Phenomenology of dark matter annihilation into a long-lived intermediate state

被引：48

作者：

Rothstein, Ira Z. ^{[1
]}

Schwetz, Thomas ^{[2
]}

Zupan, Jure ^{[3
,4
]}

机构：

[1] Carnegie Mellon Univ, Dept Phys, Pittsburgh, PA 15213 USA

[2] Max Planck Inst Nucl Phys, D-69029 Heidelberg, Germany

[3] CERN, Dept Phys, Div Theory, CH-1211 Geneva 23, Switzerland

[4] Univ Ljubljana, Fac Math & Phys, Ljubljana 1000, Slovenia

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2009年 / 07期

关键词：

dark matter theory; cosmic ray experiments; gamma ray experiments; COSMIC-RAY ELECTRONS; POSITRONS; ABUNDANCE; ENERGIES;

D O I：

10.1088/1475-7516/2009/07/018

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We propose a scenario where Dark Matter (DM) annihilates into an intermediate state which travels a distance lambda equivalent to nu/Gamma on the order of galactic scales and then decays to Standard Model (SM) particles. The long lifetime disperses the production zone of the SM particles away from the galactic center and hence, relaxes constraints from gamma ray observations on canonical annihilation scenarios. We utilize this set up to explain the electron and positron excesses observed recently by PAMELA, ATIC and FERMI. While an explanation in terms of usual DM annihilations seems to conflict with gamma ray observations, we show that within the proposed scenario, the PAMELA/ATIC/FERMI results are consistent with the gamma ray data. The distinction from decay scenarios is discsussed and we comment on the prospects for DM production at LHC. The typical decay length lambda greater than or similar to 10 kpc of the intermediate state can have its origin from a dimension six operator suppressed by a scale Lambda similar to 10(13) GeV, which is roughly the seesaw scale for neutrino masses.

引用

页数：24

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