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Resummed photon spectra for WIMP annihilation

  • Matthew Baumgart
  • Timothy Cohen
  • Ian Moult
  • Nicholas L. Rodd
  • Tracy R. Slatyer
  • Mikhail P. Solon
  • Iain W. Stewart
  • Varun Vaidya
Open Access
Regular Article - Theoretical Physics

Abstract

We construct an effective field theory (EFT) description of the hard photon spectrum for heavy WIMP annihilation. This facilitates precision predictions relevant for line searches, and allows the incorporation of non-trivial energy resolution effects. Our framework combines techniques from non-relativistic EFTs and soft-collinear effective theory (SCET), as well as its multi-scale extensions that have been recently introduced for studying jet substructure. We find a number of interesting features, including the simultaneous presence of SCETI and SCETII modes, as well as collinear-soft modes at the electroweak scale. We derive a factorization formula that enables both the resummation of the leading large Sudakov double logarithms that appear in the perturbative spectrum, and the inclusion of Sommerfeld enhancement effects. Consistency of this factorization is demonstrated to leading logarithmic order through explicit calculation. Our final result contains both the exclusive and the inclusive limits, thereby providing a unifying description of these two previously-considered approximations. We estimate the impact on experimental sensitivity, focusing for concreteness on an SU(2)W triplet fermion dark matter — the pure wino — where the strongest constraints are due to a search for gamma-ray lines from the Galactic Center. We find numerically significant corrections compared to previous results, thereby highlighting the importance of accounting for the photon spectrum when interpreting data from current and future indirect detection experiments.

Keywords

Jets Phenomenological Models 

Notes

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) 2018

Authors and Affiliations

  1. 1.Department of PhysicsArizona State UniversityTempeU.S.A.
  2. 2.New High Energy Theory CenterRutgers UniversityPiscatawayU.S.A.
  3. 3.Institute of Theoretical ScienceUniversity of OregonEugeneU.S.A.
  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.Walter Burke Institute for Theoretical PhysicsCalifornia Institute of TechnologyPasadenaU.S.A.
  8. 8.Theoretical DivisionMS B283, Los Alamos National LaboratoryLos AlamosU.S.A.

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