2002/04/30 by The Belle Collaboration, K. Abe, I. Adachi +95 · 3 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.89.071801
published as Phys.Rev.Lett.89:071801,2002 · 9 pages, 2 figures, accepted for publication in Physical Review Letters
arxiv created 2002/07/03 · openalex publication_date 2002/07/26 · arxiv updated 2009/11/30 · openalex created_date 2021/01/18 · openalex updated_date 2026/07/30
We present a measurement of CP-violating asymmetries in B0\ensuremath→\ensuremathπ+\ensuremathπ^\ensuremath- decays based on a 41.8 fb^\ensuremath-1 data sample collected at the \ensuremathΥ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e^\ensuremath- collider. We fully reconstruct one neutral B meson as a B0\ensuremath→\ensuremathπ+\ensuremathπ^\ensuremath- CP eigenstate and identify the flavor of the accompanying B meson from its decay products. From the asymmetry in the distribution of the time intervals between the two B meson decay points, we obtain the CP-violating asymmetry parameters S_\ensuremathπ\ensuremathπ=\ensuremath-1.21_\ensuremath-0.27+0.38(stat)_\ensuremath-0.13+0.16(syst) and A_\ensuremathπ\ensuremathπ=+0.94_\ensuremath-0.31+0.25(stat)\ifmmode±\else\textpm\fi0.09(syst).