The remaining parts for the long-standing J/psi polarization puzzle

Abstract

Based on the non-relativistic quantum chromodynamics factorization formalism, the polarization parameters ${\lambda }_{\theta \varphi }$ and ${\lambda }_{\varphi }$ of $J/\psi$ hadroproduction are analyzed in helicity frame and calculated at QCD next-to-leading order for the first time. For prompt $J/\psi$ production, we take into account the feeddown contributions from ${\chi }_{cJ}$ and $\psi (2S)$ decays. The theoretical predictions for the polarization parameters ${\lambda }_{\theta \varphi }$ and ${\lambda }_{\varphi }$ of $J/\psi$ are presented. With the theoretical results we have done the fit to the experimental measurements on yield and polarization for $J/\psi$ hadroproduction simultaneously, and found that the results are coincide with the experimental measurements at the LHC quite well.

arXiv comment5 pages, 4 figures

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