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 - Journal Article
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. … Total 381 authors
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
Research Infrastructure: BNL-CZ III - 90234
Institutional support: RVO:61389005
Keywords : STAR collaboration * proton proton collisions * longitudinal spin
OECD category: Particles and field physics
Impact factor: 5, year: 2022
Method of publishing: 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.
Permanent Link: https://hdl.handle.net/11104/0352946