We report on a direct search in NOMAD for a new 33.9 MeV/c(2) neutral particle (X) produced in pion decay in flight, pi --> muX followed by the decay X --> nue(+)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 x 10(19) protons on target, a single candidate event consistent with background expectations was found. The search is sensitive to a pion branching ratio BR(pi --> muX) > 3.7 x 10(-15), significantly smaller than previous experimental limits.
New results on a search for a 33.9 MeV/c2 neutral particle from π+ decay in the NOMAD experiment
MARTELLI, FILIPPO;VELTRI, MICHELE;
2002
Abstract
We report on a direct search in NOMAD for a new 33.9 MeV/c(2) neutral particle (X) produced in pion decay in flight, pi --> muX followed by the decay X --> nue(+)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 x 10(19) protons on target, a single candidate event consistent with background expectations was found. The search is sensitive to a pion branching ratio BR(pi --> muX) > 3.7 x 10(-15), significantly smaller than previous experimental limits.File in questo prodotto:
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