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arXiv 2003.05571hep-ph
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夸克味变化的希格斯粒子从一个普遍的额外维度衰变

Quark-flavor-changing Higgs decays from a universal extra dimension

Carlos M. Farrera, Alejandro Granados-González, Héctor Novales-Sánchez, J. Jesús Toscano

摘要:

卡鲁扎-克莱因场从四维的观点描述了紧致普适额外维的存在,它会通过由某种紧致化尺度$R^{-1}$决定的效应改变低能的可观测量,因为它是单圈水平的,因此与标准模型在树水平禁止的物理现象特别相关。本文探讨,对于一个普遍的额外维度的情况下,这种新的物理贡献希格斯衰变$h^{(0)}\to q^{(0)}_αq^{(0)}_β$,到夸克对不同的口味,一种衰变过程,在标准模型,严格发生在圈的水平。计算了解耦为$R^{-1}\to \infty$的有限结果。近似短的表达式,有效的大紧化尺度,提供。我们估计,卡鲁扎-克莱因的贡献低于标准模型的预测,在$1.4\,{\rm TeV}<R^{-1}<10\,{\rm TeV}$内的紧化尺度小2到3个数量级。

英文摘要:

Kaluza-Klein fields characterizing, from a four-dimensional viewpoint, the presence of compact universal extra dimensions would alter low-energy observables through effects determined by some compactification scale, $R^{-1}$, since the one-loop level, thus being particularly relevant for physical phenomena forbidden at tree level by the Standard Model. The present paper explores, for the case of one universal extra dimension, such new-physics contributions to Higgs decays $h^{(0)}\to q^{(0)}_αq^{(0)}_β$, into pairs of quarks with different flavors, a sort of decay process which, in the Standard Model, strictly occurs at the loop level. Finite results, decoupling as $R^{-1}\to \infty$, are calculated. Approximate short expressions, valid for large compactification scales, are provided. We estimate that Kaluza-Klein contributions lie below predictions from the Standard Model, being about 2 to 3 orders of magnitude smaller for compactification scales within $1.4\,{\rm TeV}<R^{-1}<10\,{\rm TeV}$.

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