Longitudinal Spin Transfer to Lambda and Lambda bar Hyperons in Polarized Proton-Proton Collisions at sqrt s = 200 GeV

Journal Article · Mon Jul 05 04:00:00 EDT 2010 · Physical Review D

OSTI ID:986231

Abelev, Betty

The longitudinal spin transfer, D{sub LL}, from high energy polarized protons to {Lambda} and {bar {Lambda}} hypersons has been measured for the first time in proton-proton collisions at {radical}s = 200 GeV with the STAR detector at RHIC. The measurements cover pseudorapidity, {eta}, in the range |{eta}| < 1.2 and transverse momenta, p{sub T}, up to 4 GeV/c. The longitudinal spin transfer is found to be D{sub LL} = -0.03{+-}0.13(stat){+-}0.04(syst) for inclusive {Lambda} and D{sub LL} = -0.12{+-}0.08(stat){+-}0.03(syst) for inclusive {bar {Lambda}} hyperons with <{eta}> = 0.5 and <p{sub T}> = 3.7 GeV/c. The dependence on {eta} and p{sub T} is presented.

• Research Organization: Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
• Sponsoring Organization: Nuclear Science Division
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 986231
• Report Number(s): LBNL-3791E
• Journal Information: Physical Review D, Journal Name: Physical Review D; ISSN PRVDAQ; ISSN 1550-7998
• Country of Publication: United States
• Language: English

Related Subjects

111102
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
HYPERONS
POLARIZATION
PROTON-PROTON INTERACTIONS
PROTONS
SPIN