Measurement of transverse spin effects with the forward pion detector at STAR in polarized p+p collisions at 200GeV

Research output: Contribution to conferencePaper

Abstract

The STAR collaboration presents preliminary measurements of AN, the transverse single spin asymmetries in p + p → π0 + X interactions at √s = 200GeV/c with rapidity in the range from 3.3 to 3.7. The data were collected with the STAR FPD and FPD++ detectors during RHIC Run 6. With this much larger data set than that of earlier RHIC runs, a determination of the transverse momentum (pT) dependence of AN for narrow bins of the Feynman XF out to pT > 3GeV/c is presented. While all the current theories predict that the asymmetry at fixed XF should fall with pT, this experimental measurement shows no reduction in asymmetry as a function of pT. These asymmetries correspond to production in a regime where NLO PQCD calculations can successfully describe the spin summed cross sections.

Original languageEnglish (US)
StatePublished - Dec 1 2007
Event15th International Workshop on Deep-Inelastic Scattering and Related Subjects, DIS 2007 - Munich, Germany
Duration: Apr 16 2007Apr 20 2007

Other

Other15th International Workshop on Deep-Inelastic Scattering and Related Subjects, DIS 2007
CountryGermany
CityMunich
Period4/16/074/20/07

Fingerprint

pions
asymmetry
collisions
detectors
transverse momentum
cross sections
interactions

All Science Journal Classification (ASJC) codes

  • Radiation

Cite this

Heppelmann, S. (2007). Measurement of transverse spin effects with the forward pion detector at STAR in polarized p+p collisions at 200GeV. Paper presented at 15th International Workshop on Deep-Inelastic Scattering and Related Subjects, DIS 2007, Munich, Germany.
Heppelmann, Steven. / Measurement of transverse spin effects with the forward pion detector at STAR in polarized p+p collisions at 200GeV. Paper presented at 15th International Workshop on Deep-Inelastic Scattering and Related Subjects, DIS 2007, Munich, Germany.
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Heppelmann, S 2007, 'Measurement of transverse spin effects with the forward pion detector at STAR in polarized p+p collisions at 200GeV', Paper presented at 15th International Workshop on Deep-Inelastic Scattering and Related Subjects, DIS 2007, Munich, Germany, 4/16/07 - 4/20/07.

Measurement of transverse spin effects with the forward pion detector at STAR in polarized p+p collisions at 200GeV. / Heppelmann, Steven.

2007. Paper presented at 15th International Workshop on Deep-Inelastic Scattering and Related Subjects, DIS 2007, Munich, Germany.

Research output: Contribution to conferencePaper

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AB - The STAR collaboration presents preliminary measurements of AN, the transverse single spin asymmetries in p + p → π0 + X interactions at √s = 200GeV/c with rapidity in the range from 3.3 to 3.7. The data were collected with the STAR FPD and FPD++ detectors during RHIC Run 6. With this much larger data set than that of earlier RHIC runs, a determination of the transverse momentum (pT) dependence of AN for narrow bins of the Feynman XF out to pT > 3GeV/c is presented. While all the current theories predict that the asymmetry at fixed XF should fall with pT, this experimental measurement shows no reduction in asymmetry as a function of pT. These asymmetries correspond to production in a regime where NLO PQCD calculations can successfully describe the spin summed cross sections.

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Heppelmann S. Measurement of transverse spin effects with the forward pion detector at STAR in polarized p+p collisions at 200GeV. 2007. Paper presented at 15th International Workshop on Deep-Inelastic Scattering and Related Subjects, DIS 2007, Munich, Germany.