Limits on neutralino dark matter by a search for upward muons in the MACRO detector

Details Limits on neutralino dark matter by a search for upward muons in the MACRO detector Limits on neutralino dark matter by a search for upward muons in the MACRO detector

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994phdt........16d&link_type=abstract

PhD Dissertation, Michigan Univ. Ann Arbor, MI United States

Astronomy and Astrophysics

Astrophysics

3

Dark Matter, Muons, Astrophysics, Cosmic Rays, Observatories, Estimating, Monopoles, Supergravity, Confidence Limits

Scientific paper

The design and operation of the MACRO (Monopole, Astrophysics, and Cosmic Ray Observatory) detector are described. Six months of MACRO data from 1993 were analysed in a search for neutrino-induced upward muons. From an initial sample of over two and one half million single muons, more than two million downward muons and 47 upward muons passed all analysis cuts. The number of observed upward muons was found to be consistent with the expected number of 55 neutrino-induced upward muons generated from atmospheric neutrinos. No evidence of high energy neutrinos from annihilations of Weakly Interacting Massive Particles (WlMPs) in the centers of the Earth and Sun was found. Flux limits of 5.5 x 10-14/sq cm/s and 17.9 x 10-14/sq cm/s (90% confidence level) were set for fluxes within 25 deg of the centers of the Earth and Sun, respectively. With five years of MACRO data these limits are estimated to improve to 2.0 x 10-14/sq cm/s and 5.0x 10-14/sq cm/s for the Earth and Sun, respectively. The expected upward muon fluxes from supergravity-based supersymmetric neutralinos were calculated and compared to the measured flux limits. None of these models was constrained by the current flux limits, and only a small number of models will be constrained by the estimated flux limits from five years of MACRO data. The neutralino models which produce the largest upward muon fluxes are those with a large higgsino content. Foreseeable future underground experiments will be able to probe neutralinos with higgsino contents as low as 0.2, but lower higgsino content neutralinos produce undetectable upward muon fluxes. However, low higgsino content neutralinos are favored by supersymmetric model building and by considerations of relic density.

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