The ALICE Collaboration has studied J/psi production in pp collisions at root 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 < y < 4, 2 < p(t) < 8 GeV/c, in the helicity and Collins-Soper reference frames. In both frames, the polarization parameters are compatible with zero, within uncertainties.

J/psi Polarization in pp Collisions at root s=7 TeV / B., A., A. A., Q., D., A., A. M., A., M. M., A., G. A., R., A. G., A., A., A., S. A., S., Z., A., N., A., A. A., M., S. U., A., A., A., D., A., B., A., R., A., A., A., A., A., E. A., A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 108:(2012), p. 082001. [10.1103/physrevlett.108.082001]

J/psi Polarization in pp Collisions at root s=7 TeV

L. Cunqueiro;MEDDI, Franco;
2012

Abstract

The ALICE Collaboration has studied J/psi production in pp collisions at root 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 < y < 4, 2 < p(t) < 8 GeV/c, in the helicity and Collins-Soper reference frames. In both frames, the polarization parameters are compatible with zero, within uncertainties.
2012
p(p)over-bar collisions; heavy quarkonium; qcd corrections; s=1.8 tev; prompt
01 Pubblicazione su rivista::01a Articolo in rivista
J/psi Polarization in pp Collisions at root s=7 TeV / B., A., A. A., Q., D., A., A. M., A., M. M., A., G. A., R., A. G., A., A., A., S. A., S., Z., A., N., A., A. A., M., S. U., A., A., A., D., A., B., A., R., A., A., A., A., A., E. A., A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 108:(2012), p. 082001. [10.1103/physrevlett.108.082001]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/499493
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