scholarly journals Probing gluon helicity distribution and quark transversity through hyperon polarization in singly polarizedppcollisions

2004 ◽  
Vol 70 (3) ◽  
Author(s):  
Xu Qing-hua ◽  
Liang Zuo-tang
Keyword(s):  
Helicity Distribution ◽  
Gluon Helicity

scholarly journals Small x Asymptotics of the Quark and Gluon Helicity Distributions

2018 ◽  
Vol 172 ◽  
pp. 03006
Author(s):  
Yuri V. Kovchegov ◽  
Daniel Pitonyak ◽  
Matthew D. Sievert
Keyword(s):  
Perturbative Qcd ◽  
Evolution Equations ◽  
Leading Order ◽  
Helicity Distribution ◽  
Small X ◽  
Gluon Helicity

We determine the small-x asymptotics of the gluon helicity distribution in a proton at leading order in perturbative QCD at large Nc. To achieve this, we begin by evaluating the dipole gluon helicity TMD at small x. We then construct and solve novel small-x large-Nc evolution equations for the operator related to the dipole gluon helicity TMD. Our main result is the small-x asymptotics for the quark helicity distribution

scholarly journals Gluon Helicity Distribution at Small x

2018 ◽  
Author(s):  
Yuri Kovchegov ◽  
Daniel Pitonyak ◽  
Matthew Sievert
Keyword(s):  
Helicity Distribution ◽  
Small X ◽  
Gluon Helicity

scholarly journals Small-x asymptotics of the gluon helicity distribution

2017 ◽  
Vol 2017 (10) ◽  
Author(s):  
Yuri V. Kovchegov ◽  
Daniel Pitonyak ◽  
Matthew D. Sievert
Keyword(s):  
Helicity Distribution ◽  
Small X ◽  
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 Time-Mean Helicity Distribution in Turbulent Swirling Jets

10.14311/776 ◽  
2005 ◽  
Vol 45 (6) ◽  
Author(s):  
V. Tesař
Keyword(s):  
Spatial Distribution ◽  
Turbulent Flows ◽  
Large Time ◽  
Small Region ◽  
Density Profiles ◽  
Swirling Jets ◽  
Helicity Distribution ◽  
Alternative Approach ◽  
Starting Point ◽  
The Subject

Helicity offers an alternative approach to investigations of the structure of turbulent flows. Knowledge of the spatial distribution of the time-mean component of helicity is the starting point. Yet very little is known even about basic cases in which Helicity plays important role, such as the case of a swirling jet. This is the subject of the present investigations, based mainly on numerical flowfield computations. The region of significantly large time-mean helicity density is found only in a rather small region reaching to several nozzle diameters downstream from the exit. The most important result is the similarity of the helicity density profiles. 

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