https://doi.org/10.1140/epjc/s10052-017-5227-5
Regular Article - Theoretical Physics
Optimal observable analysis for the decay 
plus missing energy
1
Department of Physics, University of Calcutta, 92 Acharya Prafulla Chandra Road, Kolkata, 700009, India
2
Department of Physics, Indian Institute of Technology, Guwahati, 781039, India
* e-mail: sunando.patra@gmail.com
Received:
20
May
2017
Accepted:
15
September
2017
Published online:
26
September
2017
The decay 
has received comparatively less attention than the semileptonic decay 
, because neutrinos pass undetected and hence the process offers lesser number of observables. We show how the decay 
invisible(s) can shed light, even with a limited number of observables, on possible new physics beyond the Standard Model and also show, quantitatively, the reach of future B factories like SuperBelle to uncover such new physics. Depending on the operator structure of new physics, different channels may act as the best possible probe. We show, using the optimal observable technique, how almost the entire parameter space allowed till now can successfully be probed at a high-luminosity B factory.
© The Author(s), 2017
