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arXiv 1809.07993hep-ph
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双夸克偶素过程的NRQCD分解的破坏及其消除

Breakdown of NRQCD Factorization in Processes Involving Two Quarkonia and its Cure

Zhi-Guo He, Bernd A. Kniehl, Xiang-Peng Wang

摘要:

我们研究了非相对论QCD(NRQCD)中包含两个重夸克偶素的包容过程,并证明了在两个P波Fock态的存在下,NRQCD因子分解破裂,留下未取消的红外奇异性.作为现象学上重要的例子,我们考虑通过$b\bar{b}({}^3P_{J_b}^{[8]})\to c\bar{c}({}^3P_J^{[1]})+gg$的衰变$Υ\to χ_{cJ}+X$和通过$e^{+}e^{-}\to c\bar{c}({}^3P_{J_1}^{[8]})+c\bar{c}({}^3P_J^{[1]})+g$的生产过程$e^+e^-\to J/ψ+χ_{cJ}+X$。我们推断,这种奇异性将出现在双夸克偶素强子产生的次主导秩序。为了解决这个问题,我们在NRQCD有效场论中引入了新的算符,它们的量子修正吸收了这些奇异性。

英文摘要:

We study inclusive processes involving two heavy quarkonia in nonrelativisitic QCD (NRQCD) and demonstrate that, in the presence of two P-wave Fock states, NRQCD factorization breaks down, leaving uncanceled infrared singularities. As phenomenologically important examples, we consider the decay $Υ\to χ_{cJ}+X$ via $b\bar{b}({}^3P_{J_b}^{[8]})\to c\bar{c}({}^3P_J^{[1]})+gg$ and the production process $e^+e^-\to J/ψ+χ_{cJ}+X$ via $e^{+}e^{-}\to c\bar{c}({}^3P_{J_1}^{[8]})+c\bar{c}({}^3P_J^{[1]})+g$. We infer that such singularities will appear for double quarkonium hadroproduction at next-to-leading order. As a solution to this problem, we introduce to NRQCD effective field theory new types of operators whose quantum corrections absorb these singularities.

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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