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arXiv 2602.05615hep-ph
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重费米子分裂到P波夸克onium态的-order-v²相对论修正

Order-$v^2$ relativistic corrections to heavy-quark fragmentation into $P$-wave quarkonium states

School of Physics, Liaoning University(辽宁大学物理学院);School of Physics and Electronic Technology, Liaoning Normal University(辽宁师范大学物理与电子技术学院)

Sai Cui, Sheng-Juan Jiang, Guang-Zhi Xu, Kui-Yong Liu

AI总结:

本文在非相对论QCD框架内,系统计算了重费米子分裂到P波夸克onium态的分裂函数,并到order-v²的相对论修正,结果在高能区域与完整固定阶结果一致。

摘要:

在非相对论量子色动力学(NRQCD)因子化框架内,并基于Collins-Soper算符定义的分裂函数,我们系统地计算了重费米子分裂到色单态P波夸克onium态的分裂函数。在复现并确认已知的最高阶结果后,我们进一步计算了到order-v²的相对论修正。我们的分析既适用于由相同味重费米子组成的夸克onium系统,也适用于由不同味重费米子组成的B_c型介子。数值结果表明,对于所有色单态P波通道,在动量分数z区域的大部分区域,order-v²的相对论修正给出显著的负贡献。我们进一步通过单光子过程计算了P波夸克onium加charm有核粒子在e+e-湮灭中的包络截面,直到order-v²,应用我们获得的分裂函数,所得预测在高能区域与完整固定阶结果一致。

英文摘要:

Within the framework of nonrelativistic QCD (NRQCD) factorization,and based on the Collins--Soper operator definition of fragmentation functions, we present a systematic calculation of the fragmentation functions for a heavy quark fragmenting into color-singlet $P$-wave quarkonium states. After reproducing and confirming the known leading-order results, we further compute the relativistic corrections up to order $\mathcal{O}(v^{2})$. Our analysis applies both to quarkonium systems composed of heavy quarks with the same flavor and to $B_c$-type mesons formed by heavy quarks of different flavors. Numerical results show that, for all color-singlet $P$-wave channels, the $\mathcal{O}(v^{2})$ relativistic corrections give sizable negative contributions over most of the momentum-fraction $z$ region. We further compute inclusive cross sections for $P$-wave quarkonium plus charmed hadrons in $e^+e^-$ annihilation via the single photon process up to $\mathcal{O}(v^{2})$ by applying our obtained fragmentation functions, and the resulting predictions are consistent with the full fixed-order results in the high-energy region.

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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