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

Adamczyk, L. and Planinić, Mirko and Poljak, Nikola and Zyzak, M. (STAR Collaboration) (2014) J/ψ polarization in p + p collisions at √s = 200 GeV in STAR. Physics Letters B, 739. pp. 180-188. ISSN 0370-2693

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Abstract

We report on a polarization measurement of inclusive J/ψ m√esons 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.

Item Type: Article
Keywords: J/Psi, polarization, STAR
Date: 12 December 2014
Subjects: NATURAL SCIENCES > Physics
Additional Information: © 2014 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/3.0/). Funded by SCOAP3. Received 8 November 2013. Received in revised form 7 October 2014. Accepted 22 October 2014. Available online 30 October 2014.
Divisions: Faculty of Science > Department of Physics
Publisher: Elsevier
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 10 Apr 2015 08:24
Last Modified: 29 May 2016 20:35
URI: http://digre.pmf.unizg.hr/id/eprint/3799

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