scholarly journals Measurement of Longitudinal Single-Spin Asymmetry for W$^{\pm}$ Production in Polarized Proton+Proton Collisions at STAR

2019 ◽  
Author(s):  
Qinghua Xu ◽  
Keyword(s):  
Spin Asymmetry ◽  
Single Spin Asymmetry ◽  
Proton Proton ◽  
Proton Collisions ◽  
Single Spin ◽  
Polarized Proton ◽  
Proton Proton Collisions

scholarly journals Transverse single spin asymmetry for very forward π0 production in polarized proton-proton collisions at √s = 510 GeV

2019 ◽  
Vol 208 ◽  
pp. 05007
Author(s):  
M. H. Kim ◽  
B. Hong ◽  
Y. Goto ◽  
I. Nakagawa ◽  
R. Seidl ◽  
...  
Keyword(s):  
Spin Asymmetry ◽  
Single Spin Asymmetry ◽  
Potential Contribution ◽  
Momentum Range ◽  
Proton Proton ◽  
Proton Collisions ◽  
Single Spin ◽  
New Information ◽  
Polarized Proton ◽  
Proton Proton Collisions

Transverse single spin asymmetry, AN, of very forward π0 production from polarized p + p collisions provides new information toward an understanding of its production mechanism. AN of forward π0 in the pseudorapidity region of 3 < η < 4 has been described by the partonic structure of the proton in the perturbative QCD framework. However, recent data indicates a potential contribution from not only partonic but also diffractive interactions. In order to provide a new insight on the origin of the AN, we measured the very forward π0 production in the pseudorapidity region of 6 < η from √s = 510 GeV polarized p + p collisions at RHIC in 2017. We report our measurement of the very forward π0 over the transverse momentum range of 0 < pT < 1 GeV/c and the preliminary result.

scholarly journals Measurement of Longitudinal Spin Asymmetries for Weak Boson Production in Polarized Proton-Proton Collisions at STAR

2016 ◽  
Vol 40 ◽  
pp. 1660019
Author(s):  
Jinlong Zhang
Keyword(s):  
Spin Asymmetry ◽  
Data Set ◽  
Proton Proton ◽  
Weak Boson ◽  
Spin Asymmetries ◽  
Proton Collisions ◽  
Double Spin ◽  
Polarized Proton ◽  
The Status ◽  
Proton Proton Collisions

The production of [Formula: see text] bosons in longitudinally polarized [Formula: see text] collisions is a powerful tool to study the spin-flavor structure of the proton. We report measurements of single- and double-spin asymmetries for [Formula: see text] and [Formula: see text] production in longitudinally polarized proton-proton collisions at [Formula: see text] GeV at RHIC. The single-spin asymmetry results for [Formula: see text] from data sets collected by STAR experiment in 2011 and 2012 provided new constraints on proton’s polarized sea quark distributions and prefer a sizable value for [Formula: see text] polarization. The status for the analysis of a much larger data set collected by STAR in 2013 will also be given.

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