scholarly journals A two-loop four-gluon helicity amplitude in QCD

2000 ◽  
Vol 2000 (01) ◽  
pp. 027-027 ◽  
Author(s):  
Zvi Bern ◽  
Lance Dixon ◽  
David A Kosower
Keyword(s):  
Helicity Amplitude ◽  
Gluon Helicity

scholarly journals A two-loop five-gluon helicity amplitude in QCD

2013 ◽  
Vol 2013 (12) ◽  
Author(s):  
Simon Badger ◽  
Hjalte Frellesvig ◽  
Yang Zhang
Keyword(s):  
Helicity Amplitude ◽  
Gluon Helicity

scholarly journals A complete two-loop, five-gluon helicity amplitude in Yang-Mills theory

2015 ◽  
Vol 2015 (10) ◽  
Author(s):  
Simon Badger ◽  
Gustav Mogull ◽  
Alexander Ochirov ◽  
Donal O’Connell
Keyword(s):  
Helicity Amplitude ◽  
Yang Mills ◽  
Gluon Helicity

scholarly journals PHYSICS OF GLUON HELICITY

2014 ◽  
Vol 25 ◽  
pp. 1460028
Author(s):  
XIANGDONG JI ◽  
YONG ZHAO
Keyword(s):  
Matrix Element ◽  
Time Correlation ◽  
Spin Operator ◽  
Large Momentum ◽  
Time Correlation Functions ◽  
Gauge Invariant ◽  
Equal Time ◽  
Polarized Proton ◽  
Gluon Spin ◽  
Gluon Helicity

The total gluon helicity in a polarized proton is shown to be a matrix element of a gauge-invariant but nonlocal, frame-dependent gluon spin operator [Formula: see text] in the large momentum limit. The operator [Formula: see text] is fit for the calculation of the total gluon helicity in lattice QCD. This calculation also implies that parton physics can be studied through the large momentum limit of frame-dependent, equal-time correlation functions of quarks and gluons.

POLARIZED HADRO- AND PHOTOPRODUCTION OF HEAVY QUARKS IN NLO QCD

2003 ◽  
Vol 18 (08) ◽  
pp. 1477-1480
Author(s):  
I. BOJAK
Keyword(s):  
Heavy Quark ◽  
Heavy Quarks ◽  
Gluon Helicity ◽  
Shed Light

We present the first calculation of the complete NLO QCD corrections to the production of heavy flavors with longitudinally polarized hadrons. This reaction can be used at RHIC to extract the gluon helicity density and may shed light on the "heavy quark enigma". The theoretical uncertainties are briefly discussed.

scholarly journals Helicity amplitude analysis of ψ(3686)→γχcJ→γpp¯

2019 ◽  
Vol 949 ◽  
pp. 114805
Author(s):  
Jielei Zhang ◽  
Junying Lyu
Keyword(s):  
Helicity Amplitude ◽  
Amplitude Analysis

scholarly journals Full color two-loop six-gluon all-plus helicity amplitude

2020 ◽  
Vol 101 (7) ◽  
Author(s):  
Adam R. Dalgleish ◽  
David C. Dunbar ◽  
Warren B. Perkins ◽  
Joseph M. W. Strong
Keyword(s):  
Helicity Amplitude ◽  
Full Color

scholarly journals Helicity Amplitude Analysis of Z c (3900) ± in e + e − → π + π − J/ψ

2016 ◽  
Vol 33 (6) ◽  
pp. 061401
Author(s):  
Rong-Gang Ping ◽  
J. G. Messchendorp ◽  
Chang-Zheng Yuan
Keyword(s):  
Helicity Amplitude ◽  
Amplitude Analysis
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