Precision photon spectra for wino annihilation

  • Matthew Baumgart
  • Timothy Cohen
  • Emmanuel Moulin
  • Ian Moult
  • Lucia Rinchiuso
  • Nicholas L. RoddEmail author
  • Tracy R. Slatyer
  • Iain W. Stewart
  • Varun Vaidya
Open Access
Regular Article - Theoretical Physics


We provide precise predictions for the hard photon spectrum resulting from neutral SU(2)W triplet (wino) dark matter annihilation. Our calculation is performed utilizing an effective field theory expansion around the endpoint region where the photon energy is near the wino mass. This has direct relevance to line searches at indirect detection experiments. We compute the spectrum at next-to-leading logarithmic (NLL) accuracy within the framework established by a factorization formula derived previously by our collaboration. This allows simultaneous resummation of large Sudakov logarithms (arising from a restricted final state) and Sommerfeld effects. Resummation at NLL accuracy shows good convergence of the perturbative series due to the smallness of the electroweak coupling constant — scale variation yields uncertainties on our NLL prediction at the level of 5%. We highlight a number of interesting field theory effects that appear at NLL associated with the presence of electroweak symmetry breaking, which should have more general applicability. We also study the importance of using the full spectrum as compared with a single endpoint bin approximation when computing experimental limits. Our calculation provides a state of the art prediction for the hard photon spectrum that can be easily generalized to other DM candidates, allowing for the robust interpretation of data collected by current and future indirect detection experiments.


Jets Phenomenological Models 


Open Access

This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.


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Copyright information

© The Author(s) 2019

Authors and Affiliations

  1. 1.Department of PhysicsArizona State UniversityTempeU.S.A.
  2. 2.Institute of Theoretical ScienceUniversity of OregonEugeneU.S.A.
  3. 3.IRFU, CEA, Département de Physique des Particules, Université Paris-SaclayGif-sur-YvetteFrance
  4. 4.Berkeley Center for Theoretical PhysicsUniversity of CaliforniaBerkeleyU.S.A.
  5. 5.Theoretical Physics GroupLawrence Berkeley National LaboratoryBerkeleyU.S.A.
  6. 6.Center for Theoretical PhysicsMassachusetts Institute of TechnologyCambridgeU.S.A.
  7. 7.Theoretical Division, MS B283Los Alamos National LaboratoryLos AlamosU.S.A.

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