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Loop-induced photon spectral lines from neutralino annihilation in the NMSSM.

By G. Chalons and A. Semenov


We have computed the loop-induced processes of neutralino annihilation into two photons and, for the first time, into a photon and a Z 0 boson in the framework of the NMSSM. The photons produced from these radiative modes are monochromatic and possess a clear “smoking gun ” experimental signature. This numerical analysis has been done with the help of the SloopS code, initially developed for automatic one-loop calculation in the MSSM. We have computed the rates for different benchmark points coming from SUGRA and GMSB soft SUSY breaking scenarios and compared them with the MSSM. We comment on how this signal can be enhanced, with respect to the MSSM, especially in the low mass region of the neutralino. We also discuss the possibility of this observable to constrain the NMSSM parameter space, taking into account the latest limits from the FERMI collaboration on The existence of cold dark matter (CDM) is supported by many geometrical and dynamical observations coming from cosmology and astrophysics, but its detection needs to be confirmed. Its properties, such as mass, spin, and interactions are still to be determined. A long term experimental effort has been devoted to its detection, from direct methods, where a dark matter particle is expected to impinge on a nucle

Year: 2012
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