We present results on B → J/ψKπ decays using e<sup>+</sup> e<sup>-</sup> 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<sup>6</sup> 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 the angular and time-dependent asymmetry in B → J/ψK* <sup>0</sup>(K<inf>S</inf><sup>0</sup>π<sup>0</sup>) decays. With sin2β fixed at its measured value and cos2β treated as an independent parameter, we find cos2β = 2.72<inf>-0.79</inf><sup>+0.50</sup>(stat) ± 0.27(syst), determining the sign of cos2β to be positive at 86% C.L. © 2005 The American Physical Society.

Aubert, B., Barate, R., Boutigny, D., Couderc, F., Gaillard, J., Karyotakis, Y., et al. (2005). Time-integrated and time-dependent angular analyses of B → J/ψKπ: A measurement of cos2β with no sign ambiguity from strong phases. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 71(3), 1-30 [10.1103/PhysRevD.71.032005].

Time-integrated and time-dependent angular analyses of B → J/ψKπ: A measurement of cos2β with no sign ambiguity from strong phases

PATRIGNANI, CLAUDIA;
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 × 106 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 the angular and time-dependent asymmetry in B → J/ψK* 0(KS0π0) decays. With sin2β fixed at its measured value and cos2β treated as an independent parameter, we find cos2β = 2.72-0.79+0.50(stat) ± 0.27(syst), determining the sign of cos2β to be positive at 86% C.L. © 2005 The American Physical Society.
2005
Aubert, B., Barate, R., Boutigny, D., Couderc, F., Gaillard, J., Karyotakis, Y., et al. (2005). Time-integrated and time-dependent angular analyses of B → J/ψKπ: A measurement of cos2β with no sign ambiguity from strong phases. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 71(3), 1-30 [10.1103/PhysRevD.71.032005].
Aubert, B; Barate, R.; Boutigny, D.; Couderc, F.; Gaillard, J.-M.; Karyotakis, Y.; Lees, J.P.; Poireau, V.; Tisserand, V.; Zghiche, A.; Palano, A.; Po...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/551982
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