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DARK MATTER
The DAMPE Space Mission: Status and Main Result
Francesca Alemanno1'2'0 (on behalf of the DAMPE Collaboration) E-mail: afrancesca. alemanno@gssi. it
1Gran Sasso Science Institute (GSSI). L'Aquila, Italy 2Istituto Nazionale di Fisica Nucleare (INFN), Laboratori Nazionali del Gran Sasso. L'Aquila, Italy
Received January 15, 2022
The Dark Matter Particle Explorer (DAMPE) is a satellite orbiting at 500 km altitude in a Sun-synchronous orbit, taking data from its launch on December 17th, 2015. DAMPE is composed by several particle detectors, working together to identify incoming particles and nuclei. Main goals of the DAMPE space mission are: study of cosmic-rays and electron-positron energy spectra, gamma-ray astronomy, and indirect dark matter search. The main results achieved by DAMPE will be presented in this work.
Keywords: dark Matter, DAMPE, cosmic rays.
English version: Moscow University Physics Bulletin. 2022. 77, No. 2. Pp. 280-283.
Directional Dark Matter Search with NEWSdm
Andrey Alexandrov1'2'3'4'0 (on behalf of the NEWSdm Collaboration) E-mail: aandrey. alexandrov@na. infn. it
1I.N.F.N. sezione di Napoli,. Napoli, Italy 2Universita degli Studi di Napoli Federico II, Napoli, Italy 3National University of Science and Technology MISIS. Moscow, Russia 4Lebedev Physical Institute of the Russian Academy of Sciences. Moscow, Russia
Received January 17, 2022
Despite significant searches for dark matter, experiments have so far produced no results. The latest generation of nuclear emulsions, Nano Imaging Trackers (NIT), has nanometric precision and was created specifically for a directional DM search. The NIT emulsion is used as both the Weakly Interactive Massive Particle (WIMP) target and the nanometric-accuracy tracking device in the Nuclear Emulsion WIMP Search with Directional Measurement (NEWSdm) experiment, which is housed in the Gran Sasso underground laboratory in Italy. Detector design, the super-resolution readout technology, expected backgrounds, physics potential, and near-future plans are all discussed here.
Keywords: directional dark matter search, nano imaging tracker, nuclear emulsion, super-resolution.
English version: Moscow University Physics Bulletin. 2022. 77, No. 2. Pp. 284-287.
New Options for SUSY-kind Dark Matter
Elena Arbuzova1'2'0 E-mail: aarbuzova@uni-dubna.ru 1 Department of Higher Mathematics, Dubna State University. Dubna, 141983 Russia 2Department of Physics, Novosibirsk State University. Novosibirsk, 630090 Russia
Received August 25, 2021
In the conventional cosmology masses of the stable supersymmetric relics, candidates for the dark matter (DM) particles, should be typically below 1 TeV. This is in conflict with the LHC bounds on the low energy SUSY. However, in R2-gravity the masses of the stable particles with the interaction strength typical for SUSY could be much higher depending upon the dominant decay mode of the scalaron. We discuss the bounds on the masses of DM particles for the following dominant decay modes: to minimally coupled massless scalars, to massive fermions, and to gauge bosons.
Keywords: dark matter, R2-cosmology, scalaron decay.
English version: Moscow University Physics Bulletin. 2022. 77, No. 2. Pp. 288-290.
