Karlsruhe 2024 – scientific programme
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T: Fachverband Teilchenphysik
T 73: Flavour physics 3
T 73.3: Talk
Wednesday, March 6, 2024, 16:30–16:45, Geb. 30.41: HS 4
A model-independent likelihood method and its application to the Belle II B+→ K+ ν ν analysis — •Lorenz Gärtner1, Thomas Kuhr1, Slavomira Stefkova2, Danny van Dyk4, Méril Reboud5, Lukas Heinrich3, Nikolai Hartmann1, and Malin Horstmann3 — 1LMU, Munich, DE — 2KIT, Karlsruhe, DE — 3TU, Munich, DE — 4IPPP, Durham, UK — 5Siegen University, Siegen, DE
B+ → K+ ν ν decays offer a window into physics beyond Standard Model. The Belle II collaboration found the first evidence for this decay. In order to search for this decay, assumptions on its kinematic distribution were made. Consequently, the results feature a model dependency arising from both Standard Model assumptions and from the description of the pertinent hadronic matrix element, making reinterpretation complicated without reanalysing the underlying data.
We develop a novel reweighting method in order to perform reinterpretations and combinations of particle physics results. The generality of this method allows for statistical inference in the space of theoretical parameters, assuming different kinematic distributions, according to any beyond Standard model prediction.
We implement our method as an extension to the pyhf software for statistical inference and interface it with the EOS software for flavor physics phenomenology.
Furthermore, we present an easily publishable format of the resulting likelihood function and argue why publishing such likelihoods is crucial for a full exploitation of experimental results.
Keywords: rare decay; reinterpretation; combination; statistical inference