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Neutral pion cross section and spin asymmetries at intermediate pseudorapidity in polarized proton collisions at √ s = 200 GeV

L Adamczyk Lucas Mafia de Lima; Marcelo Gameiro Munhoz; Renato Aparecido Negrão de Oliveira; Ulisses Gulart de Souza; Alexandre Alarcon do Passo Suaide; Alejandro Szanto de Toledo

São Paulo 2013

Acesso online

  • Título:
    Neutral pion cross section and spin asymmetries at intermediate pseudorapidity in polarized proton collisions at √ s = 200 GeV
  • Autor: L Adamczyk
  • Lucas Mafia de Lima; Marcelo Gameiro Munhoz; Renato Aparecido Negrão de Oliveira; Ulisses Gulart de Souza; Alexandre Alarcon do Passo Suaide; Alejandro Szanto de Toledo
  • Assuntos: COLISÕES DE ÍONS PESADOS RELATIVÍSTICOS
  • Notas: arXiv.1309.1800
  • Descrição: The differential cross section and spin asymmetries for neutral pions produced within the intermediate pseudorapidity range 0.8 < η < 2.0 in polarized proton-proton collisions at √ s = 200 GeVare presented. Neutral pions were detected using the endcap electromagnetic calorimeter in the STAR detector at RHIC. The cross section was measured over a transverse momentum range of 5 < pT < 16 GeV/c and is found to agree with a next-to-leading order perturbative QCD calculation. The longitudinal double-spin asymmetry, ALL, is measured in the same pseudorapidity range and spans a range of Bjorken-x down to x ≈ 0.01. The measured ALL is consistent with model predictions for varying degrees of gluon polarization. The parity-violating asymmetry, AL, is also measured and found to be consistent with zero. The transverse single-spin asymmetry, AN, is measured over a previously unexplored kinematic range in Feynman-x and pT . Such measurements may aid our understanding of the on-set and kinematic dependence of the large asymmetries observed at more forward pseudorapidity (η ≈ 3) and their underlying mechanisms. The AN results presented are consistent with a twist-3 model prediction of a small asymmetry over the present kinematic range.
  • Editor: São Paulo
  • Data de criação/publicação: 2013
  • Formato: 11 p.
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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