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Measurement of the polarization 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.), \delta_{\parallel} [rad] = -2.94 +- 0.02 (stat.) +- 0.03 (syst.), \delta_{\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.
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http://hal.in2p3.fr/in2p3-00844565
Contributor : Sabine Starita <>
Submitted on : Monday, July 15, 2013 - 3:04:54 PM
Last modification on : Wednesday, September 16, 2020 - 4:22:21 PM

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R. Aaij, Y. Amhis, S. Barsuk, O. Callot, J. He, et al.. Measurement of the polarization amplitudes in B0 -> J/psi K*(892)0 decays. Physical Review D, American Physical Society, 2013, 88, pp.052002. ⟨10.1103/PhysRevD.88.052002⟩. ⟨in2p3-00844565⟩

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