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Measurement of transverse-single-spin asymmetries for midrapidity and forward-rapidity production of hadrons in polarized p+p collisions at √ s = 200 and 62.4 GeV

A Adare Olácio Dietzsch; Marisílvia Donadelli; Marco Aurelio Lisboa Leite; Bruno Rodrigues Lenzi; Cesar Luiz da Silva; E. M Takagui (Emi Marcia)

São Paulo 2013

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  • Título:
    Measurement of transverse-single-spin asymmetries for midrapidity and forward-rapidity production of hadrons in polarized p+p collisions at √ s = 200 and 62.4 GeV
  • Autor: A Adare
  • Olácio Dietzsch; Marisílvia Donadelli; Marco Aurelio Lisboa Leite; Bruno Rodrigues Lenzi; Cesar Luiz da Silva; E. M Takagui (Emi Marcia)
  • Assuntos: COLISÕES DE ÍONS PESADOS RELATIVÍSTICOS
  • Notas: arXiv.1312.1995
  • Descrição: Measurements of transverse-single-spin asymmetries (AN) in p+p collisions at √ s = 62.4 and 200 GeV with the PHENIX detector at RHIC are presented. At midrapidity, AN is measured for neutral pion and eta mesons reconstructed from diphoton decay, and, at forward rapidities, neutral pions are measured using both diphotons and electromagnetic clusters. The neutral-pion measurement of AN at midrapidity is consistent with zero with uncertainties a factor of 20 smaller than previous publications, which will lead to improved constraints on the gluon Sivers function. At higher rapidities, where the valence quark distributions are probed, the data exhibit sizable asymmetries. In comparison with previous measurements in this kinematic region, the new data extend the kinematic coverage in √ s and pT , and it is found that the asymmetries depend only weakly on √ s. The origin of the forward AN is presently not understood quantitatively. The extended reach to higher pT probes the transition between transverse momentum dependent effects at low pT and multi-parton dynamics at high pT.
  • Editor: São Paulo
  • Data de criação/publicação: 2013
  • Formato: 16 p.
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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