Cross sections for neutrino production of charmed particles

Abstract

We have found 122 charmed-particle decays among 3855 neutrino interactions located in the fiducial volume of a hybrid emulsion spectrometer installed in the Fermilab wide-band neutrino beam. We obtain an average relative charmed-particle production cross section of σ(ν μ→ cμ −) σ(ν μ→μ −) =4.9 −0.6 +0.7% , at an average neutrino energy of 22 GeV. We also obtain a production rate of σ(ν μ→ c c ν μ) σ(ν μ→ν μ) =0.13 −0.11 +0.31% , if we assume that there was an undetected muon, a limit of σ(ν μ→ c cμ −) σ(ν μ→ cμ − )<3% (90% CL) can be obtained. Other cross section ratios and limits are also presented.