Measurement of Nucleon Structure Functions in Neutrino Scattering

Abstract After completion of the data taking for the ν μ → ν τ oscillation search, the CHORUS lead–scintillator calorimeter was used in the 1998 run as an active target. High-statistics samples of charged-current interactions were collected in the CERN SPS west area neutrino beam. This beam contained predominantly muon (anti-)neutrinos from sign-selected pions and kaons. We measure the flux and energy spectrum of the incident neutrinos and compare them with beam simulations. The neutrino–nucleon and anti-neutrino–nucleon differential cross-sections are measured in the range 0.01 x 0.7 , 0.05 y 0.95 , 10 E ν 200 GeV . We extract the neutrino–nucleon structure functions F 2 ( x , Q 2 ) , x F 3 ( x , Q 2 ) , and R ( x , Q 2 ) and compare these with results from other experiments.