Longitudinal double-spin asymmetries for π0S in the forward direction for 510 GeV polarized pp collisions

• Verfasst von: Adam, Jaroslav [VerfasserIn]
• Verfasst von: Deppner, Ingo Martin [VerfasserIn]
• Verfasst von: Herrmann, Norbert [VerfasserIn]
• Titel: Longitudinal double-spin asymmetries for π0S in the forward direction for 510 GeV polarized pp collisions
• Körperschaft: STAR Collaboration [VerfasserIn]
• Verf.angabe: J. Adam, I.M. Deppner, N. Herrmann [und 346 weitere] (STAR Collaboration)
• E-Jahr: 2018
• Jahr: 27 August 2018
• Umfang: 7 S.
• Fussnoten: Gesehen am 05.07.2019
• Titel Quelle: Enthalten in: Physical review
• Ort Quelle: Woodbury, NY : Inst., 2016
• Jahr Quelle: 2018
• Band/Heft Quelle: 98(2018,3) Artikel-Nummer 032013, 7 Seiten
• ISSN Quelle: 2470-0029
• DOI: doi:10.1103/PhysRevD.98.032013
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1668664682

Abstract

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.