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Search for ultrarelativistic magnetic monopoles with the Pierre Auger observatory

We present a search for ultra-relativistic magnetic monopoles with the Pierre Auger Observatory. Such particles, possibly a relic of phase transitions in the early universe, would deposit a large amount of energy along their path through the atmosphere, comparable to that of ultrahigh-energy cosmic rays (UHECRs). The air shower profile of a magnetic monopole can be effectively distinguished by the fluorescence detector from that of standard UHECRs. No candidate was found in the data collected between 2004 and 2012, with an expected background of less than 0.1 event from UHECRs. The corresponding 90% confidence level (C.L.) upper limits on the flux of ultra-relativistic magnetic monopoles range from $10^{-19}$ (cm$^{2}$ sr s)$^{-1}$ for a Lorentz factor $��=10^9$ to $2.5 \times10^{-21}$ (cm$^{2}$ sr s)$^{-1}$ for $��=10^{12}$. These results - the first obtained with a UHECR detector - improve previously published limits by up to an order of magnitude.
Published version. Corrected title. Added journal reference and DOI. Added Report Number
- Radboud University Nijmegen Netherlands
- Federal University of Rio de Janeiro Brazil
- University of Siegen Germany
- National Scientific and Technical Research Council Argentina
- University of Milan Italy
FLUORESCENCE YIELD, fluorescence yield; energy-loss; detector; flux, Astronomy, magnetic monopole, magnetic field, Fluorescence yield, Settore FIS/04 - Fisica Nucleare e Subnucleare, UHE Cosmic Rays, info:eu-repo/classification/ddc/530, Monte Carlo, Magnetic Monopoles, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, ddc:530, Settore FIS/01 - Fisica Sperimentale, critical phenomena, FLUORESCENCE YIELD; ENERGY LOSS; DETECTOR, 520, Auger, observatory, Física nuclear, Astrophysics - High Energy Astrophysical Phenomena, spatial distribution [showers], Lorentz, atmosphere [showers], FLUX, [PHYS.ASTR.HE]Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], Nuclear and High Energy Physics, air, 539.1, UHE [cosmic radiation], FOS: Physical sciences, 530, Settore FIS/05 - Astronomia e Astrofisica, High Energy Physics, DETECTOR, fluorescence [detector], Flux, background, [ PHYS.ASTR.HE ] Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], Detector, 2207 Física Atómica y Nuclear, flux, Energy loss, Experimental High Energy Physics, relativistic, galaxy, ENERGY-LOSS, [PHYS.ASTR.HE] Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], ddc: ddc:530
FLUORESCENCE YIELD, fluorescence yield; energy-loss; detector; flux, Astronomy, magnetic monopole, magnetic field, Fluorescence yield, Settore FIS/04 - Fisica Nucleare e Subnucleare, UHE Cosmic Rays, info:eu-repo/classification/ddc/530, Monte Carlo, Magnetic Monopoles, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, ddc:530, Settore FIS/01 - Fisica Sperimentale, critical phenomena, FLUORESCENCE YIELD; ENERGY LOSS; DETECTOR, 520, Auger, observatory, Física nuclear, Astrophysics - High Energy Astrophysical Phenomena, spatial distribution [showers], Lorentz, atmosphere [showers], FLUX, [PHYS.ASTR.HE]Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], Nuclear and High Energy Physics, air, 539.1, UHE [cosmic radiation], FOS: Physical sciences, 530, Settore FIS/05 - Astronomia e Astrofisica, High Energy Physics, DETECTOR, fluorescence [detector], Flux, background, [ PHYS.ASTR.HE ] Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], Detector, 2207 Física Atómica y Nuclear, flux, Energy loss, Experimental High Energy Physics, relativistic, galaxy, ENERGY-LOSS, [PHYS.ASTR.HE] Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], ddc: ddc:530
