Aachen 2019 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 14: Elektroschwache Wechselwirkung

T 14.10: Vortrag

Montag, 25. März 2019, 18:20–18:35, S14

Towards detecting new physics with photon-photon collisions with the ATLAS Forward Proton (AFP) detector — Vlasios Petousis and •André Sopczak — Institute of Experimental and Applied Physics, Czech Technical University in Prague

The quantum-mechanical process Light-by-Light (LbyL) scattering (γγ → γγ) is forbidden in the classical theory of electrodynamics. In the Standard Model of particle physics, the virtual particles that mediate the LbyL coupling are electrically charged fermions or W bosons. This reaction is accessible at the Large Hadron Collider (LHC) owing to the large electromagnetic field strengths generated by ultra-relativistic proton-proton reactions in elastic interactions. A novel detector (AFP) was installed ±200 m from the central interaction point (IP) which took successfully data in 2017 and 2018 to tag deflected protons from the elastic interactions. While determining the rate of the produced exclusive photon pairs in the IP in coincidence with the detected protons and comparison with the Standard Model expectation, any excess would be an indication of new physics beyond the Standard Model. At the LHC, the photon-photon interactions achieve an energy never achieved before. First, a performance study with γγ → µµ which has a higher rate than LbyL, was performed to demonstrate the functionality of the AFP detector and the analysis method.