The footprint of E7 in amplitudes of N=8 supergravity (2008)
Kallosh, Renata, Kugo, Taichiro
We study the low energy theorems associated with the non-linearly realized continuous E7 symmetry of the on-shell N=8 supergravity. For Nambu-Goldstone bosons we evaluate the...
The BV Master Equation for the Wilson Action in general Yang-Mills Gauge Theory (2007)
Higashi, Takeshi, Itou, Etsuko, Kugo, Taichiro
The Wilson effective action for general Yang-Mills gauge theory is shown to satisfy the usual form of Batalin-Vilkovisky (BV) master equation, despite that a momentum cutoff apparently breaks the...
Electric Dipole Moments of Dyon and `Electron' (2007)
Kobayashi, Makoto, Kugo, Taichiro, Tokunaga, Tatsuya
The electric and magnetic dipole moments of dyon fermions are calculated within N=2 supersymmetric Yang-Mills theory including the theta-term. It is found, in particular, that the gyroelectric ratio...
Pentaquark Baryons in String Theory (2004)
Bando, Masako, Kugo, Taichiro, Sugamoto, Akio, Terunuma, Sachiko
The recently observed pentaquark baryons $\Theta^{+}$ and $\Xi^{--}$ are studied in the dual gravity theory of QCD. By developing a general formulation useful for studying the branched string web in...
Implications of Bi-Large Neutrino Mixing on GUTs (2003)
Under the assumptions that 1) the quark/lepton mass matrices take Froggatt-Nielsen's factorized power form \lambda^{\psi_i+\psi_j} with anomalous U(1) charges \psi_i, and 2) the U(1) charges \psi_i...
Higgs Doublets as Pseudo Nambu-Goldstone Bosons in Supersymmetric E_6 Unification (2002)
The idea to have Higgs doublets as pseudo Nambu-Goldstone (PsNG) multiplet is examined in the framework of supersymmetric E_6 unified theory. We show that extra PsNG multiplets other than the...
Gauge and Non-Gauge Tensor Multiplets in 5D Conformal Supergravity (2002)
Kugo, Taichiro, Ohashi, Keisuke
An off-shell formulation of two distinct tensor multiplets,a massive tensor multiplet and a tensor gauge multiplet, is presented in superconformal tensor calculus in five-dimensional space-time. Both...
Superconformal Tensor Calculus on an Orbifold in 5D (2002)
Kugo, Taichiro, Ohashi, Keisuke
Superconformal tensor calculus on an orbifold S^1/Z_2 is given in five-dimensional (5D) spacetime. The four-dimensional superconformal Weyl multiplet and various matter multiplets are induced on the...
Off-Shell Formulation of Supergravity on Orbifold (2001)
Fujita, Tomoyuki, Kugo, Taichiro, Ohashi, Keisuke
An off-shell formulation is given for the ``supersymmetry in singular spaces'' which has recently been developed in an on-shell formalism by Bergshoeff, Kallosh and Van Proeyen using supersymmetry...
Novel Relations between Lepton and Quark Mixings (2000)
Bando, Masako, Kugo, Taichiro, Yoshioka, Koichi
A novel relation is found which gives the 2-3 lepton mixing angle in terms of quark masses and CKM mixing: \tan\theta_{\mu\tau}=(m_b/m_s)V_{cb}. This relation, which is remarkably in good agreement...
Probing extra dimensions using Nambu-Goldstone bosons (1999)
Kugo, Taichiro, Yoshioka, Koichi
We investigate a possibility that our four-dimensional world is a brane-like object embedded in a higher dimensional spacetime. In such a situation, the transverse coordinates of the brane become the...
One-Loop Tachyon Amplitude in Unoriented Open-Closed String Field Theory (1999)
Asakawa, Tsuguhiko, Kugo, Taichiro, Takahashi, Tomohiko
We calculate one-loop 2-point tachyon amplitudes in unoriented open-closed string field theory, and determine all the coupling constants of the interaction vertices in the theory. It is shown that...
Neutrino Masses in E_6 Unification (1999)
We show that the neutrino masses with large mixing between \nu_\mu and \nu_\tau are naturally reproduced in a supersymmetric E_6 grand unification model with an anomalous U(1)_X symmetry. We propose...
BRS Invariance of Unoriented Open-Closed String Field Theory (1998)
Asakawa, Tsuguhiko, Kugo, Taichiro, Takahashi, Tomohiko
We present the full action for the unoriented open-closed string field theory which is based on the \alpha=p^+ HIKKO type vertices. The BRS invariance of the action is proved up to the terms which...
On the Generalized Gluing and Resmoothing Theorem (1998)
Asakawa, Tsuguhiko, Kugo, Taichiro, Takahashi, Tomohiko
The generalized gluing and resmoothing theorem originally proved by LeClair, Peskin and Preitschopf, gives a powerful formula for the fused vertex obtained by contracting any two vertices in string...
Unoriented Open-Closed String Field Theory (1997)
Kugo, Taichiro, Takahashi, Tomohiko
The string field theory for unoriented open-closed string mixed system is constructed up to quadratic order based on the joining-splitting type vertices. The gauge invariance with closed string...
The ratio Z_1/Z_3 of vertex and wave-function renormalization factors, which is universal (i.e., matter-independent), is shown to equal 1+u which gives the residue of the scalar pole $\propto p_\mu...
Defining the Nambu--Jona-Lasinio Model by Higher Derivative Kinetic Term (1994)
HAMAZAKI, Takashi, KUGO, Taichiro
Usual treatment of the Nambu--Jona-Lasinio (NJL) model using loop momentum cutoff suffers from ambiguities in choosing the loop momenta to be cut off and violation of (external) gauge invariance. We...
Dynamical Symmetry Breaking in an E_6 GUT Model (1994)
Dynamical symmetry breaking is studied in an E_6 GUT model of a single generation of fermions with strong 4-fermi interactions. The effective potential is analyzed analytically by the help of...
External Gauge Invariance and Anomaly in BS Vertices and Boundstates (1993)
Bando, Masako, Harada, Masayasu, Kugo, Taichiro
A systematic method is given for obtaining consistent approximations to the Schwinger-Dyson(SD) and Bethe-Salpeter(BS) equations which maintain the external gauge invariance. We show that for any...
Isgur-Wise Function from Bethe-Salpeter Amplitude (1993)
Kugo, Taichiro, Mitchard, Mark G., Yoshida, Yuhsuke
We develop the improved ladder approximation to QCD in order to apply it to the heavy quark mesons. The resulting Bethe-Salpeter equation is expanded in powers of the inverse heavy quark mass 1/M,...
Proving the Low Energy Theorem of Hidden Local Symmetry (1993)
Harada, Masayasu, Kugo, Taichiro, Yamawaki, Koichi
Based on the Ward-Takahashi identity for the BRS symmetry, we prove to all orders of the loop expansion the low energy theorem of hidden local symmetry for the vector mesons (KSRF (I) relation) in...
Low Energy Theorems of Hidden Local Symmetries (1993)
Harada, Masayasu, Kugo, Taichiro, Yamawaki, Koichi
We prove to all orders of the loop expansion the low energy theorems of hidden local symmetries in four-dimensional nonlinear sigma models based on the coset space $G/H$, with $G$ and $H$ being...
Improving the Effective Potential (1992)
Bando, Masako, Kugo, Taichiro, Maekawa, Nobuhiro, Nakano, Hiroaki
A general procedure is presented how to improve the effective potential by using the renormalization group equation (RGE) in MS bar scheme. If one knows the L-loop effective potential and the RGE...
Improving the Effective Potential:Multi-Mass-Scale Case (1992)
Bando, Masako, Kugo, Taichiro, Maekawa, Nobuhiro, Nakano, Hiroaki
Previously proposed procedure for improving the effective potential by using renormalization group equation (RGE) is generalized so as to be applicable to any system containing several different mass...
Target Space Duality as a Symmetry of String Field Theory (1992)
Kugo, Taichiro, Zwiebach, Barton
Toroidal backgrounds for bosonic strings are used to understand target space duality as a symmetry of string field theory and to study explicitly issues in background independence. Our starting point...