MEASUREMENTS OF LAMBA AND ANTI-LAMBDA POLARIZATION IN LONGITUDINALLY POLARIZED PROTON-PROTON COLLISIONS AT SQRT S(NN) = 200 GEV AT STAR.

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Preliminary results for the longitudinal polarization of A and hyperons in longitudinally polarized proton-proton collisions at {radical}s = 200 GeV are presented. The {Lambda}({bar {Lambda}}) candidates are reconstructed at mid-rapidity (|{eta}| < 1) with the time projection chamber of the STAR experiment at RHIC, using 0.5 pb{sup -1} collected in 2003 and 2004 with beam polarizations of up to 45%. Their mean longitudinal momentum fraction x{sub F} is about 8 x 10{sup -3} and their mean transverse momentum p{sub T} is about 1.5 GeV. The analysis uses asymmetries of counts for different spin states of the colliding proton beams and ... continued below

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3 pages

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XU, Q. (FOR THE STAR COLLABORATION) October 24, 2005.

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Preliminary results for the longitudinal polarization of A and hyperons in longitudinally polarized proton-proton collisions at {radical}s = 200 GeV are presented. The {Lambda}({bar {Lambda}}) candidates are reconstructed at mid-rapidity (|{eta}| < 1) with the time projection chamber of the STAR experiment at RHIC, using 0.5 pb{sup -1} collected in 2003 and 2004 with beam polarizations of up to 45%. Their mean longitudinal momentum fraction x{sub F} is about 8 x 10{sup -3} and their mean transverse momentum p{sub T} is about 1.5 GeV. The analysis uses asymmetries of counts for different spin states of the colliding proton beams and does not require detailed knowledge of the detector acceptance. The preliminary {Lambda}({Lambda}) polarization values are consistent with zero within their statistical uncertainties of 0.05.

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3 pages

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  • PARTICLES AND NUCLEI INTERNATIONAL CONFERENCE (PANIC 05); SANTE FE, NEW MEXICO; 20051024 through 20051028

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  • Report No.: BNL--75436-2006-CP
  • Grant Number: DE-AC02-98CH10886
  • Office of Scientific & Technical Information Report Number: 876638
  • Archival Resource Key: ark:/67531/metadc877804

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  • October 24, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 12, 2016, 8:17 p.m.

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XU, Q. (FOR THE STAR COLLABORATION). MEASUREMENTS OF LAMBA AND ANTI-LAMBDA POLARIZATION IN LONGITUDINALLY POLARIZED PROTON-PROTON COLLISIONS AT SQRT S(NN) = 200 GEV AT STAR., article, October 24, 2005; (digital.library.unt.edu/ark:/67531/metadc877804/: accessed May 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.