Studies of J/ψ production at forward rapidity in Pb–Pb collisions at $$ \sqrt{s_{\mathrm{NN}}} $$ = 5.02 TeV

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Abstract

<jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>The inclusive J<jats:italic>/ψ</jats:italic> production in Pb–Pb collisions at the center-of-mass energy per nucleon pair <jats:inline-formula><jats:alternatives><jats:tex-math>$$ \sqrt{s_{\mathrm{NN}}} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:msub> <mml:mi>s</mml:mi> <mml:mi>NN</mml:mi> </mml:msub> </mml:msqrt> </mml:math></jats:alternatives></jats:inline-formula> = 5<jats:italic>.</jats:italic>02 TeV, measured with the ALICE detector at the CERN LHC, is reported. The J<jats:italic>/ψ</jats:italic> meson is reconstructed via the dimuon decay channel at forward rapidity (2<jats:italic>.</jats:italic>5 <jats:italic>< y <</jats:italic> 4) down to zero transverse momentum. The suppression of the J<jats:italic>/ψ</jats:italic> yield in Pb–Pb collisions with respect to binary-scaled pp collisions is quantified by the nuclear modification factor (<jats:italic>R</jats:italic><jats:sub>AA</jats:sub>). The <jats:italic>R</jats:italic><jats:sub>AA</jats:sub> at <jats:inline-formula><jats:alternatives><jats:tex-math>$$ \sqrt{s_{\mathrm{NN}}} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:msub> <mml:mi>s</mml:mi> <mml:mi>NN</mml:mi> </mml:msub> </mml:msqrt> </mml:math></jats:alternatives></jats:inline-formula> = 5<jats:italic>.</jats:italic>02 TeV is presented and compared with previous measurements at <jats:inline-formula><jats:alternatives><jats:tex-math>$$ \sqrt{s_{\mathrm{NN}}} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:msub> <mml:mi>s</mml:mi> <mml:mi>NN</mml:mi> </mml:msub> </mml:msqrt> </mml:math></jats:alternatives></jats:inline-formula> = 2<jats:italic>.</jats:italic>76 TeV as a function of the centrality of the collision, and of the J<jats:italic>/ψ</jats:italic> transverse momentum and rapidity. The inclusive J<jats:italic>/ψ R</jats:italic>AA shows a suppression increasing toward higher transverse momentum, with a steeper dependence for central collisions. The modification of the J<jats:italic>/ψ</jats:italic> average transverse momentum and average squared transverse momentum is also studied. Comparisons with the results of models based on a transport equation and on statistical hadronization are carried out.</jats:p>

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