2003/08/31 by The BABAR Collaboration, R. Barate, B. Aubert +98 · 2 citations
Physics and Astronomy · #Neutrino Physics Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex
paper · pdf · doi:10.1103/physrevlett.92.251801
published as Phys.Rev.Lett.92:251801,2004 · 7 pages, 4 postscript figures, upload PRL version: no change in content
openalex publication_date 2004/06/22 · arxiv created 2004/08/20 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/04
We present a measurement of CP-violating asymmetries in fully reconstructed B0\ensuremath→D^(*)\ifmmode±\else\textpm\fi\ensuremathπ^\ensuremath∓ decays in approximately 88\ifmmode×\else\texttimes\fi106 \ensuremathΥ(4S)\ensuremath→BB decays collected with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. From a time-dependent maximum-likelihood fit we obtain the following for the CP-violating parameters: a=\ensuremath-0.022\ifmmode±\else\textpm\fi0.038 (stat)\ifmmode±\else\textpm\fi0.020 (syst), a*=\ensuremath-0.068\ifmmode±\else\textpm\fi0.038 (stat)\ifmmode±\else\textpm\fi0.020 (syst), clep=+0.025\ifmmode±\else\textpm\fi0.068 (stat)\ifmmode±\else\textpm\fi0.033 (syst), and clep*=+0.031\ifmmode±\else\textpm\fi0.070 (stat)\ifmmode±\else\textpm\fi0.033 (syst). Using other measurements and theoretical assumptions we interpret the results in terms of the angles of the Cabibbo-Kobayashi-Maskawa unitarity triangle, and find |sin(2\ensuremathβ+\ensuremathγ)|>0.69 at 68% confidence level. We exclude the hypothesis of no CP violation [sin(2\ensuremathβ+\ensuremathγ)=0] at 83% confidence level.