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Search for a new gauge boson in pi(0) decays

Authors :
Altegoer, J.
Astier, P.
Autiero, D.
Baldisseri, A.
Baldo-Ceolin, M.
Ballocchi, G.
Banner, M.
Basa, S.
Bassompierre, G.
Benslama, K.
Besson, N.
Bird, I.
Blumenfeld, B.
Bobisut, F.
Bouchez, J.
Boyd, S.
Bueno, A.
Bunyatov, S.
Camilleri, L.
Cardini, A.
Castera, A.
Cattaneo, P.W.
Cavasinni, V.
Cervera-Villanueva, A.
Collazuol, G.
Conforto, G.
Conta, C.
Contalbrigo, M.
Cousins, R.
Daniels, D.
De Santo, A.
Del Prete, T.
Dignan, T.
Di Lella, L.
do Couto e Silva, E.
Donnelly, I.J.
Dumarchez, J.
Fazio, T.
Feldman, G.J.
Ferrari, R.
Ferrere, D.
Flaminio, V.
Fraternali, M.
Gaillard, J.M.
Galumian, P.
Gangler, E.
Geiser, A.
Geppert, D.
Gibin, D.
Gninenko, S.
Gomez-Cadenas, J.J.
Gosset, J.
Goessling, C.
Gouanere, M.
Grant, A.
Graziani, G.
Guglielmi, A.
Hagner, C.
Hernando, J.
Hubbard, D.
Hurst, P.
Hyett, N.
Iacopini, E.
Joseph, C.
Kekez, Dalibor
Khomenko, B.
Kirsanov, M.M.
Klimov, O.
Kokkonen, J.
Kovzelev, A.
Kuznetsov, V.E.
Lacaprara, S.
Lanza, A.
La Rotonda, L.
Laveder, M.
Letessier-Selvon, A.
Levy, J.M.
Linssen, L.
Ljubicic, A.
Long, J.
Lupi, A.
Manola-Poggioli, E.
Marchionni, A.
Martelli, F.
Mechain, X.
Mendiburu, J.-P.
Meyer, J.P.
Mezzetto, M.
Mishra, S.R.
Moorhead, G.F.
Mossuz, L.
Nedelec, P.
Nefedov, Yu.
Nguyen-Mau, C.
Orestano, D.
Pastore, F.
Peak, L.S.
Pennacchio, E.
Perroud, J.P.
Pessard, H.
Petti, R.
Placci, A.
Plothow-Besch, H.
Pluquet, A.
Polesello, G.
Pollmann, D.
Pope, B.G.
Popov, B.
Poulsen, C.
Rathouit, P.
Roda, C.
Rubbia, A.
Salvatore, F.
Scannicchio, D.
Schahmaneche, K.
Schmidt, B.
Sconza, A.
Serrano, M.
Sevior, M.
Sillou, D.
Soler, F.J.P.
Sozzi, G.
Steele, D.
Steffen, P.
Steininger, M.
Stiegler, U.
Stipčević, Mario
Stolarczyk, T.
Tareb-Reyes, M.
Taylor, G.N.
Tereshchenko, V.
Toropin, A.
Touchard, A.-M.
Tovey, S.N.
Tran, M.-T.
Tsesmelis, E.
Ulrichs, J.
Uros, V.
Valdata-Nappi, M.
Valuev, V.
Vannucci, F.
Varvell, K.E.
Veltri, M.
Vercesi, V.
Verkindt, D.
Vieira, J.M.
Vinogradova, T.
Vo, M.K.
Volkov, S.
Weber, F.V.
Weisse, T.
Werlen, M.
Wilson, F.F.
Winton, L.J.
Yabsley, B.D.
Zaccone, H.
Zuber, K.
Publication Year :
1998

Abstract

A search was made for a new light gauge boson X which might be produced in pi^0--gamma + X decay from neutral pions generated by 450-GeV protons in the CERN SPS neutrino target. Th e X's would penetrate the downstream shielding and be observed in the NOMAD detector via the Primakoff effect, in the process of X --pi^0 conversion in the external Coulomb field of a nucleus. With 1.45x10^18 protons on target, 20 candidate events with energy between 8 and 140 GeV were found from the analysis of neutrino data.This number is in agreement with the e xpectation of 18.1?2.8 background events from standard neutrino processes.A new 90 % ~C.L. upper limit on the branching ratio Br(?0?? + X) (3.3~to~1.9)?10-5 for X masses ranging from 0 to 120 MeV/c2 is obtained.

Subjects

Subjects :
Physics::Instrumentation and Detectors
High Energy Physics::Experiment
Nuclear Experiment

Details

Language :
English
Database :
OpenAIRE
Accession number :
edsair.57a035e5b1ae..67e8858b4feea9df93a2bafb9232e081

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