Transverse spin transfer to Λ and Λbar hyperons in polarized proton-proton collisions at sqrt(s) = 200 GeV
Physical Review D
The transverse spin transfer from polarized protons to Λ and Λ¯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 Λ and Λ¯ along the polarization direction of the fragmenting quark, DTT, in transversely polarized proton-proton collisions at s√=200GeV with the STAR detector at RHIC. The data correspond to an integrated luminosity of 18pb−1 and cover the pseudorapidity range |η|<1.2and transverse momenta pT up to 8GeV/c. The dependence on pTand η are presented. The DTT results are found to be comparable with a model prediction, and are also consistent with zero within uncertainties.
Gibson, Adam; Stanislaus, Shirvel; Koetke, Donald; and STAR Collaboration, "Transverse spin transfer to Λ and Λbar hyperons in polarized proton-proton collisions at sqrt(s) = 200 GeV" (2018). Physics and Astronomy Faculty Publications. 179.