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We present the results of stereoscopic observations of the satellite galaxySegue 1 with the MAGIC Telescopes, carried out between 2011 and 2013. Withalmost 160 hours of good-quality data, this is the deepest observationalcampaign on any dwarf galaxy performed so far in the very high energy range ofthe electromagnetic spectrum. We search this large data sample for signals ofdark matter particles in the mass range between 100 GeV and 20 TeV. For this weuse the full likelihood analysis method, which provides optimal sensitivity tocharacteristic gamma-ray spectral features, like those expected from darkmatter annihilation or decay. In particular, we focus our search on gamma-raysproduced from different final state Standard Model particles, annihilation withinternal bremsstrahlung, monochromatic lines and box-shaped signals. Ourresults represent the most stringent constraints to the annihilationcross-section or decay lifetime obtained from observations of satellitegalaxies, for masses above few hundred GeV. In particular, our strongest limit(95% confidence level) corresponds to a ~500 GeV dark matter particleannihilating into tau+tau-, and is of order <sigma v> ~ 1.2x10^{-24} cm^3s^{-1} - a factor ~40 above the <sigma v> thermal value.

Optimized dark matter searches in deep observations of Segue 1 with MAGIC