2009/06/30 by The BABAR Collaboration, B. Aubert, Y. Karyotakis +98 · 4 citations
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex
paper · pdf · doi:10.1103/physrevlett.103.181801
published as Phys.Rev.Lett.103:181801,2009
arxiv created 2009/10/30 · openalex publication_date 2009/10/30 · arxiv updated 2010/04/12 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/04
We search for a light Higgs boson A0 in the radiative decay \ensuremathΥ(3S)\ensuremath→\ensuremathγA0, A0\ensuremath→\ensuremathτ+\ensuremathτ^\ensuremath-, \ensuremathτ+\ensuremath→e+\ensuremathνe\ensuremathν_\ensuremathτ, or \ensuremathτ+\ensuremath→\ensuremathμ+\ensuremathν_\ensuremathμ\ensuremathν_\ensuremathτ. The data sample contains 122\ifmmode×\else\texttimes\fi106 \ensuremathΥ(3S) events recorded with the BABAR detector. We find no evidence for a narrow structure in the studied \ensuremathτ+\ensuremathτ^\ensuremath- invariant mass region of 4.03<m_\ensuremathτ+\ensuremathτ^\ensuremath-<10.10 GeV/c2. We exclude at the 90% confidence level (C.L.) a low-mass Higgs boson decaying to \ensuremathτ+\ensuremathτ^\ensuremath- with a product branching fraction B(\ensuremathΥ(3S)\ensuremath→\ensuremathγA0)\ifmmode×\else\texttimes\fiB(A0\ensuremath→\ensuremathτ+\ensuremathτ^\ensuremath-)>(1.5--16)\ifmmode×\else\texttimes\fi10^\ensuremath-5 across the m_\ensuremathτ+\ensuremathτ^\ensuremath- range. We also set a 90% C.L. upper limit on the \ensuremathτ+\ensuremathτ^\ensuremath- decay of the \ensuremathηb at B(\ensuremathηb\ensuremath→\ensuremathτ+\ensuremathτ^\ensuremath-)<8%.