Measurement of the cross section and longitudinal double-spin asymmetry for dijet production in polarized pp collisions at root s=200 GeV

Ullrich, T; STAR Collaboration

Abstract

We report the first measurement of the longitudinal double-spin asymmetry A(LL) for midrapidity dijet production in polarized pp collisions at a center-of-mass energy of root s = 200 GeV. The dijet cross section was measured and is shown to be consistent with next-to-leading order (NLO) perturbative QCD predictions. A(LL) 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.

Más información

Título según WOS: ID WOS:000400254500001 Not found in local WOS DB
Título de la Revista: PHYSICAL REVIEW D
Volumen: 95
Número: 7
Editorial: AMER PHYSICAL SOC
Fecha de publicación: 2017
DOI:

10.1103/PhysRevD.95.071103

Notas: ISI