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Agari, M.; Amorim, A.; Aplin, S. J.; Aushev, V.; Balagura, V.; Bargiotti, M.; Barsukova, O.; Bauer, C.; Böcker, M.; Bogatyrev, A.; Bohm, G.; Bräuer, M.; Bruinsma, M.; Bruschi, M.; Conde, P.; Cruse, C.; Danielsen, K. M.; De Castro, S.; Dong, X.; Ehret, K.; Fabbri, L.; Faccioli, P.; Flammer, J.; Funcke, M.; Gellrich, A.; Gläß, J.; Goloubkov, D.; Golubkov, Y.; Golutvin, I.; Gouchtchine, O.; Gradl, W.; Grimaldi, F.; Guilitsky, Yu; Hernández, J. M.; Hofmann, W.; Hohlmann, M.; Hulsbergen, W.; Husemann, U.; Jagla, T.; Jiang, C.; Kapitza, H.; Karabekyan, S.; Khasanov, F.; Kiryushin, Yu; Kolanoski, H.; Korpar, S.; Kreuzer, P.; Križan, P.; Kupper, S.; Kvaratskheliia, T.; Lau, K.; Lewendel, B.; Lomonosov, B.; Mankel, R.; Masciocchi, S.; Medin, G.; Mevius, M.; Michetti, A.; Muresan, R.; zur Nedden, M.; Negodaev, M.; Nörenberg, M.; Nowak, S.; Ould-Saada, F.; Peralta, D.; Petersen, B. AA; Piccinini, M.; Poli, M.; Prystupa, S.; Pyrlik, J.; Reeves, K.; Riu, I.; Rybnikov, V.; Sánchez, F.; Sbrizzi, A.; Schmelling, M.; Schmidt, B.; Schwarz, A. S.; Schwenninger, B.; Schwingenheuer, B.; Sciacca, F.; Silva, L.; Sözüer, L.; Solunin, S.; Spengler, J.; Spighi, R.; Stegmann, C.; Subramania, H. S.; Titov, M.; Tsakov, I.; Uwer, U.; Vassiliev, Yu; Vukotic, I.; Wahlberg, H.; Walter, M.; Wegener, D.; Wurz, A.; Xella-Hansen, S.; Zheng, Z.; Zimmermann, R.
The European physical journal. C, Particles and fields, 04/2009, Letnik: 60, Številka: 4Journal Article
Measurements of the kinematic distributions of J / ψ mesons produced in p –C, p –Ti and p –W collisions at in the Feynman- x region −0.34< x F <0.14 and for transverse momentum up to p T =5.4 GeV/c are presented. The x F and p T dependencies of the nuclear suppression parameter, α , are also given. The results are based on 2.4×10 5 J / ψ mesons reconstructed in both the e + e − and μ + μ − decay channels. The data have been collected by the HERA-B experiment at the HERA proton ring of the DESY laboratory. The measurement explores the negative region of x F for the first time. The average value of α in the measured x F region is 0.981±0.015. The data suggest that the strong nuclear suppression of J / ψ production previously observed at high x F turns into an enhancement at negative x F .
