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Title: New vector-like fermions and flavor physics

Abstract

We study renormalizable extensions of the standard model that contain vector-like 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 $$ {K}^0-{\overline{K}}^0 $$ mixing) are not sensitive to higher scales than other flavor-changing neutral-current processes. We identify order 1/(4πM)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.

Authors:
 [1];  [2];  [3]
  1. Kanazawa University (Japan). Institute for Theoretical Physics
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. California Inst. of Technology (CalTech), Pasadena, CA (United States). Walter Burke Institute for Theoretical Physics
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); California Institute of Technology (CalTech), Pasadena, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1377609
Alternate Identifier(s):
OSTI ID: 1600489
Grant/Contract Number:  
AC02-05CH11231; SC0011632
Resource Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2015; Journal Issue: 10; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Beyond Standard Model; Rare decays; B-Physics; CP violation

Citation Formats

Ishiwata, Koji, Ligeti, Zoltan, and Wise, Mark B. New vector-like fermions and flavor physics. United States: N. p., 2015. Web. doi:10.1007/JHEP10(2015)027.
Ishiwata, Koji, Ligeti, Zoltan, & Wise, Mark B. New vector-like fermions and flavor physics. United States. https://doi.org/10.1007/JHEP10(2015)027
Ishiwata, Koji, Ligeti, Zoltan, and Wise, Mark B. Tue . "New vector-like fermions and flavor physics". United States. https://doi.org/10.1007/JHEP10(2015)027. https://www.osti.gov/servlets/purl/1377609.
@article{osti_1377609,
title = {New vector-like fermions and flavor physics},
author = {Ishiwata, Koji and Ligeti, Zoltan and Wise, Mark B.},
abstractNote = {We study renormalizable extensions of the standard model that contain vector-like 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-{\overline{K}}^0 $ mixing) are not sensitive to higher scales than other flavor-changing neutral-current processes. We identify order 1/(4πM)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.},
doi = {10.1007/JHEP10(2015)027},
journal = {Journal of High Energy Physics (Online)},
number = 10,
volume = 2015,
place = {United States},
year = {Tue Oct 06 00:00:00 EDT 2015},
month = {Tue Oct 06 00:00:00 EDT 2015}
}

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Works referencing / citing this record:

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