Continuum photon spectrum from Z1Z1 annihilations in universal extra dimensions
2012 (English)In: Physics Letters B, ISSN 0370-2693, Vol. 706, no 4-5, 329-332 p.Article in journal (Refereed) Published
We calculate the continuum photon spectrum from the pair annihilation of a Z1 LKP in non-minimal universal extra dimensions. We find that, due to the preferred annihilation into W+ W- pairs, the continuum flux of collinear photons is relatively small compared to the standard case of the B1 as the LKP. This conclusion applies in particular to the spectral endpoint, where also the additional fermionic contributions are not large enough to increase the flux significantly. When searching for the line signal originating from Z1 Z1 annihilations, this is actually a perfect situation, since the continuum signal can be regarded as background to the smoking gun signature of a peak in the photon flux at an energy that is nearly equal to the mass of the dark matter particle. This signal, in combination with (probably) a non-observation of the continuum signal at lower photon energies, constitutes a perfect handle to probe the hypothesis of the Z1 LKP being the dominant component of the dark matter observed in the Universe.
Place, publisher, year, edition, pages
Elsevier B.V. , 2012. Vol. 706, no 4-5, 329-332 p.
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:kth:diva-50386DOI: 10.1016/j.physletb.2011.11.018ISI: 000299756800011ScopusID: 2-s2.0-84155165683OAI: oai:DiVA.org:kth-50386DiVA: diva2:461706
FunderSwedish Research Council, 621-2008-4210
This is the author’s version of a work that was accepted for publication in Physics Letters B. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Physics Letters B, VOL 706, ISSUE 4-5, (15 November 2011) DOI:10.1016/j.physletb.2011.11.018. QC 20120223 Correction ISI: 000306305000041 Doi: 10.1016/j.physletb.2012.05.0592012-02-232011-12-052013-04-25Bibliographically approved