gamma-UPC: automated generation of exclusive photon-photon processes in ultraperipheral proton and nuclear collisions with varying form factors

• Published in: The journal of high energy physics 2022-09, Vol.2022 (9), p.248-43, Article 248
• Main Authors: Shao, Hua-Sheng, d’Enterria, David
• Format: Article
• Language: English
• Subjects: Approximation; Atomic collisions; Atoms & subatomic particles; Automation; Axions and ALPs; Charged particles; Classical and Quantum Gravitation; Cross-sections; Electric dipoles; Electroweak Precision Physics; Elementary Particles; Form factors; Gravitons; Higgs bosons; High energy physics; High Energy Physics - Experiment; High Energy Physics - Phenomenology; Large Hadron Collider; Light; Mathematical analysis; Nuclear Experiment; Nuclear Theory; Photons; Physics; Physics and Astronomy; Precision QED; Protons; Quantum Field Theories; Quantum Field Theory; Quantum Physics; Quarkonium; Quarks; Regular Article - Theoretical Physics; Relativity Theory; String Theory
• ISSN: 1029-8479; 1126-6708; 1029-8479
• DOI: 10.1007/JHEP09(2022)248

A bstract The automated generation of arbitrary exclusive final states produced via photon fusion in ultraperipheral high-energy collisions of protons and/or nuclei, A B → γγ A X B, is implemented in the M ad G raph 5_ a MC@NLO and HELAC-O nia 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. 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, t t ¯ , HH) are presented. Differential cross sections for exclusive dileptons and light-by-light scattering are compared to LHC data. This development paves the way for the upcoming automatic event generation of any UPC final state with electroweak corrections at next-to-leading-order accuracy and beyond.