Double-spin asymmetry of electrons from heavy-flavor decays in p+p collisions at $ \sqrt{s} $=200 GeV

Adare, A.; Awes, Terry C.; Cianciolo, Vince; Efremenko, Yuri V.; Enokizono, Akitomo; Read Jr, Kenneth F.; Silvermyr, David O.; Sorensen, Soren P.; Stankus, Paul W.; Young, Glenn R.; Collaboration, Phenix

doi:10.1103/PhysRevD.87.012011

Title: Double-spin asymmetry of electrons from heavy-flavor decays in p+p collisions at $$ \sqrt{s} $$=200 GeV

Journal Article · Tue Jan 01 00:00:00 EST 2013 · Physical Review. D, Particles, Fields, Gravitation and Cosmology

DOI:https://doi.org/10.1103/PhysRevD.87.012011· OSTI ID:1090476

Adare, A. ^[1]; Awes, Terry C. ^[2];

^[2]; Efremenko, Yuri V. ^[2]; Enokizono, Akitomo ^[2];

^[2]; Silvermyr, David O. ^[2];

^[2];

^[2]; Young, Glenn R. ^[2]; Collaboration, Phenix ^[3]

University of Colorado, Boulder
ORNL
PHENIX Collaboration

We report on the first measurement of the double-spin asymmetry, ALL, of electrons from the decays of hadrons containing heavy flavor in longitudinally polarized p+p collisions at $$ \sqrt{s} $$=200 GeV for p_T=0.5 to 3.0 GeV/c. The asymmetry was measured at midrapidity (|η|<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 |Δg/g(log₁₀x=-1.6^{$+0.5 -0.4$},μ=m^{$c T$})|²<0.030 (1σ) based on a leading-order perturbative quantum chromodynamics model, using the measured asymmetry.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1090476

Journal Information:: Physical Review. D, Particles, Fields, Gravitation and Cosmology, Vol. 87, Issue 1; ISSN 1550-7998

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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