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

• Verfasst von: Adam, Jaroslav [VerfasserIn]
• Verfasst von: Deppner, Ingo Martin [VerfasserIn]
• Verfasst von: Herrmann, Norbert [VerfasserIn]
• Verfasst von: Weidenkaff, Philipp [VerfasserIn]
• Titel: Measurement of inclusive J/ψ polarization in p+p collisions at √s=200 GeV by the STAR experiment
• Körperschaft: STAR Collaboration [VerfasserIn]
• Verf.angabe: STAR Collaboration, J. Adam, I.M. Deppner, N. Herrmann, P.C. Weidenkaff, [und 357 weitere]
• E-Jahr: 2020
• Jahr: 20 November 2020
• Umfang: 15 S.
• Fussnoten: Im Titel wird psi als griechischer Buchstabe dargestellt ; Im Titel steht der Buchstabe s unter dem Wurzelsymbol ; Gesehen am 12.01.2021
• Titel Quelle: Enthalten in: Physical review
• Ort Quelle: Woodbury, NY : Inst., 2016
• Jahr Quelle: 2020
• Band/Heft Quelle: 102(2020,9) Artikel-Nummer 092009, 15 Seiten
• ISSN Quelle: 2470-0029
• DOI: doi:10.1103/PhysRevD.102.092009
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1744374805

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.