Karlsruhe 2024 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 23: Top physics 1
T 23.5: Vortrag
Montag, 4. März 2024, 17:00–17:15, Geb. 30.95: Audimax
Search for ttγγ production in lepton+jets channel in pp collisions at √s=13 TeV with the ATLAS detector — Diptaparna Biswas1, Beatrice Cervato1, Markus Cristinziani1, Carmen Diez Pardos1, Ivor Fleck1, •Arpan Ghosal1, Gabriel Gomes1, Jan Joachim Hahn1, Vadim Kostyukhin1, Nils Krengel1, Buddhadeb Mondal1, Stefanie Müller1, Katharina Voss1, Wolfgang Walkowiak1, Adam Warnerbring1, and Tongbin Zhao1,2 — 1Center for Particle Physics Siegen, Experimentelle Teilchenphysik, Universität Siegen — 2Shandong University, China
The top quark pair production (tt) in association with one or more photons is a key Standard Model process for measuring the strength of the electroweak coupling of the top quark with the photon. While the production of tt with one photon is well-studied, the rarer tt production with two photons (ttγγ) still remains unobserved. The ttγγ process is not only a good candidate for probing the electroweak coupling of the top quark, but it is also significant as an irreducible background to the tt production in association with a Higgs boson decaying to two photons. Understanding the ttγγ process can help tighten constraints on anomalous electric and magnetic dipole moments, through which new CP-violating sources can manifest. The talk will discuss the ongoing efforts in the search for the ttγγ process in the single-lepton tt decay channel using the full Run 2 dataset collected by the ATLAS detector at √s = 13 TeV.
Keywords: Top Quark; Photon; Lepton+Jets Channel; ATLAS; Boosted Decision Trees