# Measurement of the $B \rightarrow J/\psi K*(892)$ decay amplitudes

Abstract : We present a measurement of the decay amplitudes in B-->J/psi K^*(892) channels using 20.7 fb-1 of data collected at the Upsilon(4S) resonance with the BABAR detector at PEP-II. We measure a P-wave fraction R_perp = (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 pi, phi_ll = 2.50+/-0.20+/-0.08 radians, favors a departure from the factorization hypothesis. Although the decay B-->J/psi Kpi proceeds mainly via K^*(892), there is also evidence for K^*_2(1430) and Kpi S-wave contributions.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00011096
Contributor : Hélène Kerec Connect in order to contact the contributor
Submitted on : Tuesday, January 15, 2002 - 5:13:24 PM
Last modification on : Saturday, October 9, 2021 - 3:59:49 AM

### Citation

B. Aubert, D. Boutigny, J.M. Gaillard, A. Hicheur, Y. Karyotakis, et al.. Measurement of the $B \rightarrow J/\psi K*(892)$ decay amplitudes. Physical Review Letters, American Physical Society, 2001, 87, pp.241801. ⟨in2p3-00011096⟩

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