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

STAR Collaboration,; Adam, J.; Schmitz, N.; Seyboth, P.; et al.,

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

STAR Collaboration, Adam, J., Schmitz, N., Seyboth, P., & et al. (2018). Improved measurement of the longitudinal spin transfer to Λ and Λ¯ hyperons in polarized proton-proton collisions at sqrt{s} = 200 GeV. Physical Review D, (98), 112009. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2018-330.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0003-F8FD-9 Version Permalink: https://hdl.handle.net/21.11116/0000-0003-F8FE-8

Genre: Journal Article

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Creators:
STAR Collaboration¹, Author
Adam, J.¹, Author
Schmitz, N.¹, Author
Seyboth, P.¹, Author
et al.¹, Author

Affiliations:
1Max Planck Institute for Physics, Max Planck Society and Cooperation Partners, ou_2253650

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Free keywords: STAR

Abstract: The longitudinal spin transfer $D_{LL}$ to $Λ$ and $\barΛ$ hyperons produced in high-energy polarized proton--proton collisions is expected to be sensitive to the helicity distribution functions of strange quarks and anti-quarks of the proton, and to longitudinally polarized fragmentation functions. We report an improved measurement of $D_{LL}$ from data obtained at a center-of-mass energy of $\sqrt{s}$ = 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 pseudo-rapidity with transverse momenta $p_T$ up to 6 GeV/c. In the forward scattering hemisphere at largest $p_T$, the longitudinal spin transfer is found to be $D_{LL}$ = -0.036 $\pm$ 0.048 (stat) $\pm$ 0.013(sys) for $Λ$ hyperons and $D_{LL}$ = 0.032 $\pm$ 0.043\,(stat) $\pm$ 0.013\,(sys) for $\barΛ$ anti-hyperons. The dependences on $η$ and $p_T$ are presented and compared with model evaluations.

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Dates: Date issued: 2018

Publication Status: Issued

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Identifiers: eDoc: 747288
URI: https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2018-330
URI: http://arXiv.org/abs/arxiv:1808.07634
URI: https://inspirehep.net/search?p=find+eprint+1808.07634
Other: MPP-2018-330

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Title: Physical Review D

Alternative Title : Phys.Rev.D

Source Genre: Journal

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Pages: - Volume / Issue: (98) Sequence Number: - Start / End Page: 112009 Identifier: -