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The VERITAS array of Cherenkov telescopes has carried out a deepobservational program on the nearby dwarf spheroidal galaxy Segue 1. We reporton the results of nearly 48 hours of good quality selected data, taken betweenJanuary 2010 and May 2011. No significant $\gamma$-ray emission is detected atthe nominal position of Segue 1, and upper limits on the integrated flux arederived. According to recent studies, Segue 1 is the most dark matter-dominateddwarf spheroidal galaxy currently known. We derive stringent bounds on variousannihilating and decaying dark matter particle models. The upper limits on thevelocity-weighted annihilation cross-section are $\mathrm{<\sigma v >^{95% CL}\lesssim 10^{-23} cm^{3} s^{-1}}$, improving our limits from previousobservations of dwarf spheroidal galaxies by at least a factor of two for darkmatter particle masses $\mathrm{m_{\chi}\gtrsim 300 GeV}$. The lower limits onthe decay lifetime are at the level of $\mathrm{\tau^{95% CL} \gtrsim 10^{24}s}$. Finally, we address the interpretation of the cosmic ray lepton anomaliesmeasured by ATIC and PAMELA in terms of dark matter annihilation, and show thatthe VERITAS observations of Segue 1 disfavor such a scenario.

VERITAS Deep Observations of the Dwarf Spheroidal Galaxy Segue 1