Energy dependence of exclusive $$\mathrm {J}/\psi $$ J/ψ photoproduction off protons in ultra-peripheral p–Pb collisions at $$\sqrt{s_{\mathrm {\scriptscriptstyle NN}}} = 5.02$$ sNN=5.02 TeV

Abstract The ALICE Collaboration has measured the energy dependence of exclusive photoproduction of $$\mathrm {J}/\psi $$ J/ψ vector mesons off proton targets in ultra–peripheral p–Pb collisions at a centre-of-mass energy per nucleon pair $$\sqrt{s_\mathrm{NN}} = 5.02$$ sNN=5.02 TeV. The e$$^+$$ + e$$^-$$ - and $$\mu ^+\mu ^-$$ μ+μ- decay channels are used to measure the cross section as a function of the rapidity of the $$\mathrm {J}/\psi $$ J/ψ in the range $$-2.5< y < 2.7$$ -2.5