SPIN EFFECTS IN LARGE RAPIDITY NEUTRAL PION PRODUCTION AT STAR.

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Measurements by the STAR collaboration of neutral pion production at large Feynman x (x{sub F}) in the first polarized proton collisions at {radical}s = 200 GeV were reported previously. During the following two runs additional statistics were acquired with an improved forward calorimeter for the {pi}{sup 0} cross-section and analyzing power measurements. First data from pp collisions at {radical}s = 410 GeV were taken during the RHIC run that ended in June, 2005. The cross section was measured at {eta} = 3.3, 3.8 and 4.0 and was found to be consistent with next-to-leading order perturbative QCD calculations. The analyzing power ... continued below

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6 pages

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MOROZOV, D.A. (FOR THE STAR COLLABORATION) September 27, 2005.

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Measurements by the STAR collaboration of neutral pion production at large Feynman x (x{sub F}) in the first polarized proton collisions at {radical}s = 200 GeV were reported previously. During the following two runs additional statistics were acquired with an improved forward calorimeter for the {pi}{sup 0} cross-section and analyzing power measurements. First data from pp collisions at {radical}s = 410 GeV were taken during the RHIC run that ended in June, 2005. The cross section was measured at {eta} = 3.3, 3.8 and 4.0 and was found to be consistent with next-to-leading order perturbative QCD calculations. The analyzing power was found to be zero at negative 23 and at positive x{sub F} up to 0.3, then increased with increasing x{sub F}. This behavior can be described by phenomenological models including the Sivers effect, the Collins effect or higher twist contributions in initial and final states. Results for the analyzing power at {eta} = 3.7 and 4.0 from all data acquired at {radical}s = 200 GeV and the status of the analysis of the {radical}s = 410 GeV data will be presented. Future upgrade plans and status will also be discussed.

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6 pages

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  • 11TH INTERNATIONAL WORKSHOP ON HIGH ENERGY SPIN PHYSICS (DUBNA-SPIN-05); DUBNA, RUSSA; 20050927 through 20051001

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  • Report No.: BNL--75443-2006-CP
  • Grant Number: DE-AC02-98CH10886
  • Office of Scientific & Technical Information Report Number: 876641
  • Archival Resource Key: ark:/67531/metadc874344

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  • September 27, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 12, 2016, 8:22 p.m.

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MOROZOV, D.A. (FOR THE STAR COLLABORATION). SPIN EFFECTS IN LARGE RAPIDITY NEUTRAL PION PRODUCTION AT STAR., article, September 27, 2005; (digital.library.unt.edu/ark:/67531/metadc874344/: accessed July 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.