ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2012, vol. 85, p. -
First measurement of φ 3 with a model-independent Dalitz plot analysis of B±→DK±, D→KS0π+π- decay
We present the first measurement of the angle φ 3 of the unitarity triangle using a model-independent Dalitz plot analysis of B ±→DK ±, D→KS0π +π - decays. The method uses, as input, measurements of the strong phase of the D→KS0π +π - amplitude from the CLEO Collaboration. The result is based on the full data set of 772×106 BB̄ pairs collected by the Belle experiment at the Υ(4S) resonance. We obtain φ 3=(77.3-14.9+15.1±4.1±4.3)° and the suppressed amplitude ratio r B=0.145±0.030±0. 010±0.011. Here the first error is statistical, the second is the experimental systematic uncertainty, and the third is the error due to the precision of the strong-phase parameters obtained by CLEO. © 2012 American Physical Society.