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arXiv 1702.06996hep-phhep-ex
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用$b$喷注的电荷识别探测顶夸克宽度

Probing the top-quark width using the charge identification of $b$ jets

Pier Paolo Giardino, Cen Zhang

摘要:

提出了一种基于LHC产生$pp\to Wbj$过程中$b$ -电荷不对称性的开/离壳比测量顶夸克宽度的新方法。电荷不对称性消除了几乎所有的背景和相关的不确定性,而剩余的系统和理论的不确定性可以通过截面的比率来控制。仅限于统计误差,在一个乐观的情况下,我们发现,我们的方法导致良好的精度在高积分亮度,在几百兆电子伏假设300-3000 fb $^{-1}$在大型强子对撞机。该方法直接探测总宽度,以这样的方式,模型依赖性可以最小化。它是现有的横截面测量的补充,总率和分支比之间总是留下一个简并,并提供有关顶夸克的属性有价值的信息。该建议开辟了新的机会,精密顶部测量使用$b$ -电荷识别算法。

英文摘要:

We propose a new method for measuring the top-quark width based on the on-/off-shell ratio of $b$-charge asymmetry in $pp\to Wbj$ production at the LHC. The charge asymmetry removes virtually all backgrounds and related uncertainties, while remaining systematic and theoretical uncertainties can be taken under control by the ratio of cross sections. Limited only by statistical error, in an optimistic scenario, we find that our approach leads to good precision at high integrated luminosity, at a few hundred MeV assuming 300-3000 fb$^{-1}$ at the LHC. The approach directly probes the total width, in such a way that model-dependence can be minimized. It is complementary to existing cross section measurements which always leave a degeneracy between the total rate and the branching ratio, and provides valuable information about the properties of the top quark. The proposal opens up new opportunities for precision top measurements using a $b$-charge identification algorithm.

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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