QM 2022

Light-by-light scattering cross-section measurements at LHC

7 Apr 2022, 15:00

20m

large aula A (Auditorium Maximum UJ)

Oral presentation Electroweak probes Parallel Session T13: Electroweak probes

Speaker

Dr Georgios Krintiras (The University of Kansas (US))

Description

We present the first combination of light-by-light scattering ($\gamma \gamma \to \gamma \gamma$) cross-section measurements at LHC, using lead-lead data recorded by the ATLAS and CMS Collaborations at $5.02\text{TeV}$ and corresponding to integrated luminosities of 2.2 and $0.39{\text{nb}}^{-1}$, respectively. The combined cross-section is $115\pm 19\text{nb}$, with the two measurements contributing with factors of 0.8 and 0.2, accordingly. The combined result improves upon the best individual determination of $\gamma \gamma \to \gamma \gamma$ by approximately 10%, and it is consistent with the standard model prediction within two standard deviations. For the first time, we calculate the potential contribution of the ${\eta }_b(1S)$ meson production to the $\gamma \gamma \to \gamma \gamma$ invariant mass distributions, by calculating its inclusive photoproduction cross-section.

Presentation materials

arXiv:2204.02845

LbyL_QM22

LbyL QM22.pdf