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Physical Review D

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Role of electroweak bremsstrahlung for indirect dark matter signatures

M. Kachelrieß¹, P. D. Serpico^2,3, and M. Aa. Solberg¹

¹Institutt for Fysikk, NTNU, N-7491 Trondheim, Norway
²Physics Department, Theory Division, CERN, CH-1211 Geneva 23, Switzerland
³LAPTH, UMR 5108, 9 Chemin de Bellevue-BP 110, 74941 Annecy-Le-Vieux, France

Phys. Rev. D 80, 123533 – Published 29 December, 2009

DOI: https://doi.org/10.1103/PhysRevD.80.123533

Abstract

Interpretations of indirect searches for dark matter (DM) require theoretical predictions for the annihilation or decay rates of DM into stable particles of the standard model. These predictions include usually only final states accessible as lowest order tree-level processes, with electromagnetic bremsstrahlung and the loop-suppressed two gamma-ray line as exceptions. We show that this restriction may lead to severely biased results for DM tailored to produce only leptons in final states and with mass in the TeV range. For such models, unavoidable electroweak bremsstrahlung of $Z$ and $W$ -bosons has a significant influence both on the branching ratio and the spectral shape of the final state particles. We work out the consequences for two situations: First, the idealized case where DM annihilates at tree level with 100% branching ratio into neutrinos. For a given cross section, this leads eventually to “minimal yields” of photons, electrons, positrons, and antiprotons. Second, the case where the only allowed two-body final states are electrons. The latter case is typical of models aimed at fitting cosmic ray $e^{-}$ and $e^{+}$ data. We find that the multimessenger signatures of such models can be significantly modified with respect to results presented in the literature.

Article Text

References (38)

J. F. Beacom, N. F. Bell, and G. D. Mack, Phys. Rev. Lett. 99, 231301 (2007).
H. Yuksel, S. Horiuchi, J. F. Beacom, and S. Ando, Phys. Rev. D 76, 123506 (2007).
S. Palomares-Ruiz, Phys. Lett. B 665, 50 (2008).
V. Berezinsky, M. Kachelrieß, and S. Ostapchenko, Phys. Rev. Lett. 89, 171802 (2002).
M. Kachelrieß and P. D. Serpico, Phys. Rev. D 76, 063516 (2007).
N. F. Bell, J. B. Dent, T. D. Jacques, and T. J. Weiler, Phys. Rev. D 78, 083540 (2008).
O. Adriani et al., Nature (London) 458, 607 (2009).
O. Adriani et al., Phys. Rev. Lett. 102, 051101 (2009).
A. A. Abdo et al. (Fermi-LAT Collaboration), Phys. Rev. Lett. 102, 181101 (2009).
D. Grasso et al. (Fermi-LAT Collaboration), Astropart. Phys. 32, 140 (2009).
Markus Ackermann, Observation of the Extragalactic Diffuse Continuum Gamma-ray Emission with Fermi LAT, http://www-conf.slac.stanford.edu/tevpa09/Talks.asp.
M. Cirelli, M. Kadastik, M. Raidal, and A. Strumia, Nucl. Phys. B813, 1 (2009).
L. Bergstrom, Phys. Lett. B 225, 372 (1989); R. Flores, K. A. Olive, and S. Rudaz, 232, 377 (1989).
We used for the evaluation of the trace the package of T. H. West, Comput. Phys. Commun. 77, 286 (1993).
C. Amsler et al. (Particle Data Group), Phys. Lett. B 667, 1 (2008).
T. Bringmann, L. Bergstrom, and J. Edsjo, J. High Energy Phys. 01 (2008) 049.
V. Barger, Y. Gao, W. Y. Keung, and D. Marfatia, Phys. Rev. D 80, 063537 (2009).
J. B. Dent, R. J. Scherrer, and T. J. Weiler, Phys. Rev. D 78, 063509 (2008).
For a possible connection to anomalous Sudakov form factors see M. Ciafaloni, P. Ciafaloni, and D. Comelli, arXiv:0909.1657.
A. Dobado, M. J. Herrero, and S. Penaranda, arXiv:hep-ph/9806488; Eur. Phys. J. C 12, 673 (2000); V. Berezinsky, M. Kachelrieß, and M. A. Solberg, Phys. Rev. D 78, 123535 (2008).
J. Alwall et al., J. High Energy Phys. 09 (2007) 028; MadGraph Version 4, http://madgraph.hep.uiuc.edu/.
M. Bahr et al., Eur. Phys. J. C 58, 639 (2008); The Herwig $++$ Event Generator, http://projects.hepforge.org/herwig/.
J. F. Navarro, C. S. Frenk, and S. D. M. White, Astrophys. J. 462, 563 (1996).
R. Catena and P. Ullio, arXiv:0907.0018.
S. Gillessen, F. Eisenhauer, S. Trippe, T. Alexander, R. Genzel, F. Martins, and T. Ott, Astrophys. J. 692, 1075 (2009).
F. Donato, N. Fornengo, D. Maurin, and P. Salati, Phys. Rev. D 69, 063501 (2004).
M. Cirelli, R. Franceschini, and A. Strumia, Nucl. Phys. B800, 204 (2008).
C. Amsler et al. (Particle Data Group), Phys. Lett. B 667, 1 (2008).
J. Hisano, S. Matsumoto, O. Saito, and M. Senami, Phys. Rev. D 73, 055004 (2006).
T. Delahaye, R. Lineros, F. Donato, N. Fornengo, and P. Salati, Phys. Rev. D 77, 063527 (2008).
S. Desai et al. (Super-Kamiokande Collaboration), Phys. Rev. D 70, 083523 (2004); 70, 109901(E) (2004).
P. D. Serpico and D. Hooper, New J. Phys. 11, 105010 (2009).
S. Dodelson, D. Hooper, and P. D. Serpico, Phys. Rev. D 77, 063512 (2008).
P. D. Serpico and G. Zaharijas, Astropart. Phys. 29, 380 (2008).
E. A. Baltz et al., J. Cosmol. Astropart. Phys. 07 (2008) 013.
F. Aharonian et al. (HESS Collaboration), Phys. Rev. Lett. 101, 261104 (2008).
The Alpha Magnetic Spectrometer Experiment, http://ams.cern.ch/.
A. Falkowski, J. Juknevich, and J. Shelton, arXiv:0908.1790.