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Title: PAMELA and FERMI limits on the neutralino-chargino mass degeneracy

Abstract

Searches for Dark Matter (DM) particles with indirect detection techniques have reached important milestones with the precise measurements of the anti-proton ( p-bar ) and gamma-ray spectra, notably by the PAMELA and FERMI-LAT experiments. While the γ-ray results have been used to test the thermal Dark Matter hypothesis and constrain the Dark Matter annihilation cross section into Standard Model (SM) particles, the anti-proton flux measured by the PAMELA experiment remains relatively unexploited. Here we show that the latter can be used to set a constraint on the neutralino-chargino mass difference. To illustrate our point we use a Supersymmetric model in which the gauginos are light, the sfermions are heavy and the Lightest Supersymmetric Particle (LSP) is the neutralino. In this framework the W{sup +}W{sup −} production is expected to be significant, thus leading to large p-bar and γ-ray fluxes. After determining a generic limit on the Dark Matter pair annihilation cross section into W{sup +}W{sup −} from the p-bar data only, we show that one can constrain scenarios in which the neutralino-chargino mass difference is as large as ≅ 20 GeV for a mixed neutralino (and intermediate choices of the p-bar propagation scheme). This result is consistent with the limitmore » obtained by using the FERMI-LAT data. As a result, we can safely rule out the pure wino neutralino hypothesis if it is lighter than 450 GeV and constitutes all the Dark Matter.« less

Authors:
;  [1];  [2];  [3];  [4]
  1. LAPTh, U. de Savoie, CNRS, BP 110, Annecy-le-Vieux F-74941 (France)
  2. Institute for Particle Physics Phenomenology, University of Durham, Durham, DH1 3LE (United Kingdom)
  3. CERN Theory Division, CH-1211 Genève (Switzerland)
  4. Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow 119992 (Russian Federation)
Publication Date:
OSTI Identifier:
22279813
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2012; Journal Issue: 11; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANNIHILATION; ANTIPROTONS; ASTROPHYSICS; COSMOLOGY; CROSS SECTIONS; GAMMA SPECTRA; GEV RANGE; MASS DIFFERENCE; NONLUMINOUS MATTER; REST MASS; SPARTICLES; STANDARD MODEL; SUPERSYMMETRY; VISIBLE RADIATION; W MINUS BOSONS; W PLUS BOSONS

Citation Formats

Bélanger, Geneviève, Silva, Jonathan Da, Boehm, Céline, Cirelli, Marco, and Pukhov, Alexander, E-mail: belanger@lapp.in2p3.fr, E-mail: c.m.boehm@durham.ac.uk, E-mail: marco.cirelli@cea.fr, E-mail: dasilva@lapp.in2p3.fr, E-mail: pukhov@lapp.in2p3.fr. PAMELA and FERMI limits on the neutralino-chargino mass degeneracy. United States: N. p., 2012. Web. doi:10.1088/1475-7516/2012/11/028.
Bélanger, Geneviève, Silva, Jonathan Da, Boehm, Céline, Cirelli, Marco, & Pukhov, Alexander, E-mail: belanger@lapp.in2p3.fr, E-mail: c.m.boehm@durham.ac.uk, E-mail: marco.cirelli@cea.fr, E-mail: dasilva@lapp.in2p3.fr, E-mail: pukhov@lapp.in2p3.fr. PAMELA and FERMI limits on the neutralino-chargino mass degeneracy. United States. doi:10.1088/1475-7516/2012/11/028.
Bélanger, Geneviève, Silva, Jonathan Da, Boehm, Céline, Cirelli, Marco, and Pukhov, Alexander, E-mail: belanger@lapp.in2p3.fr, E-mail: c.m.boehm@durham.ac.uk, E-mail: marco.cirelli@cea.fr, E-mail: dasilva@lapp.in2p3.fr, E-mail: pukhov@lapp.in2p3.fr. Thu . "PAMELA and FERMI limits on the neutralino-chargino mass degeneracy". United States. doi:10.1088/1475-7516/2012/11/028.
@article{osti_22279813,
title = {PAMELA and FERMI limits on the neutralino-chargino mass degeneracy},
author = {Bélanger, Geneviève and Silva, Jonathan Da and Boehm, Céline and Cirelli, Marco and Pukhov, Alexander, E-mail: belanger@lapp.in2p3.fr, E-mail: c.m.boehm@durham.ac.uk, E-mail: marco.cirelli@cea.fr, E-mail: dasilva@lapp.in2p3.fr, E-mail: pukhov@lapp.in2p3.fr},
abstractNote = {Searches for Dark Matter (DM) particles with indirect detection techniques have reached important milestones with the precise measurements of the anti-proton ( p-bar ) and gamma-ray spectra, notably by the PAMELA and FERMI-LAT experiments. While the γ-ray results have been used to test the thermal Dark Matter hypothesis and constrain the Dark Matter annihilation cross section into Standard Model (SM) particles, the anti-proton flux measured by the PAMELA experiment remains relatively unexploited. Here we show that the latter can be used to set a constraint on the neutralino-chargino mass difference. To illustrate our point we use a Supersymmetric model in which the gauginos are light, the sfermions are heavy and the Lightest Supersymmetric Particle (LSP) is the neutralino. In this framework the W{sup +}W{sup −} production is expected to be significant, thus leading to large p-bar and γ-ray fluxes. After determining a generic limit on the Dark Matter pair annihilation cross section into W{sup +}W{sup −} from the p-bar data only, we show that one can constrain scenarios in which the neutralino-chargino mass difference is as large as ≅ 20 GeV for a mixed neutralino (and intermediate choices of the p-bar propagation scheme). This result is consistent with the limit obtained by using the FERMI-LAT data. As a result, we can safely rule out the pure wino neutralino hypothesis if it is lighter than 450 GeV and constitutes all the Dark Matter.},
doi = {10.1088/1475-7516/2012/11/028},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 11,
volume = 2012,
place = {United States},
year = {2012},
month = {11}
}