17 research outputs found
Measurement of CP asymmetry in Cabibbo suppressed D0 decays
We measure the CP-violating asymmetries in decays to the D0 -> K+K- and D0 ->
pi+pi- CP eigenstates using 540 fb^{-1} of data collected with the Belle
detector at or near the Upsilon(4S) resonance. Cabibbo-favored D0 -> K-pi+
decays are used to correct for systematic detector effects. The results,
A_{CP}^{KK} = (-0.43 +- 0.30 +- 0.11)% and A_{CP}^{pipi} = (+0.43 +- 0.52 +-
0.12)%, are consistent with no CP violation.Comment: Submitted to Phys. Lett.
Search for
We report a search for the decay , using a sample of 657
pairs collected with the Belle detector at the
resonance. No statistically significant signal is found and an
upper limit for the branching fraction is determined to be at 90% confidence level.Comment: 5 pages, 2 figures, 3 tables, submitted to PRD(RC
Evidence for Neutral B Meson Decays to wK*0
We present the results of a study of the charmless vector-vector decay
B0->wK*0 with 657x10^6 BB(bar) pairs collected with the Belle detector at the
KEKB e+e- collider. We measure the branching fraction to be
B(B0->wK*0)=[1.8+/-0.7(stat)+/-0.3(syst)]x10^-6 with 3.0sigma significance. We
also perform a helicity analysis of the w and K*0 vector mesons, and obtain the
longitudinal polarization fraction
fL(B0->wK*0)=0.56+/-0.29(stat)+0.18-0.08(syst). Finally, we measure a large
non-resonant branching fraction B[B->wK+pi-; M(Kpi)\in(0.755,1.250)
GeV/c^2]=[5.1+/-0.7(stat)+/-0.7(syst)]x10^-6 with a significance of 9.5sigma.Comment: 6 pages, 3 figures (7 figure files