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T: Fachverband Teilchenphysik

T 77: Flavor VI

T 77.6: Talk

Wednesday, March 22, 2023, 18:45–19:00, HSZ/0401

New Physics at the K → π ν ν kinematic distributions — •Kai Sieja¹, Emmanuel Stamou¹, Mustafa Tabet¹, and Martin Gorbahn² — ¹TU Dortmund, Germany — ²University of Liverpool, United Kingdom

The rare decays K⁺ → π⁺ ν ν and K_L → π⁰ ν ν are among the strongest probes of Beyond-the-Standard-Model dynamics with new sources of quark-flavour violation. These decays are thus the main target for the dedicated experiments NA62 and KOTO. Working within the LEFT framework, we analyze the impact of dimension-six operators including lepton-number violating ones on the experimentally accessible distributions. Concrete New Physics models can induce operators with different chirality, i.e., vector-, scalar, tensor-type operators, and different neutrino flavour structure. Using published data from NA62, we assess the impact of a combined binned likelihood in constraining the New Physics parameter space and how this varies for different operator types.