MDC post-mortem redux. D. A. Petyt 11 th May 2005. Status as of last CC meeting:
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D. A. Petyt 11th May 2005
Robert’s slide on BMPT weighting from Argonne
log10 pt
weight
log10 pz
Weights are stored in 2D histograms of p_z vs p_t for each parent particle type. These weights are extracted by the BMPTHistoWeightCalculator method in MCReweight
Note: LOGZ scale
BMPT weight vs neutrino parent - 2
PIONS KAONS PROTON/PBAR
pi+
K-
pi-
all
all
p
all
K0
K+
pbar
QEL
RES
DIS
BMPT weight Cross-section weight BMPT * x-sec weight
Visible Energy True Energy
3% change at the peak of the LE spectrum
This plot: ratio of MDC data to MC with tweaked x-sec parameters and nominal BMPT weights (i.e. 1.0). The chisq fit is to the straight line at 1.0.
This plot: ratio of MDC data to MC with both tweaked x-sec and BMPT parameters. The chisq fit is also to the straight line at 1.0. The fit is acceptable, although slightly worse than before
We clearly do not have enough MDC data to observe the effect of beam reweighting at this level
a_pi 6%
alpha_pi 5%
= ?
68,90% C.L.
Neutrino parent – Far
BMPT weight vs neutrino parent - far
PIONS KAONS PROTON/PBAR
pi+
K-
pi-
all
all
p
all
K+
K0
BMPT weight Cross-section weight BMPT * x-sec weight
FAR
NEAR
FAR
NEAR
Nominal, 68,90% C.L.
Nominal, no osc.
Weighted, 68,90% C.L.
Nominal, best fit
x
Nominal, best fit
Weighted, no osc.
x
Weighted, best fit
Weighted, best fit
NC contamination
MDC ‘data’
o
True parameters