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

6533b82bfe1ef96bd128e379

RESEARCH PRODUCT

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

T. Weisse J.-p. Mendiburu K. Benslama H. Zaccone Alessandro Cardini H. Pessard Marco Fraternali P. Rathouit C. Joseph Fr Pastore B. A. Popov B. A. Popov P. Hurst V. Flaminio M. T. Tran C. Lachaud F. J. P. Soler F. J. P. Soler L. Di Lella Giacomo Graziani G. Bassompierre S. Boyd M. Valdata-nappi M. Valdata-nappi Marco Laveder J.m. Gaillard Roberto Ferrari B. Lakić G. N. Taylor D. Steele D. Steele E. Gangler E. Gangler J. Dumarchez M. C. Gonzalez-garcia K. Schahmaneche F. Juget J. A. Hernando Malcolm Ellis M. Kirsanov Th. Stolarczyk A.-m. Touchard O. Klimov R. Cousins Bruce Yabsley J.j. Gómez-cadenas J.j. Gómez-cadenas X. Méchain J. Rico A. Marchionni J.-m. Vieira Valerio Vercesi A. Cervera-villanueva A. Cervera-villanueva M. E. Sevior Dmitry V. Naumov Kevin Varvell C. Nguyen-mau A. Placci L. Camilleri R. Petti Stefano Lacaprara A. Kovzelev Fergus Wilson T. Del Prete Caroline Poulsen E. Do Couto E Silva F. Salvatore Vyacheslav Valuev Vyacheslav Valuev A. De Santo E. Pennacchio N. Hyett S.a. Bunyatov J. Bouchez F. Vannucci M. Gouanère H. Degaudenzi G. J. Feldman J-p. Meyer S. N. Tovey I. Bird I. Bird A. Lupi G. F. Moorhead A. Grant D. Hubbard P. Zuccon J.-m. Levy G. Collazuol Mario Stipčević Didier Ferrere G. Conforto Barry Blumenfeld L.j. Winton A. Baldisseri Claus Gößling J. Kokkonen G. Vidal-sitjes G. Vidal-sitjes Sergei Gninenko Sergei Gninenko A. Krasnoperov A. Krasnoperov P. Nédélec M. Mezzetto T. Vinogradova Nathalie Besson D. Sillou J. Ulrichs Kai Zuber E. Tsesmelis Caren Hagner T. Fazio André Rubbia André Rubbia A. Godley G. Sozzi A. Guglielmi S.r. Mishra S.r. Mishra Chiara Roda Chiara Roda L. Linssen D. Pollmann E. Iacopini P. Astier D. Autiero F.v. Weber F.v. Weber A. Letessier-selvon D. Daniels Giacomo Polesello M. Tareb-reyes Vincenzo Cavasinni J. Long Domizia Orestano F. Martelli M. Contalbrigo T. Dignan U. Stiegler A. Lanza J. Gosset D. Gibin A. Polyarush Achim Geiser Achim Geiser L. S. Peak M. Veltri Antonio Bueno Antonio Bueno A. N. Toropin L. La Rotonda M. Baldo-ceolin M. Banner D. Geppert P.w. Cattaneo Ante Ljubičić F. Bobisut N.v. Krasnikov C. Conta B. Schmidt B. Schmidt Yu. Nefedov L. Vacavant V. Tereshchenko

subject

Physics Nuclear and High Energy Physics Particle physics Neutrino decay; Neutrino mixing; Nuclear and High Energy Physics Branching fraction Neutrino mixing; Neutrino decay Nuclear physics Pion Pi Direct search Neutrino mixing Anomaly (physics)Neutral particle Event (particle physics)Neutrino decay KARMEN

description

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-->mu_X followed by the decay X -->nu e^+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 4.1×10^19 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 >3.7×10^-15, significantly smaller than previous experimental limits.

year	journal	country	edition	language
2002-02-01	Physics Letters B

https://doi.org/10.1016/s0370-2693(01)01486-1