39 citations · 83 across the 13 of their papers we have counts for
14 papers
Analytic and numerical approaches for depictive 3-loop integrals using sector decomposition
Elise de Doncker, Tadashi Ishikawa, Kiyoshi Kato +1
Four 3-loop two-point functions are studied analytically and numerically using a simplified sector decomposition method. The coefficients of the ultraviolet divergent part are dete…
A development of an accelerator board dedicated for multi-precision arithmetic operations and its application to Feynman loop integrals II
H Daisaka, N Nakasato, T Ishikawa +2
Evaluation of a wide variety of Feynman diagrams with multi-loop integrals and physical parameters and its comparison with high energy experiments are expected to investigate new p…
A development of an accelerator board dedicated for multi-precision arithmetic operations and its application to Feynman loop integrals
Shinji Motoki, Hiroshi Daisaka, Naohito Nakasato +5
Higher order corrections in perturbative quantum field theory are required for precise theoretical analysis to investigate new physics beyond the Standard Model. This indicates tha…
Numerical approach to multi-loop integrals
K. Kato, E. de Doncker, N. Hamaguchi +5
For the calculation of multi-loop Feynman integrals, a novel numerical method, the Direct Computation Method (DCM) is developed. It is a combination of a numerical integration and…
Numerical Approach to Calculation of Feynman Loop Integrals
F. Yuasa, T. Ishikawa, Y. Kurihara +5
In this paper, we describe a numerical approach to evaluate Feynman loop integrals. In this approach the key technique is a combination of a numerical integration method and a nume…
Numerical Evaluation of Feynman Integrals by a Direct Computation Method
F. Yuasa, T. Ishikawa, J. Fujimoto +3
A purely numerical method, Direct ComputationMethod is applied to evaluate Feynman integrals. This method is based on the combination of an efficient numerical integration and an e…
Full one-loop electroweak radiative corrections to single photon production in e+e-
F. Boudjema, J. Fujimoto, T. Ishikawa +6
Large scale calculation for the radiative corrections required for the current and future collider experiments can be done automatically using the GRACE-LOOP system. Here several r…
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…
GR@PPA_4b: A Four Bottom Quark Production Event Generator for PP/PPbar Collisions
S. Tsuno, K. Sato, J. Fujimoto +5
We have developed an event generator, named GR@PPA_4b, for the four bottom quark (b bbar b bbar) production processes at PP and PPbar collisions. The program implements all of the…
A Feynman graph selection tool in GRACE system
F. Yuasa, T. Kaneko, T. Ishikawa
We present a Feynman graph selection tool {\tt grcsel}, which is an interpreter written in C language. In the framework of {\tt GRACE}, it enables us to get a subset of Feynman gra…
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…
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…
Implementation of the Non-Linear Gauge into GRACE
G. Belanger, F. Boudjema, J. Fujimoto +6
A general non-linear gauge condition is implemented into GRACE, an automated system for the calculation of physical processes in high-energy physics. This new gauge-fixing is used…
Four-quark final state in W-pair production: Case of signal and background
T. Ishikawa, Y. Kurihara, M. Skrzypek +1
We discuss theoretical predictions for W-pair production and decay at LEP2 and higher energies in a form suitable for comparison with raw data. We present a practical framework for…