Single-Spin Asymmetry in Pion Production in Polarized Proton-Proton Collisions and Odderon

2003 ◽  
pp. 281-292
Author(s):  
E. N. Antonov ◽  
E. Bartoš ◽  
A. Ahmedov ◽  
E. A. Kuraev ◽  
E. Zemlyanaya
Keyword(s):  
Pion Production ◽  
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 ANALYZING POWERS IN INCLUSIVE PION PRODUCTION AT HIGH ENERGY AND THE NUCLEON SPIN STRUCTURE

1999 ◽  
Vol 14 (21) ◽  
pp. 1403-1412 ◽  
Author(s):  
K. SUZUKI ◽  
N. NAKAJIMA ◽  
H. TOKI ◽  
K.-I. KUBO
Keyword(s):  
Pion Production ◽  
Spin Asymmetry ◽  
High Energy ◽  
Distribution Functions ◽  
Proton Proton ◽  
Model Calculations ◽  
Proton Collisions ◽  
Analyzing Powers ◽  
Polarized Proton ◽  
Proton Proton Collisions

Analyzing powers in inclusive pion production in high energy transversely polarized proton–proton collisions are studied theoretically in the framework of the quark recombination model. Calculations by assuming the SU(6) spin-flavor symmetry for the nucleon structure disagree with the experiments. We solve this difficulty by taking into account the realistic spin distribution functions of the nucleon, which differs from the SU(6) expectation at large x, with a perturbative QCD constraint on the ratio of the unpolarized valence distributions, u/d→5 as x→ 1. We also discuss the kaon spin asymmetry and find AN(K+)=-AN(K0) in the polarized proton–proton collisions at large x F .

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