Abstract
We report a study of the suppressed decay B-→DK -, D→K+π-π0, where D denotes either a D0 or a D̄0 meson. The decay is sensitive to the CP -violating parameter 3. Using a data sample of 772×106 BB̄ pairs collected at the Υ(4S) resonance with the Belle detector, we measure the ratio of branching fractions of the above suppressed decay to the favored decay B-→DK-, D→K-π+π0. Our result is RDK=[1.98±0.62(stat)±0.24(syst)] ×10-2, which indicates the first evidence of the signal for this suppressed decay with a significance of 3.2 standard deviations. We measure the direct CP asymmetry between the suppressed B- and B+ decays to be ADK=0.41±0.30(stat)±0.05(syst). We also report measurements for the analogous quantities RDπ and A Dπ for the decay B-→Dπ-, D→K+π-π0.
Original language | English |
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Article number | 091104 |
Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |
Volume | 88 |
Issue number | 9 |
DOIs | |
Publication status | Published - 2013 Nov 14 |
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)