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Roman Lavicka (Austrian Academy of Sciences (AT))12/06/2025, 14:20Photon-photon physics, precision tests of SM and BSM
The anomalous magnetic moment of the tau lepton ($a_{\tau}$) is a sensitive probe for the search for deviations from the Standard Model predictions and thus for new physics. This study investigates the feasibility of measuring $a_{\tau}$ using ultra-peripheral collisions (UPCs) at the LHC, where photon-photon interactions ($\gamma\gamma\to \tau^+\tau^-$) produce tau lepton pairs. We focus on...
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Kartik Deepak Bhide (University of Freiburg (DE))12/06/2025, 14:40Photon-photon physics, precision tests of SM and BSM
In ultra-relativistic heavy-ion collisions, high rates of $\gamma\gamma$ processes occur through the interaction of the large electromagnetic fields of the heavy nuclei. For large impact parameters between the nuclei, i.e. interaction distances larger than the nuclei's radii, the di-photon interaction can be the only one taking place, leading to very clean signatures in the detector. One of...
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Michael Murray (The University of Kansas (US))12/06/2025, 15:00Photon-photon physics, precision tests of SM and BSM
To be included
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Huasheng Shao (Centre National de la Recherche Scientifique (FR))12/06/2025, 15:20Photon-photon physics, precision tests of SM and BSM
I will discuss the recent NLO calculations for gamma-gamma physics.
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Antoni Szczurek12/06/2025, 15:40Photon-photon physics, precision tests of SM and BSM
The current state of art estimations lead to cross sections
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for $AA \to \gamma \gamma AA$ which are somewhat
smaller than the measured ones by the ATLAS and CMS Collaborations.
We calculate inelastic contribution to $\gamma \gamma \to \gamma \gamma$
scattering process in $A A \to \gamma \gamma X Y$ where $X, Y = A, A'$.
We include processes of coupling of photons to individual... -
Lucy Lewitt (University of Sheffield (GB))12/06/2025, 16:30Photon-photon physics, precision tests of SM and BSM
In ultra-relativistic heavy-ion collisions, the Lorentz-contracted electromagnetic fields of the ions generate intense quasi-real photon fluxes. These lead to photon-induced interactions that have been observed in ultra-peripheral collisions (UPCs), such as vector meson and lepton-pair production. The high photon flux also enables the occurrence of multiple photon-induced processes in a single...
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Mariola Klusek-Gawenda (Institute of Nuclear Physics Polish Academy of Sciences)12/06/2025, 16:50Photon-photon physics, precision tests of SM and BSM
Kaon pairs can be produced via photoproduction ($\gamma$-Pomeron) or photon-photon fusion ($\gamma\gamma$). A significant contribution to kaon pair production comes from the decay of scalar, tensor, and vector mesons. The study will provide a comprehensive description of dikaon production at both the elementary ($\gamma\gamma \to m \to K^+ K^-$) and nuclear ($Pb Pb \to Pb Pb K^+ K^-$) levels....
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Dr David Tlusty (Creighton University)12/06/2025, 17:10Photon-photon physics, precision tests of SM and BSM
One of the most pressing questions in both hot and cold QCD communities is what the physics mechanism responsible for modified parton densities in heavy nuclei is. One promising channel to address this question is the photoproduction of vector mesons, which is considered a clean probe to the nuclear parton structures.
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We present a measurement of $\pi^+\pi^-\pi^+\pi^-$ and $\pi^+\pi^-$... -
Xinbai Li (University of Science and Technology of China)13/06/2025, 09:30Photon-photon physics, precision tests of SM and BSM
Relativistic heavy-ion collisions generate extremely strong electromagnetic (EM) fields, providing an ideal environment to study the EM excitation of the vacuum. The Breit-Wheeler process, which involves the electron-position pair production via photon-photon interactions, represents the lowest-order decay mode of the QED vacuum excitation. This process was first observed by the STAR...
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Luca Maxia (LPTHE - CNRS)13/06/2025, 09:50Photon-photon physics, precision tests of SM and BSM
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 RHIC data. The description of this process can be achieved by introducing the so-called Wigner distribution of the photons. They are related via Fourier transform to the generalised transverse momentum...
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Yajin Zhou (Shandong University)13/06/2025, 10:10Photon-photon physics, precision tests of SM and BSM
Photon-induced processes in ultra-peripheral collisions have attracted considerable attention in recent years due to their potential to probe various aspects of nuclear and particle physics. A key feature of these processes is the azimuthal modulation of particle production, which provides critical insights into the underlying dynamics of interactions involving quasi-real photons. In this talk...
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Samuel Corey13/06/2025, 10:30Photon-photon physics, precision tests of SM and BSM
In ultraperipheral collisions, the invariant mass spectrum of $\pi^+ \pi^-$ pairs is very complex due to the numerous production channels and intermediate states. The quantum ambiguity between production channels, referred to as the Entanglement Enabled Spin Interference (EESI) effect, leads to angular anisotropy in the final state. The most dominant contribution to the invariant mass spectrum...
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Krzysztof Ciesla (AGH University of Krakow (PL))13/06/2025, 11:20Photon-photon physics, precision tests of SM and BSM
In ultraperipheral Pb+Pb collisions, intense electromagnetic fields enable the generation of magnetic monopole pairs via the Schwinger mechanism. Due to their high ionization and unique trajectories in a solenoidal magnetic field, monopoles are expected to leave a large number of clusters in the innermost ATLAS pixel detector without associated reconstructed charged-particle tracks or...
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