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APS » Journals » Phys. Rev. D » Volume 71 » Issue 3
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Phys. Rev. D 71, 032005 (2005) [30 pages]

Time-integrated and time-dependent angular analyses of B→J/ψKπ: A measurement of cos⁡2β with no sign ambiguity from strong phases

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B. Aubert et al.
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Received 2 November 2004; published 22 February 2005

We present results on B→J/ψKπ decays using e+e-annihilation data collected with the BABAR detector at the Υ(4S) resonance. The detector is located at the PEP-II asymmetric-energy storage ring facility at the Stanford Linear Accelerator Center. Using approximately 88×106 BB̅ 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 cos⁡2β using the angular and time-dependent asymmetry in B→J/ψK*0(KS0π0) decays. With sin⁡2β fixed at its measured value and cos⁡2β treated as an independent parameter, we find cos⁡2β=2.72-0.79+0.50(stat)±0.27(syst), determining the sign of cos⁡2β to be positive at 86% C.L.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.71.032005
DOI:
10.1103/PhysRevD.71.032005
PACS:
13.25.Hw, 12.15.Hh, 14.40.Nd, 11.30.Er
 
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