J/$ψ$ production and nuclear effects in p-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV

ALICE Collaboration

Inclusive J/$\psi$ production has been studied with the ALICE detector in p-Pb collisions at the nucleon-nucleon center of mass energy $\sqrt{s_{\rm NN}}$ = 5.02 TeV at the CERN LHC. The measurement is performed in the center of mass rapidity domains $2.03

Figures

Figure 1

The opposite-sign dimuon invariant mass spectra for the p-Pb (left) and Pb-p (right) data samples, together with the result of the fit. For the fits shown here a Crystal Ball function (shown as a dashed line) and a variable-width Gaussian have been used for the signal and the background, respectively.
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Figure 2

The nuclear modification factors for inclusive J/$\psi$ production at $\sqrt{s_{\rm NN}}=5.02$ TeV. The error bars correspond to the statistical uncertainties, the open boxes to the uncorrelated systematic uncertainties, the shaded boxes around the points represent the partially correlated systematic uncertainties. The box around $R_{\rm pPb}=1$ shows the size of the correlated uncertainties. Results from various models are also shown. The theoretical uncertainties for the EPS09 NLO calculation are due to the uncertainty on the EPS09 shadowing parameterization and to the mass and scale uncertainties on the cross section calculation. For the CGC model, the band is related to the choice of the parton saturation scale and of the charm quark mass. Finally, the $q_{\rm 0}$ value in the energy loss model represents the value of the transport coefficient in the target nucleons for $x_{\rm Bj}$=10$^{-2}$ gluons.
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Figure 3

The inclusive J/$\psi$ production cross section, as a function of rapidity. The error bars correspond to the statistical uncertainties, the open boxes to the uncorrelated systematic uncertainties, the shaded boxes around the points represent the partially correlated systematic uncertainties. The bands correspond to the inclusive J/$\psi$ pp cross section, obtained with the interpolation procedure described in the text and scaled by the Pb-nucleus mass number $A_{\rm Pb}$.
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Figure 4

The nuclear modification factors for inclusive J/$\psi$ production at $\sqrt{s_{\rm NN}}=5.02$ TeV, in bins of rapidity. The meaning of symbols and curves is the same as in Figure 2.
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Figure 5

The forward to backward ratio $R_{\rm FB}$ of the nuclear modification factors for inclusive J/$\psi$ production, compared to theoretical models. The statistical and systematic uncertainties for the experimental value are added in quadrature. For the shadowing calculations, uncertainties are quoted when available, and are obtained in the same way as in Figure 2.
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Figure 6

The forward to backward ratio $R_{\rm FB}$ of the nuclear modification factors for inclusive J/$\psi$ production, as a function of $y$ and $p_{\rm T}$, compared to theoretical models. The bars represent the statistical uncertainty, while the open boxes correspond to uncorrelated systematic uncertainties.
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