Polarization for Prompt J/psi, psi(2s) production at the Tevatron and LHC

2012/05/31 by Bin Gong, Lu-Ping Wan, Jian-Xiong Wang +1 · 1 citation
Physics and Astronomy · #hep-ph

paper · pdf · doi:10.1103/physrevlett.110.042002

published as Phys. Rev. Lett 110, 042002 (2013) · 4 pages, 4 figures, published at PRL

arxiv created 2013/01/28 · arxiv updated 2013/02/25

Abstract

Based on nonrelativistic QCD, we present the first complete next-to-leading order study on the polarization of prompt J/psi hadroproduction by including feeddown from chi_c(³P_J¹,³S₁⁸) and psi(2s) which turn out to be a very important part. By using the color-octet long-distance matrix elements obtained from a combined fit of the differential cross section measurements at the Tevatron and LHC for J/psi, psi(2s) and chi_c with p_t>7GeV, the prompt J/psi polarization predictions are presented, and the results are in agree with the CDF Run-I data (except two points), but in conflict with the CDF Run-II data, while are close to the ALICE data (inclusive J/psi) at LHC. The experimental measurements at the LHC are strongly expected to clarify the situation.

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