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Angular decay coefficients of J /ψ mesons at forward rapidity from p+p collisions at √s =510 GeV

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    0519183 - FZÚ 2020 RIV US eng J - Journal Article
    Adare, A. - Aidala, C. - Ajitanand, N.N. - Vrba, Václav
    Angular decay coefficients of J /ψ mesons at forward rapidity from p+p collisions at √s =510 GeV.
    Physical Review D. Roč. 95, č. 9 (2017), s. 1-13, č. článku 092003. ISSN 2470-0010
    Institutional support: RVO:68378271
    Keywords : J/psi(3100): transverse momentum * helicity * numerical calculations: Monte Carlo * experimental results * 510 GeV-cms
    Subject RIV: BF - Elementary Particles and High Energy Physics
    OBOR OECD: Particles and field physics
    Impact factor: 4.394, year: 2017
    https://doi.org/10.1103/physrevd.95.092003

    We report the first measurement of the full angular distribution for inclusive J/ψ→μ+μ− decays in p+p collisions at s√=510 GeV. The measurements are made for J/ψ transverse momentum 2<pT<10 GeV/c and rapidity 1.2<y<2.2 in the Helicity, Collins-Soper, and Gottfried-Jackson reference frames. In all frames the polar coefficient λθ is strongly negative at low pT and becomes close to zero at high pT, while the azimuthal coefficient λϕ is close to zero at low pT, and becomes slightly negative at higher pT. The frame-independent coefficient λ~ is strongly negative at all pT in all frames. The data are compared to the theoretical predictions provided by nonrelativistic quantum chromodynamics models.

    Permanent Link: http://hdl.handle.net/11104/0304213
     
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