Transverse spin transfer to Λ and (Λ)over-bar hyperons in polarized proton-proton collisions at √<i>s</i>=200 GeV



Adam, J, Adamczyk, L, Adams, JR, Adkins, JK, Agakishiev, G, Aggarwal, MM, Ahammed, Z, Alekseev, I, Anderson, DM, Aoyama, R
et al (show 344 more authors) (2018) Transverse spin transfer to Λ and (Λ)over-bar hyperons in polarized proton-proton collisions at √<i>s</i>=200 GeV. PHYSICAL REVIEW D, 98 (9). 091103-.

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Abstract

The transverse spin transfer from polarized protons to $\Lambda$ and $\bar{\Lambda}$ hyperons is expected to provide sensitivity to the transversity distribution of the nucleon and to the transversely polarized fragmentation functions. We report the first measurement of the transverse spin transfer to $\Lambda$ and $\bar{\Lambda}$ along the polarization direction of the fragmenting quark, $D_\mathrm{TT}$, in transversely polarized proton-proton collisions at $\sqrt{s}=200\,\mathrm{GeV}$ with the STAR detector at RHIC. The data correspond to an integrated luminosity of $18\,\mathrm{pb}^{-1}$ and cover the pseudorapidity range $\left|\eta\right| < 1.2$ and transverse momenta $p_{\mathrm{T}}$ up to $8\,\mathrm{GeV}/c$. The dependence on $p_\mathrm{T}$ and $\eta$ are presented. The $D_\mathrm{TT}$ results are found to be comparable with a model prediction, and are also consistent with zero within uncertainties.

Item Type: Article
Additional Information: 8 pages, 4 figures, version to appear in Physical Review D
Uncontrolled Keywords: hep-ex, hep-ex
Depositing User: Symplectic Admin
Date Deposited: 10 May 2019 08:31
Last Modified: 11 Oct 2023 02:26
DOI: 10.1103/PhysRevD.98.091103
Open Access URL: https://doi.org/10.1103/PhysRevD.98.091103
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3040572