Measurement of inclusive J/ψ polarization in p+p collisions at s =200 GeV by the STAR experiment

(STAR Collaboration)

doi:10.1103/PhysRevD.102.092009

Measurement of inclusive J/ψ polarization in p+p collisions at s =200 GeV by the STAR experiment

(STAR Collaboration)

Brookhaven National Laboratory
AGH University of Krakow
Ohio State University
University of Kentucky
Joint Institute for Nuclear Research
Panjab University
Variable Energy Cyclotron Centre India
Russian Research Centre Kurchatov Institute
Moscow Engineering Physics Institute
Texas A&M University
Central China Normal University
Kent State University
Indian Institute of Science Education and Research, Berhampur
University of California at Riverside
Stony Brook University
University of Houston
University of Jammu
Czech Technical University in Prague
Czech Academy of Sciences
Shandong University
Old Dominion University
Rice University
Yale University
University of California at Davis
University of California at Los Angeles
National Cheng Kung University
Fudan University
University of Science and Technology of China
Tsinghua University
Creighton University

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16 Scopus citations

Abstract

We report on new measurements of inclusive J/ψ polarization at midrapidity in p+p collisions at s=200 GeV by the STAR experiment at the Relativistic Heavy Ion Collider. The polarization parameters, λθ, λφ, and λθφ, are measured as a function of transverse momentum (pT) in both the helicity and Collins-Soper (CS) reference frames within pT<10 GeV/c. Except for λθ in the CS frame at the highest measured pT, all three polarization parameters are consistent with 0 in both reference frames without any strong pT dependence. Several model calculations are compared with data, and the one using the Color Glass Condensate effective field theory coupled with nonrelativistic QCD gives the best overall description of the experimental results, even though other models cannot be ruled out due to experimental uncertainties.

Original language	English
Article number	092009
Journal	Physical Review D
Volume	102
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevD.102.092009
State	Published - Nov 20 2020

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10.1103/PhysRevD.102.092009

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@article{d51382b4bb1d4ac288f6a00de8aa2f60,

title = "Measurement of inclusive J/ψ polarization in p+p collisions at s =200 GeV by the STAR experiment",

abstract = "We report on new measurements of inclusive J/ψ polarization at midrapidity in p+p collisions at s=200 GeV by the STAR experiment at the Relativistic Heavy Ion Collider. The polarization parameters, λθ, λφ, and λθφ, are measured as a function of transverse momentum (pT) in both the helicity and Collins-Soper (CS) reference frames within pT<10 GeV/c. Except for λθ in the CS frame at the highest measured pT, all three polarization parameters are consistent with 0 in both reference frames without any strong pT dependence. Several model calculations are compared with data, and the one using the Color Glass Condensate effective field theory coupled with nonrelativistic QCD gives the best overall description of the experimental results, even though other models cannot be ruled out due to experimental uncertainties.",

author = "\{(STAR Collaboration)\} and J. Adam and L. Adamczyk and Adams, \{J. R.\} and Adkins, \{J. K.\} and G. Agakishiev and Aggarwal, \{M. M.\} and Z. Ahammed and I. Alekseev and Anderson, \{D. M.\} and A. Aparin and Aschenauer, \{E. C.\} and Ashraf, \{M. U.\} and Atetalla, \{F. G.\} and A. Attri and Averichev, \{G. S.\} and V. Bairathi and K. Barish and A. Behera and R. Bellwied and A. Bhasin and J. Bielcik and J. Bielcikova and Bland, \{L. C.\} and Bordyuzhin, \{I. G.\} and Brandenburg, \{J. D.\} and Brandin, \{A. V.\} and S. Bueltmann and J. Butterworth and H. Caines and \{Calder{\'o}n De La Barca S{\'a}nchez\}, M. and D. Cebra and I. Chakaberia and P. Chaloupka and Chan, \{B. K.\} and Chang, \{F. H.\} and Z. Chang and N. Chankova-Bunzarova and A. Chatterjee and D. Chen and Chen, \{J. H.\} and X. Chen and Z. Chen and J. Cheng and M. Cherney and M. Chevalier and S. Choudhury and W. Christie and R. Esha and J. Jia and R. Lacey",

note = "Publisher Copyright: {\textcopyright} 2020 authors.",

year = "2020",

month = nov,

day = "20",

doi = "10.1103/PhysRevD.102.092009",

language = "English",

volume = "102",

journal = "Physical Review D",

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T1 - Measurement of inclusive J/ψ polarization in p+p collisions at s =200 GeV by the STAR experiment

AU - (STAR Collaboration)

AU - Adam, J.

AU - Adamczyk, L.

AU - Adams, J. R.

AU - Adkins, J. K.

AU - Agakishiev, G.

AU - Aggarwal, M. M.

AU - Ahammed, Z.

AU - Alekseev, I.

AU - Anderson, D. M.

AU - Aparin, A.

AU - Aschenauer, E. C.

AU - Ashraf, M. U.

AU - Atetalla, F. G.

AU - Attri, A.

AU - Averichev, G. S.

AU - Bairathi, V.

AU - Barish, K.

AU - Behera, A.

AU - Bellwied, R.

AU - Bhasin, A.

AU - Bielcik, J.

AU - Bielcikova, J.

AU - Bland, L. C.

AU - Bordyuzhin, I. G.

AU - Brandenburg, J. D.

AU - Brandin, A. V.

AU - Bueltmann, S.

AU - Butterworth, J.

AU - Caines, H.

AU - Calderón De La Barca Sánchez, M.

AU - Cebra, D.

AU - Chakaberia, I.

AU - Chaloupka, P.

AU - Chan, B. K.

AU - Chang, F. H.

AU - Chang, Z.

AU - Chankova-Bunzarova, N.

AU - Chatterjee, A.

AU - Chen, D.

AU - Chen, J. H.

AU - Chen, X.

AU - Chen, Z.

AU - Cheng, J.

AU - Cherney, M.

AU - Chevalier, M.

AU - Choudhury, S.

AU - Christie, W.

AU - Esha, R.

AU - Jia, J.

AU - Lacey, R.

PY - 2020/11/20

Y1 - 2020/11/20

N2 - We report on new measurements of inclusive J/ψ polarization at midrapidity in p+p collisions at s=200 GeV by the STAR experiment at the Relativistic Heavy Ion Collider. The polarization parameters, λθ, λφ, and λθφ, are measured as a function of transverse momentum (pT) in both the helicity and Collins-Soper (CS) reference frames within pT<10 GeV/c. Except for λθ in the CS frame at the highest measured pT, all three polarization parameters are consistent with 0 in both reference frames without any strong pT dependence. Several model calculations are compared with data, and the one using the Color Glass Condensate effective field theory coupled with nonrelativistic QCD gives the best overall description of the experimental results, even though other models cannot be ruled out due to experimental uncertainties.

AB - We report on new measurements of inclusive J/ψ polarization at midrapidity in p+p collisions at s=200 GeV by the STAR experiment at the Relativistic Heavy Ion Collider. The polarization parameters, λθ, λφ, and λθφ, are measured as a function of transverse momentum (pT) in both the helicity and Collins-Soper (CS) reference frames within pT<10 GeV/c. Except for λθ in the CS frame at the highest measured pT, all three polarization parameters are consistent with 0 in both reference frames without any strong pT dependence. Several model calculations are compared with data, and the one using the Color Glass Condensate effective field theory coupled with nonrelativistic QCD gives the best overall description of the experimental results, even though other models cannot be ruled out due to experimental uncertainties.

UR - https://www.scopus.com/pages/publications/85097129164

U2 - 10.1103/PhysRevD.102.092009

DO - 10.1103/PhysRevD.102.092009

M3 - Article

AN - SCOPUS:85097129164

SN - 2470-0010

VL - 102

JO - Physical Review D

JF - Physical Review D

IS - 9

M1 - 092009

ER -

Measurement of inclusive J/ψ polarization in p+p collisions at s =200 GeV by the STAR experiment

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