Search for a new gauge boson in $\pi^{0}$ decays

6533b853fe1ef96bd12acc04

RESEARCH PRODUCT

Search for a new gauge boson in $\pi^{0}$ decays

J. Altegoer P. Astier D. Autiero A. Baldisseri M. Baldo-ceolin G. Ballocchi M. Banner S. Basa G. Bassompierre K. Benslama N. Besson I. Bird B. Blumenfeld F. Bobisut J. Bouchez S. Boyd A. Bueno S. Bunyatov L. Camilleri A. Cardini A. Castera P.w. Cattaneo V. Cavasinni A. Cervera-villanueva G.m. Collazuol G. Conforto C. Conta M. Contalbrigo R. Cousins D. Daniels A.de Santo T.del Prete T. Dignan L.di Lella E. Do Couto E Silva I.j. Donnelly J. Dumarchez T. Fazio G.j. Feldman R. Ferrari D. Ferrère V. Flaminio M. Fraternali J-m. Gaillard P. Galumian E. Gangler A. Geiser D. Geppert D. Gibin S.n. Gninenko J-j. Gomez-cadenas J. Gosset C. Gößling M. Gouanère A. Grant G. Graziani A. Guglielmi C. Hagner J. Hernando D. Hubbard P. Hurst N. Hyett E. Iacopini C. Joseph D. Kekez B. Khomenko M.m. Kirsanov O. Klimov J. Kokkonen A.v. Kovzelev V. Kuznetsov S. Lacaprara A. Lanza L. La Rotonda M. Laveder A. Letessier-selvon J-m. Levy L. Linssen A. Ljubičić J. Long A. Lupi E. Manola-poggioli A. Marchionni F. Martelli X. Méchain J-p. Mendiburu J-p. Meyer M. Mezzetto S.r. Mishra G.f. Moorhead L. Mossuz P. Nédélec Yu. Nefedov C. Nguyen-mau D. Orestano F. Pastore L.s. Peak E. Pennacchio J-p. Perroud H. Pessard R. Petti A. Placci H. Plothow-besch A. Pluquet G. Polesello D. Pollmann B.g. Pope B. Popov C. Poulsen P. Rathouit C. Roda A. Rubbia F. Salvatore D. Scannicchio K. Schahmaneche B. Schmidt A. Sconza M. Serrano M.e. Sevior D. Sillou F.j.p. Soler G. Sozzi D. Steele P. Steffen M. Steininger U. Stiegler M. Stipčević T. Stolarczyk M. Tareb-reyes G.n. Taylor S. Tereshchenko A.n. Toropin A-m. Touchard S.n. Tovey M-t. Tran E. Tsesmelis J. Ulrichs V. Uros M. Valdata-nappi V. Valuev F. Vannucci K.e. Varvell M. Veltri V. Vercesi D. Verkindt J-m. Vieira T. Vinogradova M-k. Vo S.a. Volkov F. Weber T. Weisse M. Werlen F. Wilson L.j. Winton B.d. Yabsley H. Zaccone K. Zuber

subject

Physics Nuclear and High Energy Physics Gauge boson Particle physics Large Hadron Collider Branching fraction Physics::Instrumentation and Detectors Astrophysics::High Energy Astrophysical Phenomena High Energy Physics::Phenomenology Física High Energy Physics - Experiment Pion Coulomb High Energy Physics::Experiment Neutrino Nuclear Experiment Primakoff effect Energy (signal processing)Particle Physics - Experiment

description

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.

year	journal	country	edition	language
1998-04-05

10.1016/s0370-2693(98)00402-x http://cds.cern.ch/record/352170