/ Experiment-HEP hep-ex/9804003


Search for a new gauge boson in pi0 decays


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, Barry J. ; 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.M. ; 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.N. ; Gomez-Cadenas, J.J. ; 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. ; Kekez, D. ; Khomenko, B. ; Kirsanov, M.M. ; Klimov, O. ; Kokkonen, J. ; Kovzelev, A.V. ; Kuznetsov, V. ; 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.E. ; Sillou, D. ; Soler, F.J.P. ; Sozzi, G. ; Steele, D. ; Steffen, P. ; Steininger, M. ; Stiegler, U. ; Stipcevic, M. ; Stolarczyk, T. ; Tareb-Reyes, M. ; Taylor, G.N. ; Tereshchenko, S. ; Toropin, A.N. ; 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.A. ; Weber, F. ; Weisse, T. ; Werlen, M. ; Wilson, F. ; Winton, L.J. ; Yabsley, Bruce D. ; Zaccone, H. ; Zuber, K.

Published in: Phys.Lett.
Year: 1998
Vol.: B428
Page No: 197-205
Pages: 15

Abstract: A search was made for a new light gauge boson $X$ which might be produced in $\pi^{0}\to\gamma + X$ decay from neutral pions generated by 450-GeV protons in the CERN SPS neutrino target. The X's would penetrate the downstream shielding and be observed in the NOMAD detector via the Primakoff effect, in the process of $X \to\pi^{0}$ conversion in the external Coulomb field of a nucleus. With $1.45\times10^{18}$ 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 expectation of 18.1$\pm$2.8 background events from standard neutrino processes. A new 90% C.L. upper limit on the branching ratio $Br(\pi^{0}\to\gamma + X)< (3.3 to 1.9) \times10^{-5}$ for $X$ masses ranging from 0 to 120 MeV/c^2 is obtained.

Web-Page: http://weblib.cern.ch/abstract?CERN-EP-98-047; http://dx.doi.org/10.1016/S0370-2693(98)00402-X; http://pdglive.lbl.gov/REFERENCE_info1.brl?slacrpp=PHLTA,B428,197; http://www.sciencedirect.com/science?_ob=GatewayURL&_origin=SPIRES&_method=citationSearch&_volkey=03702693%23428%23197%23&_version=1&md5=bb3427ca96d7d9d53c816244fda4dd92

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