KEK素粒子原子核研究所・理論セミナー/Dr.Ryosuke Sato

  • 分類 理論セミナー
  • 開始 2017/06/20(火)11:00
  • 終了 2017/06/20(火)12:00
  • 会場 Kenkyu Honkan 3F Seminar Room
  • 講演タイトル Secondary astrophysical production of anti-deuteron and anti-Helium3 cosmic ray
  • 講演者 Dr.Ryosuke Sato(Weizmann Institute)
  • 言語 英語/English
  • 連絡先 倉知昌史/kurachi-AT-post.kek.jp
  • ウェブサイト
  • 食堂・売店 利用予定なし/0

概要

    ABSTRACT

Cosmic-ray anti-deuterium and anti-helium have long been suggested as probes of dark matter, as their secondary astrophysical production was thought extremely scarce. But how does one actually predict the secondary flux? Anti-nuclei are dominantly produced in pp collisions, where laboratory cross section data is lacking. We make a new attempt at tackling this problem by appealing to a scaling law of nuclear coalescence with the physical volume of the hadronic emission region. The same volume is probed by Hanbury Brown-Twiss (HBT) two-particle correlations. We demonstrate the consistency of the scaling law with systems ranging from central and off-axis AA collisions to pA collisions, spanning 3 orders of magnitude in coalescence yield. Extending the volume scaling to the pp system, HBT data allows us to make a new estimate of coalescence, that we test against preliminary ALICE pp data. For anti-helium the resulting cross section is 1-2 orders of magnitude higher than earlier estimates. The astrophysical secondary flux of anti-helium could be within reach of a five-year exposure of AMS02.