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Measurement of polarization amplitudes and CP asymmetries in $B^0 \to \phi K^*(892)^0$

Abstract : An angular analysis of the decay $B^0 \to \phi K^*(892)^0$ is reported based on a $pp$ collision data sample, corresponding to an integrated luminosity of 1.0 fb$^{-1}$, collected at a centre-of-mass energy of $\sqrt{s} = 7$ TeV with the LHCb detector. The P-wave amplitudes and phases are measured with a greater precision than by previous experiments, and confirm about equal amounts of longitudinal and transverse polarization. The S-wave $K^+ \pi^-$ and $K^+K^-$ contributions are taken into account and found to be significant. A comparison of the $B^0 \to \phi K^*(892)^0$ and $\bar{B}^0 \to \phi \bar{K}^*(892)^0$ results shows no evidence for direct CP violation in the rate asymmetry, in the triple-product asymmetries or in the polarization amplitudes and phases.
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Contributor : Sabine Starita <>
Submitted on : Friday, June 20, 2014 - 12:04:34 PM
Last modification on : Wednesday, September 16, 2020 - 4:26:43 PM

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R. Aaij, Y. Amhis, S. Barsuk, M. Borsato, O. Callot, et al.. Measurement of polarization amplitudes and CP asymmetries in $B^0 \to \phi K^*(892)^0$. Journal of High Energy Physics, Springer, 2014, 5, pp.069. ⟨10.1007/JHEP05(2014)069⟩. ⟨in2p3-01010695⟩



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