SMuK 2023 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

T: Fachverband Teilchenphysik

T 77: Flavor VI

T 77.2: Vortrag

Mittwoch, 22. März 2023, 17:45–18:00, HSZ/0401

Updated Search for Rare Electroweak Decay BK(*)νν to Constrain New Physics Models — •Caspar Schmitt, Sviatoslav Bilokin, and Thomas Kuhr — LMU München, Am Coulombwall 1, 85748 Garching, Germany

Precision measurements of rare decays serve as indirect searches for new physics up to scales well beyond the collider energy, since Standard Model contributions are strongly suppressed. Multiple anomalies are seen in rare decays of B mesons, in particular of the type BK(*)l+l. We search hints for new physics in the neutral lepton channel BK(*)νν, which is closely related assuming an unbroken SU(2) Standard Model symmetry. This channel allows particularly precise theoretical predictions and can help reducing hadronic uncertainties in the charged lepton channel.

Experimentally the decay has not yet been detected and is challenging due to the two neutrinos in its final state. Belle II currently is the only experiment in operation that can infer the decay from missing energy and momentum searches. Current experimental limits are model-dependent and a factor 3 to 5 above the Standard Model expectations.

In subsets of new physics models, Wilson coefficients map onto observables and make clear experimental signatures for different new physics scenarios accessible. We explore possibilities for model-independent q2-binned searches for new physics contributions in BK(*)νν by employing novel untagged methods using machine learning.

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2023 > SMuK