Photon spectra from WIMP annihilation

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If the present dark matter in the Universe annihilates into standard model particles, it must contribute to the fluxes of cosmic rays that are detected on the Earth and, in particular, to the observed gamma-ray fluxes. The magnitude of such a contribution depends on the particular dark matter candidate, but certain features of the produced photon spectra may be analyzed in a rather model-independent fashion. In this work we provide the complete photon spectra coming from WIMP annihilation into standard model particle-antiparticle pairs obtained by extensive Monte Carlo simulations. We present results for each individual annihilation channel and provide analytical fitting formulas for the different spectra for a wide range of WIMP masses.
© 2011 American Physical Society. This work has been supported in part by MICINN (Spain) Projects No. FIS 2008-01323 and No. FPA 2008-00592, CAM/UCM 910309, MEC Grant No. BES-2006-12059, DOE Grant No. DE-FG02-94ER40823 and MICINN Consolider-Ingenio MULTIDARK CSD2009-00064. We are particularly grateful to Professor Jonathan Feng for his continuous and encouraging help at UC Irvine during the summer of 2007. We would also like to thank Dr. Mario Bondioli for his preliminary help with simulation software and Dr. Mirco Cannoni, Professor Mario E. Gómez and Professor Mikhail Voloshin for interesting discussions about different aspects of the physical meaning of the spectra behavior. Dr. Abelardo Moralejo drew our attention of some particular aspects of bremsstrahlung. Finally, fruitful discussions were held with Daniel Nieto about detectors' technicalities and improvement of the numerical codes. R. L. acknowledges financial support given by Ministero dell'Istruzione, dell'Universita e della Ricerca (MIUR), by the University of Torino (UniTO), by the Istituto Nazionale di Fisica Nucleare (INFN) within the Astroparticle Physics Project, and by the Italian Space Agency (ASI) under Contract No. I/088/06/0. AdlCD wants to thank David Fernández (UCM) for his technical support with the performed simulations and Dr. Javier Almeida for his help to manage simulation results. Scientific discussions about other available simulation software were held with Beatriz Canadas.
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