Lepton flavor violation and cosmological constraints on R-parity violation

Journal Article · Mon Feb 01 04:00:00 EST 2010 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2010/02/032· OSTI ID:22275443

Endo, Motoi; Hamaguchi, Koichi; Iwamoto, Sho ^[1]

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1. Department of Physics, University of Tokyo, Tokyo 113-0033 (Japan)

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.

• OSTI ID: 22275443
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 02 Vol. 2010; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

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