Longitudinal double-spin asymmetry for inclusive jet and dijet production in polarized proton collisions at root s=200 GeV

0543916 - ÚJF 2022 RIV US eng J - Journal Article
Abdallah, M. S. - Adam, J. - Adamczyk, L. - Adams, J. R. - Adkins, J. K. - Agakishiev, G. - Bielčík, J. - Bielčíková, Jana - Chaloupka, P. - Federič, Pavol - Holub, L. - Kosarzewski, L. K. - Líčeník, Robert - Ponimatkin, Georgij - Prozorova, V. - Robotková, Monika - Rusňák, Jan - Šimko, Miroslav - Šumbera, Michal - Truhlář, T. - Trzeciak, B. A. - Vaněk, Jan … Total 389 authors
Longitudinal double-spin asymmetry for inclusive jet and dijet production in polarized proton collisions at root s=200 GeV.
Physical Review D. Roč. 103, č. 9 (2021), č. článku L091103. ISSN 2470-0010. E-ISSN 2470-0029
R&D Projects: GA MŠMT LTT18002
Research Infrastructure: BNL-CZ II - 90109
Institutional support: RVO:61389005
Keywords : STAR collaboration * jet and dijet production * heavy ion experiment
OECD category: Particles and field physics
Impact factor: 5.407, year: 2021
Method of publishing: Open access
https://doi.org/10.1103/PhysRevD.103.L091103

We report high-precision measurements of the longitudinal double-spin asymmetry, A(LL), for midrapidity inclusive jet and dijet production in polarized pp collisions at a center-of-mass energy of root s = 200 GeV. The new inclusive jet data are sensitive to the gluon helicity distribution, Delta g(x, Q(2)), for gluon momentum fractions in the range from x similar or equal to 0.05 to x similar or equal to 0.5, while the new dijet data provide further constraints on the x dependence of Delta g(x, Q(2)). The results are in good agreement with previous measurements at root s = 200 GeV and with recent theoretical evaluations of prior world data. Our new results have better precision and thus strengthen the evidence that Delta g(x, Q(2)) is positive for x > 0.05.
Permanent Link: http://hdl.handle.net/11104/0321019