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The Tokai-to-Kamioka (T2K) neutrino experiment measures neutrino oscillationsby using an almost pure muon neutrino beam produced at the J-PARC acceleratorfacility. The T2K muon monitor was installed to measure the direction andstability of the muon beam which is produced together with the muon neutrinobeam. The systematic error in the muon beam direction measurement wasestimated, using data and MC simulation, to be 0.28 mrad. During beamoperation, the proton beam has been controlled using measurements from the muonmonitor and the direction of the neutrino beam has been tuned to within 0.3mrad with respect to the designed beam-axis. In order to understand the muonbeam properties,measurement of the absolute muon yield at the muon monitor wasconducted with an emulsion detector. The number of muon tracks was measured tobe $(4.06\pm0.05)\times10^4$ cm$^{-2}$ normalized with $4\times10^{11}$ protonson target with 250 kA horn operation. The result is in agreement with theprediction which is corrected based on hadron production data.

Measurement of the muon beam direction and muon flux for the T2K neutrino experiment