New result of Antideuteron search in BESS-Polar II

Discussion timeslot (ZOOM-Meeting): 15. July 2021 - 18:00
ZOOM-Meeting URL: https://desy.zoom.us/j/91896950007
ZOOM-Meeting ID: 91896950007
ZOOM-Meeting Passcode: ICRC2021
Corresponding Session: https://icrc2021-venue.desy.de/channel/16-Cosmic-Ray-Antiparticles-and-Electrons-CRD-DM-GAD-MM/128
Live-Stream URL: https://icrc2021-venue.desy.de/livestream/Discussion-06/7

Abstract:
'High precision cosmic-ray antiproton fluxes reported by BESS-Polar, PAMELA and AMS-02 are overall consistent with secondary production from interactions of primary cosmic rays with the interstellar medium. This severely constrains the possibility of antiprotons of primary origin such as annihilation or decay of supersymmetric dark matter or evaporation of primordial black holes. In the case of antideuterons, secondary production in collisions is strongly suppressed, especially at low energies, because of the very low production cross-section and strict kinematic requirements compared to antiproton production. The lack of secondary background would imply that there is still plenty of room to search for primary antideuterons from novel production processes. The most sensitive reported search used BESS flight data obtained during four BESS balloon flights from 1997 to 2000. By comparison, the BESS-Polar II LDB flight in 2007/2008 accumulated cosmic-ray data in near solar minimum conditions with more than ten times the statistics of one day flight for BESS97. We will report the result of a new search for antideuterons with unprecedented sensitivity using BESS-Polar II data.'

Authors: Kenichi Sakai | for the BESS Collaboration
Collaboration: BESS

Indico-ID: 1041
Proceeding URL: https://pos.sissa.it/395/123