Joint ECFA-NuPECC-APPEC Workshop “Synergies between the EIC and the LHC”

We discuss the central exclusive photoproduction of $\pi^{+}\pi^{-}$ pairs in diffractive photon-proton and in proton-proton collisions at high energies. We consider the resonant ($\rho^{0}$, $\omega$, $f_{2}(1270)$) and non-resonant (Drell-S\"oding) contributions. Our calculation is based on the tensor-pomeron approach. For the $pp\to pp\pi^{+}\pi^{-}$ reaction, we calculate differential...

We investigate the exclusive production of the pseudoscalar meson $\eta_c$ in electron-ion collisions through $\gamma^* \gamma$ interactions. At high energies, this process is dominated by photon-photon fusion, enhanced by the strong nuclear photon flux. We present cross-section predictions for future facilities (EIC, EicC, LHeC), focusing on rapidity, transverse momentum, and photon...

In recent years, the description of lepton-pair production in ultra-peripheral collisions (UPCs) of heavy nuclei has attracted significant attention, particularly with the release of new STAR data. When the dilepton pair is produced almost back-to-back, hence at small $q_T$, the observable starts to be sensitive to the photon Wigner distribution. They are related via Fourier transform to the...

In this contribution, we suggest to consider photon-photon scattering as a useful source of information on transverse-momentum-dependent fragmentation functions (TMD FFs), complementing SIDIS and e+e- annihilation processes, which provide most of the present phenomenological information on TMD FFs. As a first illustrative example, we study two-hadron azimuthal asymmetries around the jet...