J-GLOBAL         Last updated: Aug 20, 2018 at 12:56
Tokyo Metropolitan University
Graduate School of Science, Department of Physics
Job title
Assistant Professor
Dr. of Sci.(Nagoya University)

Research Areas


Academic & Professional Experience

Oct 1994
Assistant Professor, Department of Physics, Tokyo Metropolitan University
JSPS Fellow
Research Associate(Yale University)

Published Papers

Noriaki Kitazawa, Kyo-suke Masukawa, Yuki Sakai
   Feb 2018
We propose a method of extracting the Cabibbo-Kobayashi-Maskawa matrix element Tex from two-body hadronic decay processes of Tex with precisely determined form factors of Tex meson semi-leptonic decays. The amplitude $\mathcal{M}(\bar...
Noriaki Kitazawa
   Feb 2018
Supergravity models with spontaneously broken supersymmetry have been widely investigated over the years, together with some notable non-linear limits. Although in these models the gravitino becomes naturally massive absorbing the degrees of freed...
Satoshi Iso, Noriaki Kitazawa, Sumito Yokoo
   Dec 2017
In this note, we investigate the electromagnetic radiation emitted from a revolving point charge in a compact space. If the point charge is circulating with an angular frequency Tex on the Tex-plane at Tex with boundary conditions, $x...
Noriaki Kitazawa, Yuki Sakai
   Jul 2017
We discuss the constraint on the size of QCD instanton effects in low-energy effective theory. Among various instanton effects in meson mass spectrum and dynamics, we concentrate on the instanton-induced masses of light quarks. The famous instanto...
Noriaki Kitazawa
   Jun 2017
We discuss the effect of the dynamics of D-branes on moduli stabilization in type IIB string theory compactifications, with reference to a concrete toy model of T6/Z3 orientifold compactification with fractional D3-branes and anti-D3-branes at orb...
Naoyuki Haba, Hiroyuki Ishida, Noriaki Kitazawa, Yuya Yamaguchi
   Dec 2015
We propose a new dynamics of the electroweak symmetry breaking in a classically scale invariant version of the standard model. The scale invariance is broken by the condensations of additional fermions under a strong coupling dynamics. The electro...
Noriaki Kitazawa, Yuki Sakai
   Sep 2015
We examine the possibility of observing the Kaluza-Klein gluons in gauge-Higgs unification models at the LHC with the energy sqrt{s}=14 TeV. We consider a benchmark model with the gauge symmetry SU(3)_C x SU(3)_W in five-dimensional space-time, wh...
Satoshi Iso, Noriaki Kitazawa
   Jul 2015
We propose a new mechanism of spontaneous gauge symmetry breaking in the world-volume theory of revolving D-branes around a fixed point of orbifolds. In this paper, we consider a simple model of the T6/Z3 orbifold on which we put D3-branes, D7-bra...
Noriaki Kitazawa
   Sep 2014
All the models of elementary particles and their interactions derived from String Theory involve a compact six-dimensional internal space. Its volume and shape should be fixed or stabilized, since otherwise massless scalar fields (moduli) reflecti...
Manami Hashi, Noriaki Kitazawa
   Dec 2012
Low-scale string models are phenomenological models in String Theory, in which the string scale M_s is of the order of TeV. String excited states which are characteristic modes in low-scale string models can be observed as resonances in dijet inva...
Noriaki Kitazawa, Shutaro Kobayashi
   Nov 2012
We investigate a D-brane system in which spontaneous gauge symmetry breaking occurs. The system consists of four D3-branes and three anti-D7-branes at C^3/Z_3 singularity. The singularity is blown up by vacuum expectation values of the states of t...
Manami Hashi, Noriaki Kitazawa
JHEP 02 (2012) 050      Oct 2011
Low-scale string models, in which the string scale M_s is of the order of TeV with large extra dimensions, can solve the problems of scale hierarchy and non-renormalizable quantum gravity in the standard model. String excited states of the standar...
Noriaki Kitazawa
JHEP 1010:051,2010      Aug 2010
The first string excited state can be observed as a resonance in dijet invariant mass distributions at the LHC, if the scenario of low-scale string with large extra dimensions is realized. A distinguished property of the dijet resonance by string ...
Noriaki Kitazawa
Int.J.Mod.Phys.A25:2679-2698,2010      Aug 2009
The possibility of dynamical electroweak symmetry breaking by strong coupling gauge interaction in models with D-branes in String Theory is examined. Instead of elementary scalar Higgs doublet fields, the gauge symmetry with strong coupling (techn...
Noriaki Kitazawa
Journal of High Energy Physics (JHEP)   (9)    May 2008
In phenomenological models with D-branes, there are in general open-string massless scalar fields, in addition to closed-string massless moduli fields corresponding to the compactification. It is interesting to focus on the fate of such scalar fie...
Noriaki Kitazawa
Physics Letters   660(4) 415-421   Jan 2008
While R-R tadpoles should be canceled for consistency, string models with broken supersymmetry generally have uncanceled NS-NS tadpoles. Their presence signals that the background does not solve the field equations, so that these models are in "wr...
Noriaki Kitazawa
   Feb 2007
We examine the possibility of necessary and inevitable radiative electroweak symmetry breaking by one-loop radiative corrections in a class of string models which are the string realization of "brane world" scenario. As an example, we consider a s...
Noriaki Kitazawa
Nuclear Physics   755(1-3) 254-271   Jun 2006
The possibility of radiative gauge symmetry breaking on D3-branes at non-supersymmetric orbifold singularities is examined. As an example, a simple model of D3-branes at non-supersymmetric C^3/Z_6 singularity with some D7-branes for the cancellati...
Noriaki Kitazawa, Hiroaki Sugiyama, Osamu Yasuda
   Jun 2006
The effect of non-standard neutrino interactions with matter at long baseline neutrino experiments is examined in a model independent way, taking into account the constraints from all the experiments. It is found that such a non-standard interacti...
Noriaki Kitazawa
AIPConf.Proc.881:73-81,2007      Sep 2005
We propose a scenario of the electroweak symmetry breaking by one-loop radiative corrections in a class of string models with D3-branes at non-supersymmetric orbifold singularities with the string scale in TeV region. As a test example, we conside...
Naoyuki Haba, Noriaki Kitazawa, Nobuchika Okada
Acta Phys.Polon.B40:67-74,2009      Apr 2005
We propose a scenario of dynamical electroweak symmetry breaking which is applicable to the model with no tree-level potential for the elementary Higgs doublet field. An example of such a model is the gauge-Higgs unification model. The strong coup...
HIGAKI Tetsutaro, KITAZAWA Noriaki, KOBAYASHI Tatsuo, TAKAHASHI Kei‐jiro
Physical Review   72(8) 1-86003   Apr 2005
We study flavor structure and the coupling selection rule in intersecting D-brane configurations. We formulate the selection rule for Yukawa couplings and its extensions to generic n-point couplings. We investigate the possible flavor structure, w...
Noriaki Kitazawa
Journal of High Energy Physics (JHEP)   11, 044    Sep 2004
We propose a scenario to obtain non-trivial Yukawa coupling matrices for the quark-lepton mass generation in supersymmetric intersecting D-brane models in type IIA T^6/Z_2 x Z_2 orientifold. As an example, an explicit model is constructed in which...
European Physical Journal   40(4) 579-587   Jun 2004
The structure of Yukawa coupling matrices is investigated in type IIA T^6/(Z_2 x Z_2) orientifold models with intersecting D-branes. Yukawa coupling matrices are difficult to be realistic in the conventional models in which the generation structur...
Nuclear Physics   B699(1/2) 124-134   Jan 2004
We construct supersymmetric composite models of quarks and leptons from type IIA T^6/(Z_2 x Z_2) orientifolds with intersecting D6-branes. In case of T^6 = T^2 x T^2 x T^2 with no tilted T^2, a composite model of the supersymmetric SU(5) grand uni...
Modern Physics Letters   19(9) 681-692   Sep 2003
The gaugino propagator is calculated by explicitly considering the propagation of a heterotic string between two different points in space-time using the non-trivial world-sheet conformal field theory for the fivebrane background. We find that the...
Physical Review   68(2) 1-26005   Apr 2003
The fermion propagators in the fivebrane background of type II superstring theories are calculated. The propagator can be obtained by explicitly evaluating the transition amplitude between two specific NS-R boundary states by the propagator operat...
Modern Physics Letters   17(40) 2617-2625   Aug 2002
The explicit form of the fermionic zero-modes in the fivebrane backgrounds of type IIA and IIB supergravity theories is investigated. In type IIA fivebrane background there are four zero-modes of gravitinos and dilatinos. In type IIB fivebrane bac...
Progress of Theoretical Physics   110(6) 1211-1217   Aug 2002
We investigate the explicit form of the fermionic zeromodes in heterotic fivebrane backgrounds. By explicitly solving the fermionic field equations in fivebrane backgrounds, two normalizable and physical fermionic zeromodes are obtained. Each of t...
Noriaki Kitazawa
Phys.Rev. D65 (2002) 086004      Aug 2001
We calculate the tension of the D3-brane in the fivebrane background which is described by the exactly solvable SU(2)_k x U(1) world-sheet conformal field theory with large Kac-Moody level k. The D3-brane tension is extracted from the amplitude of...
Noriaki Kitazawa, Nobuhito Maru, Nobuchika Okada
Phys.Rev. D63 (2001) 015005      Jul 2000
We propose a simple scenario of the dynamical supersymmetry breaking in four dimensional supergravity theories. The supersymmetry breaking sector is assumed to be completely separated as a sequestered sector from the visible sector, except for the...
Noriaki Kitazawa, Nobuhito Maru, Nobuchika Okada
Nuclear Physics   B586, 261-274    Mar 2000
We present simple models of dynamical supersymmetry breaking with gauged U(1)_R symmetry. The minimal supersymmetric standard model and supersymmetric SU(5) GUT are considered as the visible sector. The anomaly cancellation conditions for U(1)_R a...
Noriaki Kitazawa, Nobuhito Maru, Nobuchika Okada
Phys.Rev. D62 (2000) 077701      Nov 1999
We propose a simple model of dynamical supersymmetry breaking in the context of minimal supergravity with gauged Tex symmetry. The model is based on the gauge group Tex with three matters. Since the Tex symmetry is gaug...
Noriaki Kitazawa
   Sep 1999
It is shown that the auxiliary field in the low-energy effective theory of the supersymmetric QCD (SU(N_c) gauge symmetry with flavors N_f < N_c) can be understood as a physical degree of freedom, once the supersymmetry is explicitly broken. Altho...
Masato Arai, Noriaki Kitazawa
   Apr 1999
To obtain some exact results of U(1) gauge theory (QED), we construct the low energy effective action of N=2 supersymmetric QED with a massless matter and Fayet-Iliopoulos term, assuming no confinement. The harmonic superspace formalism for N=2 ex...
Noriaki Kitazawa
Phys.Rev. D61 (2000) 056008      Jan 1999
The strength of the dynamically generated Yukawa coupling among composite fields is calculated. The system of N=1 supersymmetric SU(2) gauge theory with massive three flavors is considered as an example. We use the techniques of "integrating in" t...
Noriaki Kitazawa
Int.J.Mod.Phys. A14 (1999) 4237-4258      Jun 1998
A mechanism to have the quark mass hierarchy in the supersymmetric composite model is proposed. The source of the hierarchy is the kinetic-term mixing between composite quarks. Such mixing can be expected, if quarks are composite particles. A mode...
Noriaki Kitazawa, Francesco Sannino
   Mar 1998
A new method of deriving the Higgs Lagrangian from vector-like gauge theories is explored. After performing a supersymmetric extension of gauge theories we identify the auxiliary field associated with the "meson" superfield, in the low energy effe...
Noriaki Kitazawa
   Dec 1997
We propose a supersymmetric composite model with three generations in which supersymmetry and electroweak symmetry are broken dynamically, and masses of quarks and leptons are generated without introducing any mass scales by hand. All the mass sca...
Noriaki Kitazawa
   Feb 1997
A guiding principle to determine the Kaehler potential in the low energy effective theory of the supersymmetric chiral gauge theory with no flat direction is proposed. The guiding principle is applied to the SU(5) gauge theory with chiral superfie...
Physical Review   56(5) 2842-2851   Jan 1997
We present a supersymmetric composite model with dynamical supersymmetry breaking. The model is based on the gauge group Tex. Supersymmetry is dynamically broken by the non-perturbat...
Noriaki Kitazawa
Nuclear Physics   B479, 336-350    Jul 1996
The low energy effective theory of the N=1 supersymmetric SU(5) gauge theory with chiral superfields in the 5* and 10 representations is constructed. Instead of postulating the confinement of SU(5) (confining picture), only the confinement of its ...
Physics Letters   380(3/4) 324-330   Feb 1996
A simple model of the Majorana neutrino with the see-saw mechanism is studied, assuming that two light neutrinos are the hot dark matters with equal mass of 2.4 eV in the cold plus hot dark matter model of cosmology. We find that the heavy neutrin...
Physical Review D   52(9) 5374-5377   Apr 1995
We show that the flavor-diagonal gauge boson of the extended technicolor theory contributes with opposite sign to the standard model correction for the Tex vertex. This mechanism can naturally explain the deviation of the LEP result from the sta...
Physics Letters B   349(4) 541-547   Sep 1994
We propose a strategy of the model-independent determination of the Kobayashi-Maskawa matrix element Tex within the framework of the heavy meson effective theory. The effective theory is model-independent, since no assumption on the dynamic...
Noriaki Kitazawa
   Jan 1994
The extended technicolor theory is a candidate of the physics beyond the standard model. To explain the mass hierarchy of the quarks and leptons, the extended technicolor gauge symmetry must hierarchically break to the technicolor gauge symmetry. ...


Physics Letters B   323 ,65    1994
Physics Letters B   313 ,395    1993
Physical Riview D   46, 3117    1992
Modern Physics Letters A   6, 3691    1991
Vacuum Alignment in the Top Quark Condensation
Physics Letters B   257, 383    1991
Physics Letters   B383, 78-86    1996
Quark Mass Hierarchy in the Supersymmetric Composite Model
International Journal of Modern Physics A   14, 4237-4258    1999
Determination of the Dynamically Generated Yukawa Coupling in Supersymmetric QCD
Physical Review D   61, 056008    2000
R-mediation of dynamical supersymmetry breaking
Physical Review   D63, 015005    2001
Dynamical supersymmetry breaking with gauged U(1)R symmetry
Physical Review   D62, 077701    2000
Granvitino condensation in fivebrane background
Physical Review   D65, 086004    2002
Invisible Technicolor
Naoyuki Haba, Noriaki Kitazawa and Nobuchika Okada
Acta Physica Polonica   B40 67   2009

Research Grants & Projects

Mechanism of mass generation
Elementary particle models from string theory