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Title: Lepton universality violation with lepton flavor conservation in B-meson decays

Abstract

Anomalies in semileptonic B-meson decays present interesting patterns that might be revealing the shape of the new physics to come. Under the assumption that neutrino and charged lepton mass terms are the only sources of flavor violation and given the hierarchy between the two, we find that charged lepton universality violation without charged lepton flavor violation naturally arises. This can account for a deficit of B+ → K+ μμ over B+ → K+ ee decays with new physics coupled predominantly to muons and a new physics scale of a few TeV. A generic prediction of this scenario is a large enhacement of tauonic B decay rates that, in particular, could accommodate an excess in B → D (*) τ ν. For the most part, the study is carried out in an effective field theory framework with an underlying SU(2)L × U(1) Y symmetry that emphasizes the model-independent correlations between low- and high-energy observables. As an example, a connection between B-decays and top physics is pointed out. To complement the discussion, all possible (spin 0 and 1) leptoquark models are matched to the low-energy field theory so that the effective analysis can be used to survey these candidates for new physics.

Authors:
 [1];  [1];  [2]
  1. University of California, San Diego, La Jolla, CA (United States). Department of Physics
  2. University of California, San Diego, La Jolla, CA (United States). Department of Physics; Johannes Gutenberg-Universität Mainz (Germany). PRISMA Cluster of Excellence Institut für Kernphysik
Publication Date:
Research Org.:
University of California, San Diego, La Jolla, CA (United States). Department of Physics
Sponsoring Org.:
USDOE
OSTI Identifier:
1434590
Grant/Contract Number:  
SC0009919; SC000991
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; Rare Decays; Beyond Standard Model; B-Physics

Citation Formats

Alonso, R., Grinstein, B., and Camalich, J. Martin. Lepton universality violation with lepton flavor conservation in B-meson decays. United States: N. p., 2015. Web. doi:10.1007/JHEP10(2015)184.
Alonso, R., Grinstein, B., & Camalich, J. Martin. Lepton universality violation with lepton flavor conservation in B-meson decays. United States. doi:10.1007/JHEP10(2015)184.
Alonso, R., Grinstein, B., and Camalich, J. Martin. Wed . "Lepton universality violation with lepton flavor conservation in B-meson decays". United States. doi:10.1007/JHEP10(2015)184. https://www.osti.gov/servlets/purl/1434590.
@article{osti_1434590,
title = {Lepton universality violation with lepton flavor conservation in B-meson decays},
author = {Alonso, R. and Grinstein, B. and Camalich, J. Martin},
abstractNote = {Anomalies in semileptonic B-meson decays present interesting patterns that might be revealing the shape of the new physics to come. Under the assumption that neutrino and charged lepton mass terms are the only sources of flavor violation and given the hierarchy between the two, we find that charged lepton universality violation without charged lepton flavor violation naturally arises. This can account for a deficit of B+ → K+ μμ over B+ → K+ ee decays with new physics coupled predominantly to muons and a new physics scale of a few TeV. A generic prediction of this scenario is a large enhacement of tauonic B decay rates that, in particular, could accommodate an excess in B → D (*) τ ν. For the most part, the study is carried out in an effective field theory framework with an underlying SU(2)L × U(1) Y symmetry that emphasizes the model-independent correlations between low- and high-energy observables. As an example, a connection between B-decays and top physics is pointed out. To complement the discussion, all possible (spin 0 and 1) leptoquark models are matched to the low-energy field theory so that the effective analysis can be used to survey these candidates for new physics.},
doi = {10.1007/JHEP10(2015)184},
journal = {Journal of High Energy Physics (Online)},
number = 10,
volume = 2015,
place = {United States},
year = {2015},
month = {10}
}

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