Karlsruhe 2024 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 52: Search for new particles 4 (leptoquarks, LHC)
T 52.7: Vortrag
Mittwoch, 6. März 2024, 17:30–17:45, Geb. 20.30: 1.067
Sensitivity to lepton-flavour-violating decays of Z and Z′ bosons using data-driven background estimation 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 processes beyond the Standard Model (SM) of particle physics. One such process is lepton flavour violation (LFV), which has already been observed in neutrino oscillations, but never in processes involving charged leptons. A search for LFV decays of Z and Z′ bosons with Z(′)→ eτµ and Z(′)→ µτe final states is motivated by various beyond-SM theories. These searches can be performed using a data-driven background estimation, which takes advantage of the idempotency of SM backgrounds under the exchange of an electron and a muon. This 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 Z and Z′ bosons using the full Run-2 data set collected by the Atlas detector in pp collisions at √s = 13 TeV, corresponding to an integrated luminosity of 140 fb−1. 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 estimation; Z and Z' bosons