B_s Mixing and B Hadron Lifetimes at CDF

TL;DR

This paper reports measurements of B_s mixing frequency and B hadron lifetimes using data from the CDF experiment, providing results that test the Standard Model and Heavy Quark Expansion predictions.

Contribution

The paper presents the first precise measurement of B_s mixing frequency and B hadron lifetimes at CDF, with results that challenge previous averages and support theoretical calculations.

Findings

m_s measured at 17.77 ps^{-1} with uncertainties.

 au(\u03b3_b) measured at 473.8  23.1  3.5 m.

m_s result consistent with Standard Model predictions.

Abstract

We present the CDF results using 1.0 fb^{-1} of data on the mixing frequency measurement in the B_s system and the lifetime measurements of several B hadrons. We obtain \Delta m_s=17.77 +- 0.1 +- 0.07 ps^{-1} and c\tau(\Lambda_b)=473.8 +- 23.1 +- 3.5 \mu m. The later one is more than 3 sigma above the world average, but in reasonable agreement with HQE calculations.