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• W2912471899 abstract "The longitudinal spin transfer DLL to Λ and Λ¯ hyperons produced in high-energy polarized proton-proton collisions is expected to be sensitive to the helicity distribution functions of strange quarks and antiquarks of the proton, and to longitudinally polarized fragmentation functions. We report an improved measurement of DLL from data obtained at a center-of-mass energy of s=200 GeV with the STAR detector at RHIC. The data have an approximately twelve times larger figure of merit than prior results and cover |η|<1.2 in pseudorapidity with transverse momenta pT up to 6 GeV/c. In the forward scattering hemisphere at largest pT, the longitudinal spin transfer is found to be DLL=−0.036±0.048(stat)±0.013(sys) for Λ hyperons and DLL=0.032±0.043(stat)±0.013(sys) for Λ¯ antihyperons. The dependences on η and pT are presented and compared with model evaluations.Received 23 August 2018DOI:https://doi.org/10.1103/PhysRevD.98.112009Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasHadron-hadron interactionsPhysical SystemsHyperonsStrange quarkPropertiesSpinParticles & FieldsNuclear Physics" @default.
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• W2912471899 date "2018-12-20" @default.
• W2912471899 modified "2023-10-14" @default.
• W2912471899 title "Improved measurement of the longitudinal spin transfer to <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi mathvariant=normal>Λ</mml:mi></mml:math> and <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mover accent=true><mml:mi mathvariant=normal>Λ</mml:mi><mml:mo stretchy=false>¯</mml:mo></mml:mover></mml:math> hyperons in polarized proton-proton collisions at <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display…" @default.
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