Presented By: HEP - Astro Seminars
HEP-Astro Seminar | Search for Antideuterons in Cosmic Ray Data from AMS-02 and Understanding the Deuteron/Antideuteron Production Mechanism from NA61 Data
Amaresh Datta (University of Hawaii at Manoa)
Detection of antideuterons produced from dark matter annihilations or decays are complementary to direct detection techniques that probe the scattering cross-sections of dark matter. Low energy antideuterons are a most interesting probe because of their ultra-low astrophysical background, the dominant source of which are the interactions between cosmic-ray protons and interstellar medium (mostly H, He). High production threshold and a steep cosmic-ray spectrum, however, ensure a low background from such processes. We search for antideuterons in cosmic-ray data recorded by Alpha Magnetic Spectrometer (AMS-02) on board the International Space Station (ISS). Production of antideuterons and deuterons in nuclear interactions is a complex non-perturbative process. Using NA61/SHINE data (at CERN SPS) from p+p interactions with 158 GeV/c beam on liquid H target, we are working towards measurements of cross-sections of deuteron production. Comparison between cross-section measurements with predictions using models of coalescence between protons and neutrons will provide insight into the production mechanism and will help improve models. Extending the analysis techniques, measurements of antideuteron cross-sections will be helpful in limiting astrophysical background in AMS-02 data.
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