Recent STAR Results from Charged Pion Production in Polarized pp Collisions at {radical}(s) = 200 GeV at RHIC

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

DOI:https://doi.org/10.1063/1.3215645· OSTI ID:21316909

Kocoloski, Adam ^[1]

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1. Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA 02139 (United States)

The STAR experiment at RHIC measures the longitudinal double-spin asymmetry A{sub LL} for a variety of final states in collisions of longitudinally polarized protons to constrain the polarized gluon distribution in the proton. Asymmetries for mid-rapidity charged pion production benefit from large cross-sections and the excellent tracking and particle identification capabilities of the STAR Time Projection Chamber. This contribution presents a measurement of the ratio of cross sections for inclusive {pi}{sup -} and {pi}{sup +} production using data collected in 2005, as well as a new measurement of A{sub LL} for charged pions opposite a jet obtained from the 2006 RHIC run.

• OSTI ID: 21316909
• 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
ASYMMETRY
BROOKHAVEN RHIC
COLLIDING BEAMS
CROSS SECTIONS
GEV RANGE
GLUONS
INCLUSIVE INTERACTIONS
JET MODEL
MULTIPARTICLE SPECTROMETERS
PARTICLE IDENTIFICATION
PARTICLE PRODUCTION
PARTICLE RAPIDITY
PIONS MINUS
PIONS PLUS
POLARIZATION
POLARIZED BEAMS
PROTON-PROTON INTERACTIONS
SPIN
TIME PROJECTION CHAMBERS