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arXiv 2409.12643hep-phhep-ex
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ep对撞机上单顶夸克产生过程中反常$tbW$耦合的T奇可观测量

T-odd observables from anomalous $tbW$ couplings in single-top production at an $ep$ collider

Saurabh D. Rindani

AI总结:

本文提出在ep对撞机的单顶夸克产生中利用反顶夸克横向极化和动量T奇关联测量虚反常$tbW$耦合,并估计两种电子能量下的1-σ灵敏度。

摘要:

我们研究了在过程$e^-p \to ν_e \overline t X$中借助T奇可观测量测量虚的反常$tbW$耦合的可能性。这里考虑的一种此类可观测量是反顶夸克相对于产生平面的横向极化。另一种是在顶夸克发生轻子衰变时由可观测动量构造的T奇关联。结果表明,这两种T奇可观测量都仅正比于$tbW$反常耦合之一的虚部,而其他耦合给出的贡献要么为零,要么可忽略。该虚部可能预示CP奇耦合,或有效耦合中的吸收部分,或两者兼有。对于质子能量为7 TeV、电子能量为60 GeV的对撞机,以及电子能量更高、为150 GeV的情形,我们估计了在每种可观测量情况下可能得到的1-σ限制。

英文摘要:

We investigate the possibility that an imaginary anomalous $tbW$ coupling can be measured in the process $e^-p \to ν_e \overline t X$ by means of T-odd observables. One such observable considered here is the polarization of the top antiquark transverse to the production plane. The other is a T-odd correlation constructed out of observable momenta when the top quark decays leptonically. Both these T-odd observables are shown to be proportional to the imaginary part of only one of the $tbW$ anomalous couplings, the other couplings giving either vanishing or negligible contribution. This imaginary part could signal either a CP-odd coupling, or an absorptive part in the effective coupling, or both. We estimate the 1-$σ$ limits that might be derived in the case of each of these observables for a collider with a proton energy of 7 TeV and an electron energy of 60 GeV and also in the case of a higher electron energy of 150 GeV.

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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