TY - JOUR
T1 - Longitudinal double-spin asymmetry for inclusive jet and dijet production in polarized proton collisions at s =200 GeV
AU - Abdallah, M. S.
AU - Adam, J.
AU - Adamczyk, L.
AU - Adams, J. R.
AU - Kabana, S.
AU - (STAR Collaboration)
N1 - Publisher Copyright:
© 2021 authors. Published by the American Physical Society.
PY - 2021/5/1
Y1 - 2021/5/1
N2 - We report high-precision measurements of the longitudinal double-spin asymmetry, ALL, for midrapidity inclusive jet and dijet production in polarized pp collisions at a center-of-mass energy of s=200 GeV. The new inclusive jet data are sensitive to the gluon helicity distribution, Δg(x,Q2), for gluon momentum fractions in the range from x≃0.05 to x≃0.5, while the new dijet data provide further constraints on the x dependence of Δg(x,Q2). The results are in good agreement with previous measurements at s=200 GeV and with recent theoretical evaluations of prior world data. Our new results have better precision and thus strengthen the evidence that Δg(x,Q2) is positive for x>0.05.
AB - We report high-precision measurements of the longitudinal double-spin asymmetry, ALL, for midrapidity inclusive jet and dijet production in polarized pp collisions at a center-of-mass energy of s=200 GeV. The new inclusive jet data are sensitive to the gluon helicity distribution, Δg(x,Q2), for gluon momentum fractions in the range from x≃0.05 to x≃0.5, while the new dijet data provide further constraints on the x dependence of Δg(x,Q2). The results are in good agreement with previous measurements at s=200 GeV and with recent theoretical evaluations of prior world data. Our new results have better precision and thus strengthen the evidence that Δg(x,Q2) is positive for x>0.05.
UR - https://www.scopus.com/pages/publications/85107373402
U2 - 10.1103/PhysRevD.103.L091103
DO - 10.1103/PhysRevD.103.L091103
M3 - Article
AN - SCOPUS:85107373402
SN - 2470-0010
VL - 103
JO - Physical Review D
JF - Physical Review D
IS - 9
M1 - L091103
ER -