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arXiv 2407.12975hep-phhep-ex
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横向自旋不对称性与FCC-ee上的电子汤川耦合

Transverse spin asymmetries and the electron Yukawa coupling at an FCC-ee

Radja Boughezal, Frank Petriello, Kağan Şimşek

AI总结:

本文提出利用$e^+e^-$对撞机上的单横向自旋不对称性测量,通过量子干涉增强电子汤川耦合灵敏度,可显著提升显著性至三倍以上。

摘要:

我们表明,在$e^+e^-$对撞机上测量单横向自旋不对称性可以增强对电子汤川耦合的灵敏度,可能使得观测到该量的标准模型值成为可能。我们证明,与横向极化电子的包含截面测定相比,在$b\ar{b}$和半轻子$WW$末态中的显著性均可提升至三倍。如果正电子同时被纵向极化,即使极化水平仅为30%,显著性也可提升五倍或更多。该方法利用希格斯信号与连续本底之间的量子干涉,也适用于其他$WW$和$ZZ$末态。

英文摘要:

We show that measurements of single transverse-spin asymmetries at an $e^+e^-$ collider can enhance the sensitivity to the electron Yukawa coupling, possibly enabling observation of the Standard Model value for this quantity. We demonstrate that the significance in both the $b\bar{b}$ and semi-leptonic $WW$ final states can be enhanced by factors of up to three compared to inclusive cross section determinations of this coupling for transversely-polarized electrons. If the positrons can be simultaneously longitudinally polarized, even at the level of 30\%, the significance can be enhanced by a factor of five or more. The method utilizes quantum interference between the Higgs signal and the continuum background and is also applicable in other $WW$ and $ZZ$ final states.

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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