10–15 Dec 2023
Playa del Carmen
America/Cancun timezone

Photon-photon collisions with the gamma-UPC MC generator

15 Dec 2023, 09:00
30m
Playa del Carmen

Playa del Carmen

Iberostar TUCAN, Lote Hotelero Nº2, P.º Xaman - Ha, Playacar, 77710 Playa del Carmen, Q.R., Mexico
Session 6: MC and UPCs Monte Carlo models

Speaker

David d'Enterria (CERN)

Description

The automated generation of arbitrary exclusive final states produced via photon fusion in ultraperipheral high-energy collisions of protons and/or nuclei, A B \to A X B, is implemented in the MadGraph5_aMC@NLO and HELAC-Onia Monte Carlo codes. Cross sections are calculated in the equivalent photon approximation using γ fluxes derived from electric dipole and charge form factors, and incorporating hadronic survival probabilities. In the case of exclusive dilepton productions, QED corrections at next-to-leading-order accuracy are included. Multiple examples of γγ cross sections computed with this setup, named gamma-UPC, are presented for proton-proton, proton- nucleus, and nucleus-nucleus ultraperipheral collisions (UPCs) at the Large Hadron Collider and Future Circular Collider. Total photon-fusion cross sections for the exclusive production of spin-0, 2 resonances (quarkonia, ditauonium, and Higgs boson; as well as axions and gravitons), and for pairs of particles (J/ψJ/ψ, WW, ZZ, Zγ, tt‾, HH) are presented. Differential cross sections for exclusive dileptons and light-by-light scattering are compared to LHC data.

Primary author

Co-author

Huasheng Shao (Centre National de la Recherche Scientifique (FR))

Presentation materials