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Upper Bound on the Dark Matter Total Annihilation Cross Section

Beacom, John F. and Bell, Nicole F. and Mack, Gregory D. (2007) Upper Bound on the Dark Matter Total Annihilation Cross Section. Physical Review Letters, 99 (23). Art. No. 231301. ISSN 0031-9007.

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We consider dark matter annihilation into standard model particles and show that the least detectable final states, namely, neutrinos, define an upper bound on the total cross section. Calculating the cosmic diffuse neutrino signal, and comparing it to the measured terrestrial atmospheric neutrino background, we derive a strong and general bound. This can be evaded if the annihilation products are dominantly new and truly invisible particles. Our bound is much stronger than the unitarity bound at the most interesting masses, shows that dark matter halos cannot be significantly modified by annihilations, and can be improved by a factor of 10–100 with existing neutrino experiments.

Item Type:Article
Additional Information:©2007 The American Physical Society. (Received 4 August 2006; revised 17 September 2007; published 5 December 2007) We are grateful to G. Bertone for very helpful discussions and collaboration on an early stage of this project. We thank S. Ando, S. Desai, M. Kachelriess, M. Kaplinghat, E. Komatsu, R. Scherrer, and H. Yüksel for helpful discussions. J.F.B. was supported by NSF CAREER Grant No. PHY-0547102; N.F.B. by the Sherman Fairchild Foundation through Caltech and by the Melbourne Research Grants Scheme; and G.D.M. by DOE Grant No. DE-FG02-91ER40690. We also thank CCAPP and OSU for support.
Issue or Number:23
Record Number:CaltechAUTHORS:BEAprl07
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9277
Deposited By: Archive Administrator
Deposited On:05 Dec 2007
Last Modified:02 Oct 2019 23:58

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