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

STAR Collaboration

doi:10.1016/j.physletb.2014.10.049

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

STAR Collaboration

AGH University of Krakow
University of Kentucky
Joint Institute for Nuclear Research
Panjab University
SUBATECH
Brookhaven National Laboratory
Variable Energy Cyclotron Centre
Alikhanov Institute for Theoretical and Experimental Physics
Kent State University
Ohio State University
Massachusetts Institute of Technology
Czech Academy of Sciences
University of Houston
University of Jammu
University of Texas at Austin
University of Washington
Czech Technical University in Prague
Moscow Engineering Physics Institute
University of California at Davis
Old Dominion University
Rice University
Yale University
Pennsylvania State University
Texas A&M University
University of Science and Technology of China
Chinese Academy of Sciences
Central China Normal University
Tsinghua University
Creighton University
Cracow University of Technology
University of California at Berkeley
Institute of Physics
Shandong University
Institute for High Energy Physics
Universidade Estadual de Campinas
Indiana University Bloomington
Lawrence Berkeley National Laboratory
Valparaiso University
Institute of Modern Physics
University of California at Los Angeles
United States Naval Academy
University of Illinois at Chicago
Purdue University
Warsaw University of Technology
Argonne National Laboratory
National Institute of Science Education and Research
Korea Institute of Science and Technology Information
Goethe University Frankfurt
Temple University
Universidade de São Paulo
Indian Institute of Technology Bombay
University of Birmingham
Michigan State University
Pusan National University
Institute of Nuclear Physics PAN
University of Zagreb
University of Rajasthan
Max Planck Institute for Physics (Werner Heisenberg Institute)

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

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.

Original language	English
Pages (from-to)	180-188
Number of pages	9
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	739
DOIs	https://doi.org/10.1016/j.physletb.2014.10.049
State	Published - 2 Dec 2014
Externally published	Yes

Keywords

Charmonia
Polarization
RHIC
STAR
Spin alignment

Access to Document

10.1016/j.physletb.2014.10.049

Cite this

@article{368980f347f54789a8ac5f9dab1c1c8e,

title = "J/ψ polarization in p+p collisions at s=200 GeV in STAR",

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.",

keywords = "Charmonia, Polarization, RHIC, STAR, Spin alignment",

author = "L. Adamczyk and Adkins, \{J. K.\} and G. Agakishiev and Aggarwal, \{M. M.\} and S. Kabana and \{STAR Collaboration\}",

note = "Publisher Copyright: {\textcopyright} 2014 The Authors.",

year = "2014",

month = dec,

day = "2",

doi = "10.1016/j.physletb.2014.10.049",

language = "English",

volume = "739",

pages = "180--188",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

}

TY - JOUR

T1 - J/ψ polarization in p+p collisions at s=200 GeV in STAR

AU - Adamczyk, L.

AU - Adkins, J. K.

AU - Agakishiev, G.

AU - Aggarwal, M. M.

AU - Kabana, S.

AU - STAR Collaboration

PY - 2014/12/2

Y1 - 2014/12/2

N2 - 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.

AB - 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.

KW - Charmonia

KW - Polarization

KW - RHIC

KW - STAR

KW - Spin alignment

UR - https://www.scopus.com/pages/publications/84910092408

U2 - 10.1016/j.physletb.2014.10.049

DO - 10.1016/j.physletb.2014.10.049

M3 - Article

AN - SCOPUS:84910092408

SN - 0370-2693

VL - 739

SP - 180

EP - 188

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

ER -

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

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this