J/psi polarization at hadron colliders in nonrelativistic QCD

2012/01/31 by Kuang-Ta Chao, Yan-Qing Ma, Hua-Sheng Shao +2 · 1 citation
Physics and Astronomy · #hep-ex #hep-ph

paper · pdf · doi:10.1103/physrevlett.108.242004

published as Phys. Rev. Lett. 108, 242004 (2012) · Published version, references updated

arxiv created 2012/06/19 · arxiv updated 2015/06/03

Abstract

With nonrelativistic QCD factorization, we present a full next-to-leading order computation of the polarization observable for J/psi production at hadron colliders including all important Fock states, i.e. ³S₁[1,8], ¹S₀[8], and ³P_J[8]. We find the ³P_J[8] channel contributes a positive longitudinal component and a negative transverse component. So the J/psi polarization puzzle may be understood as the transverse components canceling between ³S₁[8] and ³P_J[8] channels, which results in mainly the unpolarized (even slightly longitudinally polarized) J/psi. This may give a possible solution to the long-standing J/psi polarization puzzle. Predictions for J/psi polarization at the LHC are also presented.

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