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

The STAR experiment at RHIC measures the longitudinal double-spin asymmetry \(A_{LL}\) 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...

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Bibliographic Details
Published inarXiv.org
Main Authors Kocoloski, Adam, the STAR Collaboration
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 07.05.2009
Subjects
Collisions
Cross-sections
Pions
Quarks
Radiation counters
Skewed distributions
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Summary:The STAR experiment at RHIC measures the longitudinal double-spin asymmetry \(A_{LL}\) 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 \(\pi^{-}\) and \(\pi^{+}\) production using data collected in 2005, as well as a new measurement of \(A_{LL}\) for charged pions opposite a jet obtained from the 2006 RHIC run.
ISSN:2331-8422
DOI:10.48550/arxiv.0905.1033