Implication of the PAMELA antiproton data for dark matter indirect detection at LHC

Abstract

Since the PAMELA results on the "anomalously" high positron fraction and the lack of antiproton excess in our Galaxy, there has been a tremendous number of studies advocating new types of dark matter, with larger couplings to electrons than to quarks. This raises the question of the production of dark matter particles (and heavy associated coloured states) at LHC. Here, we explore a very simple benchmark dark matter model and show that, in spite of the agreement between the PAMELA antiproton measurements and the expected astrophysical secondary background, there is room for large couplings of a WIMP candidate to heavy quarks. Contrary to what could have been naively anticipated, the PAMELA pbar/p measurements do not challenge dark matter model building, as far as the quark sector is concerned. A quarkophillic species is therefore not forbidden.Owing to these large couplings, one would expect that a new production channel opens up at the LHC, through quark--quark and quark--gluon interactions. Alas, when the PDF of the quark is taken into account, prospects for a copious production fade away.

7 pages, 2 figures, captions of some figures modified, main conclusion unchanged

References in corpus (10)

• PYTHIA 6.4 Physics and Manual
• Observation of an anomalous positron abundance in the cosmic radiation
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Likelihoods and Parameters from the WMAP data
• Measurement of the Cosmic Ray e+ plus e- spectrum from 20 GeV to 1 TeV with the Fermi Large Area Telescope
• A new measurement of the antiproton-to-proton flux ratio up to 100 GeV in the cosmic radiation
• Probing the ATIC peak in the cosmic-ray electron spectrum with H.E.S.S
• The origin of the positron excess in cosmic rays
• Constraints on WIMP Dark Matter from the High Energy PAMELA $\bar{p}/p$ data
• Measurements of 0.2 to 20 GeV/n cosmic-ray proton and helium spectra from 1997 through 2002 with the BESS spectrometer
• The PAMELA and ATIC Excesses From a Nearby Clump of Neutralino Dark Matter

Cited by in corpus (5)

• Global Constraints on Effective Dark Matter Interactions: Relic Density, Direct Detection, Indirect Detection, and Collider
• Gamma-ray Constraints on Effective Interactions of the Dark Matter
• Cosmic Antiproton Constraints on Effective Interactions of the Dark Matter
• PAMELA and FERMI-LAT limits on the neutralino-chargino mass degeneracy
• Signature of Sub GeV Dark Matter particles at LHC and TEVATRON