Longitudinal spin transfer in inclusive Lambda and Lambda barproduct ion in polarized proton-proton collisions at sqrt s = 200GeV

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This contribution reports on a proof-of-principle measurement of the longitudinal spin transfer D{sub LL} in inclusive {Lambda} and {Lambda} production in polarized proton-proton collisions at a center of mass energy {radical}s = 200 GeV. The data sample consists of about 3 x 10{sup 6} minimum bias events collected in the year 2005 by the STAR experiment at RHIC with proton beam polarizations of up to 50%. The {Lambda}({bar {Lambda}}) candidates are reconstructed at mid-rapidity (|{eta}| < 1) using the STAR Time Projection Chamber via the dominant decay channel {Lambda} {yields} p{pi}{sup -} ({Lambda} {yields} {bar p}{pi}{sup +}). Their mean transverse ... continued below

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Xu, Qinghua & Collaboration, STAR October 1, 2006.

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This contribution reports on a proof-of-principle measurement of the longitudinal spin transfer D{sub LL} in inclusive {Lambda} and {Lambda} production in polarized proton-proton collisions at a center of mass energy {radical}s = 200 GeV. The data sample consists of about 3 x 10{sup 6} minimum bias events collected in the year 2005 by the STAR experiment at RHIC with proton beam polarizations of up to 50%. The {Lambda}({bar {Lambda}}) candidates are reconstructed at mid-rapidity (|{eta}| < 1) using the STAR Time Projection Chamber via the dominant decay channel {Lambda} {yields} p{pi}{sup -} ({Lambda} {yields} {bar p}{pi}{sup +}). Their mean transverse momentum p{sub T} is about 1.3 GeV/c and longitudinal momentum fraction x{sub F} = 7.5 x 10{sup -3}. The longitudinal {Lambda}({bar {Lambda}}) polarization is determined using a method in which the detector acceptance mostly cancels.

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  • 17th International Spin Physics Symposium, Kyoto,Japan, 10/2-7/2006

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  • Report No.: LBNL--62052
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 902029
  • Archival Resource Key: ark:/67531/metadc885781

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  • October 1, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Sept. 30, 2016, 1:58 p.m.

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Xu, Qinghua & Collaboration, STAR. Longitudinal spin transfer in inclusive Lambda and Lambda barproduct ion in polarized proton-proton collisions at sqrt s = 200GeV, article, October 1, 2006; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc885781/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.