Measurements of Branching Fractions and Decay Amplitudes in B-> J/ψK^* decays

Abstract

The branching fractions and the decay amplitudes of B -> J/psi K^* decays are measured in a 29.4/fb data sample collected with the Belle detector at the KEKB electron-positron collider. The decay amplitudes of helicity states of the J/psi K^* system are determined from the full angular distribution of the final state particles in the transversity basis. The branching fractions are measured to be (1.29\pm0.05\pm0.13) \times 10^{-3} for neutral mesons and (1.28\pm0.07\pm0.14) \times 10^{-3} for charged mesons. The measured longitudinal and transverse (perpendicular to the transversity plane) amplitudes are |A_0|^2 = 0.62\pm0.02\pm0.03 and |A_{\perp}|^2 = 0.19\pm0.02\pm0.03, respectively. The value of |A_{\perp}|^2 shows that the CP even component dominates in the B^0 \to J/ψK^{*0}(K_Sπ^0) decay.

17 pages, 3 figures, 5 tables, to appear in Phys. Lett. B

References in corpus (3)

• Observation of Large CP Violation in the Neutral B Meson System
• Measurement of branching fractions for exclusive B decays to charmonium final states
• Measurement of the B-->J/psi K^*(892) decay amplitudes

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