η_c production at LHC and indications on the understanding of J/ψ production

2014/11/30 by Hao Han, Yan-Qing Ma, Ce Meng +2 · 1 citation
Physics and Astronomy · #hep-ph

paper · pdf · doi:10.1103/physrevlett.114.092005

published as Phys. Rev. Lett. 114, 092005 (2015) · 5 pages, 2 figures, published version in PRL

arxiv created 2015/03/06 · arxiv updated 2015/06/23

Abstract

We present a complete evaluation for the prompt η_c production at the LHC at next-to-leading order in α_s in nonrelativistic QCD. By assuming heavy quark spin symmetry, the recently observed η_c production data by LHCb results in a very strong constraint on the upper bound of the color-octet long distance matrix element 1S0 of J/ψ. We find this upper bound is consistent with our previous study of the J/ψ yield and polarization and can give good descriptions for the measurements, but inconsistent with some other theoretical estimates. This may provide important information for understanding the nonrelativistic QCD factorization formulism.

Cited by

• Probing Heavy-Quark Spin Symmetry in Double J/ψ Hadroproduction

Related

• η_c production at the LHC challenges nonrelativistic-QCD factorization
• Impact of η_c hadroproduction data on charmonium production and polarization within NRQCD framework
• How well does nonrelativistic QCD factorization work at next-to-leading order?
• J/ψ(ψ′)Production at the Tevatron and LHC atO(αs4v4)in Nonrelativistic QCD
• J/psi production and polarization