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

Journal Article · Tue Aug 04 04:00:00 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, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1149; ISSN APCPCS; 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
ACCELERATORS
ANGULAR MOMENTUM
ASYMMETRY
BARYON-BARYON INTERACTIONS
BOSONS
BROOKHAVEN RHIC
CORRELATION FUNCTIONS
CROSS SECTIONS
ELECTRON PAIRS
ELEMENTARY PARTICLES
FACTORIZATION
FERMIONS
FUNCTIONS
GLUONS
HADRON-HADRON INTERACTIONS
HADRONS
HEAVY ION ACCELERATORS
INTERACTIONS
MESONS
NUCLEON-NUCLEON INTERACTIONS
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PIONS
PROTON-NUCLEON INTERACTIONS
PROTON-PROTON INTERACTIONS
PSEUDOSCALAR MESONS
QUARKS
SPIN
STORAGE RINGS