Collider phenomenology of a unified leptoquark model
Collider phenomenology of a unified leptoquark model
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DOI：
10.1103/physrevd.101.095024
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发表时间：
2018-12
影响因子：
5
通讯作者：
T. Faber;M. Hudec;Helena Kolevsov'a;Yang Liu;Michal Malinsk'y;W. Porod;F. Staub
中科院分区：
文献类型：
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作者：
T. Faber;M. Hudec;Helena Kolevsov'a;Yang Liu;Michal Malinsk'y;W. Porod;F. Staub
我们证明了在最近提出的基于规范群SU（4）C × SU（2）L × U（1）R的统一细夸克模型中，RK和RK ε可以在不需要额外重费米子的情况下与标准模型值发生显著的偏差.低能数据，特别是轻子味破坏μ衰变和KL → e μ，严重限制了可用的参数空间。我们表明，在参数空间的允许部分（i）一些轻子味违反τ衰变分支比预测接近其目前的实验极限。(ii)在大型强子对撞机上，标量轻夸克可以通过它们的主要衰变模式探测到τ轻子、电子和第三代夸克。(iii)介子振荡的限制意味着标量胶子的质量，另一对有色多重态，必须大于15 TeV左右，因此，它们只能在未来的100 TeV对撞机上探测。在中性和带电的变体中，这些标量主要衰变为第三代夸克，分支比高达O（10%）进入家族混合的终态。此外，在B衰变反常最终消失的情况下，我们对当前方案中标量胶子的唯象进行了评述。
We demonstrate that in a recently proposed unified leptoquark model based on the gauge group SU(4)C×SU(2)L×U(1)R significant deviations from the Standard Model values of RK and RK∗ can be accommodated without any need of extra heavy fermions. Low energy data, in particular lepton-flavor-violating μ decays and KL→eμ, severely constrain the available parameter space. We show that in the allowed part of the parameter space (i) some of the lepton-flavor-violating tau decay branching ratios are predicted to be close to their current experimental limits. (ii) The underlying scalar leptoquarks can be probed at the LHC via their dominant decay modes into tau leptons and electrons and the third generation quarks. (iii) The constraints from meson oscillations imply that the masses of scalar gluons, another pair of colored multiplets around, have to be bigger than around 15 TeV, and thus, they can be probed only at a future 100 TeV collider. In both neutral and charged variants, these scalars decay predominantly into third generation quarks, with up to O(10%) branching ratios into family-mixed final states. Besides that, we comment on the phenomenology of the scalar gluons in the current scenarios in the case that the B-decay anomalies eventually disappear.