4.7 Article

χcJ production associated with a c(c)over-bar pair at hadron colliders

期刊

PHYSICAL REVIEW D
卷 83, 期 11, 页码 -

出版社

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.83.114037

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资金

  1. National Natural Science Foundation of China [11021092, 11075002]
  2. Ministry of Science and Technology of China [2009CB825200]

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chi(cJ) (J = 0, 1, 2) production associated with a charm quark pair in hadron collisions is calculated in the framework of nonrelativistic QCD at the Tevatron and LHC. It is found that the color-singlet contribution is small and the color-octet contribution may be dominant in the large p(T) region. The differential cross section of p (p) over bar -> chi(c) + c (c) over bar is at least 1 order of magnitude smaller than the next-to-leading order result of chi(cJ) inclusive production p (p) over bar -> chi(c) + X; therefore chi(cJ) production in p (p) over bar -> chi(c) + c (c) over bar may have negligible influence on the ratio R-chi c = sigma chi c2/sigma chi c1 measured by CDF Collaboration at the Tevatron. The feed-down contribution from chi(cJ) + c + (c) over bar is found to be large compared with J/psi direct production and may have important influence on the measurement of J/psi + c + (c) over bar. The validity of fragmentation approximation for the process is also discussed.

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