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Larget→cZas a sign of vectorlike quarks in light of theWmass
Physical Review D ( IF 4.6 ) Pub Date : 2022-08-17 , DOI: 10.1103/physrevd.106.l031704 Andreas Crivellin , Matthew Kirk , Teppei Kitahara , Federico Mescia
Physical Review D ( IF 4.6 ) Pub Date : 2022-08-17 , DOI: 10.1103/physrevd.106.l031704 Andreas Crivellin , Matthew Kirk , Teppei Kitahara , Federico Mescia
The rare flavor-changing top quark decay is a clear sign of new physics and experimentally very interesting due to the huge number of top quarks produced at the LHC. However, there are few (viable) models which can generate a sizable branching ratio for —in fact vectorlike quarks seem to be the only realistic option. In this paper, we investigate all three representations (under the Standard Model gauge group) of vectorlike quarks (, and ) that can generate a sizable branching ratio for without violating bounds from physics. Importantly, these are exactly the three vectorlike quarks which can lead to a sizable positive shift in the prediction for mass, via the couplings to the top quark also needed for a sizable . Calculating and using the one-loop matching of vectorlike quarks on the Standard Model effective field theory, we find that can be of the order of , and for , and , respectively, and that in all three cases the large mass measurement can be accommodated.
中文翻译:
Larget→cZ 是 Wmass 中类矢量夸克的标志
罕见的改变味道的顶夸克衰变由于大型强子对撞机产生了大量的顶夸克,这是新物理学的明显标志,并且在实验上非常有趣。然而,很少有(可行的)模型可以为——事实上,类矢量夸克似乎是唯一现实的选择。在本文中,我们研究了类矢量夸克的所有三种表示(在标准模型规范组下)(,和) 可以产生相当大的支化率在不违反界限的情况下物理。重要的是,这些正是三个矢量夸克,它们可以导致对质量,通过耦合到顶夸克也需要相当大的. 在标准模型有效场论上计算并使用类矢量夸克的单环匹配,我们发现可以是,和为了,和,并且在所有三种情况下,大可以进行质量测量。
更新日期:2022-08-17
中文翻译:
Larget→cZ 是 Wmass 中类矢量夸克的标志
罕见的改变味道的顶夸克衰变由于大型强子对撞机产生了大量的顶夸克,这是新物理学的明显标志,并且在实验上非常有趣。然而,很少有(可行的)模型可以为——事实上,类矢量夸克似乎是唯一现实的选择。在本文中,我们研究了类矢量夸克的所有三种表示(在标准模型规范组下)(,和) 可以产生相当大的支化率在不违反界限的情况下物理。重要的是,这些正是三个矢量夸克,它们可以导致对质量,通过耦合到顶夸克也需要相当大的. 在标准模型有效场论上计算并使用类矢量夸克的单环匹配,我们发现可以是,和为了,和,并且在所有三种情况下,大可以进行质量测量。