K2K June/2001 Official Plots

Scintillating Fiber Detector Group

Last Update: Sat Jul 28 14:59:57 JST 2001

Analysis Summaries:

Nsk-expected
Expected number of events at Super-K.
eventrate_scifi.ps
Reduction rate at SciFi as func of month normalized by P.O.T.
Systematic Error Summary
Systematic terms for both the FGD analysis and expected number of events at Super-K.

Detector Performance:

Hit Finding Efficiency / Npix as func of time (2000-2001) for Typical IIT(#14)
Averaged HFE, overlayed with data
Primary track finding efficiency as func. of track length, using cosmic ray data and neytrino beam MC.
The z-vertex difference between (x, z) and (y, z) vertex for two track events. Data and MC events are compared.

Basic Distributions:

P_mu.ps (Neut MUC-3D+1L). In these plots the hatched region is QE.
- Page 1: Muon Energy distribution P_mu (GeV/c)(GIF)
- Page 2: Angle of muon wrt to beam theta_mu (deg)(GIF)
- Page 3: E_nu (GeV) (GIF)
- Page 4: q^2 (GeV)^2(GIF)
proton.tlen.ps 2ndary track range distribution

Neutrino Spectrum Measurement:

Event_summary.ps	Event Summary
data_mcNeut.ps	E_nu reconstructed for 1-track and 2-track samples before background subtractions.
d-theta.ps	We use the number of events in d-theta>40deg to obtain the mormalization factor (c) of Monte Carlo to data. This region is dominated by inelastic events.
cdtheta.ps	By using the factor (c) and the shape of the inelastic background, we estimate the inelastic background in the signal (Qausi-elastic) region (d-theta<30deg.) at each E_nu bin.
data_mcNeut_inel_comp	Top figure shows the E_nu for d-thata>50 deg. This again shows that the overall normalization (c) is valid at each energy bin for background subtraction. Middle and bottom figures show p_mu and theta_mu of the background distribution. Measured background distributions are well reproduced by Monte Carlo background distribution.
spec.2trk.neut.ps spec.2tr.fine.neut.ps (spec.2trk.nuance.ps) (spec.2tr.fine.nuance.ps)	E_nu unfolded. *This time, we use only 2-track sample to reconstruct the neutrino spetcrum.* We assume a flat neutrino spectrum to reconstruct the spectrum. Namely, we do not assume any input Monte Carlo flux. These plots are flux*(QE cross-section). The plot with fine binning with Stat. Error only. MC (E_true) is overlayed with entry number normalization. Nuance plots for comparison.
scifi.spec.systematic.ps	Systematic errors are summarized. N.B. Since we clearly separate inelastic events from quasi-elastic events in d-theta distribution, the systematic error of the spectrum due to nQE/QE uncertainty (+-30%) is negligible (3% level).

Upgrade Plan:

Efficiency vs E_nu for 1-track and 2-track selection
- select.1trk.ps
- select.2trk.ps
1) Present setup / 2) Without LG and PID1 (Downstream)
3) Without LG and PID2 (Downstream/Top/1Side)

Send comments and questions on these plots to sakuda@neutrino.kek.jp

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