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New vector-like fermions and flavor physics

  • Regular Article - Theoretical Physics
  • Open Access
  • Published: 06 October 2015
  • volume 2015, Article number: 27 (2015)
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New vector-like fermions and flavor physics
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  • Koji Ishiwata1,
  • Zoltan Ligeti2 &
  • Mark B. Wise3 

  • 472 Accesses

  • 48 Citations

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  • Cite this article

A preprint version of the article is available at arXiv.

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.

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This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.

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Authors and Affiliations

  1. Institute for Theoretical Physics, Kanazawa University, Kanazawa, 920-1192, Japan

    Koji Ishiwata

  2. Ernest Orlando Lawrence Berkeley National Laboratory, University of California, Berkeley, CA, 94720, U.S.A.

    Zoltan Ligeti

  3. Walter Burke Institute for Theoretical Physics, California Institute of Technology, Pasadena, CA, 91125, U.S.A.

    Mark B. Wise

Authors
  1. Koji Ishiwata
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  2. Zoltan Ligeti
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  3. Mark B. Wise
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Correspondence to Koji Ishiwata.

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ArXiv ePrint: 1506.03484

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Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0), which permits use, duplication, adaptation, distribution, and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Cite this article

Ishiwata, K., Ligeti, Z. & Wise, M.B. New vector-like fermions and flavor physics. J. High Energ. Phys. 2015, 27 (2015). https://doi.org/10.1007/JHEP10(2015)027

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  • Received: 25 June 2015

  • Revised: 31 August 2015

  • Accepted: 13 September 2015

  • Published: 06 October 2015

  • DOI: https://doi.org/10.1007/JHEP10(2015)027

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Keywords

  • Beyond Standard Model
  • Rare Decays
  • B-Physics
  • CP violation

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