New vector-like fermions and flavor physics

被引：59
作者：
Ishiwata, Koji [1 ]
Ligeti, Zoltan [2 ]
Wise, Mark B. [3 ]
机构：
[1] Kanazawa Univ, Inst Theoret Phys, Kanazawa, Ishikawa 9201192, Japan
[2] Univ Calif Berkeley, Ernest Orlando Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA
[3] CALTECH, Walter Burke Inst Theoret Phys, Pasadena, CA 91125 USA
来源：
JOURNAL OF HIGH ENERGY PHYSICS | 2015年 / 10期
关键词：
Beyond Standard Model; Rare Decays; B-Physics; CP violation; LEPTON-FLAVOR; SEARCH; DECAYS; RARE;
D O I：
10.1007/JHEP10(2015)027
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：
We study renormalizable extensions of the standard model that contain vectorlike fermions in a (single) complex representation of the standard model gauge group. There are 11 models where the vector-like fermions Yukawa couple to the standard model fermions via the Higgs field. These models do not introduce additional fine-tunings. They can lead to, and are constrained by, a number of different flavor-changing processes involving leptons and quarks, as well as direct searches. An interesting feature of the models with strongly interacting vector-like fermions is that constraints from neutral meson mixings (apart from CP violation in K-0 - (K) over bar (0) mixing) are not sensitive to higher scales than other flavor-changing neutral-current processes. We identify order 1/(4 pi M)(2) (where M is the vector-like fermion mass) one-loop contributions to the coefficients of the four-quark operators for meson mixing, that are not suppressed by standard model quark masses and/or mixing angles.
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页数：28
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