Measurement of the cross section and longitudinal double-spin asymmetry for dijet production in polarized collisions at
Journal Article
·
· Physical Review. D.
We report the first measurement of the longitudinal double-spin asymmetry ALL for midrapidity dijet production in polarized pp collisions at a center-of-mass energy of s=200 GeV. The dijet cross section was measured and is shown to be consistent with next-to-leading order (NLO) perturbative QCD predictions. ALL results are presented for two distinct topologies, defined by the jet pseudorapidities, and are compared to predictions from several recent NLO global analyses. The measured asymmetries, the first such correlation measurements, support those analyses that find positive gluon polarization at the level of roughly 0.2 over the region of Bjorken-x > 0.05.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States). Relativistic Heavy Ion Collider (RHIC); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- Contributing Organization:
- STAR Collaboration
- Grant/Contract Number:
- SC0012704; AC02-05CH11231
- OSTI ID:
- 1376086
- Alternate ID(s):
- OSTI ID: 1353508; OSTI ID: 1379793; OSTI ID: 1430679
- Report Number(s):
- BNL-113848-2017-JA; PRVDAQ; R&D Project: PO 004; KB0202012
- Journal Information:
- Physical Review. D., Vol. 95, Issue 7; ISSN 2470-0010
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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