. Apart from proton yields, the model reproduces correctly our data. The main discrepancies observed with protons can be attributed to hard scattering of diquarks from the target nucleons.

Published
1991

39. 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

40. Pressure-Temperature-Time Paths of Granulite Metamorphism and Uplift, Zambesi Belt, N.E. Zimbabwe

Author

C. N. Barton, M. J. Crow, Peter J. Treloar, Jane Evans, and J. N. Carney

Subjects
Craton, geography, geography.geographical_feature_category, Archean, Geochemistry, Period (geology), Metamorphism, Orogeny, Shear zone, Petrology, Granulite, Geology, Nappe
Abstract

In the Rushinga district of NE Zimbabwe at the eastern end of the Zambesi Belt two allochthonous nappes containing high pressure granulites were thrust southwards onto the northern margin of the Zimbabwe Archaean craton during the Pan-African Zambesi orogeny. Granulites in the lower sheet underwent an early granulite metamorphism associated with mylonitisation and intense ductile deformation at 12 ± 2 kb and 725–800°C. Inclusions within coarse garnets suggest that this event was preceded by an earlier higher temperature and pressure event. Subsequent uplift, documented by a variety of decompression textures, culminated in a second period of granulite metamorphism at 7 ± 2 kb and 625–700°C. These events reflect a deep crustal metamorphism early in the Zambesi orogeny, followed by re-equilibration during the upward and southward emplacement of granulite rocks within allochthonous sheets during later stages of the orogeny. The decompression textures indicate that uplift, controlled by the southward thrusting of the allochthonous granulite sheets, was accompanied by extensive unroofing, characterised by rapid erosion and/or high level continental extension.

Published
1990
Full Text
View/download PDF

41. Study of theK + K − π+ π− system centrally produced in the reactions π+ p→π+(K + K − π+ π−)p andpp→p(K + K − π+ π−)p at 85 GeV/c

Author

B. R. French, J. N. Carney, B. Ghidini, T. A. Armstrong, O. Villalobos Baillie, R. Zitoun, Giuseppe Zito, V. Lenti, I. C. Print, J.B. Kinson, A. Palano, I. J. Bloodworth, G. Vassiliadis, and M.F. Votruba

Subjects
Nuclear reaction, Physics, Crystallography, Pair production, Pion, Physics and Astronomy (miscellaneous), Meson, Branching fraction, Hadron, Vector meson, Nucleon, Engineering (miscellaneous)
Abstract

The reactions π+p→π+(K+K− π+ π−p andpp→p(K+K− π+ π−)p where the (K+K− π+ π−) system is centrally produced have been studied at 85 GeV/c. 48% of the final state proceeds through single or double vector meson resonant production i.e.,K*0(890) (37%), ϕ (4%),ρ0 (7%). Evidence is found for associatedK*0 (890)\(\bar K\)*o (890) production (6.4±1.1%) with a cross section ten times higher than that found for associated ϕ ϕ production in the same experiment.

Published
1987
Full Text
View/download PDF

42. Evidence for new states produced in the central region in the reaction pp→pf(π+π−π+π−)ps at 300 GeV/c

Author

M. T. Trainor, E. Quercigh, A. Jacholkowski, W. Beusch, O. Villalobos Baillie, Giuseppe Zito, J. Kahane, V. Lenti, M. Benayoun, Ph. Leruste, R. Sené, M. Stassinaki, A. Malamant, I. J. Bloodworth, N. G. Redaelli, T. A. Armstrong, Leonardo Paolo Rossi, R. Zitoun, B. Ghidini, J. L. Narjoux, A. Kirk, K. Knudson, A. Palano, J. N. Carney, F. Navach, M. Sené, J.B. Kinson, G. Vassiliadis, R. Childs, M.F. Votruba, and B. R. French

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Mass spectrum, Atomic physics, Central region, Particle Physics - Experiment
Abstract

The reaction pp→pf(π+π−π+π−)ps, where the π+π−π+π− system is centrally produced, has been studied at 300 GeV/c in an experiment designed to search for gluonic states. The π+π−π+π− mass spectrum shows evidence for the f1(1285) with a mass of 1281±1 MeV and a width of 31±5 MeV. In addition there is evidence for two new enhancements at masses of 1449±4 and 1901±13 MeV with widths of 78±18 and 312±61 MeV respectively. An analysis of the state at 1.45 GeV indicates that it is not a π+π−π+π− decay mode of the f1(1420) or ι η(1440) .

Published
1989
Full Text
View/download PDF

43. Observation of double φ-meson production in the central region for the reactions π+p → π+(K+K+K−K−)p andpp → p(K+K+K−K−)p at 85 GeV/c

Author

A. Palano, I. J. Bloodworth, B. Ghidini, I. C. Print, J.B. Kinson, T. A. Armstrong, M.F. Votruba, R. Zitoun, Giuseppe Zito, O. Villalobos Baillie, B. R. French, J. N. Carney, G. Vassiliadis, and V. Lenti

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Particle decay, Crystallography, Pair production, Pion, Meson, Branching fraction, Hadron, Nucleon
Abstract

The reactions π+p → π+(K+K+K−K−)p and pp → p(K+K+K−K−)p in which the K+K+K−K− system is centrally produced have been studied at 85 GeV c . Evidence is found for φφ production. The relative rates for production of φφ, φK+K− and K+K+K−K− have been determined.

Published
1986
Full Text
View/download PDF

44. Baryon antibaryon production in the central region at 85 GeV/c

Author

V. Lenti, B. R. French, A. Palano, R. Childs, G. Vassiliadis, Giuseppe Zito, M.F. Votruba, I. J. Bloodworth, B. Ghidini, J.B. Kinson, R. Zitoun, T. A. Armstrong, J. N. Carney, and O. Villalobos Baillie

Subjects
Physics, Particle physics, Physics and Astronomy (miscellaneous), Nuclear Theory, High Energy Physics::Phenomenology, Elementary particle, Lambda, Central region, Nuclear physics, Baryon, Pi, Mass spectrum, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, Engineering (miscellaneous), Particle Physics - Experiment, Bar (unit)
Abstract

In a search for glueballs and exotic states decaying into baryons and antibaryons we have investigated the production of baryon antibaryon pairs produced centrally in the reactions π+/pp → π+/p(X0)p at 85 GeV/c. In particular, channels whereX0 goes to\(p\bar p,p\bar p\pi ^ + \pi ^ - ,p\bar p2\pi ^ + 2\pi ^ - \) and\(\Lambda \bar \Lambda \) have been observed. No significant new structure is observed in the mass spectra.

Published
1987
Full Text
View/download PDF

45. Evidence for higher twist mechanisms in prompt ϱ0-meson production at PT > 2 GeV/c in 300 GeV/c Π−N interactions

Author

M. Sene, V. Lenti, M. Stassinaki, O. Villalobos Baillie, C. Neaume, J. L. Narjoux, R. Sené, J. C. Lassalle, J. Kahane, B. R. French, Z. Strachman, W. Beusch, Yves Goldschmidt-Clermont, M. Benayoun, A. Palano, M. T. Trainor, Giuseppe Zito, Gunnar Ingelman, R. Zitoun, A. Jacholkowski, I. C. Print, J.B. Kinson, K. Knudson, B. Ghidini, J. N. Carney, F. Navach, A. Malamant, M. Pimenta, Ph. Leruste, Roberto Petronzio, E. Quercigh, M.F. Votruba, A. Burns, I. J. Bloodworth, G. Vassiliadis, and H. R. Shaylor

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Meson, Scattering, Hadron, Parton, Omega, Nuclear physics, Recoil, High Energy Physics::Experiment, Twist, Nuclear Experiment
Abstract

The production of ϱ 0 mesons in hadronic interactions is investigated at high transverse momentum ( p T > 2 GeV/ c ). The data come from a sample of Π − N interactions at 300 GeV/ c obtained at the CERN OMEGA spectrometer, requiring a ϱ 0 →Π + Π − with p T (pair) > 2 GeV/ c to recoil against an opposite particle with p T (opposite) > 1 GeV/ c . The signal/(signal + background) ratio of ϱ 0 production shows an increase of 38% as x E = p T (opposite)/ p T (pair) decreases from 0.5 x E x E ⩽ 0.5. This increase is not compatible with a QCD model of parton scattering and subsequent fragmentation. It is interpreted as evidence for direct ϱ 0 production via QCD higher twist processes, in terms of which a quantitative agreement with the data is found.

Published
1987
Full Text
View/download PDF

46. Preliminary results from the WA85 experiment on Λ and gL production in 200 a GeV/C sulphur-tungsten interactions

Author

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

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Pair production, chemistry, Branching fraction, Hadron, Analytical chemistry, Mass spectrum, chemistry.chemical_element, Tungsten, Nucleon, Lambda baryon
Published
1989
Full Text
View/download PDF

47. Evidence for a resonance with spin-parity 2−

Author

M. Pratap, M. MacDermott, Ph. Gavillet, R. Zitoun, G.J. Bossen, Birmingham-CERN-Glasgow-Michigan State-ParisCollaboration, D. Teodoro, E. Quercigh, P. J. Negus, A. Burns, M. Baubillier, F. Levy, G.F. Cox, B. Y. Oh, Hugh McCann, J. M. Scarr, J. Whitmore, G. A. Smith, J.B. Kinson, U. Dore, I. J. Bloodworth, K. Knudson, J. N. Carney, M.F. Votruba, and P. F. Loverre

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Meson, High Energy Physics::Experiment, Parity (physics), Atomic physics, Nuclear Experiment
Abstract

A moments analysis of the Λp system produced forwards (t< 1 GeV2) by 8.25 GeV/c K− mesons in the reaction K−p → Λpp has been performed. Significant structure is observed in the double moments H(LMlm) describing the decay of the Λp system and the subsequent Λ decay for L ⩽ 4. This structure can be interpreted in terms of the production of a resonance of spin-parity JP = 2−, with a mass and width of 2235±50 MeV and ∼ 200 MeV, respectively. The production cross section for the Λp decay mode is ∼ 1.5 μb.

Published
1981
Full Text
View/download PDF

48. A partial-wave analysis of the K−Φ system produced in the reaction K−p → K+K−K−p at 18.5 GeV/c

Author

G. Costa, W. Beusch, D. Teodoro, G. Liguori, T. Armstrong, M. Bonesini, G. Zito, L. Perini, E. Quercigh, Y. Pons, I. J. Bloodworth, C. Evangelista, B. Ghidini, M. F. Worsell, Z. Strachman, F. Navach, R. Dolfini, J.B. Kinson, L. Mandelli, A. Palano, M. Tamborini, G. Cecchet, A. Calligarich, K. Knudson, J. N. Carney, M. Mazzanti, R. Zitoun, A. Burns, and M. Baubillier

Subjects
Physics, Nuclear and High Energy Physics, Meson, Partial wave analysis, Hadron, Omega, Charged particle, Nuclear physics, Particle decay, Pair production, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, Nucleon, Particle Physics - Experiment
Abstract

About 15 000 K−Φp events have been collected in the CERN Ω′ spectrometer. A partial-wave decomposition of the K−Φ system is performed. The 1+SO+ wave is dominant. The 0−P0+ and 2−P0+ waves are important and show resonant behaviour at ∼ 1.83 GeV (Γ ∼ 0.25 GeV) and ∼ 1.73 GeV (Γ ∼ 0.22 GeV) respectively. The first one can be interpreted as the second radial excitation of the kaon while the second one can be identified as one of the two L mesons.

Published
1983
Full Text
View/download PDF

49. A study of the low-mass pπ+π− system produced in the reaction K+p → K+pπ+π− between 7.3 and 16 GeV/c

Author

Z. Sekera, D.C. Colley, G. T. Jones, A. Grant, Fernand Grard, W. Dunwoodie, E. A. De Wolf, Yves Goldschmidt-Clermont, P. Herquet, I. R. Kenyon, F. Verbeure, Victor Henri, D. Sherratt, Guido Ciapetti, Daniel Johnson, K.M. Storr, J.B. Kinson, Andreas Stergiou, and J. N. Carney

Subjects
Momentum, Nuclear physics, Physics, Nuclear and High Energy Physics, Pomeron, Atomic physics, Low Mass
Abstract

Results are presented on an analysis of the reaction K+p → K+(pπ+π−). In I-spin of the low-mass pπ+π− enhancement is shown to be 12 and the cross section for production of pπ+π− states with mass less than 1.7 GeV is shown to be essentially independent of beam momentum. The slopes of the t distributions for various pπ+π− mass slices are determined. These results, and those from moments analyses of the pπ+π− system, are consistent with production via pomeron exchange. A partial-wave analysis, carried out with the assumption of pπ+π− production by pomeron exchange gives the contributions of the various JP states for Δπ, pϵ and pϱ decay modes of the pπ+π− system. The peak near a pπ+π− mass of 1.4 GeV is shown to be mainly Δπ in a 32− (L3 = 0) state. The peak near 1.7 GeV is about 50% Δπ and 50% pϵ. The 32− (L = 2) Δπ and 32− (L = 1) pϵ states both contribute to this peak, but 52+ (L = 1) Δπ is not strong, contrary to what might be expected.

Published
1976
Full Text
View/download PDF

50. Observation of centrally produced (1720) in the reaction at 300 GeV/c

Author

R. Childs, M.F. Votruba, A. Kirk, B. Ghidini, M. Sené, M. Stassinaki, M. Girone, G. Vassiliadis, A. Jacholkowski, V. Lenti, J. Kahane, I. J. Bloodworth, T. A. Armstrong, A. Malamant, B. R. French, M. T. Trainor, C. Evangelista, Ph. Leruste, K. Knudson, E. Quercigh, J. N. Carney, N. G. Redaelli, F. Navach, W. Beusch, John R. Woodward, M. Benayoun, J.B. Kinson, O. Villalobos Baillie, A. Palano, Leonardo Paolo Rossi, and J. L. Narjoux

Subjects
Physics, Momentum, Nuclear and High Energy Physics, Hadron, Mass spectrum, Atomic physics, Spin (physics)
Abstract

The K + K − and K S 0 K S 0 systems centrally produced in the reaction pp→p f K K p s have been studied at 300 GeV/ c incident momentum. Both the K + K − and the K S 0 K S 0 mass spectra show large resonant production. For the first time in hadron collisions, clear evidence is found for the θ f 2 (1720) with parameters m =1713±10 MeV, Γ =181±30 MeV for the K + K − decay mode and m =1706±10 MeV, Γ =104±30 MeV for the K S 0 K S 0 decay mode. A spin analysis of the K + K − spectrum shows that for the θ f 2 (1720) J P =2 + is strongly favoured while 0 + and 1 − are excluded.

Published
1989
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results