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19 results on '"Quintans, C."'

1. Recent gluon polarization results from COMPASS

Author

Quintans, C.

Subjects
*GLUONS, *NUCLEON-nucleon interactions, *MULTIPLICITY of hadrons, *NUCLEAR research
Abstract

One of the main goals of the COMPASS experiment at CERN is the measurement of the gluon polarization in the nucleon, ΔG, by scattering of 160 GeV/c polarized muons on a polarized 6 LiD target. This quantity is experimentally accessible via the photon-gluon fusion process, tagged either by charmed mesons production or by high hadron pairs production. The status of these two analyses is presented. Preliminary results obtained from the 2002/03 data samples on the and the channels are shown. The high hadron pairs, produced at , were also analysed, and the measured values are presented here. [Copyright &y& Elsevier]

Published
2007
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2. Latest results onJ/ψ anomalous suppression

Author

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

Abstract

Abstract: The NA50 experiment deals with Pb-Pb collisions at 158 GeV/nucleon at the CERN SPS accelerator. TheJ/ψ production is studied through the muon decay channel, using the Drell-Yan dimuons as a reference. New results based on recent analyses, from data taken with improved experimental conditions and using different centrality estimators, are presented and compared to an update of those already obtained from previous data samples. The stepwise pattern of the anomalousJ/ψ suppression as a function of centrality, already present in these previous results, is confirmed. This observation could be a fingerprint of the theoretically predicted melting of charmonia resonances in a deconfined quark-gluon plasma.

Published
2004
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3. Pseudorapidity distributions of charged particles in Pb-Pb collisions at super proton synchrotron energies from the NA50 experiment

Author

Idzik, Marek, Abreu, M., Alessandro, B., Alexa, C., Arnaldi, R., Atayan, M., Baglin, C., Baldit, A., Bedjidian, M., Beolè, S., Boldea, V., Bordalo, P., Borges, G., Bussière, A., Capelli, L., Castanier, C., Castor, J., Chaurand, B., Chevrot, I., Cheynis, B., Chiavassa, E., Cicalò, C., Claudino, T., Comets, M., Constans, N., Constantinescu, S., Cortese, P., De Falco, A., De Marco, N., Dellacasa, G., Devaux, A., Dita, S., Drapier, O., Ducroux, L., Espagnon, B., Fargeix, J., Force, P., Gallio, M., Gavrilov, Y., Gerschel, C., Giubellino, P., Golubeva, M., Gonin, M., Grigorian, A., Grigorian, S., Grossiord, J., Guber, F., Guichard, A., Gulkanyan, H., Hakobyan, R., Haroutunian, R., Idzik, M., Jouan, D., Karavitcheva, T., Kluberg, L., Kurepin, A., Le Bornee, Y., Lourenço, C., Macciotta, P., Mac Cormick, M., Marzari-Chiesa, A., Masera, M., Masoni, A., Monteno, M., Musso, A., Petiau, P., Piccotti, A., Pizzi, J., da Silva, W., Prino, F., Puddu, G., Quintans, C., Ramello, L., Ramos, S., 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., Usai, G., Vercellin, E., Villatte, L., and Willis, N.

Abstract

Abstract: We present the measurements of charged particle pseudorapidity distributions dNch/dη performed by the NA50 experiment in Pb-Pb collisions at the CERN SPS. Measurements were done at incident energies of 40 GeV (√s = 8.77 GeV) and 158 GeV (√s = 17.3 GeV) per nucleon over a broad impact parameter range. The multiplicity distributions are studied as a function of centrality using the number of participating nucleons(N part ), or the number of binary nucleon-nucleon collisions (Ncoll). Their values at midrapidity exhibit a linear scaling withN part at both energies. Particle yield increases approximately by a factor of 2 betweeny √s = 8.77 GeV and √s = 17.3 GeV.

Published
2003
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4. Study of deconfinement in NA50

Author

bordalo, Paula, Abreu, M. C., Alessandro, B., Alexa, C., Arnaldi, R., Atayan, M., Baglin, C., Baldit, A., Bedjidian, M., Beolé, S., Boldea, V., Bordalo, Paula, Borenstein, S. R., Borges, C., Bussiére, A., Capelli, L., Castagner, C., Castor, J., Chaurand, B., Cheynis, B., Chiavassa, E., Cicaló, C., Claudino, T., Comets, M. P., Constans, N., Constantinescu, S., Cortese, P., Cruz, J., De Falco, A., Dellacasa, G., De Marco, N., De vaux, 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., Grossiord, J. Y., FGuber, F., Guichard, A., Gulkanyan, H., Hakobyan, R., Haroutunian, R., Idzik, M., Jouan, D., Karavitcheva, T. L., Kluberg, L., Kurepin, A. B., Le Bornec, Y., Lourenço, C., Macciotta, P., Cormick, M. Mac, Marzari-Chiesa, A., Masera, M., Masoni, A., Monteno, M., Musso, A., Petiau, P., Piccotti, A., Pizzi, J. R., Da Silva, W. Prado, Prino, F., Puddu, G., Quintans, C., Ramos, S., Ramello, L., Mendes, P. Rato, Riccati, L., Romana, A., Saturnini, P., Santos, H., 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.

Abstract

TheJ/Ψproduction in 158 A GeV Pb-Pb interactions is studied, in the dimuon decay channel, as a function of centrality, as measured with the electromagnetic or, alternatively, with the very forward hadronic calorimeters. After a first sharp variation at mid-centrality, both patterns continue to fall down and exhibit a curvature change at high centrality values. This trend excludes any conventional hadronic model and finds a natural explanation in a deconfined quark-gluon phase scenario.

Published
2003
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5. The dependence of the anomalous J/ψsuppression on the number of participant nucleons

Author

Abreu, M.C, Alessandro, B, Alexa, C, Arnaldi, R, Atayan, M, Baglin, C, Baldit, A, Bedjidian, M, Beolè, S, Boldea, V, Bordalo, P, Borges, G, Bussière, A, Capelli, L, Castor, J, Castanier, C, Chaurand, B, Chevrot, I, Cheynis, B, Chiavassa, E, Cicalò, C, Claudino, T, Comets, M.P, Constans, N, Constantinescu, S, Cortese, P, 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, 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, Lourenço, C, Macciotta, P, 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, 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

Abstract

The observation of an anomalous J/ψsuppression in Pb–Pb collisions by the NA50 Collaboration can be considered as the most striking indication for the deconfinement of quarks and gluons at SPS energies. In this Letter, we determine the J/ψsuppression pattern as a function of the forward hadronic energy EZDCmeasured in a Zero Degree Calorimeter (ZDC). The direct connection between EZDCand the geometry of the collision allows us to calculate, within a Glauber approach, the precise relation between the number of participant nucleons Npartand EZDC. Then, we check if the experimental data can be better explained by a sudden or a smooth onset of the anomalous J/ψsuppression as a function of the number of participants.

Published
2001
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6. Charmonium production in Pb−Pb collisions

Author

De Marco, Nora, Abreu, M.C., Alessandro, B., Alexa, C., Arnaldi, R., Astruc, J., Atayan, M., Baglin, C., Baldit, A., Bedjidian, M., Bellaiche, F., Beolè, S., Boldea, V., Bordalo, P., Bussière, A., Capelli, L., Caponi, V., Casagrande, L., Castor, J., Chambon, T., Chaurand, B., Chevrot, I., Cheynis, B., Chiavassa, E., Cicalò, C., Comets, M.P., Constans, N., Constantinescu, S., Cruz, J., De Falco, A., De Marco, N., Dellacasa, G., Devaux, A., Dita, S., Drapier, O., Ducroux, L., Espagnon, B., Fargeix, J., Filippov, S.N., Fleuret, F., 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., Gulkanyan, H., Hakobyan, R., Haroutunian, R., Idzik, M., Jouan, D., Karavitcheva, T.L., Kluberg, L., Kurepin, A.B., Le Bornec, Y., Lourenço, C., Macciotta, P., Mac Cormick, M., Marzari-Chiesa, A., Masera, M., Masoni, A., Mehrabyan, S., Monteno, M., Mourgues, S., Musso, A., Ohlsson-Malek, F., Petiau, P., Piccotti, A., Pizzi, J.R., Prado da Silva, W.L., Puddu, G., Quintans, C., Racca, C., Ramello, L., Ramos, S., Rato-Mendes, P., Riccati, L., Romana, A., Ropotar, I., Saturnini, P., Scomparin, E., Serci, S., Shahoyan, R., Silva, S., Sitta, M., Soave, C., Sonderegger, P., Tarrago, X., Topilskaya, N.S., Usai, G.L., Vercellin, E., Villatte, L., and Willis, N.

Published
2000
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7. Strangeness measurements in NA50 experiment with Pb projectiles

Author

Abreu, M.C., Alessandro, B., Alexa, C., Arnaldi, R., Astruc, J., Atayan, M., Baglin, C., Baldit, A., Bedjidian, M., Bellaiche, F., Beolè, S., Boldea, V., Bordalo, P., Bussière, A., Capelli, L., Caponi, V., Casagrande, L., Castor, J., Chambon, T., Chaurand, B., Chevrot, I., Cheynis, B., Chiavassa, E., Cicalò, C., Comets, M.P., Constans, N., Constantinescu, S., Cruz, J., De Falco, A., De Marco, N., Dellacasa, G., Devaux, A., Dita, S., Drapier, O., Ducroux, L., Espagnon, B., Fargeix, J., Filippov, S.N., Fleuret, F., 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., Gulkanyan, H., Hakobyan, R., Haroutunian, R., Idzik, M., Jouan, D., Karavitcheva, T.L., Kluberg, L., Kurepin, A.B., Le Bornec, Y., Lourenço, C., Macciotta, P., Mac Cormick, M., Marzari-Chiesa, A., Masera, M., Masoni, A., Mehrabyan, S., Monteno, M., Mourgues, S., Musso, A., Ohlsson-Malek, F., Petiau, P., Piccotti, A., Pizzi, J.R., Prado da Silva, W.L., Puddu, G., Quintans, C., Racca, C., Ramello, L., Ramos, S., Rato-Mendes, P., Riccati, L., Romana, A., Ropotar, I., Saturnini, P., Scomparin, E., Serci, S., Shahoyan, R., Silva, S., Sitta, M., Soave, C., Sonderegger, P., Tarrago, X., Topilskaya, N.S., Usai, G.L., Vercellin, E., Villatte, L., and Willis, N.

Abstract

Low mass dimuons production has been studied in Pb-Pb collisions at 158 GeV/A . φ, ρand ωcontributions are extracted in different transverse mass and transverse energy domains. Preliminary results of the 1996 run display an increase of the φ/(ρ+ω)ratio, coming from an increase of the φ. Cross sections are presented and temperatures extracted.

Published
2000
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8. Transverse momentum distribution of J/ψ produced in Pb - Pb interactions at 158 GeV/c per nucleon

Author

Abreu, M.C., Alexa, C., Alessandro, B., Astruc, J., Arnaldi, R., Atayan, M., Baglin, C., Baldit, A., Bellaiche, F., Bedjidian, M., Beolè, S., Boldea, V., Bordalo, P., Bussière, A., Capony, V., Castor, J., Casagrande, L., Chambon, T., Chaurand, B., Chevrot, I., Cheynis, B., Chiavassa, E., Cicalo, C., Constantinescu, S., Comets, M.P., Cruz, J., De Falco, A., Dellacasa, G., De Marco, N., Devaux, A., Dita, S., Drapier, O., Espagnon, B., Fargeix, J., Filippov, S.N., Fleuret, F., Force, P., Gallio, M., Gavrilov, Y.K., Gerschel, C., Giubellino, P., Golubeva, M.B., Gonin, M., Grigorian, A.A., Grossiord, J.I., 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., Lourenço, C., Macciotta, P., Mac Cormick, M., Ohlsson-Malek, F., Marzari-Chiesa, A., Masera, M., Masoni, A., Mehrabyan, S., Mourgues, S., Musso, A., Petiau, P., Prado da Silva, W.L., Piccotti, A., Pizzi, J.R., Puddu, G., Quintans, C., Racca, C., Ramello, L., Ramos, S., Rato-Mendes, P., Riccati, L., Romana, A., Sartori, S., Saturnini, P., Scomparin, E., Shahoyan, R., Silva, S., Soave, C., Serci, S., Sonderegger, P., Tarrago, X., Temnikov, P., Topilskaya, N.S., Usai, G.L., Vale, C., Vercellin, E., and Willis, N.

Published
1999
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9. Dimuon enhancement in nucleus-nucleus ultrarelativistic interactions

Author

Bordalo, Paula, Abreu, M.C., Alessandro, B., Alexa, C., Arnaldi, R., Astruc, J., Atayan, M., Baglin, C., Baldit, A., Bedjidian, M., Bellaiche, F., Beole`, S., Bohrani, A., Boldea, V., Bussie`re, A., Capelli, L., Caponi, V., Casagrande, L., Castor, J., Chambon, T., Chaurand, B., Chevrot, I., Cheynis, B., Chiavassa, E., Cicalo`, C., Comets, M.P., Constans, N., Constantinescu, S., Contardo, D., Cruz, J., Falco, A. De, Marco, N. De, Dellacasa, G., Devaux, A., Dita, S., Drapier, O., Ducroux, L., Espagnon, B., Fargeix, J., Ferreira, R., Filippov, S.N., Fleuret, F., Force, P., Gallio, M., Gavrilov, Y.K., Gerschel, C., Giubellino, P., Golubeva, M.B., Gonin, M., Gorodetzky, P., Grigorian, A.A., Grossiord, J.Y., Guber, F.F., Guichard, A., Gulkanyan, H., Hakobyan, R., Haroutunian, R., Idzik, M., Jouan, D., Karavitcheva, T.L., Kluberg, L., Kossakowski, R., Kurepin, A.B., Landau, G., Bornec, Y. Le, Louren, C., Luquin, L., Macciotta, P., Cormick, M. Mac, Mandry, R., Marzari-Chiesa, A., Masera, M., Masoni, A., Mehrabyan, S., Monteno, M., Mourgues, S., Musso, A., Ohlsson-Malek, F., Petiau, P., Piccotti, A., Pizzi, J.R., Silva, W.L. Prado da, Puddu, G., Quintans, C., Racca, C., Ramello, L., Ramos, S., Rato-Mendes, P., Riccati, L., Romana, A., Ropotar, I., Saturnini, P., Scomparin, E., Serci, S., Shahoyan, R., Silva, S., Sitta, M., Soave, C., Sonderegger, P., Tarrago, X., Topilskaya, N.S., Usai, G.L., Varela, J., Vercellin, E., and Villatte, L.

Abstract

The study of muon pairs in the mass region 1.5 < M μμ < 2.5 GeV/c in 450 GeV/c p-A, 200 GeV/nucleon S-U and 158 GeV/nucleon Pb-Pb collisions is presented. In p-A interactions, the dimuon signal mass spectra are well described by a superposition of Drell-Yan and charmed meson semi-leptonic decay contributions, in agreement with previous experiments when considering a linear A dependence. In nucleus-nucleus reactions, taking only into account these two physical ingredients, a dimuon enhancement both with increasing A·B and centrality is observed.

Published
1999
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10. φ, ρ and ω production in Pb-Pb collisions at 158 GeV/c per nucleon

Author

Willis, Nicole, Abreau, M.C., Alessandro, B., Alexa, C., Arnaldi, R., Astruc, J., Atayan, M., Baglin, C., Baldit, A., Bedjidian, M., Bellaiche, F., Beole`, S., Boldea, V., Bussie`re, A., Capelli, L., Caponi, V., Casagrande, L., Castor, J., Chambon, T., Chaurand, B., Chevrot, I., Cheynis, B., Chiavassa, E., Cicalo`, C., Comets, M.P., Constans, N., Constantinescu, S., Cruz, J., Falco, A. De, Marco, N. De, Dellacasa, G., Devaux, A., Dita, S., Drapier, O., Ducroux, L., Espagnon, B., Fargeix, J., Filippov, S.N., Fleuret, F., 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., Gulkanyan, H., Hakobyan, R., Haroutunian, R., Idzik, M., Jouan, D., Karavitcheva, T.L., Kluberg, L., Kurepin, A.B., Bornec, Y. Le, Louren, C., Macciotta, P., Cormick, M. Mac, Marzari-Chiesa, A., Masera, M., Masoni, A., Mehrabyan, S., Monteno, M., Mourgues, S., Musso, A., Ohlsson-Malek, F., Petiau, P., Piccotti, A., Pizzi, J.R., Silva, W.L. Prado da, Puddu, G., Quintans, C., Racca, C., Ramello, L., Ramos, S., Rato-Mendes, P., Riccati, L., Romana, A., Ropotar, I., Saturnini, P., Scomparin, E., Serci, S., Shahoyan, R., Silva, S., Sitta, M., Soave, C., Sonderegger, P., Tarrago, X., Topilskaya, N.S., Usai, G.L., Vercellin, E., and Villatte, L.

Published
1999
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11. The elliptic flow of neutral transverse energy in heavy ion interactions at SPS energies

Author

Saturnini, Pierre, Abreu, M.C., Alessandro, B., Alexa, C., Arnaldi, R., Astruc, J., Atayan, M., Baglin, C., Baldit, A., Bedjidian, M., Bellaiche, F., Beole`, S., Boldea, V., Bordalo, P., Bussie`re, A., Capelli, L., Caponi, V., Casagrande, L., Castor, J., Chambon, T., Chaurand, B., Chevrot, I., Cheynis, B., Chiavassa, E., Cicalo`, C., Comets, M.P., Constans, N., Constantinescu, S., Cruz, J., Falco, A. De, Marco, N. De, Dellacasa, G., Devaux, A., Dita, S., Drapier, O., Ducroux, L., Espagnon, B., Fargeix, J., Filippov, S.N., Fleuret, F., 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., Gulkanyan, H., Hakobyan, R., Haroutunian, R., Idzik, M., Jouan, D., Karavitcheva, T.L., Kluberg, L., Kurepin, A.B., Bornec, Y. Le, Louren, C., Macciotta, P., Cormick, M. Mac, Marzari-Chiesa, A., Masera, M., Masoni, A., Mehrabyan, S., Monteno, M., Mourgues, S., Musso, A., Ohlsson-Malek, F., Petiau, P., Piccotti, A., Pizzi, J.R., Silva, W.L. Prado da, Puddu, G., Quintans, C., Racca, C., Ramello, L., Ramos, S., Rato-Mendes, P., Riccati, L., Romana, A., Ropotar, I., Scomparin, E., Serci, S., Shaboyan, R., Silva, S., Sitta, M., Soave, C., Sonderegger, P., Tarrago, X., Topilskaya, N.S., Usai, G.L., Vercellin, E., Villatte, L., and Willis, N.

Abstract

The threshold effect in the J/ψ suppression seen in the NA50 data in lead on lead interactions at the CERN SPS [1,2] can't be taken into account by conventional models. Other candidate models [3] use a phase transition, and therefore let suppose that the thermodynamic variables are defined everywhere that is the so-called thermalization. The in-plane elliptic flow, which has been proposed [4] in order to probe the thermalization at these beam energies, is found to be actually present in lead on lead interactions at 158A GeV/ c , but can't be observed in sulphur on sulphur at 200A GeV/ c in the NA38 data [5,6].

Published
1999
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12. Fission of lead projectiles in Pb-nucleus collisions at the SPS

Author

Abreu, M.C., Alessandro, B., Alexa, C., Arnaldi, R., Astruc, J., Atayan, M., Baglin, C., Baldit, A., Bedjidian, M., Bellaiche, F., Beole`, S., Boldea, V., Bordalo, P., Bussie`re, A., Capelli, L., Caponi, V., Casagrande, L., Castor, J., Chambon, T., Chaurand, B., Chevrot, I., Cheynis, B., Chiavassa, E., Cicalo`, C., Comets, M.P., Constans, N., Constantinescu, S., Cortese, P., Cruz, J., Falco, A. De, Marco, N. De, Dellacasa, G., Devaux, A., Dita, S., Drapier, O., Ducroux, L., Espagnon, B., Fargeix, J., Ferretti, A., Filippov, S.N., Fleuret, F., 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., Gulkanyan, H., Hakobyan, R., Haroutunian, R., Idzik, M., Jouan, D., Karavitcheva, T.L., Kluberg, L., Kurepin, A.B., Bornec, Y. Le, Louren, C., Macciotta, P., Cormick, M. Mac, Marzari-Chiesa, A., Masera, M., Masoni, A., Mehrabyan, S., Monteno, M., Mourgues, S., Musso, A., Ohlsson-Malek, F., Oppedisano, C., Petiau, P., Piccotti, A., Pizzi, J.R., Silva, W.L. Prado da, Puddu, G., Quintans, C., Racca, C., Ramello, L., Ramos, S., Rato-Mendes, P., Riccati, L., Romana, A., Ropotar, I., Saturnini, P., Scalas, E., Scomparin, E., Serci, S., Shahoyan, R., Silva, S., Sitta, M., Soave, C., Sonderegger, P., Tarrago, X., Topilskaya, N.S., Usai, G.L., Vercellin, E., Villatte, L., and Willis, N.

Published
1999
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13. Latest results from NA50 on J/ψ suppression in Pb-Pb collisions

Author

Cicalo`, Corrado, Abreu, M.C., Alessandro, B., Alexa, C., Arnaldi, R., Astruc, J., Atayan, M., Baglin, C., Baldit, A., Bedjidian, M., Bellaiche, F., Beole`, S., Boldea, V., Bordalo, P., Bussie`re, A., Capelli, L., Caponi, V., Casagrande, L., Castor, J., Chambon, T., Chaurand, B., Chevrot, I., Cheynis, B., Chiavassa, E., Comets, M.P., Constans, N., Constantinescu, S., Cruz, J., Falco, A. De, Marco, N. De, Dellacasa, G., Devaux, A., Dita, S., Drapier, O., Ducroux, L., Espagnon, B., Fargeix, J., Filippov, S.N., Fleuret, F., 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., Gulkanyan, H., Hakobyan, R., Haroutunian, R., Idzik, M., Jouan, D., Karavitcheva, T.L., Kluberg, L., Kurepin, A.B., Bornec, Y. Le, Louren, C., Macciotta, P., Cormick, M. Mac, Marzari-Chiesa, A., Masera, M., Masoni, A., Mehrabyan, S., Monteno, M., Mourgues, S., Musso, A., Ohlsson-Malek, F., Petiau, P., Piccotti, A., Pizzi, J.R., Silva, W.L. Prado da, Puddu, G., Quintans, C., Racca, C., Ramello, L., Ramos, S., Rato-Mendes, P., Riccati, L., Romana, A., Ropotar, I., Saturnini, P., Scomparin, E., Serci, S., Shahoyan, R., Silva, S., Sitta, M., Soave, C., Sonderegger, P., Tarrago, X., Topilskaya, N.S., Usai, G.L., Vercellin, E., Villatte, L., and Willis, N.

Abstract

The main goal of the NA50 experiment is to study the J/ψ suppression pattern in Pb-Pb interactions, at 158 GeV/c per nucleon at the CERN SPS. We present here the results from the 1996 (final) and 1998 (preliminary) data taking periods. They confirm and extend our previous observation that the J/ψ is anomalously suppressed from peripheral to central collisions. With new event selection procedures and different analysis techniques, we observe that in peripheral collisions the J/ψ cross section per nucleon-nucleon collision agrees with the pattern inferred from a wide range of measurements with lighter systems, from pp up to S-U. When the collisions become more central a clear departure from this behaviour is observed. The 1996 data show a sudden drop in the J/ψ production yield for E T values above 40 GeV, where E T is the neutral transverse electromagnetic energy released in the colision and measured in the EM calorimeter. The 1998 data provide a big improvement in the study of the most central region, where a second change in the pattern becomes visible.

Published
1999
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14. Calomys laucha(Rodentia, Cricetidae): growth and breeding in laboratory conditions

Author

Hodara, V. L., Espinosa, M. B., Merani, M. S., and Quintans, C.

Abstract

The husbandry and breeding of Calomys laucha(Rodentia, Cricetidae) in captivity are described. Growth curves based on body weight and length showed statistical differences between sexes after 45 days, males being heavier than females. The overall reproductive efficiency was 53·4% but birth rate was depressed during winter. Gestation length was 21±1 days and females exhibited postpartum oestrus with a 3-7 day implantation delay (51%). Litter size was 5·3×1·1 (n=34). Pup survival at weaning was 84·9%. Mean life span in laboratory conditions was 13·5 months and a cumulative mortality of 90% was reached at 27-28 months of age.

Published
1989
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