Electroweak fragmentation functions  for dark matter annihilation

Cavasonza, Leila Ali; Krämer, Michael; Pellen, Mathieu

Contribution to a conference proceedings/Contribution to a book

PUBDB-2016-05905

Electroweak fragmentation functions for dark matter annihilation

Cavasonza, L. A. ; Krämer, M. ; Pellen, M.

2014
Verlag Deutsches Elektronen-Synchrotron Hamburg
ISBN: 978-3-935702-59-1

Cavasonza, Leila Ali "Electroweak fragmentation functions for dark matter annihilation" in Proceedings, 10th Patras Workshop on Axions, WIMPs and WISPs (AXION-WIMP 2014) / Tsesmelis, Emmanuel, Maroudas, Marios (eds.), Verlag Deutsches Elektronen-Synchrotron : 2014 ; AXION-WIMP 2014 : 10th Patras Workshop on Axions, WIMPs and WISPs, 2014-06-29 - 2014-07-04, Geneva
10th Patras Workshop on Axions, WIMPs and WISPs, AXION-WIMP 2014, Geneva, Switzerland, 29 Jun 2014 - 4 Jul 2014 Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-PROC 33-36 (2014) [10.3204/DESY-PROC-2014-03/kraemer_michael]

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Please use a persistent id in citations: doi:10.3204/DESY-PROC-2014-03/kraemer_michael

Abstract: Electroweak corrections are relevant for dark matter indirect detection predictions. The quality of the fragmentation function approximation to describe electroweak gauge boson radiation is examined in two concrete models. For models with Majorana fermion dark matter annihilation into light fermions, the fragmentation function approximation does not work, due to the helicity suppression of the lowest-order cross section. For other models, like those with vector dark matter, fragmentation functions provide very reliable results for dark matter with masses $M_{\rm DM} \gtrsim 500$\,GeV.

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