Abstract
During the years 1994–1997, the emulsion target of the CHORUS detector was exposed to the CERN-SPS Wide Band Neutrino Beam. The improvements of the past few years in the automatic emulsion scanning systems allowed a sample of events located in emulsion to be used for studies of charm production. Based on a sample of 56172νμ charged-current interactions analysed so far, we find a value of Bμ=0.093±0.009(stat.)±0.009(syst.) for the semi-leptonic branching fraction of charm hadrons. The result for events with visible energy larger than 30 GeV, Bμ=0.102±0.016(stat.)±0.010(syst.), can be combined with the existing measurements of the dimuon rate to yield a value of 0.219±0.022 for the magnitude of the Cabibbo–Kobayashi–Maskawa matrix element |Vcd|.
Highlights
Forschung under contract numbers 05 6BU11P and 05 7MS12P. 5 Fonds voor Wetenschappelijk Onderzoek, Belgium. 6 at CERN, 1211 Geneva 23, Switzerland. 7 Fonds National de la Recherche Scientifique, Belgium. 8 On leave of absence from ITEP, Moscow. 9 On leave of absence from St
Charm production in neutrino charged-current interactions has been studied in several experiments, in particular, CDHS [1], CCFR [2], CHARM [3], CHARM-II [4], NOMAD [5] and NuTeV [6] by means of electronic detectors and through the analysis of dimuon events
The overall normalization of the charm production rate in terms of the dimuon rate is given by the average semi-leptonic branching fraction, defined as the weighted average of the semileptonic branching fraction for individual charmed hadron species with the corresponding fragmentation fractions as weights
Summary
PII: S 0 3 7 0 - 2 6 9 3 ( 0 2 ) 0 2 8 6 5 - 4. Utsunomiya University, Utsunomiya, Japan Received 8 October 2002; accepted 16 October 2002
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