Supersymmetric scenarios with dominant radiative neutralino decay

Journal Article · Sat Feb 01 04:00:00 EST 1997 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.55.1399· OSTI ID:450545

Ambrosanio, S ^[1]; Mele, B ^[2]

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1. Randall Physics Laboratory, University of Michigan, Ann Arbor, Michigan 48109-1120 (United States)
2. INFN, Sezione di Roma 1 and University La Sapienza, Rome (Italy)

The radiative decay of the next-to-lightest neutralino into a lightest neutralino and a photon is analyzed in the minimal supersymmetric standard model. We find that significant regions of the supersymmetric parameter space with large radiative branching ratios (up to about 100{percent}) do exist. The radiative channel turns out to be enhanced when the neutralino tree-level decays are suppressed either {open_quotes}kinematically{close_quotes} or {open_quotes}dynamically.{close_quotes} In general, in the regions allowed by data from CERN LEP and not characterized by asymptotic values of the supersymmetric parameters, the radiative enhancement requires tan{beta}{approx_equal}1 and/or M{sub 1}{approx_equal}M{sub 2}, and negative values of {mu}. We present typical scenarios where these conditions are satisfied, relaxing the usual relation M{sub 1}=(5/3)tan{sup 2}{theta}{sub W}M{sub 2}, i.e., gaugino mass unification at the grand unified theory scale. The influence of varying the top-squark masses and mixing angle when the radiative decay is enhanced is also considered. Some phenomenological consequences of the above picture are discussed. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 450545
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 3 Vol. 55; ISSN 0556-2821; ISSN PRVDAQ
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ELECTROMAGNETIC PARTICLE DECAY
GRAND UNIFIED THEORY
MASS
NEUTRAL PARTICLES
PHOTONS
QUARKS
SCALING LAWS
SPARTICLES
STANDARD MODEL
SUPERSYMMETRY