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Longitudinal Spin Transfer to Λ and [¯ over Λ] Hyperons in Polarized Proton-Proton Collisions at √s = 200 GeV

Author(s)
Balewski, Jan T.; Betancourt, Michael Joseph; Corliss, Ross Cameron; Hays-Wehle, James Prewitt; Hoffman, Alan Michael; Jones, Christopher LaDon; Kocoloski, Adam Philip; Leight, William Axel; Milner, Richard G; Redwine, Robert P; Sakuma, Tai; Seele, Joseph Patrick; Surrow, Bernd; van Nieuwenhuizen, Gerrit J; Walker, Matthew H; ... Show more Show less
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Abstract
The longitudinal spin transfer, D[subscript LL], from high energy polarized protons to Λ and [bar over Λ] hyperons has been measured for the first time in proton-proton collisions at √s=200 GeV with the STAR detector at the Relativistic Heavy Ion Collider. The measurements cover pseudorapidity, η, in the range |η| < 1.2 and transverse momenta, p[subscript T], up to 4 GeV/c. The longitudinal spin transfer is found to be D[subscript LL]=-0.03±0.13(stat)±0.04(syst) for inclusive Λ and D[subscript LL]=-0.12±0.08(stat)±0.03(syst) for inclusive [bar over Λ] hyperons with η =0.5 and pT=3.7GeV/c. The dependence on η and p[subscript T] is presented. © 2009 The American Physical Society.
Date issued
2009-12
URI
http://hdl.handle.net/1721.1/117177
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical Review D
Publisher
American Physical Society (APS)
Citation
Abelev, B. I., et al. “Longitudinal Spin Transfer to Λ and [¯ over Λ] Hyperons in Polarized Proton-Proton Collisions at √s = 200 GeV.” Physical Review D, vol. 80, no. 11, Dec. 2009. © 2009 American Physical Society
Version: Final published version
ISSN
1550-7998
1550-2368

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