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Abstract
We present predictions for the J/ψ and ρ meson production in the heavy ion ultraperipheral collisions (UPC) for the current energy 2.76 TeV at the LHC. Both total cross sections and cross sections with the neutron emission from one or both nuclei are presented. We also perform analysis of the RHIC ρ meson photoproduction data and emphasize importance of these data for testing the current model for nucleus breakup in the UPC.
Highlights
Ultraperipheral collisions at the LHC provide a fine probe for studies of the small x dynamics in much cleaner environment than strong proton - proton collisions
The basic expressions for the cross section of production of vector mesons in ultraperipheral collisions are given in a number of papers, see e.g. [1]: dσA1 A2 →A1 A2 V dy
One can distingish several channels: 1n1n - emission of one neutron by each ion, XnXn - emission of several neutrons, 0n1n and 0nXn excitation and decay only of one ion. To estimate these partial cross sections, we use the model suggested in [2] where it is shown that coherent photoproduction with additional electromagnetic nucleus excitation can be calculated modifying the flux of photons by impact parameter dependent factors PCi (b) which account for different channels (i=0n0n, 0n1n,1n1n,0nXn, XnXn) 1
Summary
Ultraperipheral collisions at the LHC provide a fine probe for studies of the small x dynamics in much cleaner environment than strong proton - proton (nucleus) collisions. One can distingish several channels: 1n1n - emission of one neutron by each ion, XnXn - emission of several neutrons, 0n1n and 0nXn excitation and decay only of one ion To estimate these partial cross sections, we use the model suggested in [2] where it is shown that coherent photoproduction with additional electromagnetic nucleus excitation can be calculated modifying the flux of photons by impact parameter dependent factors PCi (b) which account for different channels (i=0n0n, 0n1n,1n1n,0nXn, XnXn) 1. Since the uncertainty (combined experimental errors due to the restricted statistics and systematics) of the experimental cross sections measured by STAR exceeds this number almost by factor two, we use the standard Glauber model formula [7] for calculation of the cross section of coherent ρ meson photoproduction in the kinematics of UPC of heavy ions at RHIC and LHC : tmin σγA→ρA dσγN→ρN UPC σcρoherent , mb STAR σ0ρn0n , mb STAR σ0ρnXn , mb STAR σXρ nXn , mb STAR σ0ρn1n , mb STAR σ1ρn1n , mb STAR
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