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Measurement of the inclusive J/$\psi$ polarization at forward rapidity in pp collisions at $\sqrt{s} = 8$ TeV

The ALICE collaboration
No Journal Information, 2018

Abstract (data abstract)
CERN-LHC. Measurement of the inclusive J/psi polarization at forward rapidity in pp collisions at sqrt{s} = 8 TeV. Inclusive J/psi polarization parameters is studied in proton-proton collisions at a centre-of-mass energy sqrt{s} = 8 TeV, using the ALICE detector at the CERN LHC. The J/psi mesons are reconstructed, via their decay to a muon pair, in the rapidity interval 2.5 < y < 4.0. The polarization parameters (lambda_theta, lambda_phi and lambda_thetaphi) of inclusive J/psi, as well as an invariant frame quantity, are studied in both helicity and Collins-Soper frames as a function of transverse momentum (p_T) in the interval 2 < p_T < 15 GeV/c. The p_T integrated results are projected in 2-D parameter-space. The measurements exhibit no polarization of inclusive J/psi within experimental uncertainties. In the paper, results are compared to previous measurements at sqrt{s} = 7 TeV from ALICE and LHCb, and also to up-to-date NLO predictions of the Color-Singlet-Model and the NRQCD calculation at sqrt{s} = 8 TeV.

  • Table 1

    Data from Page 8 and 9 of preprint, Fig. 3 and 4, top left plot (black points)

    None

    ALICE inclusive J/psi polarization parameters lambda_theta in the Collins-Soper frame as a function of p_T in pp collisions at sqrt{s}...

  • Table 2

    Data from Page 8 and 9 of preprint, Fig. 3 and 4, middle left plot (black points)

    None

    ALICE inclusive J/psi polarization parameters lambda_phi in the Collins-Soper frame as a function of p_T in pp collisions at sqrt{s}...

  • Table 3

    Data from Page 8 and 9 of preprint, Fig. 3 and 4, bottom left plot (black points)

    None

    ALICE inclusive J/psi polarization parameters lambda_thetaphi in the Collins-Soper frame as a function of p_T in pp collisions at sqrt{s}...

  • Table 4

    Data from Page 8 and 9 of preprint, Fig. 3 and 4, top right plot (black points)

    None

    ALICE inclusive J/psi polarization parameters lambda_theta in the helicity frame as a function of p_T in pp collisions at sqrt{s}...

  • Table 5

    Data from Page 8 and 9 of preprint, Fig. 3 and 4, middle right plot (black points)

    None

    ALICE inclusive J/psi polarization parameters lambda_phi in the helicity frame as a function of p_T in pp collisions at sqrt{s}...

  • Table 6

    Data from Page 8 and 9 of preprint, Fig. 3 and 4, bottom right plot (black points)

    None

    ALICE inclusive J/psi polarization parameters lambda_thetaphi in the helicity frame as a function of p_T in pp collisions at sqrt{s}...

  • Table 7

    Data from Page 10 of preprint, Fig. 5 (red points)

    None

    ALICE inclusive J/psi frame-invariant quantity \widetilde{\lambda} in the Collins-Soper frame as a function of p_T in pp collisions at sqrt{s}...

  • Table 8

    Data from Page 10 of preprint, Fig. 5 (green points)

    None

    ALICE inclusive J/psi frame-invariant quantity \widetilde{\lambda} in the helicity frame as a function of p_T in pp collisions at sqrt{s}...

  • Table 9

    Data from Page 11 of preprint, Fig.6, top left plot (red contour, full line)

    None

    Contour plot (68% CL) of ALICE inclusive J/psi average pT-integrated (3 < pT < 15 GeV/c in the rapidity interval...

  • Table 10

    Data from Page 11 of preprint, Fig.6, top left plot (red contour, dotted line)

    None

    Contour plot (95% CL) of ALICE inclusive J/psi average pT-integrated (3 < pT < 15 GeV/c in the rapidity interval...

  • Table 11

    Data from Page 11 of preprint, Fig.6, top left plot (green contour, full line)

    None

    Contour plot (68% CL) of ALICE inclusive J/psi average pT-integrated (3 < pT < 15 GeV/c in the rapidity interval...

  • Table 12

    Data from Page 11 of preprint, Fig.6, top left plot (green contour, dotted line)

    None

    Contour plot (95% CL) of ALICE inclusive J/psi average pT-integrated (3 < pT < 15 GeV/c in the rapidity interval...

  • Table 13

    Data from Page 11 of preprint, Fig.6, top right plot (red contour, full line)

    None

    Contour plot (68% CL) of ALICE inclusive J/psi average pT-integrated (3 < pT < 15 GeV/c in the rapidity interval...

  • Table 14

    Data from Page 11 of preprint, Fig.6, top right plot (red contour, dotted line)

    None

    Contour plot (95% CL) of ALICE inclusive J/psi average pT-integrated (3 < pT < 15 GeV/c in the rapidity interval...

  • Table 15

    Data from Page 11 of preprint, Fig.6, top right plot (green contour, full line)

    None

    Contour plot (68% CL) of ALICE inclusive J/psi average pT-integrated (3 < pT < 15 GeV/c in the rapidity interval...

  • Table 16

    Data from Page 11 of preprint, Fig.6, top right plot (green contour, dotted line)

    None

    Contour plot (95% CL) of ALICE inclusive J/psi average pT-integrated (3 < pT < 15 GeV/c in the rapidity interval...

  • Table 17

    Data from Page 11 of preprint, Fig.6, bottom plot (red contour, full line)

    None

    Contour plot (68% CL) of ALICE inclusive J/psi average pT-integrated (3 < pT < 15 GeV/c in the rapidity interval...

  • Table 18

    Data from Page 11 of preprint, Fig.6, bottom plot (red contour, dotted line)

    None

    Contour plot (95% CL) of ALICE inclusive J/psi average pT-integrated (3 < pT < 15 GeV/c in the rapidity interval...

  • Table 19

    Data from Page 11 of preprint, Fig.6, bottom plot (green contour, full line)

    None

    Contour plot (68% CL) of ALICE inclusive J/psi average pT-integrated (3 < pT < 15 GeV/c in the rapidity interval...

  • Table 20

    Data from Page 11 of preprint, Fig.6, bottom plot (green contour, dotted line)

    None

    Contour plot (95% CL) of ALICE inclusive J/psi average pT-integrated (3 < pT < 15 GeV/c in the rapidity interval...

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