J/psi polarization in pp collisions at sqrt(s)=7 TeV

• Published in: Physical review letters 2012, Vol.108
• Main Authors: Abelev, B., Arbor, N., Conesa Balbastre, G., Faivre, J., Furget, C., Guernane, R., Kox, S., Mao, Y., Real, J.S., Vernet, R., Aphecetche, Laurent, Batigne, Guillaume, Bregant, M., Delagrange, H., Driga, O., Estienne, Magali, Germain, Marie, Lardeux, A., Lefèvre, F., Lenhardt, M., Luquin, L., Martinez Garcia, Gines, Mas, A., Matyja, A., Pillot, Philippe, Schutz, Y., Stocco, Diego, Belikov, I., Coffin, J.P., Conesa del Valle, Z., Hippolyte, B., Jangal, S., Kuhn, C., Maire, A., Michalon, A., Roy, C., Senyukov, S., Wan, R., Cheynis, B., Ducroux, L., Grossiord, J.-Y., Guilbaud, Maxime, Massacrier, L., Tieulent, R., Uras, A., Zoccarato, Y., Ahn, Sang Un, Baek, Y.W., Baldit, A., Barret, V., Bastid, N., Crochet, P., Dupieux, P., Ichou, R., Lopez, X., Manso, F., Marchisone, M., Porteboeuf-Houssais, S., Rosnet, P., Vulpescu, B., Zhang, X., Le Bornec, Y., Tapia Takaki, J.D., Valencia Palomo, L., Espagnon, B., Suire, C., Baldisseri, A., Borel, H., Castillo Castellanos, J., Charvet, J. -L., Geuna, C., Pal, S., Rakotozafindrabe, A.
• Format: Article
• Language: English
• Subjects: High Energy Physics - Experiment; Physics
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PhysRevLett.108.082001

The ALICE Collaboration has studied J/psi production in pp collisions at sqrt(s)=7 TeV at the LHC through its muon pair decay. The polar and azimuthal angle distributions of the decay muons were measured, and results on the J/psi polarization parameters lambda_theta and lambda_phi were obtained. The study was performed in the kinematic region 2.5