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First Flavor-Tagged Determination of Bounds on Mixing-Induced CP Violation in Bs0 -> J/ψϕ Decays

CollaborationWith : Clark, Allan Geoffrey / Hamilton, Andrew / Lefevre, Régis / Sfyrla, Anna / Shreyber, Irina / Vallecorsa, Sofia / Wu, Xin
Published in Physical Review Letters. 2008, vol. 100, no. 16, p. 161802
Abstract This Letter describes the first determination of bounds on the CP-violation parameter 2βs using B0s decays in which the flavor of the bottom meson at production is identified. The result is based on approximately 2000 B0s→J/ψϕ decays reconstructed in a 1.35  fb−1 data sample collected with the CDF II detector using pp¯ collisions produced at the Fermilab Tevatron. We report confidence regions in the two-dimensional space of 2βs and the decay-width difference ΔΓ. Assuming the standard model predictions of 2βs and ΔΓ, the probability of a deviation as large as the level of the observed data is 15%, corresponding to 1.5 Gaussian standard deviations.
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CDF COLLABORATION. First Flavor-Tagged Determination of Bounds on Mixing-Induced CP Violation in Bs0 -> J/ψϕ Decays. In: Physical Review Letters, 2008, vol. 100, n° 16, p. 161802. https://archive-ouverte.unige.ch/unige:38506

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Deposited on : 2014-07-07

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