scholarly journals Overview of Gluon Helicity Measurements at STAR

2019 ◽  
Author(s):  
Christopher Dilks
Keyword(s):  
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 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 POLARIZATION IN QCD

2006 ◽  
Vol 21 (08n09) ◽  
pp. 1819-1830
Author(s):  
JEAN-MARC LE GOFF
Keyword(s):  
Model Prediction ◽  
Main Part ◽  
Spin Structure ◽  
Standard Model Prediction ◽  
Muon Anomalous Magnetic Moment ◽  
Parton Distributions ◽  
Generalized Parton Distributions ◽  
Gluon Spin ◽  
The Standard Model ◽  
Gluon Helicity

We first deal with the muon anomalous magnetic moment which is found to differ from the standard model prediction by 2.7 σ. A new proposal will aim at reducing the error by a factor 2. The main part of the paper then deals with the spin structure of the nucleon which can be studied in terms of quark and gluon helicity distributions, quark transversity distributions and generalized parton distributions. The main recent results are first indications that the total gluon spin in the nucleon might be small and a first measurement of the Collins fragmentation function which is needed to extract transversity distributions from semi-inclusive DIS data.

scholarly journals Probing gluon helicity with heavy flavor at the Electron-Ion Collider

2021 ◽  
Vol 104 (11) ◽  
Author(s):  
Daniele Paolo Anderle ◽  
Xin Dong ◽  
Felix Hekhorn ◽  
Matthew Kelsey ◽  
Sooraj Radhakrishnan ◽  
...  
Keyword(s):  
Heavy Flavor ◽  
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
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