Angular distributions of leptons from J/ψ’s produced in 920 GeV fixed-target proton-nucleus collisions

A study of the angular distributions of leptons from decays of J / ψ ’s produced in p-C and p-W collisions at has been performed in the J / ψ Feynman- x region −0.34< x F 1 GeV/ c a significant dependence on the reference frame is found: the polar anisotropy is more pronounced in the Collins-Sope...

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Veröffentlicht in:	The European physical journal. C, Particles and fields Particles and fields, 2009-04, Vol.60 (4), p.517-524
Hauptverfasser:	Adams, M., Albrecht, H., Amorim, A., Aplin, S. J., Balagura, V., Barsukova, O., Bastos, J., Batista, J., Bauer, Th. S., Belkov, A., Belotelov, I., Bertin, A., Bobchenko, B., Böcker, M., Buchholz, P., Conde, P., Cruse, C., Dam, M., Danilov, M., Deppe, H., Ehret, K., Eisele, F., Emeliyanov, D., Fabbri, L., Feuerstack-Raible, M., Flammer, J., Gellrich, A., Goloubkov, D., Golutvin, I., Gouchtchine, O., Goulart, D. C., Gradl, S., Gradl, W., Guilitsky, Yu, Hernández, J. M., Hofmann, W., Hohlmann, M., Hott, T., Husemann, U., Igonkina, O., Ispiryan, M., Karabekyan, S., Karpenko, N., Keller, S., Kessler, J., Knöpfle, K. T., Kolanoski, H., Krauss, C., Kreuzer, P., Kupper, S., Lanyov, A., Lau, K., Masciocchi, S., Medin, G., Mevius, M., Mizuk, R., Muresan, R., zur Nedden, M., Negodaev, M., Nowak, S., Ouchrif, M., Pernack, R., Pestotnik, R., Petersen, B. AA, Pleier, M. A., Poli, M., Pose, D., Pugatch, V., Riu, I., Robmann, P., Rybnikov, V., Sánchez, F., Schmidt, B., Schwanke, U., Schwartz, A. J., Schwarz, A. S., Schwingenheuer, B., Solunin, S., Somov, A., Somov, S., Spengler, J., Spighi, R., Spiridonov, A., Stegmann, C., Symalla, M., Tsakov, I., Uwer, U., Villa, M., Vitale, A., Vukotic, I., Walter, M., Wang, J. J., Wegener, D., Werthenbach, U., Wolters, H., Zaitsev, Yu, Zeuner, T., Zhelezov, A., Živko, T., Zoccoli, A.
Format:	Artikel
Sprache:	eng
Schlagworte:	Anisotropy Astrofísica Astronomia Astronomy Astrophysics Astrophysics and Cosmology Collisions Dependence Elementary Particles Física nuclear Hadrons Heavy Ions Helicity Leptons Measurement Science and Instrumentation Nuclear Energy Nuclear Physics Particles (Nuclear physics) Partícules (Física nuclear) Physics Physics and Astronomy Protons Quantum Field Theories Quantum Field Theory Regular Article - Experimental Physics String Theory Teoria quàntica de camps
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Zusammenfassung:	A study of the angular distributions of leptons from decays of J / ψ ’s produced in p-C and p-W collisions at has been performed in the J / ψ Feynman- x region −0.34< x F 1 GeV/ c a significant dependence on the reference frame is found: the polar anisotropy is more pronounced in the Collins-Soper frame and almost vanishes in the helicity frame, where, instead, a significant azimuthal anisotropy arises.
ISSN:	1434-6044 1434-6052
DOI:	10.1140/epjc/s10052-009-0957-7