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. (C) 2002 Elsevier Science B.V. All rights reserved.

Astier, P., Autiero, D., Baldisseri, A., Baldo Ceolin, M., Banner, M., Bassompierre, G., et al. (2002). New results on a search for a 33.9 MeV/c(2) neutral particle from pi(+) decay in the NOMAD experiment RID B-6634-2009 RID C-6672-2008. PHYSICS LETTERS. SECTION B, 527(1-2), 23-28 [10.1016/S0370-2693(01)01486-1].

New results on a search for a 33.9 MeV/c(2) neutral particle from pi(+) decay in the NOMAD experiment RID B-6634-2009 RID C-6672-2008

ORESTANO, DOMIZIA;
2002-01-01

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. (C) 2002 Elsevier Science B.V. All rights reserved.
2002
Astier, P., Autiero, D., Baldisseri, A., Baldo Ceolin, M., Banner, M., Bassompierre, G., et al. (2002). New results on a search for a 33.9 MeV/c(2) neutral particle from pi(+) decay in the NOMAD experiment RID B-6634-2009 RID C-6672-2008. PHYSICS LETTERS. SECTION B, 527(1-2), 23-28 [10.1016/S0370-2693(01)01486-1].
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/119898
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 10
  • ???jsp.display-item.citation.isi??? 9
social impact