https://doi.org/10.1140/epjc/s10052-023-12326-9
Regular Article - Theoretical Physics
When energy goes missing: new physics in 
with sterile neutrinos
1
Sydney Consortium for Particle Physics and Cosmology, School of Physics, The University of New South Wales, 2052, Sydney, NSW, Australia
2
Department of Physics, IIT Hyderabad, 502285, Kandi, India
3
School of Physics, University of Hyderabad, 500046, Hyderabad, India
Received:
14
September
2023
Accepted:
4
December
2023
Published online:
14
December
2023
Belle II recently reported the first measurement of 
, which is 
above the Standard Model prediction. We explore the available parameter space of new physics within Standard Model effective field theory extended by sterile neutrinos (
SMEFT) and provide predictions for the other 
decay modes and invisible 
decays. We also briefly comment on charged current decays 
and possible ultraviolet completions of the relevant SMEFT operators.
© The Author(s) 2023
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