New Analysis of the Single Transverse-Spin Asymmetry for Hadron Production at RHIC

Abstract

We analyze the single transverse-spin asymmetry (SSAs) for inclusive hadron production in the $pp$ collision at RHIC based on the twist-3 mechanism in QCD. As an origin of SSAs, we take into account of all kinds of pole contributions associated with the twist-3 quark-gluon correlation functions in the polarized proton. By the inclusion of the soft-fermion-pole contribution in addition to the soft-gluon-pole contribution, we find SSAs observed at RHIC are better described for all kinds of mesons. $P_T$-dependence of the asymmetry and the comparison with the FNAL data are also presented.

16 pages, 6 figures; The figures and the table were changed by correcting the errors in the numerical calculation. Qualitative features stay the same and thus no changes in the text compared with the previous version

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• Master Formula for the Three-Gluon Contribution to Single Spin Asymmetry in Semi-Inclusive Deep Inelastic Scattering
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• New pole contribution to $P_{h\perp }$-weighted single-transverse spin asymmetry in semi-inclusive deep inelastic scattering
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• Twist-3 fragmentation effects for $A_{LT}$ in light hadron production from proton-proton collisions
• Single Transverse-Spin Asymmetry in Large $P_T$ Open Charm Production at an Electron-Ion Collider
• Single spin asymmetries in forward p-p/A collisions revisited: the role of color entanglement
• Probing the polarized photon content of the proton in $ep$ collisions at the EIC
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• On the contribution of twist-3 multi-gluon correlation functions to single transverse-spin asymmetry in SIDIS
• A new twist-3 analysis of the single transverse-spin asymmetry for pion and kaon production at RHIC
• Transverse Single-Spin Asymmetries of Midrapidity Direct Photons, Neutral Pions, and Eta Mesons in 200 GeV Polarized Proton-Proton Collisions at PHENIX