Charged-current events in the K2K near detectors

The K2K long baseline neutrino oscillation experiment is using the detectors near the neutrino production target to study neutrino interactions on nuclei. We present preliminary results for charged current interactions. In our data we observe a deficit of muons in the forward direction, which also corresponds to a deficit of events with low q2. We also present the preliminary results of the analysis of axial vector mass parameter using the shape of the q2 distribution observed by the Scintillating Fiber detector.