Resummed photon spectra for WIMP annihilation
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 nontrivial energy resolution effects. Our framework combines techniques from nonrelativistic EFTs and softcollinear effective theory (SCET), as well as its multiscale extensions that have been recently introduced for studying jet substructure. We find a number of interesting features, including the simultaneous presence of SCET _{I} and SCET _{II} modes, as well as collinearsoft 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 previouslyconsidered 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 gammaray lines from the Galactic Center. Here, we find numerically significant corrections compared to previousmore »
 Authors:

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 Arizona State Univ., Tempe, AZ (United States); Rutgers Univ., Piscataway, NJ (United States). New High Energy Theory Center
 Univ. of Oregon, Eugene, OR (United States)
 Univ. of California, Berkeley, CA (United States). Berkeley Center for Theoretical Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Theoretical Physics Group
 Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Center for Theoretical Physics
 California Inst. of Technology (CalTech), Pasadena, CA (United States). Walter Burke Inst. for Theoretical Physics
 Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
 Publication Date:
 Report Number(s):
 LAUR1731169
Journal ID: ISSN 10298479
 Grant/Contract Number:
 AC5206NA25396; AC0205CH11231
 Type:
 Accepted Manuscript
 Journal Name:
 Journal of High Energy Physics (Online)
 Additional Journal Information:
 Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2018; Journal Issue: 3; Journal ID: ISSN 10298479
 Publisher:
 Springer Berlin
 Research Org:
 Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
 Sponsoring Org:
 USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Nuclear Physics (NP) (SC26)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 79 ASTRONOMY AND ASTROPHYSICS; Astronomy and Astrophysics; Dark Matter Physics
 OSTI Identifier:
 1440487
 Alternate Identifier(s):
 OSTI ID: 1465447
Baumgart, Matthew, Cohen, Timothy, Moult, Ian, Rodd, Nicholas L., Slatyer, Tracy R., Solon, Mikhail P., Stewart, Iain W., and Vaidya, Varun. Resummed photon spectra for WIMP annihilation. United States: N. p.,
Web. doi:10.1007/JHEP03(2018)117.
Baumgart, Matthew, Cohen, Timothy, Moult, Ian, Rodd, Nicholas L., Slatyer, Tracy R., Solon, Mikhail P., Stewart, Iain W., & Vaidya, Varun. Resummed photon spectra for WIMP annihilation. United States. doi:10.1007/JHEP03(2018)117.
Baumgart, Matthew, Cohen, Timothy, Moult, Ian, Rodd, Nicholas L., Slatyer, Tracy R., Solon, Mikhail P., Stewart, Iain W., and Vaidya, Varun. 2018.
"Resummed photon spectra for WIMP annihilation". United States.
doi:10.1007/JHEP03(2018)117. https://www.osti.gov/servlets/purl/1440487.
@article{osti_1440487,
title = {Resummed photon spectra for WIMP annihilation},
author = {Baumgart, Matthew and Cohen, Timothy and Moult, Ian and Rodd, Nicholas L. and Slatyer, Tracy R. and Solon, Mikhail P. and Stewart, Iain W. and Vaidya, Varun},
abstractNote = {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 nontrivial energy resolution effects. Our framework combines techniques from nonrelativistic EFTs and softcollinear effective theory (SCET), as well as its multiscale 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 collinearsoft 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 previouslyconsidered 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 gammaray lines from the Galactic Center. Here, 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.},
doi = {10.1007/JHEP03(2018)117},
journal = {Journal of High Energy Physics (Online)},
number = 3,
volume = 2018,
place = {United States},
year = {2018},
month = {3}
}