CP asymmetries at D0

Abstract

Using two independent measurements of the semileptonic CP asymmetry in the $B_s$ system, we constrain the CP violating phase of the $B_s$ system to be ${\varphi }_s=-0.70_{-0.39}^{+0.47}$. The data sample corresponds to an integrated luminosity of 1.1 fb${}^{-1}$ accumulated with D0 detector at the Fermilab Tevatron collider. We also measure the direct CP violating asymmetry in the decay $B^{+}\to J/\psi K^{+}$ to be $A_{CP}(B^{+}\to J/\psi K^{+})=+0.0067\pm 0.0074$(stat)$\pm 0.0026$(syst). The data corresponds to an integrated luminosity of 1.6 fb${}^{-1}$.

contributed paper to EPS07, Manchester, UK, manuscript number EPSHEPP172

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• The Cosmological Parameters 2006
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• Measurement of the charge asymmetry in semileptonic Bs decays