With the full data sample of 772 × 106 BB¯ pairs recorded by the Belle detector at the KEKB electronpositron
collider, the decay B¯ ? Dt- ¯?t is studied with the hadronic t decays t- ? p-?t and t- ? ?-?t.
The t polarization PtðDÞ in two-body hadronic t decays is measured, as well as the ratio of the branching
fractions RðDÞ ¼ BðB¯ ? Dt- ¯?tÞ=BðB¯ ? Dl- ¯?lÞ, where l- denotes an electron or a muon. Our
results, PtðDÞ ¼ -0.38 0.51ðstatÞþ0.21
-0.16
ðsystÞ and RðDÞ ¼ 0.270 0.035ðstatÞþ0.028
-0.025
ðsystÞ, are consistent
with the theoretical predictions of the standard model. The polarization values of PtðDÞ > þ0.5 are
excluded at the 90% confidence level.
Revised: December 12, 2019 |
Published: January 1, 2018
Citation
Hirose S., T. Iijima, I. Adachi, K. Adamczyk, H. Aihara, S. Al Said, and D.M. Asner, et al. 2018.Measurement of the t lepton polarization and R(D*) in the decay B -> D* r - ¯ vr with one-prong hadronic t decays at Belle.Physical Review D 97, no. 1:Article No. 012004.PNNL-SA-132801.doi:10.1103/PhysRevD.97.012004