The European Physical Journal C > 2019 > 79 > 5 > 1-18
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
Source
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<y<2.7 , corresponding to an energy in the $$\gamma $$ γ p centre-of-mass in the interval $$40< W_{\gamma \mathrm {p}}<550$$ 40<Wγp<550 GeV. The measurements, which are consistent with a power law dependence of the exclusive $$\mathrm {J}/\psi $$ J/ψ photoproduction cross section, are compared to previous results from HERA and the LHC and to several theoretical models. They are found to be compatible with previous measurements.
Identifiers
journal ISSN : | 1434-6044 |
journal e-ISSN : | 1434-6052 |
DOI | 10.1140/epjc/s10052-019-6816-2 |
Authors
J. Adam
- Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Prague, Czech Republic