144 citations · 600 across the 19 of their papers we have counts for
18 papers · 1 filter
Counting the number of Feynman Graphs in QCD
T. Kaneko
Information about the number of Feynman graphs for a given physical process in a given field theory is especially useful for confirming the result of a Feynman graph generator used…
One loop integration with hypergeometric series by using recursion relations
Norihisa Watanabe, Toshiaki Kaneko
General one-loop integrals with arbitrary mass and kinematical parameters in -dimensional space-time are studied. By using Bernstein theorem, a recursion relation is obtained wh…
Numerical calculation of one-loop integration with hypergeometric functions
Toshiaki Kaneko
One-loop two-, three- and four-point scalar functions are analytically integrated directly such that they are expressed in terms of Lauricella's hypergeometric function . For…
Broken Symmetry in Flavor Physics
Toshiaki Kaneko, Hirotaka Sugawara
The symmetry is shown to be a very good approximate symmetry when it is broken in a specific way. This is true both in quark sector and in lepton sector. The way to break it…
Sector decomposition via computational geometry
Toshiaki Kaneko, Takahiro Ueda
A non-iterative method is presented for the factorization step of sector decomposition method, which separates infrared divergent part from loop integration. This method is based o…
A geometric method of sector decomposition
Toshiaki Kaneko, Takahiro Ueda
We propose a new geometric method of IR factorization in sector decomposition. The problem is converted into a set of problems in convex geometry. The latter problems are solved us…
GR@PPA 2.7 event generator for / collisions
S. Tsuno, T. Kaneko, Y. Kurihara +2
The GR@PPA event generator has been updated to version 2.7. This distribution provides event generators for ( or ) + jets ( 4 jets), + jets ( 2 jets) and…
Multi-leg calculations with the GRACE/1-LOOP system. --Toward Radiative Corrections to e+e- -> mu nu-bar u d-bar --
F. Boudjema, J. Fujimoto, T. Ishikawa +4
We performed the calculation of the full O(alpha) corrections to e+e- -> mu- nu-bar u d-bar with the help of the GRACE/1-LOOP system. We discuss how a finite decay width introduces…
GRACE/SUSY Automatic Generation of Tree Amplitudes in the Minimal Supersymmetric Standard Model
J. Fujimoto
GRACE/SUSY is a program package for generating the tree-level amplitude and evaluating the corresponding cross section of processes of the minimal supersymmetric extension of the s…
Automatic Computation of Cross Sections in HEP
F. Yuasa, J. Fujimoto, T. Ishikawa +10
For the study of reactions in High Energy Physics (HEP) automatic computation systems have been developed and are widely used nowadays. GRACE is one of such systems and it has achi…
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…
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…
Automatic Calculation of SUSY-particle Production
Masato Jimbo, Hidekazu Tanaka, Tadashi Kon +2
We introduce a new method to treat Majorana fermions and interactions with fermion-number violation on the GRACE system which has been developed for the automatic computation of th…
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…
NUMERICAL APPROACH TO TWO-LOOP THREE POINT FUNCTIONS WITH MASSES
J. FUJIMOTO, Y. SHIMIZU, K. KATO +1
Extending the method successful for one-loop integrals, the computation of two-loop diagrams with general internal masses is discussed. For the two-loop vertex of non-planar type,…
A System for the Automatic Computation of Cross-Sections Including SUSY Particles
Masato JIMBO, Tadashi KON, Hidekazu TANAKA +2
We introduce a new method to treat Majorana fermions on the GRACE system, which has already been developed for the computation of the matrix elements for the processes of the stand…
The SUSY-GRACE system
Masato JIMBO, Hidekazu TANAKA, Toshiaki KANEKO +2
We introduce a new method to treat Majorana fermions on the GRACE system which has been developed for the computation of the matrix elements for the processes of the standard model…