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Physics beyond the Standard Model and dark matter

Research Project

Project/Area Number 20H01898
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
Research InstitutionNiigata University

Principal Investigator

ASAKA TAKEHIKO  新潟大学, 自然科学系, 教授 (70419993)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000)
Fiscal Year 2023: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2022: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2021: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords暗黒物質 / ニュートリノ / マヨラナ粒子 / ニュートリノ質量 / 右巻きニュートリノ / 実験検証 / マヨラナ性 / 新物理
Outline of Research at the Start

宇宙背景輻射の精密観測などにより、我々の宇宙に対する理解は飛躍的に進歩し、驚愕の事実が明らかになった。宇宙のエネルギーの約95%は、未知の暗黒エネルギーと暗黒物質が担っていることが判明した。特に暗黒物質の問題は、素粒子物理の標準模型に候補が含まれておらず、新物理が存在することが確実であり、その解明は現代物理学最重要課題の一つである。
そこで、本課題の核心をなす学術的「問い」は、以下の2つである。
(1)「暗黒物質を記述する基礎理論は何か?」(2)「どのように暗黒物質を実験検証するか?」
これらの問いに答え、新しい素粒子・宇宙物理を記述する理論を構築することが本研究の目的である。

Outline of Final Research Achievements

Physics beyond the Standard Model (SM) is one of the most important subjects in particle physics. Especially, various astrophysical observations show that the SM cannot describe the history and the constituents of our Universe. In this project, we investigate the problem of dark matter in connection to the origin of neutrino masses confirmed by oscillation experiments. In particular, we consider the case when the right-handed neutrino, which can explain the non-zero masses of neutrinos, is the candidate of dark matter. This particle is so-called Majorana particle, being different from ordinary quarks and leptons, and the lepton number is violated in nature. We have discussed how to confirm this Majorana property by experiments.

Academic Significance and Societal Importance of the Research Achievements

物質を構成する素粒子にはクォークとレプトンが存在する。これらの粒子はディラック粒子と呼ばれ、それぞれの粒子には質量と寿命は同じだが、電荷などが反対の反粒子が存在する。本研究で対象とした右巻きニュートリノは、粒子と反粒子が同一のマヨラナ粒子であり、これまでに実験的にその存在が確認されておらず、その探索に向けて様々な研究が進められている。本課題では、この自然界に存在する物質の根本的な性質に対する問いに答えるために、研究を進めた。特に、素粒子ニュートリノの質量獲得機構を説明する新しいマヨラナ粒子の実験的な探索に対して、重要な提言を行なった。理論研究ではあるが、実験分野にも大きな貢献を果たした。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (12 results)

All 2023 2021 2020 Other

All Int'l Joint Research (1 results) Journal Article (6 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 6 results,  Open Access: 6 results) Presentation (5 results) (of which Int'l Joint Research: 2 results,  Invited: 2 results)

  • [Int'l Joint Research] KAIST(韓国)

    • Related Report
      2020 Annual Research Report
  • [Journal Article] Neutrinoless double beta decays tell nature of right-handed neutrinos2023

    • Author(s)
      Takehiko Asaka, Hiroyuki Ishida, Kazuki Tanaka
    • Journal Title

      Journal of High Energy Physics

      Volume: 2023 Issue: 7

    • DOI

      10.1007/jhep07(2023)062

    • Related Report
      2023 Annual Research Report 2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] What if a specific neutrinoless double beta decay is absent?2021

    • Author(s)
      Asaka Takehiko、Ishida Hiroyuki、Tanaka Kazuki
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 2021 Issue: 6

    • DOI

      10.1093/ptep/ptab046

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Hiding neutrinoless double beta decay in the minimal seesaw mechanism2021

    • Author(s)
      Asaka Takehiko、Ishida Hiroyuki、Tanaka Kazuki
    • Journal Title

      Physical Review D

      Volume: 103 Issue: 1 Pages: 015014-015014

    • DOI

      10.1103/physrevd.103.015014

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Neutrino masses and gravitational wave background2021

    • Author(s)
      Asaka Takehiko、Okui Hisashi
    • Journal Title

      Physics Letters B

      Volume: 814 Pages: 136074-136074

    • DOI

      10.1016/j.physletb.2021.136074

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Lepton flavor model with modular A4 symmetry in large volume limit2020

    • Author(s)
      Asaka Takehiko、Heo Yongtae、Yoshida Takahiro
    • Journal Title

      Physics Letters B

      Volume: 811 Pages: 135956-135956

    • DOI

      10.1016/j.physletb.2020.135956

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Direct baryogenesis in the broken phase2020

    • Author(s)
      Takehiko Asaka (Niigata U.), Hiroyuki Ishida (KEK, Tsukuba), Wen Yin (KAIST, Taejon)
    • Journal Title

      Journal of High Energy Physics

      Volume: 174 Issue: 7 Pages: 1-18

    • DOI

      10.1007/jhep07(2020)174

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] バリオジェネシスと宇宙論2021

    • Author(s)
      淺賀岳彦
    • Organizer
      日本物理学会 2021年秋季大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Leptogenesis2021

    • Author(s)
      Takehiko Asaka
    • Organizer
      Flavor Physics workshop 2021
    • Related Report
      2021 Annual Research Report
  • [Presentation] The nuMSM Neutrino masses, dark matter, and baryon asymmetry of the universe2021

    • Author(s)
      Takehiko Asaka
    • Organizer
      素粒子現象論研究会2021
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] Modular symmetry and baryon asymmetry of the universe2021

    • Author(s)
      Takahiro Yoshida
    • Organizer
      Recent development of flavor symmetry
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Lepton Flavor Model with Modular Symmetry2020

    • Author(s)
      Takehiko Asaka
    • Organizer
      APCTP WORKSHOP "Recently development of Non-Abelian discrete flavor symmetries"
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited

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Published: 2020-04-28   Modified: 2025-01-30  

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