Precision Measurements of High-Energy Cosmic Gamma-Ray Emission with the GAMMA-400 Gamma-Ray Telescope

Galper, A. M.; Suchkov, S.; Topchiev, N. P.; Arkhangelskaja, I. V.; Arkhangelskiy, A. I.; Bakaldin, A.; Gusakov, Y.; Dalkarov, O. D.; Zverev, V. G.; Kadilin, V. V.; Leonov, A.; Naumov, P. Yu.; Runtso, M. F.; Kheymits, M. D.; Yurkin, Y. T.

doi:10.1134/s1063778817060096

Cited by 9 publications

(8 citation statements)

References 5 publications

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“…Interestingly the predicted values for σv γγ are not far below the averaged upper limit, leading to the expectation that an observable gamma-ray line from the galactic center, of energy ∼ 64 GeV, should be correlated with the LEP and CMS anomalies. The predicted line will be tested by the next generation gamma-ray telescope GAMMA-400 [103].…”

Section: V4 Gamma-ray Line Searchesmentioning

confidence: 99%

Pseudo-Goldstone dark matter confronts cosmic ray and collider anomalies

Cline

Toma

2019

Phys. Rev. D

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Persistent excesses in the spectra of gamma rays from the galactic center and cosmic ray antiprotons can be explained by dark matter of mass 50 ∼ 65 GeV annihilating into b quarks, but this is typically hard to reconcile with direct detection constraints. We resolve this tension using a simple class of models, where dark matter is a pseudo-Nambu-Goldstone boson, having naturally momentum-suppressed couplings to nuclei. Exploring the parameter space of the model, we find that it can explain the cosmic ray anomalies while remaining compatible with constraints from the relic abundance and annihilation in dwarf spheroidal galaxies. In certain regions of parameter space, the Higgs-dark matter coupling can help stabilize the Higgs potential up to the Planck scale. The scalar partner of the dark matter is an extra Higgs boson, that can explain a tentative diphoton excess observed by CMS, and an excess of bb signal from LEP, if its mass is ∼ 96 GeV and the model is extended to include a heavy scalar quark. This extended model predicts a monochromatic gamma-ray line near 64 GeV, at a level close to current experimental sensitivity, from dark matter annihilations in the galaxy.

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Section: V4 Gamma-ray Line Searchesmentioning

confidence: 99%

Pseudo-Goldstone dark matter confronts cosmic ray and collider anomalies

Cline

Toma

2019

Phys. Rev. D

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“…The methods to separate electron from protons presented in [6] are based on the difference of the development of hadronic and electromagnetic showers inside the instrument. For the current physical scheme the rejection factor for vertical protons is about 3×10 5 .…”

Section: The Gamma-400 Performancementioning

confidence: 93%

“…The GAMMA-400 gamma-ray telescope will be installed onboard the Russian space astrophysical observatory [3][4][5]. The GAMMA-400 main scientific goals are: precise uninterrupted up to hundred days measurements of Galactic Center, Fermi Bubbles, Crab, Vela, Cygnus, Geminga, Sun, and other regions, extended and point gamma-ray sources, diffuse gamma rays, dark matter searching, measuring electron + positron fluxes with unprecedented angular (∼ 0.01 • at E γ = 100 GeV) and energy (∼ 1% at E γ = 100 GeV) resolutions.…”

Section: The Gamma-400 Gamma-ray Telescopementioning

confidence: 99%

High-energy gamma- and cosmic-ray observations with future space-based GAMMA-400 gamma-ray telescope

et al. 2019

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The future space-based GAMMA-400 gamma-ray telescope will be installed on the Navigator platform of the Russian Astrophysical Observatory. A highly elliptical orbit will provide observations for 7-10 years of many regions of the celestial sphere continuously for a long time (~ 100 days). GAMMA-400 will measure gamma-ray fluxes in the energy range from ~ 20 MeV to several TeV and electron + positron fluxes up to ~ 20 TeV. GAMMA-400 will have an excellent separation of gamma rays from the background of cosmic rays and electrons + positrons from protons and an unprecedented angular (~ 0.01° at Eγ = 100 GeV) and energy (~ 1% at Eγ = 100 GeV) resolutions better than for Fermi-LAT, as well as ground-based facilities, by a factor of 5-10. Observations of GAMMA-400 will provide new fundamental data on discrete sources and spectra of gamma-ray emission and electrons + positrons, as well as the nature of dark matter.

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“…Building on the success of current-generation γ-ray detectors such as Fermi-LAT [108], AMS-100 will allow detailed studies of γ-ray sources and the diffuse γ-ray emission up to the 10 TeV barrel, based on a Geant4 simulation of the multiple scattering in the detector material, and for the endcap detector which follows the design of GAMMA-400 [112]. The resolution function of Fermi-LAT [113] is shown for comparison.…”

Section: High-energy Gamma Raysmentioning

confidence: 99%

AMS-100: The next generation magnetic spectrometer in space – An international science platform for physics and astrophysics at Lagrange point 2

Schael

Atanasyan

Berdugo

et al. 2019

Nuclear Instruments and Methods in Physics Research Section A:

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The next generation magnetic spectrometer in space, AMS-100, is designed to have a geometrical acceptance of 100 m 2 sr and to be operated for at least ten years at the Sun-Earth Lagrange Point 2. Compared to existing experiments, it will improve the sensitivity for the observation of new phenomena in cosmic rays, and in particular in cosmic antimatter, by at least a factor of 1000. The magnet design is based on high temperature superconductor tapes, which allow the construction of a thin solenoid with a homogeneous magnetic field of 1 Tesla inside. The inner volume is instrumented with a silicon tracker reaching a maximum detectable rigidity of 100 TV and a calorimeter system that is 70 radiation lengths deep, equivalent to four nuclear interaction lengths, which extends the energy reach for cosmic-ray nuclei up to the PeV scale, i.e. beyond the cosmic-ray knee. Covering most of the sky continuously, AMS-100 will detect high-energy gamma rays in the calorimeter system and by pair conversion in the thin solenoid, reconstructed with excellent angular resolution in the silicon tracker.

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Precision Measurements of High-Energy Cosmic Gamma-Ray Emission with the GAMMA-400 Gamma-Ray Telescope

Cited by 9 publications

References 5 publications

Pseudo-Goldstone dark matter confronts cosmic ray and collider anomalies

Pseudo-Goldstone dark matter confronts cosmic ray and collider anomalies

High-energy gamma- and cosmic-ray observations with future space-based GAMMA-400 gamma-ray telescope

AMS-100: The next generation magnetic spectrometer in space – An international science platform for physics and astrophysics at Lagrange point 2

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