Journal article

Time-integrated and time-dependent angular analyses of B -> J/psi K pi: A measurement of cos2 beta with no sign ambiguity from strong phases

B Aubert, R Barate, D Boutigny, F Couderc, JM Gaillard, Y Karyotakis, JP Lees, V Poireau, V Tisserand, A Zghiche, A Palano, A Pompili, JC Chen, ND Qi, G Rong, P Wang, YS Zhu, G Eigen, I Ofte, B Stugu Show all

Physical Review D | AMER PHYSICAL SOC | Published : 2005

Abstract

We present results on B → J/ψKπ decays using e e annihilation data collected with the BABAR detector at the Y(4S) resonance. The detector is located at the PEP-II asymmetric-energy storage ring facility at the Stanford Linear Accelerator Center. Using approximately 88 × 10 BB̄ pairs, we measure the decay amplitudes for the flavor eigenmodes and observe strong-phase differences indicative of final-state interactions with a significance of 7.6 standard deviations. We use the interference between the Kπ S-wave and P-wave amplitudes in the region of the K*(892) to resolve the ambiguity in the determination of these strong phases. We then perform an ambiguity-free measurement of cos2β using th..

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