Rungekutta in numbers

all inv. masses < 140 >= 150
raw data 12524.5 11812.5 712.209

for comparison kickplane analysis: http://hades-wiki.gsi.de/cgi-bin/view/SimAna/ResultsForINPC#Number_of_pairs

ths number of pairs in pi0 is lower, however above 150, the number of pairs is higher.

systematic errors SIMULATION (PLUTO)

1. 14% - PLUTO parametrization (variation of blast/isotropic/...) -> $\sigma_{par}$
2. 16% - $\eta$ multiplicities - TAPS number -> $\sigma_{\eta}$
3. 11% - $\pi^{0}$ multiplicities - TAPS number -> $\sigma_{\pi^{0}}$

$\sigma_{sys}^{tot}$ = $\sqrt{\sigma_{par}^{2} + \sigma_{\eta}^{2} + \sigma_{\pi^{0}}^{2}}$ = 24%

systematic errors EXPERIMENT

For the systematical error calculation the following errors are taken into account:

1. 11% - normalization to the $\pi^{0}$ (charged pion analysis) -> $\sigma_{\pi^{0}}$
2. 10% - event mixing (background) -> $\sigma_{CB}$
3. 20% - self-consistency check of efficiency matrices/acceptances -> $\sigma_{Eff}$

$\sigma_{sys}^{tot}$ = $\sqrt{\sigma_{CB}^{2} + \sigma_{Eff}^{2}}$ = 22.36%

or if one take into acount also error coming from the $\pi^{0}$, then

$\sigma_{sys}^{tot}$ = $\sqrt{\sigma_{CB}^{2} + \sigma_{Eff}^{2} + \sigma_{\pi}^{2}}$ = 24.92%

Excess Function

$\sigma_{ratio} = |\frac{EXP}{SIM}| \cdot \sqrt{ (\frac{\sigma_{EXP}}{EXP})^{2} + (\frac{\sigma_{SIM}}{SIM})^{2} } $

 yield in experiment in eta region: 1.25071e-07
 yield in plutosim in eta region only from eta component 1.59329e-08
 excess number yield_exp/yield_plutosim 7.84987
 statistical error in eta region: 9.39296e-09
 statistical error of ratio : 0.589534
 systematical error in eta region 2.79659e-08
 systematical error of ratio: 1.75523
 statistical and systematical error in eta region 2.95011e-08
 statistical and systematical error of ratio: 2.3158e-07
so the enhancement can be written in the following way:
7.85 +- 0.59(stat) +- 1.76(sys EXP)

for comparison here are the numbers from the kickplane analysis:
http://hades-wiki.gsi.de/cgi-bin/view/SimAna/ResultsForINPC#Excess_Function

-- YvonnePachmayer - 15 Oct 2007
Topic revision: r1 - 15 Oct 2007, YvonnePachmayer
 
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