Exploring top quark FCNC within 2HDM type III in association with flavor physics

被引：37

作者：

Kim, C. S. ^{[1
]}

Yoon, Yeo Woong ^{[2
,3
]}

Yuan, Xing-Bo ^{[1
]}

机构：

[1] Yonsei Univ, Dept Phys, Seoul 120749, South Korea

[2] KonKuk Univ, Sch Phys, Seoul 143701, South Korea

[3] Korea Inst Adv Study, Sch Phys, Seoul 130722, South Korea

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2015年 / 12期

关键词：

Higgs Physics; Beyond Standard Model; B-Physics; Rare Decays; CHANGING NEUTRAL CURRENTS; LEADING QCD CORRECTIONS; HIGGS DOUBLET MODELS; ANOMALOUS DIMENSIONS; MATRIX ELEMENT; CKM-MATRIX; SEARCH; DECAYS; OPERATORS; COUPLINGS;

D O I：

10.1007/JHEP12(2015)038

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

The top quark flavor changing neutral current (FCNC) process is an excellent probe to search for new physics in top sector since the Standard Model expectation is extremely suppressed. We explore Higgs-mediated top quark FCNC, focusing on H-t-c Yukawa coupling lambda(ct) within the general two Higgs doublet model. After electroweak symmetry breaking the top quark FCNC couplings are included in the charged Higgs Yukawa sector so that they contribute to various processes in flavor physics. To probe lambda(ct), we study anomalous single top production and the same sign top pair production at the LHC in association with flavor physics from the tree-level processes B -> D(*) tau nu, B -> tau nu as well as from the loop-level processes B-d -> X-s gamma, B-d,B- s - (B) over bar (d,s) mixing. We perform combined analysis of all the constraints regarding the fine-tuning argument to fit the data and discuss future prospect. The recently updated measurements on B -> D(*) tau nu still prefer large lambda(ct), but we show that the current bound on the same sign top pair production at the LHC gives the most significant upper bound on lambda(ct) to be less than 10 similar to 30 depending on neutral heavy Higgs masses. We also find that for the given upper bound on lambda(ct), B -> D(*) tau nu put significant lower bound on H-tau-tau Yukawa coupling, and the bound is proportional to the charged Higgs mass.

引用

页码：1 / 30

页数：30

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