First measurement of phi₃ with a binned model-independent Dalitz plot analysis of B->DK, D->Ks pi+pi- decay

2011/06/20 by I. Adachi, Belle Collaboration, K. Adamczyk +4
Physics and Astronomy · #Nuclear physics research studies #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex

paper · pdf · doi:10.48550/arxiv.1106.4046

14 pages, 9 figures, 5 tables. Contributed to XLVI Rencontres de Moriond, Electroweak Interactions and Unified Theories (13--20 March 2011, La Thuile, Italy)

arxiv created 2011/06/20 · arxiv updated 2011/06/22

Abstract

We present the first measurement of the angle phi₃ of the unitarity triangle using a binned model-independent Dalitz plot analysis technique of B->DK, D->Ks pi+pi- decay chain. The method is based on the measurement of parameters related to the strong phase of D->Ks pi+ pi- amplitude performed by the CLEO collaboration. The analysis uses full data set of 772x10⁶ BBbar pairs collected by the Belle experiment at Upsilon(4S) resonance. We obtain phi3 = (77.3^+15.1_-14.9 +- 4.2 +- 4.3) degree and the suppressed amplitude ratio rB = 0.145 +- 0.030 +- 0.011 +- 0.011. Here the first error is statistical, the second is experimental systematic uncertainty, and the third is the error due to precision of strong phase parameters obtained by CLEO. This result is preliminary.

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