野尻 美保子

J-GLOBALへ         更新日: 19/07/10 11:22
 
アバター
研究者氏名
野尻 美保子
 
ノジリ ミホコ
URL
http://research.kek.jp/people/nojiri
所属
素粒子原子核研究所
部署
高エネルギー加速器研究機構素粒子原子核研究機構
職名
教授
その他の所属
東京大学カブリ数物連携宇宙研究機構
科研費研究者番号
30222201
Twitter ID
mihoko_nojiri

プロフィール

素粒子論 主にコライダー実験や暗黒物質の物理を研究

研究キーワード

 
 

研究分野

 
 

経歴

 
2007年10月
 - 
現在
東京大学 数物連携宇宙研究機構 主任研究員
 
2006年
 - 
現在
 高エネルギー加速器研究機構教授
 
2006年1月
 - 
2007年3月
高エネルギー加速器研究機構素粒子原子核研究所 素粒子原子核研究所 准教授
 
1997年
 - 
2004年12月
京都大学基礎物理学研究所助教授
 
1993年7月
   
 
-1997 高エネルギ物理学研究所助手
 

学歴

 
 
 - 
1990年
京都大学 理学研究科 物理学第二
 
 
 - 
1985年
京都大学 理学部 
 

委員歴

 
2017年10月
 - 
現在
日本学術会議  会員
 
2015年4月
 - 
現在
日本物理学会  男女共同参画委員会委員
 
2007年10月
 - 
現在
東京大学カブリ数物連携宇宙研究機構 主任研究員
 
2017年4月
 - 
2019年3月
日本物理学会  理事
 
2009年7月
 - 
2011年7月
内閣府総合科学技術会議基本政策専門調査会委員 
 
2009年4月
 - 
2010年3月
東京大学  宇宙線研究所運営委員会委員
 

Misc

 
Amit Chakraborty, Sung Hak Lim, Mihoko M. Nojiri
   2019年4月
Classification of jets with deep learning has gained significant attention in
recent times. However, the performance of deep neural networks is often
achieved at the cost of interpretability. Here we propose an interpretable
network trained on the...
Amit Chakraborty, Motoi Endo, Benjamin Fuks, Björn Herrmann, Mihoko M. Nojiri, Priscilla Pani, Giacomo Polesello
Eur. Phys. J. C78 (2018) 844      2018年8月
We explore signatures related to squark decays in the framework of
non-minimally flavour-violating Supersymmetry. We consider a simplified model
where the lightest squark consists of an admixture of charm and top flavour. By
recasting the existing...
Sung Hak Lim, Mihoko M. Nojiri
JHEP10(2018)181      2018年7月
Jets from boosted heavy particles have a typical angular scale which can be
used to distinguish them from QCD jets. We introduce a machine learning
strategy for jet substructure analysis using a spectral function on the angular
scale. The angular ...
Amit Chakraborty, Silvan Kuttimalai, Sung Hak Lim, Mihoko M. Nojiri, Richard Ruiz
Eur. Phys. J. C (2018) 78: 679      2018年5月
In models with colored particle Tex that can decay into a dark
matter candidate Tex, the relevant collider process Texjets gives rise to events
with significant transverse momentum im...
Keisuke Fujii, Christophe Grojean, Michael E. Peskin, Tim Barklow, Yuanning Gao, Shinya Kanemura, Hyungdo Kim, Jenny List, Mihoko Nojiri, Maxim Perelstein, Roman Pöschl, Jürgen Reuter, Frank Simon, Tomohiko Tanabe, James D. Wells, Jaehoon Yu, Mikael Berggren, Moritz Habermehl, Robert Karl, Gudrid Moortgat-Pick, Sabine Riemann, Junping Tian, Graham W. Wilson, James Brau, Hitoshi Murayama
   2018年1月
The International Linear Collider is now proposed with a staged machine
design, with the first stage at Tex~250 GeV and an integrated
luminosity goal of 2~abTex. One of the questions for the machine design is
the importance of positron...
Keisuke Fujii, Christophe Grojean, Michael E. Peskin, Tim Barklow, Yuanning Gao, Shinya Kanemura, Hyungdo Kim, Jenny List, Mihoko Nojiri, Maxim Perelstein, Roman Poeschl, Juergen Reuter, Frank Simon, Tomohiko Tanabe, James D. Wells, Jaehoon Yu, Mikael Berggren, Moritz Habermehl, Sunghoon Jung, Robert Karl, Tomohisa Ogawa, Junping Tian, James Brau, Hitoshi Murayama
   2017年10月
The International Linear Collider is now proposed with a staged machine
design, with the first stage at 250 GeV with a luminosity goal of 2 ab-1. In
this paper, we review the physics expectations for this machine. These include
precision measureme...
Keisuke Fujii, Christophe Grojean, Michael E. Peskin, Tim Barklow, Yuanning Gao, Shinya Kanemura, Hyungdo Kim, Jenny List, Mihoko Nojiri, Maxim Perelstein, Roman Pöschl, Jürgen Reuter, Frank Simon, Tomohiko Tanabe, James D. Wells, Jaehoon Yu, Howard Baer, Mikael Berggren, Sven Heinemeyer, Suvi-Leena Lehtinen, Junping Tian, Graham Wilson, Jacqueline Yan, Hitoshi Murayama, James Brau
   2017年2月
This paper addresses the question of whether the International Linear
Collider has the capability of discovering new particles that have not already
been discovered at the CERN Large Hadron Collider. We summarize the various
paths to discovery off...
Keisuke Fujii, Christophe Grojean, Michael E. Peskin, Tim Barklow, Yuanning Gao, Shinya Kanemura, Hyungdo Kim, Jenny List, Mihoko Nojiri, Maxim Perelstein, Roman Poeschl, Juergen Reuter, Frank Simon, Tomohiko Tanabe, Jaehoon Yu, James D. Wells, Adam Falkowski, Shigeki Matsumoto, Takeo Moroi, Francois Richard, Junping Tian, Marcel Vos, Hiroshi Yokoya, Hitoshi Murayama, Hitoshi Yamamoto
   2016年7月
If the gamma-gamma resonance at 750 GeV suggested by 2015 LHC data turns out
to be a real effect, what are the implications for the physics case and upgrade
path of the International Linear Collider? Whether or not the resonance is
confirmed, this...
Keisuke Fujii, Christophe Grojean, Michael E. Peskin, Tim Barklow, Yuanning Gao, Shinya Kanemura, Hyungdo Kim, Jenny List, Mihoko Nojiri, Maxim Perelstein, Roman Poeschl, Juergen Reuter, Frank Simon, Tomohiko Tanabe, Jaehoon Yu, James D. Wells, Hitoshi Murayama, Hitoshi Yamamoto
   2015年6月
We summarize the physics case for the International Linear Collider (ILC). We
review the key motivations for the ILC presented in the literature, updating
the projected measurement uncertainties for the ILC experiments in accord with
the expected ...
Howard Baer, Mikael Berggren, Jenny List, Mihoko M. Nojiri, Maxim Perelstein, Aaron Pierce, Werner Porod, Tomohiko Tanabe
   2013年7月
The International Linear Collider (ILC) has recently proven its technical
maturity with the publication of a Technical Design Report, and there is a
strong interest in Japan to host such a machine. We summarize key aspects of
the Beyond the Standa...
Chengcheng Han, Mihoko M. Nojiri, Michihisa Takeuchi, Tsutomu T. Yanagida
   2016年9月
Recently ATLAS reported a Tex excess in the stop search with
Tex channel. We try to interpret the signal by a light stop
pair production in the MSSM. We find: (1) simple models where stop decays into
a higgsino or a bino...
Biplob Bhattacherjee, Satyanarayan Mukhopadhyay, Mihoko M. Nojiri, Yasuhito Sakaki, Bryan R. Webber
   2016年9月
We study the impact of including quark- and gluon-initiated jet
discrimination in the search for strongly interacting supersymmetric particles
at the LHC. Taking the example of gluino pair production, considerable
improvement is observed in the LH...
Chengcheng Han, Koji Ichikawa, Shigeki Matsumoto, Mihoko M. Nojiri, Michihisa Takeuchi
   2016年2月
A colored heavy particle with sufficiently small width may form
non-relativistic bound states when they are produced at the large hadron
collider\,(LHC), and they can annihilate into a diphoton final state. The
invariant mass of the diphoton would...
Keisuke Harigaya, Takafumi Igari, Mihoko M. Nojiri, Michihisa Takeuchi, Kazuhiro Tobe
JHEP 03(2014) 105      2014年3月   [査読有り]
In this paper, we consider phenomenology of a model with an Tex
gauge symmetry. Since the muon couples to the Tex gauge boson
(called Tex boson), its contribution to the muon anomalous magnetic moment
(muon g-2) can account...
Motoi Endo, Takeo Moroi, Mihoko M. Nojiri, Yutaro Shoji
   2017年4月
The decay rate of a false vacuum is studied in gauge theory, paying
particular attention to its gauge invariance. Although the decay rate should
not depend on the gauge parameter Tex according to the Nielsen identity, the
gauge invariance of the...
Motoi Endo, Takeo Moroi, Mihoko M. Nojiri, Yutaro Shoji
   2017年3月
We study the gauge invariance of the decay rate of the false vacuum for the
model in which the scalar field responsible for the false vacuum decay has
gauge quantum number. In order to calculate the decay rate, one should
integrate out the field f...
Hajime Fukuda, Masahiro Ibe, Osamu Jinnouchi, Mihoko Nojiri
   2016年7月
Among various models to explain the Tex GeV diphoton resonance hinted at
the LHC Run 2, a class of models where the resonance decays not into a pair of
photons but into a pair of photon-jets is gathering definite attention. In this
paper, we stu...
Daniele Alves, Nima Arkani-Hamed, Sanjay Arora, Yang Bai, Matthew Baumgart, Joshua Berger, Matthew Buckley, Bart Butler, Spencer Chang, Hsin-Chia Cheng, Clifford Cheung, R. Sekhar Chivukula, Won Sang Cho, Randy Cotta, Mariarosaria D'Alfonso, Sonia El Hedri, Rouven Essig, Jared A. Evans, Liam Fitzpatrick, Patrick Fox, Roberto Franceschini, Ayres Freitas, James S. Gainer, Yuri Gershtein, Richard Gray, Thomas Gregoire, Ben Gripaios, Jack Gunion, Tao Han, Andy Haas, Per Hansson, JoAnne Hewett, Dmitry Hits, Jay Hubisz, Eder Izaguirre, Jared Kaplan, Emanuel Katz, Can Kilic, Hyung-Do Kim, Ryuichiro Kitano, Sue Ann Koay, Pyungwon Ko, David Krohn, Eric Kuflik, Ian Lewis, Mariangela Lisanti, Tao Liu, Zhen Liu, Ran Lu, Markus Luty, Patrick Meade, David Morrissey, Stephen Mrenna, Mihoko Nojiri, Takemichi Okui, Sanjay Padhi, Michele Papucci, Michael Park, Myeonghun Park, Maxim Perelstein, Michael Peskin, Daniel Phalen, Keith Rehermann, Vikram Rentala, Tuhin Roy, Joshua T. Ruderman, Veronica Sanz, Martin Schmaltz, Stephen Schnetzer, Philip Schuster, Pedro Schwaller, Matthew D. Schwartz, Ariel Schwartzman, Jing Shao, Jessie Shelton, David Shih, Jing Shu, Daniel Silverstein, Elizabeth Simmons, Sunil Somalwar, Michael Spannowsky, Christian Spethmann, Matthew Strassler, Shufang Su, Tim Tait, Brooks Thomas, Scott Thomas, Natalia Toro, Tomer Volansky, Jay Wacker, Wolfgang Waltenberger, Itay Yavin, Felix Yu, Yue Zhao, Kathryn Zurek
2012 J. Phys. G: Nucl. Part. Phys. 39 105005      2011年5月
This document proposes a collection of simplified models relevant to the
design of new-physics searches at the LHC and the characterization of their
results. Both ATLAS and CMS have already presented some results in terms of
simplified models, and...
Biplob Bhattacherjee, Satyanarayan Mukhopadhyay, Mihoko M. Nojiri, Yasuhito Sakaki, Bryan R. Webber
   2015年1月
We show that in studies of light quark- and gluon-initiated jet
discrimination, it is important to include the information on softer
reconstructed jets (associated jets) around a primary hard jet. This is
particularly relevant while adopting a sma...
Biplob Bhattacherjee, Debajyoti Choudhury, Keisuke Harigaya, Shigeki Matsumoto, Mihoko M. Nojiri
JHEP 1304 (2013) 031      2012年12月   [査読有り]
Present and future expected limits on interactions between dark matter and
various quarks are thoroughly investigated in a model-independent way. In
particular, the constraints on the interactions from the Large Hadron Collider
(LHC) experiment ar...
Chengcheng Han, Mihoko M. Nojiri, Myeonghun Park
   2015年12月
Perturbative unitarity conditions have been playing an important role by
estimating the energy scale of new physics, including the Higgs mass as one of
the most important examples. In this letter, we show that there is a
possibility to see the hin...
Motoi Endo, Takeo Moroi, Mihoko M. Nojiri, Yutaro Shoji
   2015年11月
We study radiative corrections to the decay rate of false vacua, paying
particular attention to the renormalization-scale dependence of the decay rate.
The decay rate exponentially depends on the bounce action. The bounce action
itself is renormal...
Tomohiro Abe, Teppei Kitahara, Mihoko M. Nojiri
JHEP 1602 (2016) 084      2015年7月
Motivated by ATLAS diboson excess around 2 TeV, we investigate a
phenomenology of spin-1 resonances in a model where electroweak sector in the
SM is weakly coupled to strong dynamics. The spin-1 resonances, W' and Z', are
introduced as effective d...
Hiroki Matsui, Mihoko Nojiri
Phys. Rev. D 92, 025045 (2015)      2015年3月
The neutrino minimal Standard Model ({\nu}MSM) is the minimum extension of
the standard model. In this model, the Dodelson-Widrow mechanism (DW) produces
keV sterile neutrino dark matter (DM) and the degenerate GeV heavy Majorana
neutrinos lead to...
Satyanarayan Mukhopadhyay, Mihoko M. Nojiri, Tsutomu T. Yanagida
JHEP10(2014)012      2014年3月
The LHC search for nearly degenerate gluinos and neutralinos, which can
occur, for example, in SUSY axion models, is limited by the reduced missing
transverse momentum and effective mass in the events. We propose the use of
kinematic correlations ...
Masato Yamanaka, Kazunori Kohri, Kunihito Ioka, Mihoko M. Nojiri
Phys. Rev. D. 91 no. 6, 063532 (2015)      2013年10月
We apply the axion-photon conversion mechanism to the 130 GeV Tex-ray
line observed by the Fermi satellite. Near the Galactic center, some
astrophysical sources and/or particle dark matter can produce energetic axions
(or axionlike particles)...
Biplob Bhattacherjee, Shigeki Matsumoto, Satyanarayan Mukhopadhyay, Mihoko M. Nojiri
JHEP10(2013)032      2013年6月   [査読有り]
Asymmetric dark matter (ADM) has been an attractive possibility attempting to
explain the observed ratio of baryon to dark matter abundance in the universe.
While a bosonic ADM is constrained by the limits from existence of old neutron
stars, a fe...
Motoi Endo, Takeo Moroi, Mihoko M. Nojiri
   2015年2月
Motivated by future collider proposals that aim to measure the Higgs
properties precisely, we study the partial decay widths of the lightest Higgs
boson in the minimal supersymmetric standard model with an emphasis on the
parameter region where al...
Sourav K. Mandal, Mihoko Nojiri, Matthew Sudano, Tsutomu T. Yanagida, .
JHEP   1101(131)    2011年
The hierarchy of the Yukawa couplings is an outstanding problem of the
standard model. We present a class of models in which the first and second
generation fermions are SUSY partners of pseudo-Nambu-Goldstone bosons that
parameterize a non-compac...
Mihoko M. Nojiri
CERN Yellow Report CERN-2014-001, pp.137-149      2014年6月
A Brief review on the physics beyond the Standard Model.
Hirohisa Kubota, Mihoko Nojiri
Phys. Rev. D 90, 035006 (2014)      2014年4月
In a class of Randall-Sundrum(RS) models, matter fermions and gauge bosons
live in a five dimensional bulk, while the Higgs boson lives in a four
dimensional visible brane. The Higgs boson can mix with a radion, by a
Higgs-radion mixing term. It i...
Kaoru Hagiwara, Mihoko M. Nojiri, Yasuhito Sakaki
Phys. Rev. D 89, 094009 (2014)      2014年3月
Present experimental datas have shown a 3.8Tex level discrepancy with
the standard model in Tex. Some new
physics models have been considered to explain this discrepancy possibly with
new source of th...
Ben Gripaios, Keiko Nagao, Mihoko Nojiri, Kazuki Sakurai, Bryan Webber
JHEP 03(2013)106      2012年10月   [査読有り]
We propose a method for reconstructing the mass of a particle, such as the
Higgs boson, decaying into a pair of tau leptons, of which one subsequently
undergoes a 3-prong decay. The kinematics is solved using information from the
visible decay pro...
Keisuke Harigaya, Shigeki Matsumoto, Mihoko M. Nojiri, Kohsaku Tobioka
   2012年4月
Vector-like quarks are introduced in various new physics models beyond the
standard model (SM) at the TeV scale. We especially consider the case that the
quark is singlet (triplet) under the SU(2)Tex (SU(3)Tex) gauge group and
couples only to th...
Biplob Bhattacherjee, Sourav K. Mandal, Mihoko Nojiri
JHEP 1303 (2013) 105      2012年11月   [査読有り]
Top polarization is an important probe of new physics that couples to the top
sector, and which may be discovered at the 14 TeV LHC. Taking the example of
the MSSM, we argue that top polarization measurements can put a constraint on
the soft super...
野尻 美保子
パリティ   27(12) 17-21   2012年12月
Sung-Gi Kim, Nobuhiro Maekawa, Keiko I. Nagao, Mihoko M. Nojiri, Kazuki Sakurai
JHEP 0910:005,2009   0910(005)    2009年7月
We study the LHC signature of the minimal supersymmetric standard model with
non-universal sfermion masses. In the model, soft masses of gauginos and the
3rd generation of 10 of SU(5) are around the weak scale, while other sfermion
soft mass is un...
Keisuke Harigaya, Shigeki Matsumoto, Mihoko M. Nojiri, Kohsaku Tobioka
   2011年9月
In the framework of the little higgs scenario, coupling constants of several
interactions are related to each other to guarantee the stability of the higgs
boson mass at one-loop level. This relation is called the little higgs
mechanism. We discus...
Subhaditya Bhattacharya, Sanjoy Biswas, Biswarup Mukhopadhyaya, Mihoko M. Nojiri
   2011年5月
We discuss large non-universality in the Higgs sector at high scale in
supersymmetric theories, in the context of the Large Hadron Collider (LHC). In
particular, we note that if Tex is large and negative
($\simeq 10^6 {\rm ~G...
Hirohisa Kubota, Mihoko Nojiri
Phys.Rev. D87 (2013) 076011      2012年7月   [査読有り]
In this paper we study the higgs-radion system of the Randall-Sundum model
where matter and gauge fields live in the bulk. We take into account the
Kalza-Klein(KK) loop correction for the higgs and the raidion coupling to the
gauge bosons. Inspire...
Chuan-Ren Chen, Mihoko M. Nojiri, Seong Chan Park, Jing Shu, Michihisa Takeuchi
JHEP 0909:078,2009   0909(078)    2009年3月
We explicitly show that split-universal extra dimension (split-UED), a
recently suggested extension of universal extra dimension (UED) model, can
nicely explain recent anomalies in cosmic-ray positrons and electrons observed
by PAMELA and ATIC/PPB...
Chuan-Ren Chen, Mihoko M. Nojiri, Seong Chan Park, Jing Shu
   2009年8月
Kaluza-Klein photon in universal extra dimension models is one of the most
attractive dark matter candidates as a weakly interacting massive particle.
Having a characteristic split spectrum in split universal extra dimension the
relic density of K...
Keisuke Harigaya, Shigeki Matsumoto, Mihoko M. Nojiri, Kohsaku Tobioka
JHEP 1201 (2012) 135      2011年9月   [査読有り]
In the framework of the little higgs scenario, coupling constants of several
interactions are related to each other to guarantee the stability of the higgs
boson mass at one-loop level. This relation is called the little higgs
mechanism. We discus...
Won Sang Cho, William Klemm, Mihoko M. Nojiri
Phys.Rev.D84:035018,2011      2010年8月
We report a new possibility of using the Tex (Constransverse mass)
variable for mass measurement in single step decay chains involving missing
particles with moderate transverse momentum. We show that its experimental
feasibility is enhanced c...
Hitoshi Murayama, Mihoko M. Nojiri, Kohsaku Tobioka
PhysRevD.84:094015,2011      2011年7月   [査読有り]
We study the discovery potential of the Minimal Universal Extra Dimension
model (MUED) and improve it utilizing the multijet + lepton mode at the LHC.
Since the MUED has a nearly degenerate spectrum, most events only have soft
jets and small Emiss...
Mihoko M. Nojiri, Kazuki Sakurai, Bryan R. Webber
JHEP 1006:069,2010   1006(069)    2010年5月
A method is proposed for determining the masses of the new particles N,X,Y,Z
in collider events containing a pair of effectively identical decay chains Z to
Y+jet, Y to X+l_1, X to N+l_2, where l_1, l_2 are opposite-sign same-flavour
charged lepto...
Chuan-Ren Chen, Koichi Hamaguchi, Mihoko M. Nojiri, Fuminobu Takahashi, Shoji Torii,
JCAP   0905(015) 1   2009年
We argue that we may be able to sort out dark matter models in which
electrons are generated through the annihilation and/or decay of dark matter,
by using a fact that the initial energy spectrum is reflected in the cosmic-ray
electron flux observ...
岩住 俊明, 延與 秀人, 筑本 知子, 千崎 文峰, 野尻 美保子, 河内 明子
日本物理學會誌   66(5) 380-385   2011年5月
Chuan-Ren Chen, Mihoko M. Nojiri, Warintorn Sreethawong
JHEP   1011(012)    2010年6月
We consider the production of a light non-standard model Higgs boson of order
Tex with an associated Tex boson at CERN Large Hadron Collider. We focus
on an interesting scenario that, the Higgs boson decays predominately into two
light scal...
Mihoko M. Nojiri, Jing Shu
JHEP 1106:047,2011      2011年1月
We consider the spin determination of new colored particles in the missing
energy plus jets channel at the early stage of LHC. We use a three site moose
model to describe the low energy Lagrangian of all same spin partner (LHT or
UED like) models ...
Johan Alwall, Kenji Hiramatsu, Mihoko M. Nojiri, Yasuhiro Shimizu
Phys.Rev.Lett.103:151802,2009   103(151802)    2009年5月
At hadron colliders, the production of heavy new particles is associated with
additional quarks and gluons with significant transeverse momentum. The
additional jets complicates the reconstruction of new particle masses. Taking
gluino pair product...
Chuan-Ren Chen, Mihoko M. Nojiri, Fuminobu Takahashi, T. T. Yanagida
Prog.Theor.Phys.122:553-559,2009      2008年11月
We show that the PAMELA anomaly in the positron fraction as well as the
ATIC/PPB-BETS excesses in the e^- + e^+ flux are simultaneously explained in
our scenario that a hidden U(1)H gauge boson constitutes dark matter of the
Universe and decays in...
Mihoko M. Nojiri, Kazuki Sakurai
Physical Review   82(11) 115026   2010年8月
Use of inclusive MT2 distribution for sparticle mass determination is
discussed. We define new parameters MT2(min) and MT2mod(min), which are a kind
of minimum of sub-systerm MT2 values. Their endpoints are less affected by
initial state radiation...
Norita Kawanaka, Kunihito Ioka, Mihoko M. Nojiri
Astrophys.J.710:958-963,2010   710(2,Pt.1) 958-963   2009年3月
We investigate the observed spectrum of cosmic-ray electrons and positrons
from astrophysical sources, especially pulsars, and the physical processes for
making the spectrum spiky or smooth via continuous and multiple
electron/positron injections....
Mihoko M. Nojiri, Kazuki Sakurai, Yasuhiro Shimizu, Michihisa Takeuchi
JHEP0810:100,2008      2008年8月
The ATLAS and CMS experiments at the Large Hadron Collider (LHC) may discover
the squarks (\tilde{q}) and gluino (\tilde{g}) of the minimal supersymmetric
standard model (MSSM) in the early stage of the experiments if their masses are
lighter than...
Mihoko M. Nojiri, Yasuhiro Shimizu, Shogo Okada, Kiyotomo Kawagoe
JHEP0806:035,2008      2008年2月
We propose an inclusive analysis of a stransverse mass (m_{T2}) using a
hemisphere method for supersymmetry studies at the LHC . The hemisphere method
is an algorithm to group collinear and high p_T particles and jets, assuming
that there are two ...
Junji Hisano, Mihoko M. Nojiri, Warintorn Sreethawong
JHEP 0906:044,2009   0906(044) 1   2008年12月
Current limit on the dark matter relic abundance may suggest that Tex
should be smaller than prediction in the minimal supergravity scenario (mSUGRA)
for moderate Tex and Tex. The electroweak-ino parameter Tex and
Tex are th...
Mihoko M. Nojiri
AIP Conf.Proc.1078:79-83,2009      2008年9月
I review recent developments on the use of mT2 variables for SUSY parameter
study, which might be useful for the data analysis in the early stage of the
LHC experiments. I also review some of recent interesting studies. Talk in
SUSY08.
Yukihiro Kato, Keisuke Fujii, Teruki Kamon, Vadim Khotilovich, Mihoko M. Nojiri
Phys.Lett. B611 (2005) 223-230   B611, 223-230    2004年11月
The lighter chargino pair production (Tex) is one of key processes for determination of
supersymmetric parameters at a linear collider. If Tex is a large
value, the lighter stau ($\tilde{\...
Mihoko M. Nojiri, Michihisa Takeuchi
JHEP0810:025,2008      2008年2月
In the Littlest Higgs model with T-parity (LHT), top-partners (T_-) are
produced in pairs at the Large Hadron Collider (LHC). Each top-partner decays
into a top quark (t) and the lightest T-odd gauge partner A_H. We demonstrate
reconstruction of t...
Mihoko M. Nojiri, Giacomo Polesello, Daniel R. Tovey
Journal for High Energy Physics   0805(014)    2008年
Koichi Hamaguchi, Mihoko M. Nojiri, Albert de Roeck
JHEP 0703:046,2007      2006年12月
If the scalar tau Tex is the next lightest supersymmetric particle and
decays into a gravitino (Tex) being the lightest supersymmetric
particle, it will have generally a very long lifetime. In this paper, we
investigate the possibilit...
野尻 美保子
日本物理學會誌   62(12) 929-935   2007年12月
宇宙の物質の大半を占める暗黒物質は,電荷をもたない,極あて相互作用の弱い素粒子であると考えられている.一方,素粒子標準模型は暗黒物質候補を含まないので,暗黒物質を矛盾なく説明できるように,見直される必要がある.暗黒物質は初期宇宙では素粒子の高エネルギー粒子衝突たよって生成されたと考えられるが,現在2008年から開始されるLHC実験ではまさにこのような高エネルギー衝突実験を行い暗黒物質の性質を明らかにしようとしている.本稿では暗黒物質研究とLHC実験の関係について解説する.
Mihoko M. Nojiri, Michihisa Takeuchi
Phys.Rev.D76:015009,2007      2007年1月
Tex production is one of the main SUSY production
processes in the MSSM, which occurs due to the chirality flip caused by the
Majorana gluino mass. This process is one of the sources of same sign two
lepton (SS2Tex) events, h...
Shigeki Matsumoto, Mihoko M. Nojiri, Daisuke Nomura
Phys.Rev.D75:055006,2007      2006年12月
We study the Littlest Higgs model with T-parity at the LHC through pair
productions of the T-odd top quark partner (T_-) which decays into the top
quark and the lightest T-odd particle. We identify the region of parameters
favored by the electrowe...
Junji Hisano, Minoru Nagai, Mihoko M. Nojiri, Masato Senami
Phys.Rev. D73 (2006) 031701      2005年4月
We investigate a possibility of neutralino dark matter (DM) direct detection
in the future electron accelerators. That is counting of high p_T electron
recoil events by neutralinos in halo. If selectron and neutralino masses would
be precisely mea...
Kiyotomo Kawagoe, Mihoko M. Nojiri
Phys.Rev. D74 (2006) 115011      2006年6月
Discovery of supersymmetric (SUSY) particles at the Large Hadron
Collider(LHC) has been studied for the models where squarks and gluino are much
heavier than the lightest supersymetric particle (LSP). In this paper, we
investigate the SUSY discove...
M. M. Nojiri, G Polesello , D.R. Tovey
Journal of High Energy Physics   0603(063)    2006年
Junji Hisano, Shigeki. Matsumoto, Mihoko M. Nojiri, Osamu Saito
Phys.Rev. D71 (2005) 063528      2004年12月
Detection of gamma rays from dark matter annihilation in the galactic center
is one of the feasible techniques to search for dark matter. We evaluate the
gamma ray flux in the case that the dark matter has an electroweak SU(2)_L
charge. Such dark ...
Hinchliffe Ian, Battaglia Marco, 野尻 美保子
パリティ   20(9) 6-15   2005年9月
Physical Review   D71:035008    2005年
Junji Hisano, Shigeki Matsumoto, Mihoko M. Nojiri, Osamu Saito
Phys.Rev. D71 (2005) 015007   D71: 015007    2004年7月
The neutralino-nucleon (\tilde{\chi}^0-N) scattering is an important process
for direct dark matter searches. In this paper we discuss one-loop
contributions to the cross section in the wino-like and Higgsino-like LSP
cases. The neutralino-nucleon...
Koichi Hamaguchi, Yoshitaka Kuno, Tsuyoshi Nakaya, Mihoko M. Nojiri
Phys.Rev.D70:115007,2004   D70: 115007    2004年9月
In models where the gravitino is the lightest supersymmetric particle (LSP),
the next-to-lightest supersymmetric particle (NLSP) is long-lived. We consider
an important charged NLSP candidate, the scalar tau Tex. Slow
charged NLSPs may ...
Mihoko M. Nojiri
   2004年11月
At the LHC, superpartners with the masses lighter than a few TeV may be
found, and the masses of the supersymmetric (SUSY) particles and their
interactions will be studied. The information would be the base to consider the
SUSY breaking mechanism ...
Junji Hisano, Kiyotomo Kawagoe, Ryuichiro Kitano, Mihoko M. Nojiri
Phys.Rev. D66 (2002) 115004   D66:115004    2002年4月
In the minimal supersymmetric standard model (MSSM) properties of the third
generation sfermions are important from the viewpoint of discriminating the
SUSY breaking models and in the determination of the Higgs boson mass. If
gluinos are copiously...
Kiyotomo Kawagoe, Tomio Kobayashi, Mihoko M. Nojiri, Atsuhiko Ochi
Phys.Rev. D69 (2004) 035003   D69:035003    2003年9月
In this paper we study the gauge mediation signal with the ATLAS detector at
the CERN LHC. We focus on the case where the NLSP is the long-lived lightest
neutralino (Tex) which decays dominantly into a photon
(Tex) and a gravit...
SUSY PARAMETER DETERMINATION IN COMBINED ANALYSES AT LHC / LC.
Journal of High Energy Physics   0402:035    2004年
STUDY OF THE SLEPTON NON-UNIVERSALITY AT THE CERN LARGE HADRON COLLIDER.
Physical Review   D70:075016    2004年
野尻 美保子
日本物理学会講演概要集   58(2-1)    2003年8月
Junji Hisano, Shigeki Matsumoto, Mihoko M. Nojiri
Phys.Rev.Lett.92:031303,2004      2003年7月
If the Dark Matter (DM) in the Universe has interactions with the
standard-model particle, the pair annihilation may give the imprints in the
cosmic ray. In this paper we study the pair annihilation processes of the DM,
which is neutral, however h...
Manuel Drees, Yeong Gyun Kim, Tatsuo Kobayashi, Mihoko M. Nojiri
Phys.Rev.D63:115009,2001   (D63) 115009   2000年11月
We compare predictions for the spin-independent contribution to the
neutralino-proton scattering cross section Tex and for the anomalous
magnetic dipole moment of the muon, Tex, in models with
gravity-mediated supersymmetry br...
Mihoko M. Nojiri
Pramana 62:659-662,2004      2003年5月
In supersymmetric models a gluino can decay into Tex
through a stop or a sbottom. The decay chain produces an edge structure in the
Tex distribution. Monte Carlo simulation studies show that the end point
and the edge hei...
Manuel Drees, Yeong Gyun Kim, Mihoko M. Nojiri, Daisuke Toya, Kazumi Hasuko, Tomio Kobayashi
Phys.Rev.D63:035008,2001      2000年7月
We show that LHC experiments might well be able to determine all the
parameters required for a prediction of the present density of thermal LSP
relics from the Big Bang era. If the LSP is an almost pure bino we usually only
need to determine its m...
Mihoko M. Nojiri
Pramana62:335-346,2004      2003年5月
A short tour of supersymmetric dark matter and its connection to collider
physics.
Junji Hisano, Kiyotomo Kawagoe, Mihoko M. Nojiri
Phys.Rev.D68:035007,2003   D68:035007    2003年4月
In supersymmetric models a gluino can decay into tb\tilde{\chi}^{\pm}_1
through a stop or a sbottom. The decay chain produces an edge structure in the
m_{tb} distribution. Monte Carlo simulation studies show that the end point and
the edge height ...
Junji Hisano, Sh. Matsumoto, Mihoko M. Nojiri
Phys.Rev. D67 (2003) 075014   D67:075014    2002年12月
The neutralino pair annihilation into two photons in our galactic halo gives
a robust dark matter signal, since it would give a quasi-monotonic gamma ray.
This process is radiatively-induced, and the full-one loop calculation was done
previously. ...
Jonathan L. Feng, Mihoko M. Nojiri
   2002年10月
We present a pedagogical introduction to supersymmetry and supersymmetric
models and give an overview of the potential of the linear collider for
studying them. If supersymmetry is found, its discovery will bring with it many
more questions than a...
Junji Hisano, Ryuichiro Kitano, Mihoko M. Nojiri
Phys.Rev.D65:116002,2002   D65:116002    2002年2月
Measurement of Lepton-Flavor Violation (LFV) in the minimal SUSY Standard
Model (MSSM) at Large Hadron Collider (LHC) is studied based on a realistic
simulation. We consider the LFV decay of the second-lightest neutralino,
$\tilde{\chi}^0_2 \to \t...
Yeong Gyun Kim, Mihoko M. Nojiri
Prog.Theor.Phys. 106 (2001) 561-575   106:561-575    2001年4月
We investigate the implications of the recent measurement of muon anomalous
magnetic moment for the direct detection of neutralino dark matter in the three
different SUSY models: mSUGRA, a model with non-universal Higgs mass, and an
SO(10) GUT mod...
Junji Hisano, Mihoko M. Nojiri, Yasuhiro Shimizu, Minoru Tanaka
Phys.Rev. D60 (1999) 055008      1998年8月
The Super-Kamiokande atmospheric neutrino data suggest existence of the large
lepton-flavor violating (LFV) interaction in the higher energy scale. If the
minimal supersymmetric standard model is extended to have right-handed
neutrinos, the left-h...
Junji Hisano, Mihoko M. Nojiri, Nobuchika Okada
Phys.Rev. D64 (2001) 023511   (D64) 023511   2001年2月
The gauge-mediated SUSY-breaking (GMSB) model needs entropy production at a
relatively low temperature in the thermal history of the Universe for the
unwanted relics to be diluted. This requires a mechanism for the baryogenesis
after the entropy p...
野尻 美保子
素粒子論研究   102(4) D5-D12   2001年1月
We show that LHC experiments might well be able to determine all the parameters required for a prediction of the present density of thermal LSP relics from the Big Bang era. If the LSP is an almost pure bino we usually only need to determine its m...
Shingo Kiyoura, Mihoko M. Nojiri, Damien M. Pierce, Youichi Yamada
Phys.Rev. D58 (1998) 075002   58 075002   1998年3月
Recently it has been realized that the production and decay processes of
charginos, neutralinos, and sleptons receive corrections which grow like log
m_squark for large m_squark. In this paper we calculate the chargino pair
production cross sectio...
HISANO J, KOHRI K, NOJIRI M M
Phys. Lett   505(1/4) 169-176   2001年
Mihoko M. Nojiri, Daisuke Toya, Tomio Kobayashi
Phys.Rev.D62:075009,2000      2000年1月
We study the distribution of lepton pairs from the second lightest neutralino
decay \tilde{\chi}^0_2-->\tilde{l}l followed by \tilde{l}\to \tilde{\chi}^0_1
l. The distribution of the ratio of lepton transverse momenta A_T shows peak
structure if m...

書籍等出版物

 
堺井 義秀, 山田 憲和, 野尻 美保子
共立出版   2012年   ISBN:9784320034846

所属学協会

 
 

競争的資金等の研究課題

 
文部科学省: 科学研究費補助金(新学術領域研究(研究領域提案型))
研究期間: 2011年 - 2012年    代表者: 野尻 美保子
文部科学省: 科学研究費補助金(基盤研究(C))
研究期間: 2010年 - 2012年    代表者: 野尻 美保子
1)LHC実験においては、重たい粒子の生成にともなって、かなりハードなinitial state radiationがおこる。このinitial state radiationはpartonの種類によって異なる分布をとる。このISRの分布を細かく研究し、ハードプロセスとの違いを明らかにした。この分布からISRを除く最適のカットを開発し、超対称粒子の質量のMT2分布に表れend pointを崩壊形式によらずに求める方法を明らかにした。2)一つのクオークやグルーオンから作られるジェットはケンブ...
文部科学省: 科学研究費補助金(基盤研究(B))
研究期間: 2006年 - 2009年    代表者: 野尻 美保子
LHC実験において標準模型を越える物理がどのように明らかにされるかを研究し、またLHCの物理の定量的な研究によって、暗黒物質、フレーバーの物理をさらに深く理解できることを明らかにした。
文部科学省: 科学研究費補助金(特定領域研究)
研究期間: 2004年 - 2009年    代表者: 野尻 美保子
LHC実験では標準模型を越える粒子が生成され、その崩壊が観測されると期待されている。このような模型の中でも、超対称模型に代表される暗黒物質の候補ををもつ模型についてLHC実験によって、新粒子の質量・相互作用を測定する方法について研究を行い、MT2の活用、end pointに寄らない質量決定法、Initial state radiationの除去法等について成果をあげた。
文部科学省: 科学研究費補助金(基盤研究(C))
研究期間: 2002年 - 2005年    代表者: 野尻 美保子
超対称粒子からなる暗黒物質の密度はその相互作用を決定することによって決まるため、LHCなどの将来の加速器実験において実際に超対称模型のパラメータをどの程度決定できるかを明らかにする研究を行った。LHC実験においては、スカラークオークやグルイーノなどカラーをもった超対称粒子が主に生成され、その崩壊の最終段階において暗黒物質であるLSPが生成される。LSPは荷電中性であり、また宇宙年齢程度に安定であるため、直接その運動量を測定することができない。しかし、ジェットやレプトンの運動量分布を調べるこ...