Longitudinal and transverse spin transfer to Λ and ¯Λ hyperons in polarized p+p collisions at √s = 200 GeV

0585202 - ÚJF 2025 RIV US eng J - Článek v odborném periodiku
Abdulhamid, M. I. - Aboona, B. E. - Adam, J. - Adamczyk, L. - Bielčík, J. - Bielčíková, Jana - Češka, J. - Chaloupka, P. - Das, A. - Holub, L. - Kramárik, L. - Líčeník, Robert - Lomnický, O. - Prozorova, V. - Robotková, Monika - Šumbera, Michal - Truhlář, T. - Trzeciak, B. A. … celkem 381 autorů
Longitudinal and transverse spin transfer to Λ and ¯Λ hyperons in polarized p+p collisions at √s = 200 GeV.
Physical Review D. Roč. 109, č. 1 (2024), č. článku 012004. ISSN 2470-0010. E-ISSN 2470-0029
Výzkumná infrastruktura: BNL-CZ III - 90234
Institucionální podpora: RVO:61389005
Klíčová slova: STAR collaboration * proton proton collisions * longitudinal spin
Obor OECD: Particles and field physics
Impakt faktor: 5, rok: 2022
Způsob publikování: Open access
https://doi.org/10.1103/PhysRevD.109.012004

The longitudinal and transverse spin transfers to Lambda (Lambda) hyperons in polarized proton-proton collisions are expected to be sensitive to the helicity and transversity distributions, respectively, of (anti)strange quarks in the proton, and to the corresponding polarized fragmentation functions. We report improved measurements of the longitudinal spin transfer coefficient, D-LL, and the transverse spin transfer coefficient, D-TT,D- to Lambda and Lambda in polarized proton-proton collisions at root s=200 GeV by the STAR experiment at RHIC. The dataset includes longitudinally polarized proton-proton collisions with an integrated luminosity of 52 pb(-1), and transversely polarized proton-proton collisions with a similar integrated luminosity. Both datasets have about twice the statistics of previous results and cover a kinematic range of |eta(Lambda (Lambda))|<1.2 and transverse momentum p(T,Lambda( (Lambda)) up to 8 GeV/c. We also report the first measurements of the hyperon spin transfer coefficients D-LL and D-TT as a function of the fractional jet momentum z carried by the hyperon, which can provide more direct constraints on the polarized fragmentation functions.
Trvalý link: https://hdl.handle.net/11104/0352946