Ryo Nagai

Profile Information

Affiliation: Senior researcher, Center for Exploratory Research, Research and Development Group, Hitachi, Ltd.,
: Keio University

Degree: .(Mar, 2012, Tohoku University)
.(Mar, 2014, Nagoya University, Nagoya University)
.(Mar, 2017, Nagoya University, Nagoya University)

Contact information: ryo.nagai.jdhitachi.com
J-GLOBAL ID: 201801009512825805
researchmap Member ID: B000316501

External link: https://inspirehep.net/authors/1322025

Research Interests

Research History

Sep, 2022 - Present

Keio University
Apr, 2022 - Present

Senior researcher, Center for Exploratory Research, Research and Development Group, Hitachi, Ltd.,
Apr, 2021 - Mar, 2022

Graduate School of Science, Osaka University
Nov, 2019 - Mar, 2021

University of Padova, INFN Padova
Dec, 2018 - Nov, 2019

ポスドク研究員, 東京大学宇宙線研究所理論グループ
Apr, 2017 - Dec, 2018

Tohoku University, Particle Theory and Cosmological Group
Apr, 2014 - Mar, 2017

日本学術振興会特別研究員(DC1), 理学研究科素粒子宇宙物理学専攻, 名古屋大学大学院

Education

Apr, 2014 - Mar, 2017

素粒子宇宙物理学専攻 (博士後期課程), 理学研究科, 名古屋大学大学院
Apr, 2012 - Mar, 2014

素粒子宇宙物理学専攻 (博士前期課程), 理学研究科, 名古屋大学大学院
Apr, 2008 - Mar, 2012

Tohoku University

Awards

Papers

Quantum channel decomposition with preselection and postselection

Ryo Nagai, Shu Kanno, Yuki Sato, Naoki Yamamoto

Phys.Rev.A, 108(2) 022615-022615, Aug 28, 2023 Peer-reviewed
Anapole moment of Majorana fermions and implications for direct detection of neutralino dark matter

Alejandro Ibarra, Merlin Reichard, Ryo Nagai

Journal of High Energy Physics, 2023(1), Jan 17, 2023 Peer-reviewed
Electroweak phase transition in the nearly aligned Higgs effective field theory

Shinya Kanemura, Ryo Nagai, Masanori Tanaka

Journal of High Energy Physics, 2022(6), Jun, 2022 Peer-reviewed
A new Higgs effective field theory and the new no-lose theorem

Shinya Kanemura, Ryo Nagai

Journal of High Energy Physics, 2022(3), Mar, 2022 Peer-reviewed
CP-Violation in a composite 2-Higgs doublet model

Stefania De Curtis, Stefano Moretti, Ryo Nagai, Kei Yagyu

Journal of High Energy Physics, 2021(10), Oct, 2021 Peer-reviewed
Scalar and fermion on-shell amplitudes in generalized Higgs effective field theory

Ryo Nagai, Masaharu Tanabashi, Koji Tsumura, Yoshiki Uchida

Physical Review D, 104(1), Jul 1, 2021 Peer-reviewed
Lepton flavor violations in SUSY models for muon g − 2 with right-handed neutrinos

Ryo Nagai, Norimi Yokozaki

Journal of High Energy Physics, 2021(1), Jan, 2021 Peer-reviewed
Direct detection of vector dark matter through electromagnetic multipoles

Junji Hisano, Alejandro Ibarra, Ryo Nagai

Journal of Cosmology and Astroparticle Physics, 2020(10) 015-015, Oct 6, 2020 Peer-reviewed
Oscillating composite asymmetric dark matter

Masahiro Ibe, Shin Kobayashi, Ryo Nagai, Wakutaka Nakano

Journal of High Energy Physics, 2020(1), Jan, 2020 Peer-reviewed
Symmetry and geometry in a generalized Higgs effective field theory: Finiteness of oblique corrections versus perturbative unitarity

Ryo Nagai, Masaharu Tanabashi, Koji Tsumura, Yoshiki Uchida

Physical Review D, 100(7), Oct, 2019 Peer-reviewed
Singlet Dirac fermion dark matter with mediators at loop

Junji Hisano, Ryo Nagai, Natsumi Nagata

Journal of High Energy Physics, 2018(12), Dec, 2018 Peer-reviewed
Heavy gravitino from dynamical generation of right-handed neutrino mass scale, and gravitational waves

Ryo Nagai, Fuminobu Takahashi, Norimi Yokozaki

Physics Letters B, 784 37-42, Sep, 2018 Peer-reviewed
Light Higgsino and gluino in R-invariant direct Gauge mediation

Ryo Nagai, Norimi Yokozaki

Physics Letters B, 778 309-315, Mar, 2018 Peer-reviewed
Model independent evaluation of the Wilson coefficient of the Weinberg operator in QCD

Tomohiro Abe, Junji Hisano, Ryo Nagai

Journal of High Energy Physics, 2018(3), Mar, 2018 Peer-reviewed
Classification of simple heavy vector triplet models

Tomohiro Abe, Ryo Nagai

Physical Review D, 95(7), Apr 14, 2017 Peer-reviewed
Unitarity sum rules, three-site moose model, and the ATLAS 2 TeV diboson anomalies

Tomohiro Abe, Ryo Nagai, Shohei Okawa, Masaharu Tanabashi

Physical Review D, 92(5), Sep 15, 2015 Peer-reviewed
Unitarity sum rules, three-site moose model, and the ATLAS 2 TeV diboson anomalies UNITARITY SUM RULES, THREE-SITE MOOSE MODEL, ⋯ ABE et al.

Tomohiro Abe, Ryo Nagai, Shohei Okawa, Masaharu Tanabashi

Physical Review D - Particles, Fields, Gravitation and Cosmology, 92(5), Sep 15, 2015 Peer-reviewed
Effective theories for dark matter nucleon scattering

Junji Hisano, Ryo Nagai, Natsumi Nagata

Journal of High Energy Physics, 2015(5), May, 2015 Peer-reviewed
Does unitarity imply finiteness of electroweak oblique corrections at one loop? Constraining extra neutral Higgs bosons

Ryo Nagai, Masaharu Tanabashi, Koji Tsumura

Physical Review D, 91(3), Feb 24, 2015 Peer-reviewed

Misc.

Quantum channel decomposition with pre- and post-selection

Ryo Nagai, Shu Kanno, Yuki Sato, Naoki Yamamoto

QS, 2023-QS-9(15) 1-7, Jun, 2023 Lead author
Tree level unitarity and finiteness of electroweak oblique corrections

Ryo Nagai

Apr 29, 2015
21aSD-6 Constraining extended electroweak symmetry breaking scenarios using the unitarity sum rules and the oblique parameters

Nagai Ryo, Tanabashi Masaharu, Tsumura Koji

Meeting abstracts of the Physical Society of Japan, 69(2) 13-13, Aug 22, 2014
30aSB-2 Constraining extended EWSB scenarios using the electroweak chiral Lagrangian with light Higgs bosons

Nagai Ryo, Tanabashi Masaharu, Tsumura Koji

Meeting abstracts of the Physical Society of Japan, 69(1) 18-18, Mar 5, 2014
Effects of charged scalar resonances on the unitarity of longitudinal electroweak gauge boson scattering amplitudes

Nagai Ryo, Tanabashi Masaharu, Tsumura Koji

Meeting abstracts of the Physical Society of Japan, 68(2) 13-13, Aug 26, 2013

Presentations

Quantum channel decomposition with pre- and post-selection

Joint symposium on quantum computing 2023, Aug 24, 2023 Invited
Quantum channel decomposition with pre- and post-selection

QS9, Jun 30, 2023
ノンカップリング効果を記述する新有効理論と新しい No-Lose 定理

長井遼

日本物理学会第77回年次大会 (2022年), Mar 15, 2022
標準模型からの拡張有効理論と摂動的ユニタリ性

長井遼

日本物理学会第77回年次大会 (2022年) 若手奨励賞受賞記念公講演, Mar 15, 2022 Invited
EFT analysis of EWPT

Ryo Nagai

The 32th New Higgs Working Group 2021年11月27日, Feb 19, 2022
A new Higgs EFT

Ryo Nagai

Seminar at KIAS, Feb 15, 2022 Invited
A new Higgs EFT and new no-lose theorem

Ryo Nagai

The 31th New Higgs Working Group, Nov 27, 2021
ヒッグス有効理論と摂動的ユニタリティ

長井遼

島根大学セミナー, Nov 19, 2021 Invited
ヒッグス結合定数による新物理探索

長井遼

素粒子現象論研究会2021
New No-Lose theorem for Higgs coupling measurements

ILC Workshop on Potential Experiments (ILCX2021)
Higgs physics (Review)

Summer camp on ILC accelerator, physics and detectors 2021, Sep 23, 2021 Invited
複合2HDMにおけるCPの破れ

長井遼

日本物理学会 2021年秋季大会, Sep 14, 2021
複合2HDMにおけるCPの破れ

長井遼

基研研究会素粒子物理学の進展 2021, Sep 10, 2021
DMとEFT

長井遼

EFT勉強会, Jul 2, 2021 Invited
Beyond HEFT

長井遼

新テラスケール勉強会, May 22, 2021
On-shell amplitudes in generalized Higgs EFT

長井遼

大阪大学素粒子・宇宙セミナー, Apr 12, 2021 Invited
Beyond HEFT

長井遼

The 29th New Higgs Working Group, Jan 23, 2021
ベクトル暗黒物質多極子の直接探索

長井遼

日本物理学会 2020年秋季大会, Sep 15, 2020
ベクトル暗黒物質多極子の直接探索

長井遼

基研研究会素粒子物理学の進展 2020, Sep 4, 2020
Direct detection of vector dark matter through electromagnetic multipoles

長井遼

IBS and KMI Joint Workshop 2020, Aug 26, 2020

Professional Memberships

Research Projects

強結合ヒッグス模型の精密検証に向けた理論研究

科学研究費助成事業特別研究員奨励費, 特別研究員奨励費, 日本学術振興会, Apr, 2021 - Mar, 2024

長井遼
ヒッグス場有効理論を用いた新物理の探索

科学研究費助成事業, 新学術領域研究(研究領域提案型), 日本学術振興会, Apr, 2019 - Mar, 2021

長井遼
ヒッグス場有効理論を用いた新物理の探索

科学研究費助成事業若手研究, 若手研究, 日本学術振興会, Apr, 2019 - Mar, 2020

長井遼
軽いスカラー粒子を含む電弱カイラル有効理論による新物理の探索

科学研究費助成事業特別研究員奨励費, 特別研究員奨励費, 日本学術振興会, Apr, 2014 - Mar, 2017

長井遼

Profile Information

Research Interests

Research History

Education

Awards

Papers

Misc.

Presentations

Professional Memberships

Research Projects

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