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arXiv 0903.2250hep-ph
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强子对撞机上重夸克偶素与$B_c(^*)$介子的配对产生

Pair Production of Heavy Quarkonium and $B_c(^*)$ Mesons at Hadron Colliders

Rong Li, Yu-Jie Zhang, Kuang-Ta Chao

摘要:

我们在色单重态机制(CSM)下研究了LHC上S波重夸克偶素的对产生,并估计了胶子碎裂过程在色八重态机制(COM)下的贡献。用前面在首阶计算中提取的矩阵元,数值计算结果表明,在LHC中的对产生过程的产生率是相当大的。当$p_t$小于约8GeV时,CSM中$p_t$双产生的$p_t$分布优于COM中的分布。对于双$Υ$的产生,COM的贡献总是大于CSM。CSM和COM对大$p_t$区域中的$p_t$分布的理论预测之间的巨大差异有助于澄清COM对夸克偶素产生的影响。我们还研究了S波$B_c$和$B_c^*$介子的对产生,这些过程的测量对于验证CSM和提取$B_c$和$B_c^*$介子的LDME是有用的.

英文摘要:

We investigate the pair production of S-wave heavy quarkonium at the LHC in the color-singlet mechanism (CSM) and estimate the contribution from the gluon fragmentation process in the color-octet mechanism (COM) for comparison. With the matrix elements extracted previously in the leading order calculations, the numerical results show that the production rates are quite large for the pair production processes at the LHC. The $p_t$ distribution of double $J/ψ$ production in the CSM is dominant over that in the COM when $p_t$ is smaller than about 8GeV. For the production of double $Υ$, the contribution of the COM is always larger than that in the CSM. The large differences in the theoretical predictions between the CSM and COM for the $p_t$ distributions in the large $p_t$ region are useful in clarifying the effects of COM on the quarkonium production. We also investigate the pair production of S-wave $B_c$ and $B_c^*$ mesons, and the measurement of these processes is useful to test the CSM and extract the LDMEs for the $B_c$ and $B_c^*$ mesons.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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