Göttingen 2025 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 98: Electroweak Physics III (W/Z Production and Properties)
T 98.1: Vortrag
Freitag, 4. April 2025, 09:00–09:15, VG 2.103
Sensitivity to lepton-flavour-violating decays of the Z boson using a data-driven background estimate with the ATLAS Experiment — •Naman Kumar Bhalla, Valerie Lang, and Markus Schumacher — Albert-Ludwigs-Universität Freiburg
One of the primary goals of the Large Hadron Collider (Lhc) program is to look for phenomena beyond the Standard Model (SM) of particle physics. One such phenomenon is lepton flavour violation (LFV), which has already been observed in neutrino oscillations, but not in processes involving charged leptons. A search for LFV in decays of the Z boson with charged leptons in the final state, such as Z → eτµ and Z → µτe, is of high interest and well motivated by various beyond-SM theories. This search can be performed using a data-driven background estimate, which takes advantage of the idempotency of SM backgrounds under the exchange of an electron and a muon. The symmetry is broken only by the difference in branching ratios between LFV decays with eτ and µτ final states.
This talk discusses the achievable sensitivities for the search of LFV decays of the Z boson using this data-driven background estimate. The full Run-2 data set is used, which was collected by the Atlas detector in pp collisions at √s = 13 TeV, corresponding to an integrated luminosity of 140 fb−1. The data-driven estimate, the neural network used to classify the LFV signal against other background processes along with the statistical model used for the analysis are presented.
Keywords: Lepton flavour violation; Data-driven background estimate; Z boson