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

J/ψ polarization in p + p collisions at √s = 200 GeV in STAR (2013)

Authors:
USP affiliated authors: MUNHOZ, MARCELO GAMEIRO - IF ; SUAIDE, ALEXANDRE ALARCON DO PASSO - IF ; TOLEDO, ALEJANDRO SZANTO DE - IF
Unidade: IF
Assunto: COLISÕES DE ÍONS PESADOS RELATIVÍSTICOS
Language: Inglês
Abstract: 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
Imprenta:
- Publisher place: São Paulo
- Date published: 2013

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ABNT

ADAMCZYK, L; LIMA, Lucas Mafia de; MUNHOZ, Marcelo Gameiro; et al. J/ψ polarization in p + p collisions at √s = 200 GeV in STAR. [S.l: s.n.], 2013.
APA

Adamczyk, L., Lima, L. M. de, Munhoz, M. G., Oliveira, R. A. N. de, Souza, U. G. de, Suaide, A. A. do P., & Szanto de Toledo, A. (2013). J/ψ polarization in p + p collisions at √s = 200 GeV in STAR. São Paulo.
NLM

Adamczyk L, Lima LM de, Munhoz MG, Oliveira RAN de, Souza UG de, Suaide AA do P, Szanto de Toledo A. J/ψ polarization in p + p collisions at √s = 200 GeV in STAR. 2013 ;
Vancouver

Adamczyk L, Lima LM de, Munhoz MG, Oliveira RAN de, Souza UG de, Suaide AA do P, Szanto de Toledo A. J/ψ polarization in p + p collisions at √s = 200 GeV in STAR. 2013 ;