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2015 Fiscal Year Annual Research Report

ニュートリノで探る素粒子の起源と宇宙の構造

Planned Research

Project AreaUnification and Development of the Neutrino Science Frontier
Project/Area Number 25105011
Research InstitutionHigh Energy Accelerator Research Organization

Principal Investigator

北野 龍一郎  大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 教授 (50543451)

Co-Investigator(Kenkyū-buntansha) 大河内 豊  九州大学, 学内共同利用施設等, 准教授 (40599990)
伊部 昌宏  東京大学, 宇宙線研究所, 准教授 (50599008)
Project Period (FY) 2013-06-28 – 2018-03-31
Keywords素粒子論
Outline of Annual Research Achievements

本研究は、ニュートリノ物理を足がかりに素粒子現象論・宇宙論・超弦理論の3つの方向から素粒子・宇宙・時空の背後にある究極理論に迫るものである。
本年度は、新しいバリオン数生成のシナリオや余剰次元のコンパクト化による超対称性の破れのシナリオ、宇宙においてバリオンが触媒として働き相転移を起こす可能性など、多方面の研究で様々な研究結果が得られた。
宇宙線研グループはレントン数が自発的に破れてニュートリノの質量が生成されるシナリオには、マヨロンと呼ばれる南部ゴールドストーン粒子が存在する。宇宙初期において、このマヨロン場が振動をおこし、それを通じて自発的にレプトン数が生成される可能性を指摘し、数値的にそれが宇宙のバリオン数非対称性を説明しうることを示した。
九州大学グループは、超弦理論におけるDブレーンの力学に基づく考察から、ゲージ理論におけるソリトンの生成によって相転移(真空の崩壊)が起りうることを示した。これにより、これまで考えられてきたトンネル効果による真空の崩壊率よりもずっとおおきな崩壊率になりうることを示した。
KEKグループは、超対称性が余剰次元のコンパクトの際に破れるシナリオにおいて、ヒッグス質量がカルツァ=クラインモードの寄与によって大きく補正を受けることを指摘した。これにより、超対称粒子の現れる質量スケールがこれまでの評価よりも小さくなり、LHC実験で完全に検証できることを示した。
他にも、ヒッグス粒子の非標準相互作用によるレプトンフレーバーの破れの効果、インフレーション模型の研究、格子QCDによるアクシオンの研究、LHC実験でヒントが得られている新粒子に関する研究など、様々な研究成果があがっている。

Current Status of Research Progress
Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

素粒子理論の様々な可能性について多方面からの解析により、興味深い結果が得られている。ニュートリノの質量生成機構と宇宙論の関係や、それにとどまらないヒッグス粒子の物理、超弦理論などにおいて独自の結果を得て、順調に進展している。

Strategy for Future Research Activity

今後も、様々な可能性を探りつつ、素粒子物理全体像へのアプローチをはかる。特に、新しい暗黒物質の可能性、バリオン数非対称性生成の可能性、フレーバー実験とニュートリノ振動実験の関係性、LHC実験結果を踏まえた大統一理論と陽子崩壊の関係など、多くのテーマに着手する。

  • Research Products

    (49 results)

All 2016 2015 Other

All Int'l Joint Research (4 results) Journal Article (19 results) (of which Int'l Joint Research: 7 results,  Peer Reviewed: 19 results,  Open Access: 19 results,  Acknowledgement Compliant: 18 results) Presentation (21 results) (of which Int'l Joint Research: 12 results,  Invited: 9 results) Remarks (1 results) Funded Workshop (4 results)

  • [Int'l Joint Research] University of California, Berkeley/Harvard University(米国)

    • Country Name
      U.S.A.
    • Counterpart Institution
      University of California, Berkeley/Harvard University
  • [Int'l Joint Research] Weizmann Institute(イスラエル)

    • Country Name
      ISRAEL
    • Counterpart Institution
      Weizmann Institute
  • [Int'l Joint Research] KIT Karlsruhe(ドイツ)

    • Country Name
      GERMANY
    • Counterpart Institution
      KIT Karlsruhe
  • [Int'l Joint Research] National Central University(台湾)

    • Country Name
      その他の国・地域
    • Counterpart Institution
      National Central University
  • [Journal Article] Enhanced Higgs Mass in Compact Supersymmetry2016

    • Author(s)
      Kohsaku Tobioka, Ryuichiro Kitano, Hitoshi Murayama
    • Journal Title

      Journal of High Energy Physics

      Volume: 1604 Pages: 025

    • DOI

      10.1007/JHEP04(2016)025

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] ATLAS on-Z Excess via gluino-Higgsino-singlino decay chains in the NMSSM2016

    • Author(s)
      Keisuke Harigaya, Masahiro Ibe, Teppei Kitahara
    • Journal Title

      Journal of High Energy Physics

      Volume: 1601 Pages: 030

    • DOI

      10.1007/JHEP01(2016)030

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Revisiting R-invariant Direct Gauge Mediation2016

    • Author(s)
      Cheng-Wei Chiang, Keisuke Harigaya, Masahiro Ibe, Tsutomu T. Yanagida
    • Journal Title

      Journal of High Energy Physics

      Volume: 1603 Pages: 145

    • DOI

      10.1007/JHEP03(2016)145

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Prospects for Spin-1 Resonance Search at 13 TeV LHC and the ATLAS Diboson Excess2016

    • Author(s)
      Tomohiro Abe, Teppei Kitahara, Mihoko M. Nojiri
    • Journal Title

      Journal of High Energy Physics

      Volume: 1602 Pages: 084

    • DOI

      10.1007/JHEP02(2016)084

    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Revisiting the Minimal Chaotic Inflation Model2016

    • Author(s)
      Keisuke Harigaya, Masahiro Ibe, Masahiro Kawasaki, Tsutomu T. Yanagida
    • Journal Title

      Physics Letters B

      Volume: 756 Pages: 113-117

    • DOI

      10.1016/j.physletb.2016.03.001

    • Peer Reviewed / Open Access
  • [Journal Article] Lepton flavor violating Z-boson couplings from nonstandard Higgs interactions2015

    • Author(s)
      Toru Goto, Ryuichiro Kitano, Shingo Mori
    • Journal Title

      Physical Review D

      Volume: 92 Pages: 075021

    • DOI

      10.1103/PhysRevD.92.075021

    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Diboson Resonance as a Portal to Hidden Strong Dynamics2015

    • Author(s)
      Cheng-Wei Chiang, Hajime Fukuda, Keisuke Harigaya, Masahiro Ibe, Tsutomu T. Yanagida
    • Journal Title

      Journal of High Energy Physics

      Volume: 1511 Pages: 015

    • DOI

      10.1007/JHEP11(2015)015

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Dynamics of Peccei-Quinn Breaking Field after Inflation and Axion Isocurvature Perturbations2015

    • Author(s)
      Keisuke Harigaya, Masahiro Ibe, Masahiro Kawasaki, Tsutomu T. Yanagida
    • Journal Title

      Journal of Cosmology and Astroparticle Physics

      Volume: 1511 Pages: 003

    • DOI

      10.1088/1475-7516/2015/11/003

    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] 2 TeV Walking Technirho at LHC?2015

    • Author(s)
      Hidenori S. Fukano, Masafumi Kurachi, Shinya Matsuzaki, Koji Terashi, Koichi Yamawaki
    • Journal Title

      Physics Letters B

      Volume: 750 Pages: 259-265

    • DOI

      10.1016/j.physletb.2015.09.023.

    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Topology in QCD and the axion abundance2015

    • Author(s)
      Ryuichiro Kitano, Norikazu Yamada
    • Journal Title

      Journal of High Energy Physics

      Volume: 1510 Pages: 136

    • DOI

      10.1007/JHEP10(2015)136

    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Cosmological Selection of Multi-TeV Supersymmetry2015

    • Author(s)
      Keisuke Harigaya, Masahiro Ibe, Kai Schmitz, Tsutomu T. Yanagida
    • Journal Title

      Physics Letters B

      Volume: 749 Pages: 298-303

    • DOI

      10.1016/j.physletb.2015.07.073

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Peccei-Quinn Symmetry from Dynamical Supersymmetry Breaking2015

    • Author(s)
      Keisuke Harigaya, Masahiro Ibe, Kai Schmitz, Tsutomu T. Yanagida
    • Journal Title

      Physical Review D

      Volume: 92 Pages: 075003

    • DOI

      10.1103/PhysRevD.92.075003

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Mass-splitting between haves and have-nots --- symmetry vs. Grand Unified Theory2015

    • Author(s)
      Keisuke Harigaya, Masahiro Ibe, Motoo Suzuki
    • Journal Title

      Journal of High Energy Physics

      Volume: 1509 Pages: 155

    • DOI

      10.1007/JHEP09(2015)155

    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Model of visible QCD axion2015

    • Author(s)
      Hajime Fukuda, Keisuke Harigaya, Masahiro Ibe, Tsutomu T. Yanagida
    • Journal Title

      Physical Review D

      Volume: 92 Pages: 015021

    • DOI

      10.1103/PhysRevD.92.015021

    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Wino Dark Matter in light of the AMS-02 2015 Data2015

    • Author(s)
      Masahiro Ibe, Shigeki Matsumoto, Satoshi Shirai, Tsutomu T. Yanagida
    • Journal Title

      Physical Review D

      Volume: 91 Pages: 111701

    • DOI

      10.1103/PhysRevD.91.111701

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Spontaneous thermal Leptogenesis via Majoron oscillation2015

    • Author(s)
      Masahiro Ibe, Kunio Kaneta
    • Journal Title

      Physical Review D

      Volume: 92 Pages: 035019

    • DOI

      10.1103/PhysRevD.92.035019

    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Gravitational Correction to Fuzzy String in Metastable Brane Configuration2015

    • Author(s)
      Aya Kasai, Yutaka Ookouchi
    • Journal Title

      Journal of High Energy Physics

      Volume: 1506 Pages: 098

    • DOI

      10.1007/JHEP06(2015)098

    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Diquark bound states with a completely crossed ladder truncation2015

    • Author(s)
      Go Mishima, Ryusuke Jinno, Teppei Kitahara
    • Journal Title

      Physical Review D

      Volume: 91 Pages: 076011

    • DOI

      10.1103/PhysRevD.91.076011

    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Vacuum Alignment of the Top-Mode Pseudo-Nambu-Goldstone Boson Higgs Model2015

    • Author(s)
      Hidenori S. Fukano, Masafumi Kurachi, Shinya Matsuzaki
    • Journal Title

      Physical Review D

      Volume: 91 Pages: 115005

    • DOI

      10.1103/PhysRevD.91.115005

    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Presentation] ヒッグス粒子 -標準模型を超えた物理の幕開け-2016

    • Author(s)
      北野龍一郎
    • Organizer
      第71回日本物理学会年次大会シンポジウム
    • Place of Presentation
      東北学院大学(宮城県仙台市)
    • Year and Date
      2016-03-21
    • Invited
  • [Presentation] Supersymmetry after the Higgs discovery2016

    • Author(s)
      伊部昌宏
    • Organizer
      New Generation Quantum Theory -Particle Physics, Cosmology, and Chemistry
    • Place of Presentation
      京都大学(京都府京都市)
    • Year and Date
      2016-03-09
    • Int'l Joint Research / Invited
  • [Presentation] CP- and Flavor-safe Minimal SUSY Model2016

    • Author(s)
      長井稔
    • Organizer
      KEK Theory Meeting on Particle Physics Phenomenology (KEK-PH2016)
    • Place of Presentation
      高エネルギー加速器研究機構(茨城県つくば市)
    • Year and Date
      2016-02-10
  • [Presentation] Interpretations of epsilon’_K/epsilon_K in the MSSM2016

    • Author(s)
      北原鉄平
    • Organizer
      KEK現象論研究会2016
    • Place of Presentation
      高エネルギー加速器研究機構(茨城県つくば市)
    • Year and Date
      2016-02-10
    • Invited
  • [Presentation] Nature of the elementary particles Messages from the LHC2015

    • Author(s)
      倉知昌史
    • Organizer
      Workshop for Unification and Development of the Neutrino Science Frontier (2015)
    • Place of Presentation
      ニューウェルシティ湯河原(静岡県熱海市)
    • Year and Date
      2015-12-01
    • Int'l Joint Research
  • [Presentation] Diboson Resonance as a Portal to Hidden Strong Dynamics2015

    • Author(s)
      伊部昌宏
    • Organizer
      Particle Cosmology and beyond 2015
    • Place of Presentation
      金沢アートホール(石川県金沢市)
    • Year and Date
      2015-11-19
    • Int'l Joint Research / Invited
  • [Presentation] Strong CP problem and axion on the lattice2015

    • Author(s)
      北野龍一郎
    • Organizer
      Particle Cosmology and beyond 2015
    • Place of Presentation
      金沢アートホール(石川県金沢市)
    • Year and Date
      2015-11-16
    • Int'l Joint Research / Invited
  • [Presentation] Flavor- and CP-safe minimal SUSY model2015

    • Author(s)
      長井稔
    • Organizer
      第5回日大理工・益川塾連携素粒子物理学シンポジウム
    • Place of Presentation
      日本大学(東京都千代田区)
    • Year and Date
      2015-10-24
  • [Presentation] Grand Picture2015

    • Author(s)
      北野龍一郎
    • Organizer
      International workshop on future potential of high intensity proton accelerator for particle and nuclear physics (HINT2015)
    • Place of Presentation
      J-PARC 東海村(茨城県東海村)
    • Year and Date
      2015-10-13
    • Int'l Joint Research / Invited
  • [Presentation] Collider signatures of one-family model of walking Technicolor2015

    • Author(s)
      倉知昌史
    • Organizer
      日本物理学会2015年秋季大会
    • Place of Presentation
      大阪市立大学(大阪府大阪市)
    • Year and Date
      2015-09-28
  • [Presentation] SU(3) gauge theory with four degenerate fundamental fermion on the lattice2015

    • Author(s)
      倉知昌史
    • Organizer
      日本物理学会2015年秋季大会
    • Place of Presentation
      大阪市立大学(大阪府大阪市)
    • Year and Date
      2015-09-25
  • [Presentation] τレプトン崩壊を通したレプトンフレーバーを破るヒッグス結合の研究2015

    • Author(s)
      森紳悟
    • Organizer
      日本物理学会2015年秋季大会
    • Place of Presentation
      大阪市立大学(大阪府大阪市)
    • Year and Date
      2015-09-08
  • [Presentation] Discussion on Strong CP Problem2015

    • Author(s)
      北野龍一郎
    • Organizer
      GGI workshop on "Gearing up for LHC13"
    • Place of Presentation
      フィレンツェ (イタリア)
    • Year and Date
      2015-09-08
    • Int'l Joint Research / Invited
  • [Presentation] Prospects for Spin-1 Resonance Search at 13TeV LHC and the ATLAS Diboson Excess2015

    • Author(s)
      北原鉄平
    • Organizer
      New Physics Forum
    • Place of Presentation
      東京大学宇宙線研究所(千葉県柏市)
    • Year and Date
      2015-08-19
    • Invited
  • [Presentation] Strong CP problem and axion on the lattice2015

    • Author(s)
      北野龍一郎
    • Organizer
      Joint KEK Theory Fermilab Theory Workshop
    • Place of Presentation
      シカゴ(アメリカ)
    • Year and Date
      2015-08-07
    • Int'l Joint Research
  • [Presentation] Phenomenology of singlet extended supersymmetric model - Dark matter, Baryogenesis2015

    • Author(s)
      北原鉄平
    • Organizer
      Joint KEK Theory Fermilab Theory Workshop
    • Place of Presentation
      シカゴ(アメリカ)
    • Year and Date
      2015-08-05
    • Int'l Joint Research
  • [Presentation] One-family model of walking Technicolor at the LHC2015

    • Author(s)
      倉知昌史
    • Organizer
      Joint KEK Theory Fermilab Theory Workshop
    • Place of Presentation
      シカゴ(アメリカ)
    • Year and Date
      2015-08-03
    • Int'l Joint Research
  • [Presentation] TeVスケールにおける電弱バリオジェネシスとILC2015

    • Author(s)
      北原鉄平
    • Organizer
      Summer camp on ILC accelerator and physics / detectors 2015
    • Place of Presentation
      伊香保ホテル天坊(群馬県渋川市)
    • Year and Date
      2015-07-18
  • [Presentation] Topology in QCD and the axion abundance2015

    • Author(s)
      北野龍一郎
    • Organizer
      MIAPP Workshop on "Anticipating 14TeV: Insights into Matter from the LHC and Beyond"
    • Place of Presentation
      ミュンヘン(ドイツ)
    • Year and Date
      2015-07-17
    • Int'l Joint Research / Invited
  • [Presentation] SU(3) gauge theory with four degenerate fundamental fermion on the lattice2015

    • Author(s)
      倉知昌史
    • Organizer
      The 30th International Symposium on Lattice Field Theory (Lattice2015)
    • Place of Presentation
      神戸国際会議場(兵庫県神戸市)
    • Year and Date
      2015-07-14
    • Int'l Joint Research
  • [Presentation] Reconstructing Supersymmetric Contribution to Muon Anomalous Magnetic Dipole Moment at ILC2015

    • Author(s)
      北原鉄平
    • Organizer
      Asian Linear Collider workshop 2015
    • Place of Presentation
      高エネルギー加速器研究機構(茨城県つくば市)
    • Year and Date
      2015-04-21
    • Int'l Joint Research
  • [Remarks] C03 ニュートリノで探る素粒子の起源と宇宙の構造

    • URL

      http://research.kek.jp/people/kitano/C03/

  • [Funded Workshop] Beyond the Standard Model in Okinawa 20162016

    • Place of Presentation
      沖縄科学技術大学院大学(沖縄県恩名村)
    • Year and Date
      2016-03-01 – 2016-03-08
  • [Funded Workshop] KEK Theory Meeting on Particle Physics Phenomenology (KEK-PH2016)2016

    • Place of Presentation
      高エネルギー加速器研究機構(茨城県つくば市)
    • Year and Date
      2016-02-09 – 2016-02-12
  • [Funded Workshop] Flavor Physics Workshop 20152015

    • Place of Presentation
      KKR沼津保養所「はまゆう」(静岡県沼津市)
    • Year and Date
      2015-10-06 – 2015-10-09
  • [Funded Workshop] Joint KEK Theory Fermilab Theory Workshop 20152015

    • Place of Presentation
      シカゴ(アメリカ)
    • Year and Date
      2015-08-03 – 2015-08-07

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Published: 2017-01-06   Modified: 2022-02-16  

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