1. Study of neutrino-induced dimuon events in gargamelle at CERN-SPS
- Author
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B. Pattison, S. Natali, G. Carnesecchi, M. Willutzky, S. Ragazzi, D. Blum, C. Pascaud, N. Armenise, A. Pullia, P. Alibran, J. Bourotte, J. Gillespie, P. Lundborg, Donatella Cavalli, H. Sletten, E. Bellotti, J.P. Vialle, Ph. Heusse, F. Romano, S. Bonetti, M. Haguenauer, A.M. Lutz, B. Degrange, H. Burmeister, L. Zanotti, Gilbert Poulard, O. Erriquez, F. Jacquet, J. Sleeman, C. Matteuzzi, M. Rollier, G. Conforto, C. Longuemare, G. Bonneaud, P. Musset, A. Blondel, U. Nguyen-Khac, M.T. Fogli-Muciaccia, Salvatore Nuzzo, Heyd, Yvette, Institut de Recherches Subatomiques (IReS), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Physics ,Semileptonic decay ,Nuclear and High Energy Physics ,Particle physics ,Missing energy ,Meson ,[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex] ,Hadron ,Elementary particle ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,Nuclear physics ,Particle decay ,Gargamelle ,Neutrino ,Particle Physics - Experiment - Abstract
This letter reports a study of 117 opposite-sign and 41 like-sign dimuons, in a wide-band neutrino exposure of Gargamelle at CERN SPS. No signal is found in the μ − μ − channel. The μ − μ + channel is found to be dominated by D-meson production and decay. There is evidence in these events for missing energy which may be interpreted as an unseen neutrino. The V 0 multiplicities, K 0 /event=0.53 −0.20 +0.25 and Λ /event=0.03 −0.04 +0.06 show only evidence for charmed meson production. Information on the D-meson fragmentation function is presented. In a specific model, a rate σ (μ − μ + ) σ(μ − ) =(0.72±0.14×10 −2 is found, independent of the energy. An investigation of these events for visible D-decays sets a limit on the life-time τ D −12 s at 90% C.L.
- Published
- 1979