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
Amerio S.;Annovi A.;Bedeschi F.;Canelli F.;Cho K.;Ciocci M. A.;Corbo M.;Cordelli M.;Crescioli F.;Dell'orso M.;Di Canto A.;Donati S.;Giannetti P.;Glenzinski D.;Iori M.;Kondo K.;Lami S.;Leo S.;Liu H.;Moggi N.;Morello M. J.;Muller T.;Pauletta G.;Punzi G.;Ristori L.;Rodriguez T.;Ruffini F.;Rusu V.;Scuri F.;Tokar S.;Totaro P.;Vogel M.;Zhou C.;
2012-01-01
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.