Abstract
In the present work, $k_T$-factorization formalism is applied to compute the exclusive dilepton production by timelike Compton scattering (TCS) in $eA$, $pA$ and $AA$ collisions. The nuclear effects are investigated considering heavy and light ions. The production cross section in terms of invariant mass and rapidity distribution of the lepton pair is shown. The analysis is done for electron-ion collisions at the Large Hadron-Electron Collider (LHeC), its high-energy upgrade (HE-LHeC) and at the Future Circular Collider (FCC) in lepton-hadron mode. Additionally, ultraperipheral heavy ion collisions at future runs of the Large Hadron Collider (LHC) and at the FCC (hadron-hadron mode) are also considered.
Highlights
Timelike Compton scattering (TCS) has been recently investigated in Ref. [1] in the context of the kT-factorization formalism
One interesting process is the electron-nucleus collision, which is planned to be investigated at the Electron-Ion Collider (EIC) [4] and at the Large HadronElectron Collider (LHeC) [5]
Photonuclear reactions can be studied in ultraperipheral heavy ion collisions [6,7], and it would be timely to analyze TCS in electromagnetic processes for large-impact-parameter proton-nucleus and nucleus-nucleus collisions
Summary
Timelike Compton scattering (TCS) has been recently investigated in Ref. [1] in the context of the kT-factorization formalism. The kT factorization is a suitable formalism to compute the relevant distribution and cross sections Within this regime, the longitudinal momentum fraction of partons, x, is small. The goal here is to examine TCS in nuclear targets for the first time in the kT-factorization approach It opens the possibility of carrying out a detailed study on the role played by the nonlinear QCD effects as the saturation scale is enhanced in nuclei in comparison with proton targets [23]. This work is organized as follows: In Sec. II, we present the model from which we will build the nuclear unintegrated distribution function applying the Glauber-Mueller approach and discuss the technique employed to do so.
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