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J/ψ polarization in p + p collisions at √s = 200 GeV in STAR

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:
    J/ψ polarization in p + p collisions at √s = 200 GeV in STAR
  • 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.1311.1621
  • Descrição: We report on a polarization measurement of inclusive J/ψ mesons in the di-electron decay channel at mid-rapidity at 2 < pT < 6 GeV/c in p + p collisions at √ s = 200 GeV. Data were taken with the STAR detector at RHIC. The J/ψ polarization measurement should help to distinguish between the different models of the J/ψ production mechanism since they predict different pT dependences of the J/ψ polarization. In this analysis, J/ψ polarization is studied in the helicity frame. The polarization parameter λθ measured at RHIC becomes smaller towards high pT , indicating more longitudinal J/ψ polarization as pT increases. The result is compared with predictions of presently available models
  • Editor: São Paulo
  • Data de criação/publicação: 2013
  • Formato: 9 p.
  • Idioma: Inglês

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