UPC 2023: International workshop on the physics of Ultra Peripheral Collisions

Session

Monte Carlo models

15 Dec 2023, 09:00

Playa del Carmen

Conveners

Monte Carlo models

• Minjung Kim (University of California Berkeley (US))
• Cyrille Marquet (CPHT - Ecole Polytechnique)

Monte Carlo models

• Carlos Bertulani (Texas A&M University-Commece)
• Jaroslav Adam (Czech Technical University in Prague (CZ))

33. Photon-photon collisions with the gamma-UPC MC generator

David d'Enterria (CERN)

15/12/2023, 09:00

Session 6: MC and UPCs

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...

18. Photo-nuclear collisions in Pythia 8

Dr Ilkka Helenius (University of Jyväskylä)

15/12/2023, 09:30

Session 6: MC and UPCs

Ultraperipheral heavy-ion collisions provide the first opportunity to study collisions between photons and heavy ions in high-energy colliders. The quasi-real photons emitted by the nuclei may fluctuate into a hadronic state and in fact this hadronic contribution will provide the bulk of the photon-hadron cross section. In case of a heavy-ion target the partonic structure of these resolved...

37. Novel aspects of particle production in UPCs

Dr Fernando Navarra (University of São Paulo, Brazil)

15/12/2023, 10:00

Session 2: Two-photon physics

In this talk I will address two topics. First I will discuss the production
of pions at very large rapidities (y > 7) in p-Pb and Pb-Pb collisions at the
LHC. These pions are produced through the magnetic excitation of nucleons in
the target due to the strong magnetic field generated by the projectile, i.e.,
N -> Delta -> N' pion. This process has a very large cross section and can
be...

56. The STARlight Monte Carlo

Joakim Nystrand (University of Bergen (NO))

15/12/2023, 11:00

Session 6: MC and UPCs

The STARlight Monte Carlo calculates cross sections and generates events for a variety of ultra-peripheral collisions. In particular two-photon production of dilepton pairs and single mesons, and photonuclear production of vector mesons. The collision geometry plays a major role in these interactions, and the photon spectrum is thus calculated in impact parameter space. The photonuclear vector...

19. Lepton pair production in UPCs

Yajin Zhou (Shandong University, China)

15/12/2023, 11:30

Session 5: EM and peripheral events

The coherent photons induced by relativistic heavy ions are highly linearly polarized, in close analogy to the linear polarization of gluons in a large nucleus. We proposed to measure the photon polarization through azimuthal asymmetries in dilepton production in ultraperipheral collisions. Our prediction for the asymmetries were soon confirmed by the STAR experiment with high precision. We...

87. I.ANN QCD: The Inter-American Network of Networks of QCD

Daniel Tapia Takaki (University of Kansas)

15/12/2023, 12:00

88. Event advertising

15/12/2023, 12:15

6. A generator of forward neutrons for ultra-peripheral collisions: nOOn

Michal Broz (Czech Technical University in Prague (CZ))

Session 6: MC and UPCs

The study of photon-induced reactions in collisions of heavy nuclei at RHIC and the LHC has become an important direction of the research program of these facilities in recent years. In particular, the production of vector mesons in ultra-peripheral collisions (UPC) has been intensively studied. Owing to the intense photon fluxes, the two nuclei participating in such processes undergo...