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158 results on '"Malamant, A."'

1. TALOS (Total Automation of LabVIEW Operations for Science): A framework for autonomous control systems for complex experiments

Author

Volponi, M., Zieliński, J., Rauschendorfer, T., Huck, S., Caravita, R., Auzins, M., Bergmann, B., Burian, P., Brusa, R. S., Camper, A., Castelli, F., Cerchiari, G., Ciuryło, R., Consolati, G., Doser, M., Eliaszuk, K., Giszczak, A., Glöggler, L. T., Graczykowski, Ł., Grosbart, M., Guatieri, F., Gusakova, N., Gustafsson, F., Haider, S., Janik, M. A., Januszek, T., Kasprowicz, G., Khatri, G., Kłosowski, Ł., Kornakov, G., Krumins, V., Lappo, L., Linek, A., Malamant, J., Mariazzi, S., Penasa, L., Petracek, V., Piwiński, M., Pospisil, S., Povolo, L., Prelz, F., Rangwala, S. A., Rawat, B. S., Rienäcker, B., Rodin, V., Røhne, O. M., Sandaker, H., Smolyanskiy, P., Sowiński, T., Tefelski, D., Vafeiadis, T., Welsch, C. P., Wolz, T., Zawada, M., and Zurlo, N.

Subjects
Physics - Instrumentation and Detectors, Physics - Atomic Physics
Abstract

Modern physics experiments are frequently very complex, relying on multiple simultaneous events to happen in order to obtain the desired result. The experiment control system plays a central role in orchestrating the measurement setup: However, its development is often treated as secondary with respect to the hardware, its importance becoming evident only during the operational phase. Therefore, the AEgIS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) collaboration has created a framework for easily coding control systems, specifically targeting atomic, quantum, and antimatter experiments. This framework, called Total Automation of LabVIEW Operations for Science (TALOS), unifies all the machines of the experiment in a single entity, thus enabling complex high-level decisions to be taken, and it is constituted by separate modules, called MicroServices, that run concurrently and asynchronously. This enhances the stability and reproducibility of the system while allowing for continuous integration and testing while the control system is running. The system demonstrated high stability and reproducibility, running completely unsupervised during the night and weekends of the data-taking campaigns. The results demonstrate the suitability of TALOS to manage an entire physics experiment in full autonomy: being open-source, experiments other than the AEgIS experiment can benefit from it.

Published
2024
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2. Coherent laser cooling with trains of ultrashort laser pulses

Author

Malamant, Jan, Gusakova, Natali, Sandaker, Heidi, Sorokina, Irina T., Comparat, Daniel, and Camper, Antoine

Subjects
Physics - Optics, Physics - Atomic Physics
Abstract

We propose to extend coherent laser cooling from narrow-band to broad-band transitions by using trains of ultrashort broadband pulses. We study analytically two possible methods to reduce the momentum spread of a distribution by several units of photon momentum in a single spontaneous emission lifetime. We report on numerical simulations of one-dimensional laser cooling of a two-level system with realistic parameters. The technique introduced here is of high interest for efficient laser cooling of fast species with short lifetime such as positronium.

Published
2024

3. CIRCUS: an autonomous control system for antimatter, atomic and quantum physics experiments

Author

Volponi, Marco, Huck, Saiva, Caravita, Ruggero, Zielinski, Jakub, Kornakov, Georgy, Kasprowicz, Grzegorz, Nowicka, Dorota, Rauschendorfer, Tassilo, Rienäcker, Benjamin, Prelz, Francesco, Auzins, Marcis, Bergmann, Benedikt, Burian, Petr, Brusa, Roberto Sennen, Camper, Antoine, Castelli, Fabrizio, Ciuryło, Roman, Consolati, Giovanni, Doser, Michael, Glöggler, Lisa, Graczykowski, Łukasz, Grosbart, Malgorzata, Guatieri, Francesco, Gusakova, Nataly, Gustafsson, Fredrik, Haider, Stefan, Janik, Malgorzata, Khatri, Gunn, Kłosowski, Łukasz, Krumins, Valts, Lappo, Lidia, Linek, Adam, Malamant, Jan, Mariazzi, Sebastiano, Penasa, Luca, Petracek, Vojtech, Piwiński, Mariusz, Pospisil, Stanislav, Povolo, Luca, Rangwala, Sadiqali, Rawat, Bharat, Rodin, Volodymyr, Røhne, Ole, Sandaker, Heidi, Smolyanskiy, Petr, Sowiński, Tomasz, Tefelski, Dariusz, Vafeiadis, Theodoros, Welsch, Carsten, Wolz, Tim, Zawada, Michal, and Zurlo, Nicola

Subjects
Quantum Physics, General Relativity and Quantum Cosmology, Physics - Atomic Physics, Physics - Instrumentation and Detectors
Abstract

A powerful and robust control system is a crucial, often neglected, pillar of any modern, complex physics experiment that requires the management of a multitude of different devices and their precise time synchronisation. The AEgIS collaboration presents CIRCUS, a novel, autonomous control system optimised for time-critical experiments such as those at CERN's Antiproton Decelerator and, more broadly, in atomic and quantum physics research. Its setup is based on Sinara/ARTIQ and TALOS, integrating the ALPACA analysis pipeline, the last two developed entirely in AEgIS. It is suitable for strict synchronicity requirements and repeatable, automated operation of experiments, culminating in autonomous parameter optimisation via feedback from real-time data analysis. CIRCUS has been successfully deployed and tested in AEgIS; being experiment-agnostic and released open-source, other experiments can leverage its capabilities.

Published
2024
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4. Positronium laser cooling via the $1^3S$-$2^3P$ transition with a broadband laser pulse

Author

Glöggler, L. T., Gusakova, N., Rienäcker, B., Camper, A., Caravita, R., Huck, S., Volponi, M., Wolz, T., Penasa, L., Krumins, V., Gustafsson, F., Auzins, M., Bergmann, B., Burian, P., Brusa, R. S., Castelli, F., Ciuryło, R., Comparat, D., Consolati, G., Doser, M., Graczykowski, Ł., Grosbart, M., Guatieri, F., Haider, S., Janik, M. A., Kasprowicz, G., Khatri, G., Kłosowski, Ł., Kornakov, G., Lappo, L., Linek, A., Malamant, J., Mariazzi, S., Petracek, V., Piwiński, M., Pospisil, S., Povolo, L., Prelz, F., Rangwala, S. A., Rauschendorfer, T., Rawat, B. S., Rodin, V., Røhne, O. M., Sandaker, H., Smolyanskiy, P., Sowiński, T., Tefelski, D., Vafeiadis, T., Welsch, C. P., Zawada, M., Zielinski, J., and Zurlo, N.

Subjects
Physics - Atomic Physics, High Energy Physics - Experiment
Abstract

We report on laser cooling of a large fraction of positronium (Ps) in free-flight by strongly saturating the $1^3S$-$2^3P$ transition with a broadband, long-pulsed 243 nm alexandrite laser. The ground state Ps cloud is produced in a magnetic and electric field-free environment. We observe two different laser-induced effects. The first effect is an increase in the number of atoms in the ground state after the time Ps has spent in the long-lived $3^3P$ states. The second effect is the one-dimensional Doppler cooling of Ps, reducing the cloud's temperature from 380(20) K to 170(20) K. We demonstrate a 58(9) % increase in the coldest fraction of the Ps ensemble., Comment: 6 pages, 5 figures

Published
2023

5. CIRCUS: an autonomous control system for antimatter, atomic and quantum physics experiments

Author

Volponi, M., primary, Huck, S., additional, Caravita, R., additional, Zielinski, J., additional, Kornakov, G., additional, Kasprowicz, G., additional, Nowicka, D., additional, Rauschendorfer, T., additional, Rienäcker, B., additional, Prelz, F., additional, Auzins, M., additional, Bergmann, B., additional, Burian, P., additional, Brusa, R. S., additional, Camper, A., additional, Castelli, F., additional, Ciuryło, R., additional, Consolati, G., additional, Doser, M., additional, Glöggler, L. T., additional, Graczykowski, Ł., additional, Grosbart, M., additional, Guatieri, F., additional, Gusakova, N., additional, Gustafsson, F., additional, Haider, S., additional, Janik, M., additional, Khatri, G., additional, Kłosowski, Ł., additional, Krumins, V., additional, Lappo, L., additional, Linek, A., additional, Malamant, J., additional, Mariazzi, S., additional, Penasa, L., additional, Petracek, V., additional, Piwiński, M., additional, Pospisil, S., additional, Povolo, L., additional, Rangwala, S., additional, Rawat, B. S., additional, Rodin, V., additional, Røhne, O. M., additional, Sandaker, H., additional, Smolyanskiy, P., additional, Sowiński, T., additional, Tefelski, D., additional, Vafeiadis, T., additional, Welsch, C. P., additional, Wolz, T., additional, Zawada, M., additional, and Zurlo, N., additional

Published
2024
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6. An Alexandrite Laser System for Positronium Laser Cooling

Author

Gusakova, Natali, primary, Camper, Antoine, additional, Caravita, Ruggero, additional, Penasa, Luca, additional, Glöggler, Lisa Theresa, additional, Wolz, Tim, additional, Krumins, Valts, additional, Gustafsson, Fredrik Parnefjord, additional, Huck, Saiva, additional, Volponi, Marco, additional, Rienaecker, Benjamin, additional, Khatri, Gunn, additional, Malamant, Jan, additional, Mariazzi, Sebastiano, additional, Sennen Brusa, Roberto, additional, Cabaret, Louis, additional, Comparat, Daniel Pierre, additional, and Doser, Michael, additional

Published
2024
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7. Pulsed Production of Antihydrogen in AEgIS

Author

Zurlo N., Auzins M., Bergmann B., Bonomi G., Brusa R.S., Burian P., Camper A., Castelli F., Ciury R., Consolati G., Doser M., Farricker A., Glöggler L., Graczykowski Ł., Grosbart M., Guatieri F., Gusakova N., Haider S., Huck S., Janik M., Kasprowicz G., Khatri G., Kłosowski Ł., Kornakov G., Krumins V., Lappo L., Linek A., Malamant J., Malbrunot C., Mariazzi S., Nowak L., Nowicka D., Oswald E., Pagano D., Penasa L., Piwiński M., Pospisil S., Povolo L., Prelz F., Rangwala S., Rienäcker B., Røhne O.M., Rotondi A., Sandaker H., Smolyanskiy P., Sowiński T., Tefelski D., Testera G., Volponi M., Welsch C.P., Wolz T., Zawada M., and Zielinski J.

Subjects
Physics, QC1-999
Abstract

Low-temperature antihydrogen atoms are an effective tool to probe the validity of the fundamental laws of Physics, for example the Weak Equivalence Principle (WEP) for antimatter, and -generally speaking- it is obvious that colder atoms will increase the level of precision. After the first production of cold antihydrogen in 2002 [1], experimental efforts have substantially progressed, with really competitive results already reached by adapting to cold antiatoms some well-known techniques pre- viously developed for ordinary atoms. Unfortunately, the number of antihydrogen atoms that can be produced in dedicated experiments is many orders of magnitude smaller than of hydrogen atoms, so the development of novel techniques to enhance the production of antihydrogen with well defined (and possibly controlled) conditions is essential to improve the sensitivity. We present here some experimental results achieved by the AEgIS Collaboration, based at the CERN AD (Antiproton Decelerator) on the production of antihydrogen in a pulsed mode where the production time of 90% of atoms is known with an uncertainty of ~ 250 ns [2]. The pulsed antihydrogen source is generated by the charge-exchange reaction between Rydberg positronium (Ps*) and an antiproton (p¯): p¯ + Ps* → H¯* + e−, where Ps* is produced via the implantation of a pulsed positron beam into a mesoporous silica target, and excited by two consecutive laser pulses, and antiprotons are trapped, cooled and manipulated in Penning-Malmberg traps. The pulsed production (which is a major milestone for AEgIS) makes it possible to select the antihydrogen axial temperature and opens the door for the tuning of the antihydrogen Rydberg states, their de-excitation by pulsed lasers and the manipulation through electric field gradients. In this paper, we present the results achieved by AEgIS in 2018, just before the Long Shutdown 2 (LS2), as well as some of the ongoing improvements to the system, aimed at exploiting the lower energy antiproton beam from ELENA [3].

Published
2023
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9. Search for higher twists in meson resonance production in π− N interactions atPT≥2 GeV/c

Author

Bellogianni, A., Benayoun, M., Bloodworth, I. J., Carney, J. N., Di Bari, D., Elia, D., Fini, R., French, B. R., Ghidini, B., Jacholkowski, A., Kahane, J., Kinson, J. B., Kirk, A., Knudson, K., Lenti, V., Leruste, Ph, Malamant, A., Manzari, V., Narjoux, J. -L., Navach, F., Quercigh, E., Šafařík, K., Sené, M., Sené, R., Stassinaki, M., Trainor, M. T., Vassiliadis, G., Vichou, I., Villalobos Baillie, O., Volte, A., Votruba, M. F., Zitoun, R., and WA77 Collaboration

Published
1995
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10. Study of the vector-vector final states centrally produced in pp interactions at 300 GeV/c

Author

Armstrong, T. A., Benayoun, M., Bloodworth, I. J., Carney, J. N., Evangelista, C., French, B. R., Ghidini, B., Girone, M., Jacholkowski, A., Kahane, J., Kinson, J. B., Kirk, A., Knudson, K., Lenti, V., Leruste, Ph., Malamant, A., Narjoux, J. L., Navach, F., Palano, A., Redaelli, N., Rossi, L., Sené, M., Sené, R., Stassinaki, M., Vassiliadis, G., Baillie, O. Villalobos, Votruba, M. F., Zito, G., and WA76 Collaboration

Published
1994
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11. Shape distortions of meson resonances produced in hadron interactions atP T≧2 GeV/c

Author

Bellogianni, A., Benayoun, M., Bloodworth, I. J., Carney, J. N., DiBari, D., Elia, D., Fini, R., French, B. R., Ghidini, B., Jacholkowski, A., Kahane, J., Kinson, J. B., Kirk, A., Knudson, K., Lenti, V., Leruste, Ph., Malamant, A., Manzari, V., Narjoux, J. L., Navach, F., Quercigh, E., Šařík, K., Sené, M., Sené, R., Stassinaki, M., Trainor, M. T., Vassiliadis, G., Vichou, I., Villalobos Baillie, O., Volte, A., Votruba, M. F., Zitoun, R., and WA 77 Collaboration

Published
1994
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12. Study of Φ and f2(1270) meson polarization atp T ≥2 GeV/c in π- interactions at CERN SPS

Author

Belogianni, A., Benayoun, M., Bloodworth, I. J., Carney, J. N., Di Bari, D., Elia, D., Fini, R., French, B. R., Ghidini, B., Jacholkowski, A., Kahane, J., Kinson, J. B., Kirk, A., Knudson, K., Krumstein, Z. V., Lenti, V., Leruste, Ph., Malamant, A., Manzari, V., Merekov, Yu. P., Narjoux, J. L., Navach, F., Quercigh, E., Satarik, K., Sené, M., Sené, R., Stassinaki, M., Trainor, M. T., Vassiliadis, G., Vichou, I., Villalobos Baillie, O., Volte, A., Votruba, M. F., Zitoun, Z., and WA77 Collaboration

Published
1994
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13. Study of the centrally produced ωρ0 and ωω systems inpp interactions at 300 GeV/c

Author

Armstrong, T. A., Benayoun, M., Bloodworth, I. J., Carney, J. N., Evangelista, C., French, B. R., Ghidini, B., Girone, M., Jacholkowski, A., Kahane, J., Kinson, J. B., Kirk, A., Knudson, K., Lenti, V., Leruste, Ph., Malamant, A., Narjoux, J. L., Navach, F., Palano, A., Redaelli, N., Rossi, L., Sené, M., Sené, R., Stassinaki, M., Vassiliadis, G., Baillie, O. Villalobos, Votruba, M. F., Zito, G., and WA76 Collaboration

Published
1993
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14. Transverse momentum distributions for meson resonances at central rapidity andP T≧2 GeV/c

Author

Belogianni, A., Benayoun, M., Beusch, W., Bloodworth, I. J., Carney, J. N., Di Bari, D., Evangelista, C., Fini, R., French, B. R., Ghidini, B., Jacholkowski, A., Kahane, J., Kinson, J. B., Kirk, A., Knudson, K., Lenti, V., Leruste, Ph., Malamant, A., Manzari, V., Narjoux, J. L., Navach, F., Quercigh, E., Šafařík, K., Sené, M., Sené, R., Stassinaki-Spyropoulou, M., Trainor, M. T., Vassiliadis, G., Vichou, I., Villalobos Baillie, O., Votruba, M. F., Zitoun, R., and WA 77 Collaboration

Published
1993
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15. Short-range correlations in hadron pair production atp T ≧2 GeV/c

Author

Bellogianni, A., Benayoun, M., Beusch, W., Bloodworth, I. J., Carney, J. N., Di Bari, D., Fini, R., French, B. R., Ghidini, B., Jacholkowski, A., Kahane, J., Kinson, J. B., Kirk, A., Knudson, K., Lenti, V., Leruste, Ph., Malamant, A., Narjoux, J. L., Navach, F., Palano, A., Quereigh, E., Šafařik, K., Sené, M., Sené, R., Stassinaki, M., Trainor, M. T., Vassiliadis, G., Vichou, I., Villalobos Baille, O., Volte, A., Vortruba, M. F., Zitoun, R., and WA 77 Collaboration

Published
1992
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16. Further study of theE/f 1 (1420) meson in central production

Author

Armstrong, T. A., Benayoun, M., Bloodworth, I. J., Carney, J. N., Dodenhoff, C. J., Evangelista, C., French, B. R., Ghidini, B., Girone, M., Jacholkowski, A., Kahane, J., Kinson, J. B., Kirk, A., Knudson, K., Lenti, V., Leruste, Ph., Malamant, A., Narjoux, J. L., Navach, F., Palano, A., Redaelli, N., Rossi, L., Sené, M., Sené, R., Stassinaki, M., Vassiliadis, G., Villalobos Baillie, O., Votruba, M. F., Zito, G., and WA 76 Collaboration

Published
1992
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17. Study of the centrally producer ππ andK $$\bar K$$ systems at 85 and 300 GeV/c

Author

Armstrong, T. A., Benayoun, M., Beusch, W., Bloodworth, I. J., Carney, J. N., Childs, R., Evangelista, C., French, B. R., Ghidini, B., Girone, M., Jacholkowski, A., Kahane, J., Kinson, J. B., Kirk, A., Knudson, K., Lenti, V., Leruste, Ph., Malamant, A., Narjoux, J. L., Navach, F., Palano, A., Quercigh, E., Redaelli, N., Rossi, L., Sené, M., Sené, R., Stassinaki, M., Trainor, M. T., Vassiliadis, G., Baillie, O. Villalobos, Votruba, M. F., and WA76 Collaboration

Published
1991
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18. 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

Armstrong, T. A., Benayoun, M., Beusch, W., Bloodworth, I. J., Carney, J. N., Childs, R., French, B. R., Ghidini, B., Jacholkowski, A., Kahane, J., Kinson, J. B., Kirk, A., Knudson, K., Lenti, V., Leruste, Ph., Malamant, A., Narjoux, J. L., Navach, F., Palano, A., Quercigh, E., Redaelli, N., Rossi, L., Sené, M., Sené, R., Stassinaki, M., Trainor, M. T., Vassiliadis, G., Baillie, O. Villalobos, Votruba, M. F., Zito, G., Zitoun, R., and WA 76 Collaboration

Published
1990
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19. A study of the centrally produced π+π−π0 system formed in the reactionpp→p f (π+π−π0)p s at 300 GeV/c

Author

Armstrong, T. A., Benayoun, M., Beusch, W., Bloodworth, I. J., Carney, J. N., Childs, R., Evangelista, C., French, B. R., Ghidini, B., Girone, M., Jacholkowski, A., Kahane, J., Kinson, J. B., Kirk, A., Knudson, K., Lenti, V., Leruste, Ph., Malamant, A., Narjoux, J. L., Navach, F., Palano, A., Quercigh, E., Redaelli, N., Rossi, L., Sené, M., Sené, R., Stassinaki, M., Trainor, M. T., Vassiliadis, G., Villalobos Baillie, O., Votruba, M. F., and WA 76 Collaboration

Published
1990
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20. La solidarité entre élèves : une pratique permettant une meilleure gestion de l'hétérogénéité au cycle 1

Author

Malamant, Abel, Université Paris-Sorbonne - Paris 4 - École supérieure du professorat et de l'éducation - Académie de Paris (ESPE Paris), Université Paris-Sorbonne (UP4), and Florent Pasquier

Subjects
Hétérogénéité, [SHS.EDU]Humanities and Social Sciences/Education, Coopération, Cycle 1, Solidarité
Abstract

L’hétérogénéité des classes peut entraîner des difficultés pour l'enseignant, mais est aussi une formidable ressource pour permettre l'apprentissage de tous, dès lors que les élèves font preuve de solidarité et de bienveillance. En effet, la pédagogie coopérative, pédagogie globale dont font partie le dispositif du tutorat et l’apprentissage collaboratif, responsabilise et autonomise les élèves tout autant qu'elle les amène à l'aide et à l'entraide entre pairs. Ce document résulte ainsi d'un besoin, celui d'un professeur des écoles stagiaire, parfois démuni face à sa classe, qui tente donc de se construire des outils pour permettre la réussite de l'ensemble de sa classe et d'y promouvoir le principe de solidarité. Ce travail est donc une recherche théorique ainsi qu'une analyse des pratiques ayant lieu au sein de ma classe. L'objectif est de tenter de comprendre les fondements de ces démarches ainsi que les mises en place possibles, tout en gardant une distance critique afin de permettre leurs améliorations futures.

Published
2016

21. 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
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22. 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
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23. 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
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24. 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
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25. 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
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26. 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
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27. 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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28. 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
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29. 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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30. 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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31. 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
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32. 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
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33. 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
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34. 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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35. 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
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36. Search for higher twists in meson resonance production in hadron interactions at p$_{T}$ $\geq$ 2 GeV/c

Author

Bellogianni, A., Benayoun, M., Bloodworth, I J., Carney, J N., Di Bari, D., Elia, D., Fini, R A., French, B R., Ghidini, B., Jacholkowski, A., Kahane, J., Kinson, J B., Kirk, A., Knudson, K P., Lenti, V., Leruste, P J., Malamant, A., Manzari, V., Narjoux, J L., Navach, F., Quercigh, E., Safarik, K., Sene, M., Sene, R., Stassinaki, M., Trainor, M T., Vasileiadis, G., Vichou, I., Villalobos Baillie, O., Volte, A., Votruba, M F., Zitoun, R., 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
[PHYS.HPHE] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], 0103 physical sciences, 010306 general physics, 01 natural sciences, Particle Physics - Experiment
Published
1996

37. Search for higher twists in meson resonance production in π- N interactions at PT≥2 GeV/c

Author

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

Subjects
Nuclear Theory, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Nuclear Experiment
Abstract

We study the production of meson resonance at pT≥2 GeV/c in π- 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) and K*0 (892) are found free from HT effects with a good accuracy, as expected from HT estimates and QCD sum rules. The magnitudes of the f2(1270) and ρ0 mesons signals are found larger than expected from the standard Lund (LT) Monte Carlo and from information provided by e+ e- annihilation experiments. The possible connection of these excesses with HT physics is discussed. We also report the first evidence for the production of f0(975) mesons in hadronic experiments at large pT. © 1996 Springer-Verlag.

Published
1995

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

Author

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

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{symbol} production. © 1994 Società Italiana di Fisica.

Published
1994

39. Shape distortions of meson resonances produced in hadron interactions at PT≧2 GeV/c

Author

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

Subjects
High Energy Physics::Experiment, Nuclear Experiment
Abstract

We study the shape of the invariant mass spectra of several resonances produced at PT≧2.0 GeV/c and observed through two-particle final states, namely the f2(1270), K*(892), {Mathematical expression}, K*(1430), and {Mathematical expression} mesons. The data sample comes from π- Be interactions at Plab=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. © 1994 Springer-Verlag.

Published
1994

40. Study of $\phi$ and f$_{2}$(1270) meson polarization at p$_{T}$ $\geq$ 2 GeV/c in $\pi^{-}$ Be interactions at CERN SPS

Author

Bellogianni, A, Benayoun, M, Bloodworth, Ian J, Carney, J N, Di Bari, D, Elia, D, Fini, R A, French, Bernard R, Ghidini, B, Jacholkowski, A, Kahane, J, Kinson, J B, Kirk, A, Knudson, K P, Krumshtein, Z, Lenti, V, Leruste, P J, Malamant, A, Manzari, V, Merekov, Yu P, Narjoux, J L, Navach, F, Quercigh, Emanuele, Safarík, K, Sené, M, Sené, R, Stassinaki, M, Trainor, M T, Vasileiadis, G, Vichou, I, Villalobos Baillie, O, Volte, A, Votruba, M F, Zitoun, R, Lantz, Simone, Physique Corpusculaire et Cosmologie - Collège de France (PCC), and 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)

Subjects
[PHYS.HPHE] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Particle Physics - Experiment
Published
1994

41. Production of strange and multistrange particles in sulphur-tungsten interactions at 200 GeV/c per nucleon

Author

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

Subjects
Particle Physics - Experiment
Published
1993

42. Transverse momentum distributions for meson resonances at central rapidity and PT≧2 GeV/c

Author

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

Subjects
High Energy Physics::Experiment, Nuclear Experiment
Abstract

The transverse momentum distributions for {Mathematical expression} and φ{symbol} (1020) have been studied in the pt 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 function pt-n with n∼8. A sample of simulated events from the Lund Monte Carlo in the same experimental conditions reproduces well the data. © 1993 Springer-Verlag.

Published
1993

43. Flavour correlation in pair production at high p$_{\perp}$

Author

Belogianni, A, Benayoun, M, Beusch, Werner, Bloodworth, Ian J, Carney, J N, Di Bari, D, Fini, R A, French, Bernard R, Ghidini, B, Jacholkowski, A, Kahane, J, Kinson, J B, Kirk, A, Knudson, K P, Lenti, V, Leruste, P J, Malamant, A, Narjoux, J L, Navach, F, Palano, A, Quercigh, Emanuele, Safarík, K, Sené, M, Sené, R, Stassinaki, M, Trainor, M T, Vasileiadis, G, Vichou, I, Villalobos Baillie, O, Volte, A, Votruba, M F, and Zitoun, R

Subjects
Particle Physics - Experiment
Published
1993

44. Study of the centrally produced ωρ0 and ωω systems in pp interactions at 300 GeV/c

Author

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

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 reaction pp→pf(2π+2π-2π0)ps and for ωω production in the reaction pp→pf(2π+2π-2π0)ps. However no evidence is found for ωø production in the reaction pp→pf(K+K-π+π-π0)ps. © 1993 Springer-Verlag.

Published
1993

45. Study of the centrally produced $\omega\varrho^{0}$ and $\omega\omega$ systems in pp interactions at 300 GeV/c

Author

Armstrong, T A, Benayoun, M, Bloodworth, Ian J, Carney, J N, Evangelista, C, French, Bernard R, Ghidini, B, Girone, M, Jacholkowski, A, Kahane, J, Kinson, J B, Kirk, A, Knudson, K P, Lenti, V, Leruste, P J, Malamant, A, Narjoux, J L, Navach, F, Palano, A, Redaelli, N G, Rossi, L, Sené, M, Sené, R, Stassinaki, M, Vasileiadis, G, Villalobos Baillie, O, Votruba, M F, and Zito, G

Subjects
Particle Physics - Experiment
Published
1992

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

Author

Abatzis, S. Antinori, F. Barnes, R.P. Bayes, A.C. Benayoun, M. Beusch, W. Bloodworth, I.J. Bravar, A. Carney, J.N. de la Cruz, B. Di Bari, D. Dufey, J.P. Evans, D. Fini, R. Fini, R. French, B.R. Ghidini, B. Girone, M. Helstrup, H. Holme, A.K. 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, V. Navach, F. Narjoux, J.L. Palano, A. Penzo, A. Quercigh, E. Rossi, L. Šafarik, K. Sené, M. Sené, R. Tamazouzt, M. Trainor, M.T. Vassiliadis, G. Baillie, O.V. Volte, A. Votruba, M.F.

Subjects
High Energy Physics::Phenomenology, Nuclear Theory, Nuclear Experiment
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, Kos, Λs, Λs, and Ξ-s produced in sulphurtungsten interactions at 200 GeV/c per nucleon and give the corrected ratios ΛΛ, Ξ-Λ and Ξ-/Λ. We note that our ratio Ξ-/Λ appears large in comparison to that from p p interactions. © 1992.

Published
1992

47. Further study of the E/f1 (1420) meson in central production

Author

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

Subjects
High Energy Physics::Experiment, Nuclear Experiment
Abstract

We have studied the reactions {Mathematical expression} where the {Mathematical expression} system is centrally produced, at 85 GeV/c and 300 GeV/c using the CERN Omega spectrometer. A spin-parity analysis of the KS0K±π∓ system shows the presence of a strong JPC=1++ signal which we identify as the E/f1 (1420) meson. We also find evidence for the decay E/f1(1420)→KS0KS0π0 which determines the C-parity of this state to be positive. Alternative explanations of the data have been tested and ruled out. Hence we obtain the quantum numbers of the E/f1 (1420) to be IG(JPC)=0+(1+). © 1992 Springer-Verlag.

Published
1992

48. Short-range correlations in hadron pair production at pT≧2 GeV/c

Author

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

Subjects
Nuclear Experiment
Abstract

Production of oppositely charged particle pairs at large pT 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 from π- Be interactions obtained using the CERN OMEGA spectrometer, contains events with a pair of oppositely charged particles having pT≧2 GeV/c recoiling, against a third one with pT≧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 {Mathematical expression}. 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. © 1992 Springer-Verlag.

Published
1992

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

Author

Armstrong, T A., Benayoun, M., Bloodworth, I J., Carney, J N., Evangelista, C., French, B R., Ghidini, B., Girone, M., Jacholkowski, A., Kahane, J., Kinson, J B., Kirk, A., Knudson, K P., Lenti, V., Leruste, P J., Malamant, A., Narjoux, J L., Navach, F., Palano, A., Redaelli, N G., Rossi, L., Sene, M., Sene, R., Stassinaki, M., Vasileiadis, G., Villalobos Baillie, O., Votruba, M F., Zito, G., Lantz, Simone, Taroni A., 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 WA76

Subjects
[PHYS.HPHE] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Particle Physics - Experiment
Published
1992

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

Author

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

Subjects
Particle Physics - Experiment
Published
1992

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