On a Feasibility of Measuring Exclusive Semitauonic B0 Decays at B-Factories
Abstract
The advent of B-factories, rich sources of pure B-overline {B} pairs, increased an interest in the rare B decays. The B decay channels involving the τ lepton are very interesting both as a stringent test of the Standard Model and as a possible window for a new physics. These decays are difficult experimentally because of the presence of two neutrinos. We have performed extensive simulations of exclusive decays overline {B0}→ D+τ -overline {ν τ }and overline {B0}→ D*+τ -overline {ν τ } with a subsequent τ -→ π+π-π-ν τ decay in the BELLE detector at the KEK B-factory. It is possible to reconstruct kinematics of these decays provided we measure momentum of overline {B0} and the τ - decay vertex. Thus obtained τ - energy and direction are not far from the generated values. The main problem is the background from the inclusive overline {B0} decays. For 108 B-overline {B} pairs (one year of full-luminosity KEK-B running) we expect about 35 reconstructed overline {B0}→ D+τ -overline {ν τ } events and the same number of overline {B0}→ D*+τ -overline {ν τ } decays. The corresponding numbers of the background events from inclusive B decays are 35 and 15.
- Publication:
-
Acta Physica Polonica B
- Pub Date:
- August 1998
- Bibcode:
- 1998AcPPB..29.2065R