144 citations · 423 across the 20 of their papers we have counts for
20 papers
Numerical Study on Spontaneous Symmetry Breaking in a XY Quantum Antiferromagnet on a Finite Triangular Lattice
Tomo Munehisa, Yasuko Munehisa
Motivated by recent experiments that require more complicated macroscopic wave functions in the condensed matters, we make numerical study on a XY quantum antiferromagnet on a fini…
Numerical study of the spin-1/2 Heisenberg antiferromagnet on a 48-site triangular lattice
Tomo Munehisa, Yasuko Munehisa
We numerically study the magnetization and the dispersion relation of a frustrated quantum spin system. Our method, which is named the stochastic state selection method, is a kind…
A constrained stochastic state selection method applied to quantum spin systems
Tomo Munehisa, Yasuko Munehisa
We describe a further development of the stochastic state selection method, which is a kind of Monte Carlo method we have proposed in order to numerically study large quantum spin…
An Equilibrium for Frustrated Quantum Spin Systems in the Stochastic State Selection Method
Tomo Munehisa, Yasuko Munehisa
We develop a new method to calculate eigenvalues in frustrated quantum spin models. It is based on the stochastic state selection (SSS) method, which is an unconventional Monte Car…
QCD event generators with next-to-leading order matrix-elements and parton showers
Y. Kurihara, J. Fujimoto, T. Ishikawa +4
A new method to construct event-generators based on next-to-leading order QCD matrix-elements and leading-logarithmic parton showers is proposed. Matrix elements of loop diagram as…
Numerical Study of Excited States in the Shastry-Sutherland Model
Tomo Munehisa, Yasuko Munehisa
We investigate excited states of the Shastry-Sutherland model using a kind of variational method. Starting from various trial states which include one or two triplet dimers, we num…
QED Radiative Correction for the Single-W Production using a Parton Shower Method
Y. Kurihara, J. Fujimoto, T. Ishikawa +4
A parton shower method for the photonic radiative correction is applied to the single W-boson production processes. The energy scale for the evolution of the parton shower is deter…
QED Radiative Corrections to the Non-annihilation Processes Using the Structure Function and the Parton Shower
Y. Kurihara, J. Fujimoto, Y. Shimizu +3
Inclusion of the QED higher order radiative corrections in the two-photon process, e+e- -> e+e- mu+mu-, is examined by means of the structure function and the parton shower. Result…
An Attempt to Calculate Energy Eigenvalues in Quantum Systems of Large Sizes
T. Munehisa, Y. Munehisa
We report an attempt to calculate energy eigenvalues of large quantum systems by the diagonalization of an effectively truncated Hamiltonian matrix. For this purpose we employ a sp…
Event generator for the single- and double-photon emission associated with neutrino pair-production
Y. Kurihara, J. Fujimoto, T. Ishikawa +2
A new event generator is proposed for two processes e+e- -> nu nu-bar gamma and e+e- -> nu nu-bar gamma gamma where nu includes all the neutrino species. The exact matrix elements…
susy23 v2.0: an Event Generator for Supersymmetric Processes at Colliders
J. Fujimoto, K. Hikasa, T. Ishikawa +11
\susy23 is a Monte-Carlo package for generating supersymmetric (SUSY) processes at colliders. Twenty-three types of SUSY processes with 2 or 3 final state particles at tre…
Event Generators for WW Physics
D. Bardin, R. Kleiss, E. Accomando +42
The report summarizes the results of the activities of the Working Group on Event Generators for WW Physics at CERN during 1995.
Quantum Monte Carlo Study of an Extended Hubbard Model on a Two-leg Ladder
Tomo Munehisa, Yasuko Munehisa
An extended Hubbard model on a two-leg ladder is numerically studied by means of the quantum Monte Carlo techniques. The model we study has the nearest-neighbor interactions which…
grc4f v1.1: a Four-fermion Event Generator for e+e- Collisions
J. Fujimoto, T. Ishikawa, T. Kaneko +7
grc4f is a Monte-Carlo package for generating e+e- to 4-fermion processes in the standard model. All of the 76 LEP-2 allowed fermionic final state processes evaluated at tree level…
grc4f v1.0: a Four-fermion Event Generator for e+e- Collisions
J. Fujimoto, T. Ishikawa, T. Kaneko +7
grc4f is a Monte-Carlo package for generating e+e- to 4-fermion processes in the standard model. All of the 76 LEP-2 allowed fermionic final state processes evaluated at tree level…
Improved QEDPS for Radiative Corrections in e+e- Annihilation
T. Munehisa, J. Fujimoto, Y. Kurihara +1
The generator QEDPS, a parton shower model in QED, developed by the present authors has been improved. By a careful study on the shower algorithm it was found that some finite cont…
A Parton Shower Model for Hadronic Two-Photon Process in e^+e^- Scatterings
T. Munehisa, P. Aurenche, J. -Ph. Guillet +2
A new model of QCD parton shower is proposed which is dedicated to two-photon process in scattering. When hadron jets are produced, the photon may resolve into quark-anti…
Re-Structuring Method for the Negative Sign Problem in Quantum Spin Systems
Tomo Munehisa, Yasuko Munehisa
We present detailed discussions on a new approach we proposed in a previous paper to numerically study quantum spin systems. This method, which we will call re-structuring method h…
Monte Carlo Approach to Radiative Corrections in Bhabha Scattering
J. Fujimoto, Y. Shimizu, T. Munehisa
A new Monte Carlo model is proposed for radiative corrections to Bhabha scattering by extending QEDPS developed for multi-photon emission in muon pair production in annihi…
An Improvement on the Negative Sign Problem in Numerical Calculations of a Quantum Spin System
Tomo Munehisa, Yasuko Munehisa
We propose new approach to numerical study of quantum spin systems. Our method is based on a fact that one can use any set of states for the path integral as long as it is complete…