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arXiv 1406.2295hep-phhep-ex
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用喷注子结构探讨夸克偶素产生机制

Probing Quarkonium Production Mechanisms with Jet Substructure

Matthew Baumgart, Adam K. Leibovich, Thomas Mehen, Ira Z. Rothstein

摘要:

我们在夸克偶素的背景下使用碎裂喷流函数(FJF)来研究NRQCD(3S_1^(1),3S_1^(8),1S_0^(8),3P_J^(8))预言的产生通道。我们选择一组FJF,给出在具有固定圆锥尺寸和能量的圆锥算法喷流内找到具有给定动量分数的夸克偶素的概率。这个观察给出了几个杠杆臂,允许人们区分不同的生产渠道。特别是,我们表明,在固定的动量分数的个人生产机制有不同的行为作为射流能量的函数。由于这一事实,我们得到了一个强有力的预言:如果去极化1S_0^(8)矩阵元占主导地位,那么胶子FJF将随着能量的增加而减小,动量分数z是固定的,且z > 0.5。

英文摘要:

We use fragmenting jet functions (FJFs) in the context of quarkonia to study the production channels predicted by NRQCD (3S_1^(1), 3S_1^(8), 1S_0^(8), 3P_J^(8)). We choose a set of FJFs that give the probability to find a quarkonium with a given momentum fraction inside a cone-algorithm jet with fixed cone size and energy. This observable gives several lever arms that allow one to distinguish different production channels. In particular, we show that at fixed momentum fraction the individual production mechanisms have distinct behaviors as a function of the the jet energy. As a consequence of this fact, we arrive at the robust prediction that if the depolarizing 1S_0^(8) matrix element dominates, then the gluon FJF will diminish with increasing energy for fixed momentum fraction, z, and z > 0.5.

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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