Measurement of the polarisation amplitudes in B0 -> J/psi K*(892)0 decays

Abstract

An analysis of the decay B0 -> J/psi K*(892)0 is presented using data, corresponding to an integrated luminosity of 1.0fb^-1, collected in pp collisions at a centre-of-mass energy of 7TeV with the LHCb detector. The polarisation amplitudes and the corresponding phases are measured to be |A_{\parallel}|^2 = 0.227 +- 0.004 (stat.) +- 0.011 (syst.), |A_{\perp}|^2 = 0.201 +- 0.004 (stat.) +- 0.008 (syst.), δ_{\parallel} [rad] = -2.94 +- 0.02 (stat.) +- 0.03 (syst.), δ_{\perp} [rad] = 2.94 +- 0.02 (stat.) +- 0.02 (syst.). Comparing B0 -> J/psi K*(892)0 and \bar{B}0 -> J/psi \bar{K}*(892)0 decays, no evidence for direct CP violation is found.

22 pages, 7 figures

References in corpus (3)

• PYTHIA 6.4 Physics and Manual
• Measurement of the $B_s^0\to J/\psi K^{\ast 0}$ branching fraction and angular amplitudes
• Flavor symmetry for strong phases and determination of ${\beta }_s,\Delta \Gamma$ in $B_s\to J/\psi \varphi$

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