scholarly journals Covariant method for calculating helicity amplitudes

1996 ◽  
Vol 53 (9) ◽  
pp. 5286-5292 ◽  
Author(s):  
Roberto Vega ◽  
Jose Wudka
Keyword(s):  
Helicity Amplitudes ◽  
Covariant Method

scholarly journals ZH production in gluon fusion: two-loop amplitudes with full top quark mass dependence

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Long Chen ◽  
Gudrun Heinrich ◽  
Stephen P. Jones ◽  
Matthias Kerner ◽  
Jonas Klappert ◽  
...  
Keyword(s):  
Top Quark ◽  
Quark Mass ◽  
Gluon Fusion ◽  
Top Quarks ◽  
Mass Dependence ◽  
Finite Part ◽  
Top Quark Mass ◽  
Helicity Amplitudes ◽  
Quark Mass Dependence ◽  
Loop Amplitudes

Abstract We present results for the two-loop helicity amplitudes entering the NLO QCD corrections to the production of a Higgs boson in association with a Z -boson in gluon fusion. The two-loop integrals, involving massive top quarks, are calculated numerically. Results for the interference of the finite part of the two-loop amplitudes with the Born amplitude are shown as a function of the two kinematic invariants on which the amplitudes depend.

The use of helicity amplitudes in superconvergent sum rules

1967 ◽  
Vol 51 (4) ◽  
pp. 1021-1032 ◽  
Author(s):  
R. Odorico
Keyword(s):  
Sum Rules ◽  
Helicity Amplitudes

Evaluation of helicity amplitudes

1987 ◽  
Vol 35 (1) ◽  
pp. 326-329 ◽  
Author(s):  
L. Lukaszuk ◽  
D. M. Siemienczuk ◽  
L. Szymanowski
Keyword(s):  
Helicity Amplitudes

Spinor Helicity Amplitudes Method

2015 ◽  
Vol 54 (8) ◽  
pp. 2813-2829
Author(s):  
Li Niu ◽  
Song Mao ◽  
Li Gang ◽  
Guo Jian-You
Keyword(s):  
Helicity Amplitudes

Factorization of Helicity Amplitudes at High Energies

1967 ◽  
Vol 18 (15) ◽  
pp. 628-629 ◽  
Author(s):  
G. C. Fox ◽  
Elliot Leader
Keyword(s):  
High Energies ◽  
Helicity Amplitudes

HELICITY AMPLITUDES FOR COLLIDING BEAM SCATTERING OF TWO SPIN 1/2 PARTICLES

1993 ◽  
Vol 08 (30) ◽  
pp. 5383-5407
Author(s):  
T.B. ANDERS ◽  
A.O. BARUT ◽  
W. JACHMANN
Keyword(s):  
Center Of Mass ◽  
Mass System ◽  
Intermediate Transformation ◽  
Beam System ◽  
Pair Annihilation ◽  
Helicity Amplitudes ◽  
Reaction Channels ◽  
Invariant Coupling ◽  
Exchange Scattering ◽  
The One

As a generalization and extension of the extensive tables of polarization asymmetries given in a previous work,1 we present here tables of helicity amplitudes for the scattering of two spin 1/2 particles in the colliding beam system (i.e. two incoming particles with opposite directions but not necessarily of equal momenta). The particles belonging to the same current may have different masses in order to describe particle excitations. The amplitudes are given for six different basic couplings connecting two vector vertices, a vector vertex at the one current and a derivative vector vertex at the other current, two derivative vector vertices, two tensor vertices, and two scalar vertices. The vertices include axial couplings by factors of type 1+cγ5. The amplitudes are written as expressions with 16 components in the six different reaction channels, namely the scattering of two fermions, of two antifermions, and of a fermion and an antifermion, the pair creation by pair annihilation, as well as the exchange scattering for two identical fermions or antifermions. The formulas may be used for an analysis which extracts the invariant coupling functions from the experimental data obtained in the colliding beam system directly without an intermediate transformation to the center of mass system.

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