Muon Range Detector   -- Fe event analysis --

Official plots accepted in K2K Collaboration meeting on Dec. 01, 2001.

MRD event rate summary and SK expect

Fiducial = radius<3m, 1-3rd iron (73ton), Nlayer>=2.

## NOTICE ##   Up-dated spectrum error, based on 25% (75%) uncertainties at 0.5-1(0-0.5)GeV bin.

  • [summary table 2001 (PostScript)]
  • [summary table 1999-2000 (PostScript)]

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    MRD event rate stability

  • [rate stability from Jun'99 to Jul'01 normalized to CT (1-9th iron, Nlayer>=1, every 12hours)]
  • [rate stability from Jun'99 to Jul'01 normalized to CT (1-9th iron, Nlayer>=1, every 2days)]
  • [rate stability from Jun'99(Nov'99) to Jul'01 normalized to Mumon(silicon) (1-9th iron Nlayer>=1)].

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    Neutrino profile at MRD

    Fiducial = all of 1-9th iron, Nlayer>=1.
    Acceptance correction and target mass correction is already applyed.
    ## NOTICE ##   SK direction is (x=0cm, y=-15.8cm) in these plots.
     
  • merged DATA profile 2000(Nov'99-Jun'00) and 2001(Jan'01-Jul'01), [profile (blue:2000 red:2001)].
  • [Stability of profile center],  fitted gaussian center, plotted on every 5 days.
  • [Stability of profile width],  fitted gaussian width, plotted on every 5 days.

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    Muon energy spectrum and angular distribution stability

    Fiducial = radius<3m, 1-9th iron, Nlayer>=1.
     
  • Stability of [energy] and [angle], monthly variation.
  • Comparison between 2000(blue: Nov'99-Jun'00) and 2001(red: Jan'01-Jul'01), regarding [energy] and [angle].

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    Comparison between Data and MC

    Fiducial = radius<3m, 1-3rd iron, Nlayer>=2.
    Red points show data. The error bar of the data is a quadratic sum of the statistic error and the systematic error.
    The systematic error is estimated from the energy-scale error of 1.7% at maximum.
    Histogram shows MC(Neut4.3 with the proton rescattering taken into account) with the MC statistic error.
     
  • Muon momentum distribution, [DATA(Nov99-July01) and MC].normalized by their entries.
  • Muon q^2 distribution, [DATA(Nov99-July01) and MC].normalized by their entries.
  • Muon angular(cos(theta)) distribution, [DATA(Nov99-july01) and MC].normalized by their entries.
  • Muon angular(theta) distribution, [DATA(Nov99-july01) and MC].normalized by their entries.

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    Last up-date:  Dec. 12, 2001.
    Send comments to MRD group,  ishii@neutrino.kek.jp, choi@neutrino.kek.jp and maruyama@neutrino.kek.jp.

    Fin.