{ital K}{sub {ital L}}{r_arrow}{pi}{sup 0}{ital e}{sup +}{ital e}{sup {minus}} and {ital B}{r_arrow}{ital X}{sub {ital s}}{ital l}{sup +}{ital l}{sup {minus}} decay in the MSSM

Journal Article · Sun Sep 01 04:00:00 EDT 1996 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.54.3329· OSTI ID:388958

Cho, P ^[1]; Misiak, M; Wyler, D ^[2]

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1. California Institute of Technology, Pasadena, California 91125 (United States)
2. Institut fuer Theoretische Physik der Universitaet Zuerich, Winterthurerstrasse 190, CH-8057 Zuerich (Zwitzerland)

The flavor changing neutral current processes {ital K}{sub {ital L}}{r_arrow}{pi}{sup 0}{ital e}{sup +}{ital e}{sup {minus}}, {ital B}{r_arrow}{ital X}{sub {ital s}}{ital e}{sup +}{ital e}{sup {minus}}, and {ital B}{r_arrow}{ital X}{sub {ital s}}{mu}{sup +}{mu}{sup {minus}} are studied within the minimal supersymmetric extension of the standard model. We first examine the rates for these decay modes in the MSSM with a universal soft supersymmetry breaking sector at a grand unification scale. We later relax the universality condition and investigate the FCNC transitions in a more general class of models with negligible flavor violation in squark mixing matrices. We find that the MSSM prediction for the kaon channel{close_quote}s branching fraction differs from its standard model value by at most 30{percent} over the entire allowed parameter space. On the other hand, supersymmetric contributions could potentially enhance certain {ital B}{r_arrow}{ital X}{sub {ital s}}{ital l}{sup +}{ital l}{sup {minus}} observables by more than 100{percent} relative to standard model expectations. The impact of supersymmetry upon the {ital B} meson modes is strongly correlated with the MSSM value for the Wilson coefficient of the magnetic moment operator that mediates {ital B}{r_arrow}{ital X}{sub {ital s}}{gamma}. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 388958
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 5 Vol. 54; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
B MESONS
BRANCHING RATIO
ELECTRONS
FLAVOR
GRAND UNIFIED THEORY
KAONS NEUTRAL LONG-LIVED
MAGNETIC MOMENTS
NEUTRAL CURRENTS
PIONS NEUTRAL
POSITRONS
SEMILEPTONIC DECAY
SPARTICLES
STANDARD MODEL
SUPERSYMMETRY
SYMMETRY BREAKING