Muon Range Detector -- Fe event analysis --

Official plots accepted in K2K Collaboration meeting on Jun. 25, 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.

Systematic errors for SK expect, [latest estimation table].

[stability from Jun99 to Apr01 (1-9th iron Nlayer>=1)] and [stability from Jun99 to Apr01, upper: (1-9th iron, Nlayer>=2), lower: (1-3rd iron, Nlayer>=2)].

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.

Typical profile in Nov99, [profile x], [profile y].

merged DATA profile(Nov99-Apr01), overlayed with MC, [profile (Low E and High E)].

merged DATA profile(Nov99-Jun00) vs (01Jan-01Apr), [profile (blue:2000 red:2001)].

[Stability of profile center], fitted with gaussian center, plotted on every 5 days.

Muon energy spectrum and angular distribution

Fiducial = radius<3m, 1-3rd iron, Nlayer>=2, for stability plot 1-9th iron, Nlayer>=1.

Muon energy spectrum, [DATA(Nov99-Apr01) and MC(standard)], [DATA, MC(standard), MC(muon only)].normalized by their entries.

Muon angular distribution, [DATA(Nov99-Apr01) and MC(standard)], [DATA, MC(standard), MC(muon only)], normalized by their entries.

Stability of [energy] and [angle], monthly variation compared with the average of 250kA.

Comparison between 2000(blue: 99Nov-00June) vs 2001(red: 01Jan-01Apr), regarding [energy] and [angle].

Detection (& selection) efficiency as a function of muon energy

This is estimated by standard MC.

[(1-3rd iron, nlayer>=2) for event rate,and muon distribution analysis]

[(1-9th iron, nlayer>=1) for stability plots.]

Last up-date: July 02, 2001.
Send comments to MRD group, ishii@neutrino.kek.jp and maruyama@neutrino.kek.jp.

Fin.