Twist-three Fragmentation Function Contribution to the Single Spin Asymmetry in pp Collisions

Journal Article · Fri Jan 29 00:00:00 EST 2010 · Physics Letter B

DOI:https://doi.org/10.1016/j.physletb.2010.07.003· OSTI ID:981743

Kang, Zhong-Bo; Yuan, Feng; Zhou, Jian

We study the twist-three fragmentation function contribution to the single transverse spin asymmetries in inclusive hadron production in pp collisions, pp->h+X. In particular, we evaluate the so-called derivative contribution which dominates the spin asymmetry in the forward direction of the polarized proton. With certain parametrizations for the twist-three fragmentation function, we estimate its contribution to the asymmetry of pi0 production at RHIC energy. We find that the contribution is sizable and might be responsible for the big difference between the asymmetries in eta and pi0 productions observed by the STAR collaboration at RHIC.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: Nuclear Science Division
• DOE Contract Number: DE-AC02-05CH11231
• OSTI ID: 981743
• Report Number(s): LBNL-3049E; TRN: US1003870
• Journal Information: Physics Letter B, Journal Name: Physics Letter B
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
FRAGMENTATION
HADRONS
PRODUCTION
SPIN
STARS