Soft-Fermion-Pole Mechanism to Single Spin Asymmetry in Hadronic Pion Production

Journal Article · Tue Aug 04 00:00:00 EDT 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3215735· OSTI ID:21344421

Koike, Yuji; Tomita, Tetsuya ^[1]

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1. Department of Physics, Niigata University, Ikarashi, Niigata 950-2181 (Japan)

Single spin asymmetry (SSA) is a twist-3 observable in the collinear factorization approach. We present a twist-3 single-spin-dependent cross section formula for the pion production in pp-collision, p{sup a}rrow upp->piX, relevant to RHIC experiments. In particular, we calculate the soft-fermion-pole (SFP) contribution to the cross section from the quark-gluon correlation functions. We show that its effect can be as large as the soft-gluon-pole (SGP) contribution owing to the large SFP partonic hard cross section, even though the derivative of the SFP function does not participate in the cross section.

• OSTI ID: 21344421
• Journal Information: AIP Conference Proceedings, Vol. 1149, Issue 1; Conference: SPIN 2008: 18. International Spin Physics Symposium, Charlottesville, VA (United States), 6-11 Oct 2008; Other Information: DOI: 10.1063/1.3215735; (c) 2009 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ASYMMETRY
BROOKHAVEN RHIC
CORRELATION FUNCTIONS
CROSS SECTIONS
ELECTRON PAIRS
FACTORIZATION
GLUONS
PARTICLE PRODUCTION
PIONS
PROTON-PROTON INTERACTIONS
QUARKS
SPIN
ACCELERATORS
ANGULAR MOMENTUM
BARYON-BARYON INTERACTIONS
BOSONS
ELEMENTARY PARTICLES
FERMIONS
FUNCTIONS
HADRON-HADRON INTERACTIONS
HADRONS
HEAVY ION ACCELERATORS
INTERACTIONS
MESONS
NUCLEON-NUCLEON INTERACTIONS
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
PROTON-NUCLEON INTERACTIONS
PSEUDOSCALAR MESONS
STORAGE RINGS