We present a measurement of the decay amplitudes in B→J/ψK*(892) channels using 20.7 fb-1 of data collected at the ϒ(4S) resonance with the BABAR detector at PEP-II. We measure a P-wave fraction R⊥ = (16.0±3.2±1.4)% and a longitudinal polarization fraction (59.7±2.8±2.4)%. The measurement of a relative phase that is neither 0 nor π, φ∥ = 2.50±0.20±0.08 radians, favors a departure from the factorization hypothesis. Although the decay B→J/ψKπ proceeds mainly via K*(892), there is also evidence for K2*(1430) and Kπ S-wave contributions.
Measurement of the B → J/ψK*(892) Decay Amplitudes
MARGONI, MARTINO;SIMONETTO, FRANCO;STROILI, ROBERTO;SIMI, GABRIELE;
2001
Abstract
We present a measurement of the decay amplitudes in B→J/ψK*(892) channels using 20.7 fb-1 of data collected at the ϒ(4S) resonance with the BABAR detector at PEP-II. We measure a P-wave fraction R⊥ = (16.0±3.2±1.4)% and a longitudinal polarization fraction (59.7±2.8±2.4)%. The measurement of a relative phase that is neither 0 nor π, φ∥ = 2.50±0.20±0.08 radians, favors a departure from the factorization hypothesis. Although the decay B→J/ψKπ proceeds mainly via K*(892), there is also evidence for K2*(1430) and Kπ S-wave contributions.File in questo prodotto:
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