Testing supersymmetry with lepton flavor violating {tau} and {mu} decays

Journal Article · Wed Mar 01 04:00:00 EST 2006 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.73.055003· OSTI ID:20776890

Arganda, Ernesto; Herrero, Maria J ^[1]

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1. Departamento de Fisica Teorica, UAM/IFT, 28049, Madrid (Spain)

In this work the following lepton flavor violating {tau} and {mu} decays are studied: {tau}{sup -}{yields}{mu}{sup -}{mu}{sup -}{mu}{sup +}, {tau}{sup -}{yields}e{sup -}e{sup -}e{sup +}, {mu}{sup -}{yields}e{sup -}e{sup -}e{sup +}, {tau}{sup -}{yields}{mu}{sup -}{gamma}, {tau}{sup -}{yields}e{sup -}{gamma}, and {mu}{sup -}{yields}e{sup -}{gamma}. We work in a supersymmetric scenario consisting of the minimal supersymmetric standard model particle content, extended by the addition of three heavy right-handed Majorana neutrinos and their supersymmetric partners, and where the generation of neutrino masses is done via the seesaw mechanism. Within this context, a significant lepton flavor mixing is generated in the slepton sector due to the Yukawa neutrino couplings, which is transmitted from the high to the low energies via the renormalization group equations. This slepton mixing then generates via loops of supersymmetric particles significant contributions to the rates of l{sub j}{yields}3l{sub i} and the correlated l{sub j}{yields}l{sub i}{gamma} decays. We analyze here in full detail these rates in terms of the relevant input parameters, which are the usual minimal supergravity parameters and the seesaw parameters. For the l{sub j}{yields}3l{sub i} decays, a full one-loop analytical computation of all the contributing supersymmetric loops is presented. This completes and corrects previous computations in the literature. In the numerical analysis compatibility with the most recent experimental upper bounds on all these {tau} and {mu} decays, with the neutrino data, and with the present lower bounds on the supersymmetric particle masses are required. Two typical scenarios with degenerate and hierarchical heavy neutrinos are considered. We will show here that the minimal supergravity and seesaw parameters do get important restrictions from these {tau} and {mu} decays in the hierarchical neutrino case.

• OSTI ID: 20776890
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 5 Vol. 73; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CONSERVATION LAWS
ELECTRONS
FLAVOR MODEL
MASS RENORMALIZATION
MUONS MINUS
MUONS PLUS
NEUTRINO OSCILLATION
NEUTRINOS
NUMERICAL ANALYSIS
PARTICLE DECAY
PHOTONS
POSITRONS
REST MASS
SPARTICLES
STANDARD MODEL
SUPERGRAVITY
SUPERSYMMETRY
TAU PARTICLES