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 → ve+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.

New results on a search for a 33.9 MeV/c2 neutral particle from pi+ decay in the NOMAD experiment / P., A., D., A., A., B., M., B., M., B., G., B., K., B., N., B., I., B., B., B., F., B., J., B., S., B., A., B., S., B., L., C., A., C., P. W., C., V., C., A., C., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - ELETTRONICO. - 527:1-2(2002), pp. 23-28. [10.1016/S0370-2693(01)01486-1]

New results on a search for a 33.9 MeV/c2 neutral particle from pi+ decay in the NOMAD experiment

P. Zuccon
2002-01-01

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 → ve+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.
2002
1-2
P., Astier; D., Autiero; A., Baldisseri; M., Baldo-Ceolin; M., Banner; G., Bassompierre; K., Benslama; N., Besson; I., Bird; B., Blumenfeld; F., Bobis...espandi
New results on a search for a 33.9 MeV/c2 neutral particle from pi+ decay in the NOMAD experiment / P., A., D., A., A., B., M., B., M., B., G., B., K., B., N., B., I., B., B., B., F., B., J., B., S., B., A., B., S., B., L., C., A., C., P. W., C., V., C., A., C., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - ELETTRONICO. - 527:1-2(2002), pp. 23-28. [10.1016/S0370-2693(01)01486-1]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/197389
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