Measurement Of The Branching Fraction Bs Ds Ds Using The D0 Detector At Fermilab

Measurement of the Branching Fraction Bs-]Ds(*)Ds(*) Using the D0 Detector at Fermilab

This thesis describes a measurement of the branching fraction Br(B°{sub s} → D{sup (*)}{sub s} D{sup (*)}{sub s}) made using a data sample collected from proton-antiproton collisions at a centre-of-mass energy of 1.96 TeV, corresponding to approximately 1.3 fb−1 of integrated luminosity collected in 2002--2006 by the D0 detector at the Fermilab Tevatron Collider. One D{sup (*)}{sub s} meson was partially reconstructed in the decay D{sub s} → [phi][mu][nu], and the other D{sup (*)}{sub s} meson was identified using the decay D{sub s} → [phi][pi] where no attempt was made to distinguish D{sub s} and D{sup *}{sub s} states. The resulting measurement is Br(B°{sub s} → D{sup (*)}{sub s} D{sup (*)}{sub s}) = 0.039{sup +0.019}{sub -0.017}(stat){sup +0.016}{sub -0.015}(syst). This was subsequently used to estimate the width difference [Delta][Gamma]{sup CP}{sub s} in the B°{sub s}-{anti B}°{sub s} system: [Delta][Gamma]{sup CP}{sub s}/[Gamma]{sub s} = 0.079{sup +0.038}{sub -0.035}(stat){sup +0.031}{sub 0.030}(syst), and is currently one of the most precise estimates of this quantity and consistent with the Standard Model.

High Energy Physics

Hadron Collider Physics 2005

This book gathers the proceedings of The Hadron Collider Physics Symposia (HCP) 2005, and reviews the state-of-the-art in the key physics directions of experimental hadron collider research. Topics include QCD physics, precision electroweak physics, c-, b-, and t-quark physics, physics beyond the Standard Model, and heavy ion physics. The present volume serves as a reference for everyone working in the field of accelerator-based high-energy physics.