We report a measurement of the bottom-strange meson mixing phase β s using the time evolution of Bs0→J/ ψ(→μ +μ -)(→K +K -) decays in which the quark-flavor content of the bottom-strange meson is identified at production. This measurement uses the full data set of proton-antiproton collisions at √s=1.96TeV collected by the Collider Detector experiment at the Fermilab Tevatron, corresponding to 9.6fb -1 of integrated luminosity. We report confidence regions in the two-dimensional space of β s and the Bs0 decay-width difference ΔΓ s and measure β s [-π/2,-1.51] [-0.06,0.30] [1.26,π/2] at the 68% confidence level, in agreement with the standard model expectation. Assuming the standard model value of β s, we also determine ΔΓ s=0.068±0. 026(stat)±0.009(syst)ps -1 and the mean Bs0 lifetime τ s=1.528±0.019(stat)±0.009(syst)ps, which are consistent and competitive with determinations by other experiments. © 2012 American Physical Society.

Measurement of the bottom-strange meson mixing phase in the full CDF data set

PAGLIARONE, Carmine Elvezio;PIACENTINO, Giovanni Maria;
2012

Abstract

We report a measurement of the bottom-strange meson mixing phase β s using the time evolution of Bs0→J/ ψ(→μ +μ -)(→K +K -) decays in which the quark-flavor content of the bottom-strange meson is identified at production. This measurement uses the full data set of proton-antiproton collisions at √s=1.96TeV collected by the Collider Detector experiment at the Fermilab Tevatron, corresponding to 9.6fb -1 of integrated luminosity. We report confidence regions in the two-dimensional space of β s and the Bs0 decay-width difference ΔΓ s and measure β s [-π/2,-1.51] [-0.06,0.30] [1.26,π/2] at the 68% confidence level, in agreement with the standard model expectation. Assuming the standard model value of β s, we also determine ΔΓ s=0.068±0. 026(stat)±0.009(syst)ps -1 and the mean Bs0 lifetime τ s=1.528±0.019(stat)±0.009(syst)ps, which are consistent and competitive with determinations by other experiments. © 2012 American Physical Society.
http://oai.aps.org/filefetch?identifier=10.1103/PhysRevLett.109.171802&component=fulltext&description=markup&format=xml
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11695/66893
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