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arXiv 1706.03432hep-ph
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光束偏振对ILC顶对产生的影响

Beam polarization effects on top-pair production at the ILC

Nhi M. U. Quach, Yoshimasa Kurihara, Khiem H. Phan, Takahiro Ueda

摘要:

讨论了与$t\rightarrow b μν_μ$序列衰变有关的$e^-e^+\rightarrow t \bar{t}$过程的全单圈电弱修正。在单圈水平上,初始电子束和正电子束的自旋极化效应被包含在总截面和微分截面中。采用窄宽度近似处理顶夸克的产生和衰变,同时考虑它们之间的全自旋关联。我们观察到由于弱相互作用引起的辐射修正对总截面和微分截面都有很大的偏振依赖性。因此,依赖于角分布的实验观测值,如顶部产生角的前后不对称性,必须仔细处理,包括辐射校正。我们还观察到底夸克的能量分布主要受辐射修正的影响。

英文摘要:

Full one-loop electroweak-corrections for an $e^-e^+\rightarrow t \bar{t}$ process associated with sequential $t\rightarrow b μν_μ$ decay are discussed. At the one-loop level, the spin-polarization effects of the initial electron and positron beams are included in the total and differential cross sections. A narrow-width approximation is used to treat the top-quark production and decay while including full spin correlations between them. We observed that the radiative corrections due to the weak interaction have a large polarization dependence on both the total and differential cross sections. Therefore, experimental observables that depend on angular distributions such as the forward-backward asymmetry of the top production angle must be treated carefully including radiative corrections. We also observed that the energy distribution of bottom quarks is majorly affected by the radiative corrections.

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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