Campus Units

Physics and Astronomy

Document Type

Article

Publication Version

Published Version

Publication Date

1-29-2013

Journal or Book Title

Physical Review D

Volume

87

Issue

1

First Page

012011

Last Page

012011

DOI

10.1103/PhysRevD.87.012011

Abstract

We report on the first measurement of the double-spin asymmetry, A(LL), of electrons from the decays of hadrons containing heavy flavor in longitudinally polarized p + p collisions at root s = 200 GeV for p(T) = 0.5 to 3.0 GeV/c. The asymmetry was measured at midrapidity (vertical bar eta vertical bar < 0.35) with the PHENIX detector at the Relativistic Heavy Ion Collider. The measured asymmetries are consistent with zero within the statistical errors. We obtained a constraint for the polarized gluon distribution in the proton of vertical bar Delta g/g(log(10)(x) = -1.6(-0.4)(+0.5), mu = m(T)(c)vertical bar(2) < 0.030 (1 sigma) based on a leading-order perturbative quantum chromodynamics model, using the measured asymmetry.

Comments

This is an article from Physical Review D 87 (2013): 012011-1, doi:10.1103/PhysRevD.87.012011. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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