Spin Effects in Forward pi⁰-production in Polarized Proton-Proton Collisions at STAR

2005/05/11 by D. A. Morozov, Morozov, D. A.
Physics and Astronomy · #Particle physics theoretical and experimental studies #High-Energy Particle Collisions Research #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.hep-ex/0505024

Abstract

We report some results in large pseudo rapidity pi⁰-production in polarized proton collisions at 200 GeV center of mass energy. The single spin asymmetry for positive Feynman x (x_F) is consistent with zero up to ~0.35, then increases with increasing x_F. This behavior can be described by phenomenological models including the Sivers effect, Collins effect or twist-3 contributions in initial and final states. The asymmetry is found to be zero for negative x_F (-0.6pi⁰+X cross sections at η=3.3, 3.8 and 4.0 are consistent with next-to-leading order perturbative QCD calculations.

Related

• Spin effects in large rapidity pi0 production at STAR
• Measurements of transverse spin effects in the forward region with the STAR detector
• Transverse single spin asymmetry for very forward π⁰ production in polarized proton-proton collisions at √(s) = 510 GeV
• Transverse Spin Asymmetries in the p^\uparrowp→ pπ⁰ X Process at STAR
• Transverse Single Spin Asymmetries and Cross-Sections for Forward pi0 and eta Mesons at Large Feynman-x in sqrt(s)=200 GeV polarized p+p Collisions at STAR