We report a measurement of the bottom-strange meson mixing phase β s using the time evolution of Bs0âJ/ Ï(âμ +μ -)(âK +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 âs=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 ÎÎ s and measure β s [-Ï/2,-1.51] [-0.06,0.30] [1.26,Ï/2] at the 68% confidence level, in agreement with the standard model expectation. Assuming the standard model value of β s, we also determine ÎÎ s=0.068±0. 026(stat)±0.009(syst)ps -1 and the mean Bs0 lifetime Ï 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;
2012-01-01
Abstract
We report a measurement of the bottom-strange meson mixing phase β s using the time evolution of Bs0âJ/ Ï(âμ +μ -)(âK +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 âs=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 ÎÎ s and measure β s [-Ï/2,-1.51] [-0.06,0.30] [1.26,Ï/2] at the 68% confidence level, in agreement with the standard model expectation. Assuming the standard model value of β s, we also determine ÎÎ s=0.068±0. 026(stat)±0.009(syst)ps -1 and the mean Bs0 lifetime Ï 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.