Title of article
New results on a search for a 33.9 MeV/c2 neutral particle from π+ decay in the NOMAD experiment
Author/Authors
NOMAD Collaboration، نويسنده , , P Astier، نويسنده , , D Autiero، نويسنده , , A. Baldisseri، نويسنده , , M. Baldo-Ceolin، نويسنده , , M Banner، نويسنده , , G Bassompierre، نويسنده , , K Benslama، نويسنده , , N Besson، نويسنده , , I Bird، نويسنده , , B Blumenfeld، نويسنده , , F. Bobisut، نويسنده , , J Bouchez، نويسنده , , S Boyd، نويسنده , , A Bueno، نويسنده , , S Bunyatov، نويسنده , , L Camilleri، نويسنده , , A Cardini، نويسنده , , P.W. Cattaneo، نويسنده , , V Cavasinni، نويسنده , , et al.، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2002
Pages
6
From page
23
To page
28
Abstract
We report on a direct search in NOMAD for a new 33.9 MeV/c2 neutral particle (X) produced in pion decay in flight, π→μX followed by the decay X→νe+e−. Both decays are postulated to occur to explain the time anomaly observed by the KARMEN experiment. From the analysis of the data collected during the 1996–1998 runs with 4.1×1019 protons on target, a single candidate event consistent with background expectations was found. The search is sensitive to a pion branching ratio BR(π→μX)>3.7×10−15, significantly smaller than previous experimental limits.
Keywords
Neutrino mixing , Neutrino decay
Journal title
PHYSICS LETTERS B
Serial Year
2002
Journal title
PHYSICS LETTERS B
Record number
915238
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