Dortmund 2021 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 6: Flavour physics I

T 6.8: Vortrag

Montag, 15. März 2021, 17:45–18:00, Tf

Rare charm cuνν dineutrino null test for e+ e–machines — •Rigo Bause, Hector Gisbert, Marcel Golz, and Gudrun Hiller — TU Dortmund

Rare |Δ c|=|Δ u|=1 transitions into dineutrinos are strongly GIM-suppressed and constitute excellent null tests of the standard model. While branching ratios of cu νν transitions are experimentally unconstrained, signals of new physics can be just around the corner.

Signatures of these modes, including DP  ν ν or DP+ P   ν ν with P=π, K, Λcp  ν ν, contain missing energy and are well suited for experimental searches at e+ e–facilities, such as BES III, Belle II and future e+ e–colliders, such as the FCC-ee running at the Z.

Using current bounds on cu  ℓ+ transitions, model-independent upper limits on branching ratios assuming lepton universality and charged lepton flavour conservation are presented (arxiv:2010.02225). An observation in excess of these upper limits implies a breakdown of the corresponding symmetry.

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