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arXiv 1505.02429hep-phhep-ex
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LHCb上美夸克和魅夸克对产生的不对称性

Beauty-quark and charm-quark pair production asymmetries at LHCb

Rhorry Gauld, Ulrich Haisch, Ben D. Pecjak, Emanuele Re

摘要:

LHCb合作最近在强子对撞机上首次测量了美夸克和反夸克分布的角产生不对称性。我们计算相应的标准模型预测在固定阶微扰理论的不对称性。我们的研究结果显示出良好的协议与数据,这是提供差分为三个箱中的不变质量的$b \bar b$系统。我们还提出了类似的预测内的LHCb接受的碰撞能量为$\sqrt{s} = 13 \, {\rm TeV}$的美夸克和魅夸克的最终状态。我们最后指出,测量的比例的$b \bar b$和$c \bar c$截面可能是有用的实验验证的魅力标记效率。

英文摘要:

The LHCb collaboration has recently performed a first measurement of the angular production asymmetry in the distribution of beauty quarks and anti-quarks at a hadron collider. We calculate the corresponding standard model prediction for this asymmetry at fixed-order in perturbation theory. Our results show good agreement with the data, which is provided differentially for three bins in the invariant mass of the $b \bar b$ system. We also present similar predictions for both beauty-quark and charm-quark final states within the LHCb acceptance for a collision energy of $\sqrt{s} = 13 \, {\rm TeV}$. We finally point out that a measurement of the ratio of the $b \bar b$ and $c \bar c$ cross sections may be useful for experimentally validating charm-tagging efficiencies.

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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