2004/05/25 by B. Aubert, R. Barate, BABAR Collaboration +98 · 1 citation
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.93.091802
published as Phys.Rev.Lett.93:091802,2004 · 7 pages, 3 postscript figures, submitted to Physical Review Letters
arxiv created 2004/05/25 · openalex publication_date 2004/08/25 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/04
We establish upper limits on branching fractions for B0 decays to final states where the decay products are purely invisible (i.e., no observable final state particles) and for B0 decays to \ensuremathν\ensuremathν\ensuremathγ. Within the standard model, these decays have branching fractions that are below current experimental sensitivity, but various models of physics beyond the standard model predict significant contributions from these channels. Using 88.5\ifmmode×\else\texttimes\fi106 BB pairs collected at the \ensuremathΥ(4S) resonance by the BABAR experiment at the PEP-II e+e^\ensuremath- storage ring at the Stanford Linear Accelerator Center, we establish upper limits at the 90% confidence level of 22\ifmmode×\else\texttimes\fi10^\ensuremath-5 for the branching fraction of B0\ensuremath→invisible and 4.7\ifmmode×\else\texttimes\fi10^\ensuremath-5 for the branching fraction of B0\ensuremath→\ensuremathν\ensuremathν\ensuremathγ.