Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-08-31
Phys.Rev. D55 (1997) 1399-1417; Erratum-ibid. D56 (1997) 3157-3158
Physics
High Energy Physics
High Energy Physics - Phenomenology
32 pages, LaTeX file + 23 figures embedded with epsf.sty. In this revised version, Eq.(3) plus some related notations and text
Scientific paper
10.1103/PhysRevD.55.1399
The radiative decay of the next-to-lightest neutralino into a lightest neutralino and a photon is analyzed in the MSSM. We find that significant regions of the supersymmetric parameter space with large radiative BR's (up to about 100%) do exist. The radiative channel turns out to be enhanced when the neutralino tree-level decays are suppressed either "kinematically" or "dynamically". In general, in the regions allowed by LEP data and not characterized by asymptotic values of the SuSy parameters, the radiative enhancement requires tan beta ~= 1 and/or M_1 ~= M_2, and negative values of \mu. We present typical specific scenarios where these "necessary" conditions are fulfilled, relaxing the usual relation M_1=(5/3)*tan^2(th_W)*M_2. The influence of varying the stop masses and mixing angle when the radiative decay is enhanced is also considered. Some phenomenological consequences of the above picture are discussed.
Ambrosanio Sandro
Mele Barbara
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