ϒ(nS) and χb(nP) production at hadron colliders in nonrelativistic QCD

Hao Han, Yan-Qing Ma, Ce Meng, Hua-Sheng Shao, Yu-Jie Zhang, and Kuang-Ta Chao
Phys. Rev. D 94, 014028 – Published 21 July 2016

Abstract

ϒ(nS) and χb(nP) (n=1, 2, 3) production at the LHC is studied at next-to-leading order in αs in nonrelativistic QCD. Feeddown contributions from higher χb and ϒ states are all considered for lower ϒ cross sections and polarizations. The long distance matrix elements (LDMEs) are extracted from the yield data, and then used to make predictions for the ϒ(nS) polarizations, which are found to be consistent with the measured polarization data within errors. In particular, the ϒ(3S) polarization puzzle can be understood by a large feeddown contribution from χb(3P) states. Our results may provide a good description for both cross sections and polarizations of prompt ϒ(nS) and χb(nP) production at the LHC.

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  • Received 9 August 2015

DOI:https://doi.org/10.1103/PhysRevD.94.014028

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Particles & Fields

Authors & Affiliations

Hao Han1, Yan-Qing Ma1,2,3, Ce Meng1, Hua-Sheng Shao1, Yu-Jie Zhang4, and Kuang-Ta Chao1,3,5

  • 1School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
  • 2Maryland Center for Fundamental Physics, University of Maryland, College Park, Maryland 20742, USA
  • 3Center for High Energy Physics, Peking University, Beijing 100871, China
  • 4Key Laboratory of Micro-nano Measurement-Manipulation and Physics (Ministry of Education) and School of Physics, Beihang University, Beijing 100191, China
  • 5Collaborative Innovation Center of Quantum Matter, Beijing 100871, China

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Issue

Vol. 94, Iss. 1 — 1 July 2016

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