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8 results on '"Pizzi, J.R."'

1. ψ′ production in Pb–Pb collisions at 158 GeV/nucleon

Author

Alessandro, B., Alexa, C., Arnaldi, R., Atayan, M., Beolè, S., Boldea, V., Bordalo, P., Borges, G., Castor, J., Chaurand, B., Cheynis, B., Chiavassa, E., Cicalò, C., Comets, M.P., Constantinescu, S., Cortese, P., De Falco, A., De Marco, N., Dellacasa, G., Devaux, A., Dita, S., Drapier, O., Fargeix, J., Force, P., Gallio, M., Gerschel, C., Giubellino, P., Golubeva, M.B., Gonin, M., Grigoryan, A., Grossiord, J.Y., Guber, F.F., Guichard, A., Gulkanyan, H., Idzik, M., Jouan, D., Karavicheva, T.L., Kluberg, L., Kurepin, A.B., Le Bornec, Y., Lourenço, C., Mac Cormick, M., Marzari-Chiesa, A., Masera, M., Masoni, A., Monteno, M., Musso, A., Petiau, P., Piccotti, A., Pizzi, J.R., Prino, F., Puddu, G., Quintans, C., Ramello, L., Ramos, S., Riccati, L., Romana, A., Santos, H., Saturnini, P., Scomparin, E., Serci, S., Shahoyan, R., Sitta, M., Sonderegger, P., Tarrago, X., Topilskaya, N.S., Usai, G.L., Vercellin, E., Villatte, L., Willis, N., and The NA50 Collaboration

Published
2007
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2. J/ψ and ψ′ production and their normal nuclear absorption in proton-nucleus collisions at 400 GeV

Author

Alessandro, B., Alexa, C., Arnaldi, R., Atayan, M., Beolè, S., Boldea, V., Bordalo, P., Borges, G., Castor, J., Chaurand, B., Cheynis, B., Chiavassa, E., Cicalò, C., Comets, M.P., Constantinescu, S., Cortese, P., De Falco, A., De Marco, N., Dellacasa, G., Devaux, A., Dita, S., Fargeix, J., Force, P., Gallio, M., Gerschel, C., Giubellino, P., Golubeva, M.B., Grigoryan, A., Grossiord, J.Y., Guber, F.F., Guichard, A., Gulkanyan, H., Idzik, M., Jouan, D., Karavicheva, T.L., Kluberg, L., Kurepin, A.B., Le Bornec, Y., Lourenço, C., Mac Cormick, M., Marzari-Chiesa, A., Masera, M., Masoni, A., Monteno, M., Musso, A., Petiau, P., Piccotti, A., Pizzi, J.R., Prino, F., Puddu, G., Quintans, C., Ramello, L., Ramos, S., Riccati, L., Santos, H., Saturnini, P., Scomparin, E., Serci, S., Shahoyan, R., Sitta, M., Sonderegger, P., Tarrago, X., Topilskaya, N.S., Usai, G.L., Vercellin, E., Villatte, L., Willis, N., and The NA50 Collaboration

Published
2006
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3. $\psi^{\prime}$ production in Pb-Pb collisions at 158 GeV/nucleon

Author

Alessandro, B., Alexa, C., Arnaldi, R., Atayan, M., Beolè, S., Boldea, V., Bordalo, P., Borges, G., Castor, J., Chaurand, B., Cheynis, B., Chiavassa, E., Cicalò, C., Comets, M.P., Constantinescu, S., Cortese, P., Falco, A.De, Marco, N.De, Dellacasa, G., Devaux, A., Dita, S., Drapier, O., Fargeix, J., Force, P., Gallio, M., Gerschel, C., Giubellino, P., Golubeva, M.B., Gonin, M., Grigoryan, A., Grossiord, J.Y., Guber, F.F., Guichard, A., Gulkanyan, H., Idzik, M., Jouan, D., Karavicheva, T.L., Kluberg, L., Kurepin, A.B., Bornec, Y.Le, Lourenço, C., Cormick, M.Mac, Marzari-Chiesa, A., Masera, M., Masoni, A., Monteno, M., Musso, A., Petiau, P., Piccotti, A., Pizzi, J.R., Prino, F., Puddu, G., Quintans, C., Ramello, L., Ramos, S., Riccati, L., Romana, A., Santos, H., Saturnini, P., Scomparin, E., Serci, S., Shahoyan, R., Sitta, M., Sonderegger, P., Tarrago, X., Topilskaya, N.S., Usai, G.L., Vercellin, E., Villatte, L., and Willis, N.

Subjects
High Energy Physics::Experiment, Nuclear Experiment, Particle Physics - Experiment
Abstract

$\psi{prime}$ production is studied in Pb-Pb collisions at 158 GeV/c per nucleon incident momentum. Absolute cross-sections are measured and production rates are investigated as a function of the centrality of the collision. The results are compared with those obtained for lighter colliding systems and also for the $J/\psi$ meson produced under identical conditions. psi' production is studied in Pb-Pb collisions at 158 GeV/c per nucleon incident momentum. Absolute cross-sections are measured and production rates are investigated as a function of the centrality of the collision. The results are compared with those obtained for lighter colliding systems and also for the J/psi meson produced under identical conditions.

Published
2006

4. Results on $\psi'$ production in nucleus-nucleus collisions at CERN-SPS

Author

Sitta, M., Alessandro, B., Alexa, C., Arnaldi, R., Atayan, M., Beole, S., Boldea, V., Bordalo, P., Borges, G., Castanier, C., Castor, J., Chaurand, B., Cheynis, B., Chiavassa, E., Cicalo, C., Comets, M.P., Constantinescu, S., Cortese, P., De Falco, A., De Marco, N., Dellacasa, G., Devaux, A., Dita, S., Fargeix, J., Force, P., Gallio, M., Gerschel, C., Giubellino, P., Golubeva, M.B., Grigorian, A.A., Grigoryan, S., Guber, F.F., Guichard, A., Gulkanyan, H., Idzik, M., Jouan, D., Karavitcheva, T.L., Kluberg, L., Kurepin, A.B., Le Bornec, Y., Lourenco, C., Mac Cormick, M., Marzari-Chiesa, A., Masera, M., Masoni, A., Monteno, M., Musso, A., Petiau, P., Piccotti, A., Pizzi, J.R., Prino, F., Puddu, G., Quintans, C., Ramello, L., Ramos, S., Riccati, L., Santos, H., Saturnini, P., Scomparin, E., Serci, S., Shahoyan, R., Sigaudo, F., Sonderegger, P., Tarrago, X., Topilskaya, N.S., Usai, G.L., Vercellin, E., Villatte, L., Willis, N., and Wu, T.

Subjects
Physics::Instrumentation and Detectors, Nuclear Theory, High Energy Physics::Experiment, Nuclear Experiment, Particle Physics - Experiment
Abstract

We report results on $\psi'$ production as a function of centrality as measured by experiment NA50, at the CERN/SPS, in Pb-Pb collisions at an incident energy of 158 GeV per nucleon. We report results on $\psi'$ production as a function of centrality as measured by experiment NA50, at the CERN/SPS, in Pb-Pb collisions at an incident energy of 158 GeV per nucleon.

Published
2004

5. Recent results on anomalous J/$\psi$ suppression in Pb-Pb collisions at 158 AGeV/c

Author

Santos, Helena, Alessandro, B., Alexa, C., Arnaldi, R., Atayan, M., Baglin, C., Baldit, A., Bedjidian, M., Beole, S., Boldea, V., Bordalo, P., Borenstein, S.R., Borges, G., Bussiere, A., Capelli, L., Castanier, C., Castor, J., Chaurand, B., Cheynis, B., Chiavassa, E., Cicalo, C., Claudino, T., Comets, M.P., Constantinescu, S., Cortese, P., Cruz, J., De Falco, A., De Marco, N., Dellacasa, G., Devaux, A., Dita, S., Drapier, O., Espagnon, B., Fargeix, J., Force, P., Gallio, M., Gavrilov, Y.K., Gerschel, C., Giubellino, P., Golubeva, M.B., Gonin, M., Grigorian, A.A., Grigorian, S., Grossiord, J.Y., Guber, F.F., Guichard, A., Gulkanyan, H., Hakobyan, R., Haroutunian, R., Idzik, M., Jouan, D., Karavitcheva, T.L., Kluberg, L., Kurepin, A.B., Le Bornec, Y., Lourenco, C., Macciotta, P., Cormick, M.Mac, Marzari-Chiesa, A., Masera, M., Masoni, A., Monteno, M., Musso, A., Petiau, P., Piccotti, A., Pizzi, J.R., Prado da Silva, W.L., Prino, F., Puddu, G., Quintans, C., Ramello, L., Ramos, S., Rato Mendes, P., Riccati, L., Romana, A., Saturnini, P., Scalas, E., Scomparin, E., Serci, S., Shahoyan, R., Sigaudo, F., Sitta, M., Sonderegger, P., Tarrago, X., Topilskaya, N.S., Usai, G.L., Vercellin, E., Villatte, L., Willis, N., Wu, T., Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), ALICE, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Augé E., Tran Thanh Van J., NA50, Laboratoire d'Annecy de Physique des Particules (LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Robert, Suzanne

Subjects
[PHYS.HPHE] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], High Energy Physics - Experiment (hep-ex), [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment, Particle Physics - Experiment, High Energy Physics - Experiment
Abstract

We report our latest results on charmonium suppression as measured at the CERN-SPS in Pb-Pb interactions at an incident beam momentum of 158 GeV/c per nucleon. Preliminary results obtained from the most recent sample of data collected in year 2000 under improved experimental conditions are compared with published results. For the most peripheral Pb-Pb collisions, J/psi suppression agrees with the normal absorption measured from interactions of lighter nuclei while a steady increasing abnormal supression is observed with increasing centrality., Comment: 4 pages, Latex, 6 Postscript figures, uses moriond.sty. To be submitted to XXXVIIIth Recontres de Moriond - QCD and Hadronic Interactions, Les Arcs, 22-29 March 2003

Published
2003

6. New results on nuclear dependence of J/$\psi$ and $\psi^{\prime}$ production in 450 GeV pA collisions

Author

Abreu, M.C., Alessandro, B., Alexa, C., Arnaldi, R., Atayan, M., Baglin, C., Baldit, A., Bedjidian, M., Beole, S., Boldea, V., Bordalo, P., Borenstein, S.R., Borges, G., Bussiere, A., Capelli, L., Castanier, C., Castor, J., Chaurand, B., Cheynis, B., Chiavassa, E., Cicalo, C., Claudino, T., Comets, M.P., Constans, N., Constantinescu, S., Cortese, P., Cruz, J., De Marco, N., De Falco, A., Dellacasa, G., Devaux, A., Dita, S., Drapier, O., Espagnon, B., Fargeix, J., Force, P., Gallio, M., Gavrilov, Y.K., Gerschel, C., Giubellino, P., Golubeva, M.B., Gonin, M., Grigorian, A.A., Grigorian, S., Grossiord, J.Y., Guber, F.F., Guichard, A., Gulkanyan, H., Hakobyan, R., Haroutunian, R., Idzik, M., Jouan, D., Karavitcheva, T.L., Kluberg, L., Kurepin, A.B., Le Bornec, Y., Lourenco, C., Macciotta, P., MacCormick, M., Marzari-Chiesa, A., Masera, M., Masoni, A., Monteno, M., Musso, A., Petiau, P., Piccotti, A., Pizzi, J.R., Prado da Silva, W., Prino, F., Puddu, G., Quintans, C., Ramos, S., Ramello, L., Rato Mendes, P., Riccati, L., Romana, A., Santos, H., Saturnini, P., Scalas, E., Scomparin, E., Serci, S., Shahoyan, R., Sigaudo, F., Silva, S., Sitta, M., Sonderegger, P., Tarrago, X., Topilskaya, N.S., Usai, G.L., Vercellin, E., Villatte, L., and Willis, N.

Subjects
Nuclear Theory, High Energy Physics::Experiment, Nuclear Experiment, Particle Physics - Experiment
Abstract

To understand the reliability of the charmonia suppression as a signature of the Quark-Gluon Plasma formation in nucleus-nucleus collisions it is important first to understand the details of the production of J/$\psi$ and $\psi^{\prime}$ in pA interactions and the difference in the suppression of these two states. This report presents the results of the study by the NA50 collaboration of the J/$\psi$ and $\psi^{\prime}$ production in pA interactions at 450 GeV beam energy and its dependence on rapidity. It is shown that the $\psi^{\prime}$ suffers more suppression than the J/$\psi$, which is consistent with a similar observation made at 800 GeV beam energy by the E866/NuSea collaboration. To understand the reliability of the charmonia suppression as a signature of the Quark-Gluon Plasma formation in nucleus-nucleus collisions it is important first to understand the details of the production of J/psi and psi' in pA interactions and the difference in the suppression of these two states. This report presents the results of the study by the NA50 collaboration of the J/psi and psi' production in pA interactions at 450 GeV beam energy and its dependence on rapidity. It is shown that the psi' suffers more suppression than the J/psi, which is consistent with a similar observation made at 800 GeV beam energy by the E866/NuSea collaboration.

Published
2002

7. The onset of the anomalous J/$\psi$ suppression in Pb-Pb collisions at the CERN SPS

Author

Arnaldi, R., Abreu, M.C., Alessandro, B., Alexa, C., Atayan, M., Baglin, C., Baldit, A., Bedjidian, M., Beole, S., Boldea, V., Bordalo, P., Borenstein, S.R., Borges, G., Bussiere, A., Capelli, L., Castor, J., Castanier, C., Chaurand, B., Cheynis, B., Chiavassa, E., Cicalo, C., Claudino, T., Comets, M.P., Constans, N., Constantinescu, S., Cortese, P., Cruz, J., De Marco, N., De Falco, A., Dellacasa, G., Devaux, A., Dita, S., Drapier, O., Espagnon, B., Fargeix, J., Force, P., Gallio, M., Gavrilov, Y.K., Gerschel, C., Giubellino, P., Golubeva, M.B., Gonin, M., Grigorian, A.A., Grigorian, S., Grossiord, J.Y., Guber, F.F., Guichard, A., Gulkanyan, H., Hakobyan, R., Haroutunian, R., Idzik, M., Jouan, D., Karavitcheva, T.L., Kluberg, L., Kurepin, A.B., Bornec, Y.Le, Lourenco, C., Macciotta, P., MacCormick, M., Marzari-Chiesa, A., Masera, M., Masoni, A., Monteno, M., Musso, A., Petiau, P., Piccotti, A., Pizzi, J.R., Prado da Silva, W., Prino, F., Puddu, G., Quintans, C., Ramos, S., Ramello, L., Rato Mendes, P., Riccati, L., Romana, A., Santos, H., Saturnini, P., Scalas, E., Scomparin, E., Serci, S., Shahoyan, R., Sigaudo, F., Silva, S., Sitta, M., Sonderegger, P., Tarrago, X., Topilskaya, N.S., Usai, G.L., Vercellin, E., Villatte, L., and Willis, N.

Subjects
Nuclear Theory, High Energy Physics::Experiment, Nuclear Experiment, Particle Physics - Experiment
Abstract

The $J/\psi$ suppression observed by the NA50 experiment is one of the most striking signatures for quark gluon plasma formation in Pb-Pb collisions at 158 AGeV. The $J/\psi$ production has been studied as a function of the centrality of the collision estimated via the forward energy EZDC released in a zero degree calorimeter (ZDC). The study of the correlation between the number of participant nucleons in the collisions, Npart, and EZDC allows to check whether the $J/\psi$ suppression pattern vs. EZDC is compatible with a sudden $J/\psi$ suppression mechanism expressed as a function of Npart.

Published
2001

8. $J/\psi$ suppression in Pb-Pb collisions at CERN SPS

Author

Prino, Francesco, Abreu, M.C., Alessandro, B., Alexa, C., Arnaldi, R., Ataian, M., Baglin, C., Baldit, A., Bedjidian, M., Beole, S., Boldea, V., Bordalo, P., Bussiere, A., Capelli, L., Casagrande, L., Castor, J., Chambon, T., Chaurand, B., Chevrot, I., Cheynis, B., Chiavassa, E., Cicalo, C., Claudino, T., Comets, M.P., Constans, N., Constantinescu, S., De Marco, N., De Falco, A., Dellacasa, G., Devaux, A., Dita, S., Drapier, O., Ducroux, L., Espagnon, B., Fargeix, J., Force, P., Gallio, M., Gavrilov, Y.K., Gerschel, C., Giubellino, P., Golubeva, M.B., Gonin, M., Grigorian, A.A., Grossiord, J.Y., Guber, F.F., Guichard, A., Gulkanian, H., Hakobian, R., Haroutunian, R., Idzik, M., Jouan, D., Karavitcheva, T.L., Kluberg, L., Kurepin, A.B., Le Bornec, Y., Lourenco, C., Macciotta, P., MacCormick, M., Marzari-Chiesa, A., Masera, M., Masoni, A., Mehrabian, S., Monteno, M., Musso, A., Petiau, P., Piccotti, A., Pizzi, J.R., Puddu, G., Quintans, C., Ramos, S., Ramello, L., Rato Mendes, P., Riccati, L., Romana, A., Ropotar, I., Saturnini, P., Scomparin, E., Serci, S., Shahoian, R., Silva, S., Sitta, M., Soave, C., Sonderegger, P., Tarrago, X., Topilskaya, N.S., Usai, G.L., Vercellin, E., Villatte, L., and Willis, N.

Subjects
High Energy Physics::Lattice, High Energy Physics::Phenomenology, Nuclear Theory, High Energy Physics::Experiment, Nuclear Experiment, Particle Physics - Experiment
Abstract

The NA38 and NA50 experiments at the CERN SPS have measured charmonium production in different colliding systems with the aim of observing a phase transition from ordinary hadronic matter towards a state in which quarks and gluons are deconfined (Quark Gluon Plasma, QGP). In fact it was predicted that the J/psi yield should be suppressed in deconfined matter. The analysis of the data collected by the NA50 experiment with Pb-Pb collisions at 158 GeV/c per nucleon shows that the J/psi is anomalously suppressed in central collisions and the observed pattern can be considered as a strong indication for QGP production. The NA38 and NA50 experiments at the CERN SPS have measured charmonium production in different colliding systems with the aim of observing a phase transition from ordinary hadronic matter towards a state in which quarks and gluons are deconfined (Quark Gluon Plasma, QGP). In fact it was predicted that the J/psi yield should be suppressed in deconfined matter. The analysis of the data collected by the NA50 experiment with Pb-Pb collisions at 158 GeV/c per nucleon shows that the J/psi is anomalously suppressed in central collisions and the observed pattern can be considered as a strong indication for QGP production.

Published
2001

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