Speaker
Ulrich Nierste
(KIT)
Description
$B\to D^* \ell \nu$ decays are sensitive to contributions in which the missing energy and momentum stem from a hypothetical heavy sterile neutrino $N$. Belle II data on angular distributions in this decay are a used to search for hints $B\to D^* \ell N$ in a model-independent way. To this end dimension-6 operators with different Dirac structures are considered and competitive upper bounds on some of their couplings are derived. I will show the allowed regions in the coupling-versus-mass plane and discuss the implications.
Primary authors
Florian Bernlochner
Marco Fedele
Markus Prim
Tim Kretz
Ulrich Nierste
(KIT)
