Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-08-30
JHEP 0209 (2002) 038
Physics
High Energy Physics
High Energy Physics - Phenomenology
19 page JHEP file with 8 PS figures; previous version contained figure misplacement
Scientific paper
10.1088/1126-6708/2002/09/038
The radiative decay Z2-> Z1 gamma proceeds at the one-loop level in the MSSM. It can be the dominant decay mode for the second lightest neutralino Z2 in certain regions of parameter space of supersymmetric models, where either a dynamical and/or kinematic enhancement of the branching fraction occurs. We perform an updated numerical study of this decay mode in both the minimal supergravity model (mSUGRA) and in the more general MSSM framework. In mSUGRA, the largest rates are found in the ``focus point'' region, where the mu parameter becomes small, and the lightest neutralinos become higgsino-like; in this case, radiative branching fraction can reach the 1% level. Our MSSM analysis includes a scan over independent positive and negative gaugino masses. We show branching fractions can reach the 10-100% level even for large values of the parameter tan(beta). These regions of parameter space are realized in supergravity models with non-universal gaugino masses. Measurement of the radiative neutralino branching fraction may help pin down underlying parameters of the fundamental supersymmetric model.
Baer Howard
Krupovnickas Tadas
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