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Title: Longitudinal Double-Spin Asymmetries for π 0s in the Forward Direction for 510 GeV Polarized pp Collisions

Abstract

Here, the STAR Collaboration reports measurements of the longitudinal double-spin asymmetry, ALL, for neutral pions produced at forward directions in polarized proton-proton collisions, at a center-of-mass energy of 510 GeV. Results are given for transverse momenta in the range 2 < p T < 10 GeV/c within two regions of pseudorapidity that span 2:65 < η < 3:9. These results are sensitive to the polarized gluon parton distribution function, Δg(x), down to the region of Bjorken x ~ 10 -3. The asymmetries observed are less than +5 • 10 -3 in magnitude, and will help constrain the contribution to the spin of the proton from polarized gluons at low x, when combined with other measurements as part of a global analysis.

Authors:
 [1]
  1. Creighton Univ., Omaha, NE (United States). et al.
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Contributing Org.:
STAR Collaboration
OSTI Identifier:
1466859
Alternate Identifier(s):
OSTI ID: 1460730; OSTI ID: 1477349
Report Number(s):
BNL-207818-2018-JAAM
Journal ID: ISSN 2470-0010; TRN: US1901914
Grant/Contract Number:  
SC0012704; AC02-05CH11231
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 98; Journal Issue: 3; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Adam, Jaroslav. Longitudinal Double-Spin Asymmetries for π0s in the Forward Direction for 510 GeV Polarized pp Collisions. United States: N. p., 2018. Web. doi:10.1103/PhysRevD.98.032013.
Adam, Jaroslav. Longitudinal Double-Spin Asymmetries for π0s in the Forward Direction for 510 GeV Polarized pp Collisions. United States. doi:10.1103/PhysRevD.98.032013.
Adam, Jaroslav. Mon . "Longitudinal Double-Spin Asymmetries for π0s in the Forward Direction for 510 GeV Polarized pp Collisions". United States. doi:10.1103/PhysRevD.98.032013.
@article{osti_1466859,
title = {Longitudinal Double-Spin Asymmetries for π0s in the Forward Direction for 510 GeV Polarized pp Collisions},
author = {Adam, Jaroslav},
abstractNote = {Here, the STAR Collaboration reports measurements of the longitudinal double-spin asymmetry, ALL, for neutral pions produced at forward directions in polarized proton-proton collisions, at a center-of-mass energy of 510 GeV. Results are given for transverse momenta in the range 2 < pT < 10 GeV/c within two regions of pseudorapidity that span 2:65 < η < 3:9. These results are sensitive to the polarized gluon parton distribution function, Δg(x), down to the region of Bjorken x ~ 10-3. The asymmetries observed are less than +5 • 10-3 in magnitude, and will help constrain the contribution to the spin of the proton from polarized gluons at low x, when combined with other measurements as part of a global analysis.},
doi = {10.1103/PhysRevD.98.032013},
journal = {Physical Review D},
number = 3,
volume = 98,
place = {United States},
year = {2018},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevD.98.032013

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Cited by: 2 works
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