The KARMEN anomaly, light neutralinos and type II supernovae

Details The KARMEN anomaly, light neutralinos and type II supernovae The KARMEN anomaly, light neutralinos and type II supernovae

2000-01-17

arxiv.org/abs/hep-ph/0001160v2

JHEP 0002 (2000) 010

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages latex, 1 eps figure. Slightly revised (cf. title), matches published version

Scientific paper

10.1088/1126-6708/2000/02/010

The KARMEN experiment observes a time anomaly in events induced by pion decay at rest. This anomaly can be ascribed to the production of a new weakly interacting particle X with mass m_X\sim 34 MeV. We show that a recently proposed identification of the X particle with the lightest neutralino \chi in the frame work of the MSSM with broken R parity is in contradiction to optical observations of type II supernovae.

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