Constraints on lepton flavor violation in the minimal supersymmetric standard model from the muon anomalous magnetic moment measurement

Journal Article · Mon Oct 01 04:00:00 EDT 2001 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.64.075015· OSTI ID:40277413

Chacko, Z; Kribs, Graham D

We establish a correspondence between those Feynman diagrams in the minimal supersymmetric standard model (MSSM) that give supersymmetric contributions to the muon anomalous magnetic moment and those that contribute to the flavor violating processes {mu}{yields}e{gamma} and {tau}{yields}{mu}{gamma}. Using current experimental limits on the branching ratios of these decay modes, combined with the assumption of a supersymmetric contribution to the muon anomalous magnetic moment, we establish bounds on the size of the lepton flavor violating soft masses in the MSSM largely independent of assumptions about other supersymmetric parameters. If the deviation measured at Brookhaven National Laboratory is from supersymmetry, we find the bounds m{sup 2} {sub e{mu}}/{bar m}{sup 2}{approx}<2 x 10{sup -4} and m{sup 2} {sub {tau}{mu}}/{bar m}{sup 2}{approx}<1 x 10{sup -1}, where {bar m}{sup 2} is the mass of the heaviest particle in any loop that contributes at this level to the anomalous magnetic moment of the muon. This provides a significant constraint on the non-flavor-blind mediation of supersymmetry breaking that often occurs at a suppressed level in many models, including gaugino mediation.

• Sponsoring Organization: (US)
• DOE Contract Number: FG02-95ER40896; FG03-96ER40956
• OSTI ID: 40277413
• Journal Information: Physical Review D, Journal Name: Physical Review D Journal Issue: 7 Vol. 64; ISSN 0556-2821
• Publisher: The American Physical Society
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BNL
BRANCHING RATIO
DECAY
FEYNMAN DIAGRAM
LEPTONS
MAGNETIC MOMENTS
MUONS
STANDARD MODEL
SUPERSYMMETRY