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Title: Lepton flavor violation and cosmological constraints on R-parity violation

Abstract

In supersymmetric standard models R-parity violating couplings are severely constrained, since otherwise they would erase the existing baryon asymmetry before the electroweak transition. It is often claimed that this cosmological constraint can be circumvented if the baryon number and one of the lepton flavor numbers are sufficiently conserved in these R-parity violating couplings, because B/3−L{sub i} for each lepton flavor is separately conserved by the sphaleron process. We discuss the effect of lepton flavor violation on the B−L conservation, and show that even tiny slepton mixing angles θ{sub 12}∼>O(10{sup −4}) and θ{sub 23},θ{sub 13}∼>O(10{sup −5}) will spoil the separate B/3−L{sub i} conservation. In particular, if lepton flavor violations are observed in experiments such as MEG and B-factories, it will imply that all the R-parity violating couplings must be suppressed to avoid the B−L erasure. We also discuss the implication for the decay of the lightest MSSM particle at the LHC.

Authors:
; ;  [1]
  1. Department of Physics, University of Tokyo, Tokyo 113-0033 (Japan)
Publication Date:
OSTI Identifier:
22275443
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2010; Journal Issue: 02; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BARYON NUMBER; BARYONS; COSMOLOGY; FLAVOR MODEL; LEPTONS; LIMITING VALUES; PARITY; PARTICLE DECAY; SPARTICLES; STANDARD MODEL; SUPERSYMMETRY; WEINBERG ANGLE

Citation Formats

Endo, Motoi, Hamaguchi, Koichi, and Iwamoto, Sho. Lepton flavor violation and cosmological constraints on R-parity violation. United States: N. p., 2010. Web. doi:10.1088/1475-7516/2010/02/032.
Endo, Motoi, Hamaguchi, Koichi, & Iwamoto, Sho. Lepton flavor violation and cosmological constraints on R-parity violation. United States. https://doi.org/10.1088/1475-7516/2010/02/032
Endo, Motoi, Hamaguchi, Koichi, and Iwamoto, Sho. Mon . "Lepton flavor violation and cosmological constraints on R-parity violation". United States. https://doi.org/10.1088/1475-7516/2010/02/032.
@article{osti_22275443,
title = {Lepton flavor violation and cosmological constraints on R-parity violation},
author = {Endo, Motoi and Hamaguchi, Koichi and Iwamoto, Sho},
abstractNote = {In supersymmetric standard models R-parity violating couplings are severely constrained, since otherwise they would erase the existing baryon asymmetry before the electroweak transition. It is often claimed that this cosmological constraint can be circumvented if the baryon number and one of the lepton flavor numbers are sufficiently conserved in these R-parity violating couplings, because B/3−L{sub i} for each lepton flavor is separately conserved by the sphaleron process. We discuss the effect of lepton flavor violation on the B−L conservation, and show that even tiny slepton mixing angles θ{sub 12}∼>O(10{sup −4}) and θ{sub 23},θ{sub 13}∼>O(10{sup −5}) will spoil the separate B/3−L{sub i} conservation. In particular, if lepton flavor violations are observed in experiments such as MEG and B-factories, it will imply that all the R-parity violating couplings must be suppressed to avoid the B−L erasure. We also discuss the implication for the decay of the lightest MSSM particle at the LHC.},
doi = {10.1088/1475-7516/2010/02/032},
url = {https://www.osti.gov/biblio/22275443}, journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 02,
volume = 2010,
place = {United States},
year = {2010},
month = {2}
}