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EnglishWe report on a search for heavy neutrinos (upsilon (4)) produced in the decay D-s --> tau upsilon (4) at the SPS proton target followed by the decay upsilon (4) --> upsilon (tau)e(+)e(-) in the NOMAD detector. Both decays are expected to occur if upsilon (4) is a component of upsilon (tau). 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. This allows to derive an upper limit on the mixing strength between the heavy neutrino and the tau neutrino in the upsilon (4) mass range from 10 to 190 MeV. Windows between the SN1987a and Big Bang Nucleosynthesis lower limits and our result are still open fur future experimental searches. The results obtained are used to constrain an interpretation of the time anomaly observed in the KARMEN1 detector. (C) 2001 Published by Elsevier Science B.V. RI Vercesi, Valerio/C-6672-2008; Collazuol, Gianmaria/C-5670-2012; Soler, Paul/E-8464-2011; Moorhead, Gareth/B-6634-2009
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| Autori: | Astier P; Autiero D; Baldisseri A; Baldo-Ceolin M; Banner M; Bassompierre G; Benslama K; Besson N; Bird I; Blumenfeld B; Bobisut F; Bouchez J; Boyd S; Bueno A; Bunyatov S; Camilleri L; Cardini A; Cattaneo PW; Cavasinni V; Cervera-Villanueva A; Collazuol G; Conforto G; Conta C; Contalbrigo M; Cousins R; Daniels D; Degaudenzi H; Del Prete T; De Santo A; Dignan T; Di Lella L; Silva EDE; Donnelly IJ; Dumarchez J; Ellis M; Fazio T; Feldman GJ; Ferari R; Ferrere D; Flaminio V; Fraternali M; Gaillard JM; Gangler E; Geiser A; Geppert D; Gibin D; Gninenko SN; Godley A; Gonzalez-Garcia MC; Gomez-Cadenas JJ; Gosset J; Gossling C; Gouanere M; Grant A; Graziani G; Guglielmi A; Hagner C; Hernando J; Hubbard D; Hurst P; Hyett N; Iacopini E; Joseph C; Juget F; Kirsanov MM; Klimov O; Kokkonen J; Kovzelev AV; Krasnikov NV; Krasnoperov A; Lacaprara S; Lachaud C; Lakic B; Lanza A; La Rotonda L; Laveder M; Letessier-Selvon A; Levy JM; Linssen L; Ljubicic A; Long J; Lupi A; Marchionni A; Martelli F; Mechain X; Mendiburu JP; Meyer JP; Mezzetto M; Mishra SR; Moorhead GF; Naumov D; Nedelec P; Nefedov Y; Nguyen-Mau C; Orestano D; Pastore F; Peak LS; Pennacchio E; Pessard H; Petti R; Placci A; Polesello G; Pollmann D; Polyarush A; Popov B; Poulsen C; Rathouit P; Rico J; Roda C; Rubbia A; Salvatore F; Schahmaneche K; Schmidt B; Segneri G; Sevior M; Soler FJP; Sozzi G; Steele D; Stiegler U; Stipcevic M; Stolarczyk T; Tareb-Reyes M; Taylor GN; Tereshchenko V; Toropin AN; Touchard AM; Tovey SN; Tran MT; Tsesmelis E; Ulrichs J; Vacavant L; Valdata-Nappi M; Valuev V; Vannucci F; Varvell KE; Veltri M; Vercesi V; Vidal-Sitjes G; Vieira JM; Vinogradova T; Weber FV; Weisse T; Wilson FF; Winton LJ; Yabsley BD; Zaccone H; Zuber K; Zuccon P |
| Titolo: | Search for heavy neutrinos mixing with tau neutrinos |
| Anno del prodotto: | 2001 |
| Digital Object Identifier (DOI): | 10.1016/S0370-2693(01)00362-8 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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