Measurement of the B-->J/psi K^*(892) decay amplitudes

Details Measurement of the B-->J/psi K^*(892) decay amplitudes Measurement of the B-->J/psi K^*(892) decay amplitudes

2001-07-20

arxiv.org/abs/hep-ex/0107049v1

Phys.Rev.Lett.87:241801,2001

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages, 3 figures, 4 tables, submitted to Physical Review Letters

Scientific paper

10.1103/PhysRevLett.87.241801

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.

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