Report from the Multi-Messenger Working Group at UHECR-2014 Conference

Karg, T.; Álvarez-Muñiz, J.; Kuempel, D.; Settimo, M.; Рубцов, Г.; Troitsky, S.

doi:10.7566/jpscp.9.010021

Cited by 3 publications

(1 citation statement)

References 86 publications

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“…At the same time planned photon sensitivity improvements in the currently running experiments -Pierre Auger and Telescope Array (see Ref. [83] for details) would make them even more effective in search for the signal of heavy decaying DM.…”

Section: Discussionmentioning

confidence: 99%

Heavy decaying dark matter and large-scale anisotropy of high-energy cosmic rays

Kalashev

Kuznetsov

2017

Jetp Lett.

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We examine the role of the large-scale anisotropy of the high-energy cosmic ray distribution in a search for the heavy decaying dark matter (DM) signal. Using recent anisotropy measurements from the extensive air shower (EAS) observatories we constrain the lifetime of the DM particles with masses 10 7 ≤ M X ≤ 10 16 GeV. These constraints appear to be weaker than that obtained with the high energy gamma-ray limits. We also estimate the desired precision level for the anisotropy measurements to discern the decaying DM signal marginally allowed by the gammaray limits and discuss the prospects of the DM search with the modern EAS facilities.Technically the heavy DM candidate X has two main parameters: mass M X and lifetime τ . Absolutely stable X-particles are not so interesting from the experimental point of view since its annihilation cross-section is bounded by unitarity: σ ann. X ∼ 1/M 2 X , which makes its indirect detection impossible for the todays experiments [30]. There are several sources of constraints for the heavy DM parameters. The mass is subjected to cosmological constraints [8,10,[31][32][33][34], and the lifetime of the DM particles can be effectively constrained with the observed fluxes of various high-energy particles or with the upper limit on these fluxes. For example, in Ref.[35] the constraints have been put using the shape of charged cosmic-ray spectra. However, with the modern cosmic ray data this method is not as effective in constraining τ as gamma-ray [27,[36][37][38][39] and neutrino [26,27] data.Another observable sensitive to the heavy DM decay is the cosmic-ray anisotropy. Apart from the DM searches, the anisotropy is a powerful tool for the elucidation of the cosmic-ray origin and propagation. In particular it is useful in study of the galactic magnetic field structure imprinted in cosmic rays [40][41][42][43] or in search for the extended cosmic-ray sources such as large scale structure [44][45][46][47]. While for TeV-PeV energies the existence of large-scale anisotropy has been confirmed by several experiments [48,49], for higher energies the deviations from isotropy are either not observed or have low significance [50][51][52][53][54][55]. In the present work we use the upper-limits on the cosmic ray flux anisotropy mentioned above to obtain the conservative constrains on the lifetime of the heavy DM with masses 10 7 ≤ M X ≤ 10 16 GeV. We use the parameters of DM allowed by the gamma-ray and neutrino limits to reveal the possible DM contribution to the anisotropy observables. This study complements our previous works [26,39], where constraints on the heavy decaying DM lifetime were obtained using the high-energy gamma-ray and neutrino flux upper limits.

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Section: Discussionmentioning

confidence: 99%

Heavy decaying dark matter and large-scale anisotropy of high-energy cosmic rays

Kalashev

Kuznetsov

2017

Jetp Lett.

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Search for photons with energies above 10¹⁸eV using the hybrid detector of the Pierre Auger Observatory

Aab

Abreu

Aglietta

et al. 2017

J. Cosmol. Astropart. Phys.

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A search for ultra-high energy photons with energies above 1 EeV is performed using nine years of data collected by the Pierre Auger Observatory in hybrid operation mode. An unprecedented separation power between photon and hadron primaries is achieved by combining measurements of the longitudinal air-shower development with the particle content at ground measured by the fluorescence and surface detectors, respectively. Only three photon candidates at energies 1 − 2 EeV are found, which is compatible with the expected hadroninduced background. Upper limits on the integral flux of ultra-high energy photons of 0.027, 0.009, 0.008, 0.008 and 0.007 km −2 sr −1 yr −1 are derived at 95% C.L. for energy thresholds of 1, 2, 3, 5 and 10 EeV. These limits bound the fractions of photons in the all-particle integral flux below 0.1%, 0.15%, 0.33%, 0.85% and 2.7%. For the first time the photon fraction at EeV energies is constrained at the sub-percent level. The improved limits are below the flux of diffuse photons predicted by some astrophysical scenarios for cosmogenic photon production. The new results rule-out the early top-down models − in which ultra-high energy cosmic rays are produced by, e.g., the decay of super-massive particles − and challenge the most recent super-heavy dark matter models.

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Lower limit on the ultrahigh-energy proton-to-helium ratio from the measurements of the tail of the Xmax distribution

2018

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Report from the Multi-Messenger Working Group at UHECR-2014 Conference

Cited by 3 publications

References 86 publications

Heavy decaying dark matter and large-scale anisotropy of high-energy cosmic rays

Heavy decaying dark matter and large-scale anisotropy of high-energy cosmic rays

Search for photons with energies above 10¹⁸eV using the hybrid detector of the Pierre Auger Observatory

Lower limit on the ultrahigh-energy proton-to-helium ratio from the measurements of the tail of the Xmax distribution

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Report from the Multi-Messenger Working Group at UHECR-2014 Conference

Cited by 3 publications

References 86 publications

Heavy decaying dark matter and large-scale anisotropy of high-energy cosmic rays

Heavy decaying dark matter and large-scale anisotropy of high-energy cosmic rays

Search for photons with energies above 1018eV using the hybrid detector of the Pierre Auger Observatory

Lower limit on the ultrahigh-energy proton-to-helium ratio from the measurements of the tail of the Xmax distribution

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Search for photons with energies above 10¹⁸eV using the hybrid detector of the Pierre Auger Observatory