scholarly journals Probing Gluon Helicity with Dijets from $\sqrt s$ = 510 GeV Polarized Proton Collisions at STAR

2016 ◽  
Author(s):  
Suvarna Ramachandran
Keyword(s):  
Proton Collisions ◽  
Polarized Proton ◽  
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.

scholarly journals Transverse spin transfer to Λ and Λ¯ hyperons in polarized proton-proton collisions at s=200  GeV

2018 ◽  
Vol 98 (9) ◽  
Author(s):  
J. Adam ◽  
L. Adamczyk ◽  
J. R. Adams ◽  
J. K. Adkins ◽  
G. Agakishiev ◽  
...  
Keyword(s):  
Spin Transfer ◽  
Transverse Spin ◽  
Proton Proton ◽  
Proton Collisions ◽  
Polarized Proton ◽  
200 Gev ◽  
Proton Proton Collisions

scholarly journals Cross Section and Asymmetry Measurement of Very Forward Neutral Particle Production at RHIC

2016 ◽  
Vol 40 ◽  
pp. 1660110
Author(s):  
Yuji Goto
Keyword(s):  
Cosmic Rays ◽  
Particle Production ◽  
Spin Asymmetry ◽  
High Energy ◽  
Transverse Spin ◽  
Proton Collisions ◽  
High Energy Cosmic Rays ◽  
Air Shower ◽  
Production Processes ◽  
Polarized Proton

Although air shower observations at the surface of the earth have been developed in order to understand the origin of the ultra high energy cosmic rays, the observations have uncertainties in interpretation of the observed data from the present phenomenological nuclear collision models. Precision measurements of the very forward particle production in the collider experiments improve understanding of particle production processes in the nuclear collisions, and provide large influences on interpretation of the observed data and the origin of the cosmic rays. On the other hand, a large 10% single transverse-spin asymmetry in neutron production from transversely polarized proton collisions was found at the RHIC collider at BNL. It has provided a valuable input for understanding particle production processes in the polarized proton collisions. We will have a new collider experiment at RHIC which has a high resolution and a wide coverage of transverse momentum measurements in order to figure out elementary processes of the air shower generation.

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