Exclusive photoproduction at the Tevatron and LHC within the dipole picture

TL;DR

This paper predicts the distributions of exclusive photoproduction of J/psi, Upsilon, and Z^0 bosons at Tevatron and LHC using a dipole saturation model, highlighting differences in production amplitudes.

Contribution

It introduces a method to predict exclusive photoproduction of heavy bosons using impact parameter dependent dipole models and derives wave functions for timelike neutral bosons.

Findings

Predicted rapidity distributions for J/psi, Upsilon, and Z^0 at Tevatron and LHC.

Demonstrated the dipole saturation model's effectiveness in describing HERA data.

Identified key differences between timelike boson production and virtual Compton scattering.

Abstract

We provide predictions for the rapidity distributions of exclusive photoproduced J/psi and Upsilon mesons, and Z^0 bosons, at the Tevatron and LHC. We use the equivalent-photon approximation with the photon-proton cross sections given by the impact parameter dependent dipole saturation model, which has already been shown to give a good description of a wide variety of HERA data. We derive the quark-antiquark light-cone wave functions of timelike neutral electroweak bosons. An essential difference is pointed out between the amplitude for timelike heavy boson photoproduction and the amplitude for deeply virtual Compton scattering.