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

• Titel: Longitudinal and transverse spin transfer to Λ and ¯Λ hyperons in polarized p+p collisions at √???? = 200 GeV
• Mitwirkende: Abdulhamid, Muhammad Ibrahim [VerfasserIn]
• Mitwirkende: Deppner, Ingo Martin [VerfasserIn]
• Mitwirkende: Herrmann, Norbert [VerfasserIn]
• Mitwirkende: Leung, Yue [VerfasserIn]
• Mitwirkende: Söhngen, Yannick [VerfasserIn]
• Körperschaft: STAR Collaboration [VerfasserIn]
• E-Jahr: 2024
• Jahr: 5 January 2024
• Umfang: 15 S.
• Fussnoten: Im Titel steht der Buchstabe s unter dem Wurzelsymbol ; Gesehen am 11.10.2024
• Titel Quelle: Enthalten in: Physical review
• Ort Quelle: Ridge, NY : American Physical Society, 2016
• Jahr Quelle: 2024
• Band/Heft Quelle: 109(2024), 1 vom: Jan., Artikel-ID 012004, Seite 1-15
• ISSN Quelle: 2470-0029
• DOI: doi:10.1103/PhysRevD.109.012004
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1905431171

Abstract

The longitudinal and transverse spin transfers to Λ (¯Λ) 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, ????????⁢????, and the transverse spin transfer coefficient, ????????⁢????, to Λ and ¯Λ in polarized proton-proton collisions at √????=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 |????Λ⁡(¯Λ)|<1.2 and transverse momentum ????????,Λ⁡(¯Λ) up to 8 GeV/????. We also report the first measurements of the hyperon spin transfer coefficients ????????⁢???? and ????????⁢???? as a function of the fractional jet momentum ???? carried by the hyperon, which can provide more direct constraints on the polarized fragmentation functions.