Journal
PHYSICS LETTERS B
Volume 646, Issue 1, Pages 34-38Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2007.01.012
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Funding
- STFC [ST/H000992/1, ST/K001604/1] Funding Source: UKRI
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We point out that thermal relic abundance of the dark matter is strongly altered by a non-perturbative effect called the Sommerfeld enhancement, when constituent particles of the dark matter are non-singlet under the SU(2)(L) gauge interaction and much heavier than the weak gauge bosons. Typical candidates for such dark matter particles are the heavy wino- and higgsino-like neutralinos. We investigate the non-perturbative effect on the relic abundance of dark matter for the wino-like neutralino as an example. We show that its thermal abundance is reduced by 50% compared to the perturbative result. The wino-like neutralino mass consistent with the observed dark matter abundance turns out to be 2.7 TeV <= m <= 3.0 TeV. (c) 2007 Elsevier B.V. All rights reserved.
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