Longitudinal spin transfer to Λ and Λ̄ hyperons in polarized proton-proton collisions at s=200GeV

Academic Article


  • The longitudinal spin transfer, DLL, from high energy polarized protons to Λ and Λ̄ hyperons has been measured for the first time in proton-proton collisions at s=200GeV with the STAR detector at the Relativistic Heavy Ion Collider. The measurements cover pseudorapidity, η, in the range |η|<1.2 and transverse momenta, pT, up to 4GeV/c. The longitudinal spin transfer is found to be DLL=-0.03±0.13(stat)±0.04(syst) for inclusive Λ and DLL=-0.12±0.08(stat)±0.03(syst) for inclusive Λ̄ hyperons with η =0.5 and pT=3.7GeV/c. The dependence on η and pT is presented. © 2009 The American Physical Society.
  • Authors

    Digital Object Identifier (doi)

    Author List

  • Abelev BI; Aggarwal MM; Ahammed Z; Alakhverdyants AV; Anderson BD; Arkhipkin D; Averichev GS; Balewski J; Barannikova O; Barnby LS
  • Volume

  • 80
  • Issue

  • 11