Erlangen 2026 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 72: Flavour Physics IV
T 72.4: Vortrag
Donnerstag, 19. März 2026, 17:00–17:15, KH 01.011
Prospects for Bs0→τ+τ− searches in final states with six charged pions at the FCC-ee — •Anuar Sifuentes Name1, Jan Kieseler1, Markus Klute1, Joscha Knolle1, Alejandro Quiroga Trivino1, Samuel Wyrowski1, and Xunwu Zuo2 — 1Institute for Experimental Particle Physics (ETP), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany — 2Ecole polytechnique federale de Lausanne (EPFL), Lausanne, Switzerland
Recent results from the LHCb and Belle-II experiments have reported hints of lepton flavor universality (LFU) violation in rare B meson decays. One particularly interesting probe for this potential deviation from the standard model (SM) of particle physics is the measurement of the branching fraction of the rare decay Bs0→τ+τ−, for which the expected LHCb sensitivity at the end of the HL-LHC era is several orders of magnitude away from the SM prediction. The future circular collider (FCC), operated with electron-positron collisions at the Z pole, will offer an experimentally clean environment to search for this decay. In this contribution, an analysis strategy is presented that targets the final state corresponding to the decay chain Bs0→τ+ τ− → 6π±2ν. Through an optimized set of dedicated kinematic cuts and training of machine-learning discriminants, a sufficient separation between the signal and the background from other Z→ bb events is achieved to demonstrate the capability of the FCC to probe LFU in beyond-the-SM scenarios.
Keywords: B physics; tau physics; future circular collider; lepton flavor universality; machine learning