First Observation ofB¯s0→Ds±K∓and Measurement of the Ratio of Branching FractionsB(B¯s0→Ds±K∓)/B(B¯s0→Ds+π−)

2008/08/30 by CDF Collaboration, T. Aaltonen, J. Adelman +99
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex

paper · pdf · doi:10.1103/physrevlett.103.191802

published as Phys.Rev.Lett.103:191802,2009 · Submitted to Phys. Rev. Lett

arxiv created 2008/08/30 · openalex publication_date 2009/11/03 · arxiv updated 2010/05/12 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/01

Abstract

A combined mass and particle identification fit is used to make the first observation of the decay B_s⁰\ensuremath→D_s^\ifmmode±\else\textpm\fiK^\ensuremath∓ and measure the branching fraction of B_s⁰\ensuremath→D_s^\ifmmode±\else\textpm\fiK^\ensuremath∓ relative to B_s⁰\ensuremath→D_s⁺\ensuremathπ^\ensuremath-. This analysis uses 1.2 fb^\ensuremath-1 integrated luminosity of pp collisions at √(s)=1.96 TeV collected with the CDF II detector at the Fermilab Tevatron collider. We observe a B_s⁰\ensuremath→D_s^\ifmmode±\else\textpm\fiK^\ensuremath∓ signal with a statistical significance of 8.1\ensuremathσ and measure B(B_s⁰\ensuremath→D_s^\ifmmode±\else\textpm\fiK^\ensuremath∓)/B(B_s⁰\ensuremath→D_s⁺\ensuremathπ^\ensuremath-)=0.097\ifmmode±\else\textpm\fi0.018(stat)\ifmmode±\else\textpm\fi0.009(syst).

Citations

• Review of Particle Physics
• CP violation and the CKM matrix: assessing the impact of the asymmetric B factories
• Bs-B¯smixing,CPviolation, and extraction of CKM phases from untaggedBsdata samples