• Open Access

Improved measurement of the longitudinal spin transfer to Λ and Λ¯ hyperons in polarized proton-proton collisions at s=200GeV

J. Adam et al. (STAR Collaboration)
Phys. Rev. D 98, 112009 – Published 20 December 2018

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=200GeV 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 6GeV/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.

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  • Received 23 August 2018

DOI:https://doi.org/10.1103/PhysRevD.98.112009

Published 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 Society

Physics Subject Headings (PhySH)

  1. Physical Systems
  1. Properties
Particles & FieldsNuclear Physics

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Vol. 98, Iss. 11 — 1 December 2018

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