Erratum to Zgamma Analysis

Previously I was using hist->Integral() to sum up histograms of mc, bg and data.

Ie, I was not including the overflow bins. I have now corrected this and am using

hist->GetSum();

Erratum to Zgamma Analysis

Helen Hayward,

University of Liverpool

Z0(e+e-)

Old New

MC 30.9±1.6 31.3±1.6

BG 2.8±0.9 2.8±0.9

MC+BG 33.7±1.8 34.1±1.8

Data 35 36

Xsec 4.7±0.8±0.3 4.8±0.8±0.3

Z0(+-)

Old New

MC 33.2±1.5 33.6±1.5

BG 2.1±0.7 2.1±0.6

MC+BG 35.3±1.6 35.7±1.7

Data 35 35

Xsec 4.5±0.8±0.2 4.4±0.8±0.2

Z0(l+l-)

Old New

MC 64.2±1.5 64.8±2.6

BG 4.9±1.5 4.9±1.5

MC+BG 69.1 69.8±3.0

Data 70 71

Xsec 4.6±0.5±0.2 4.6±0.5±0.2

distributions:

€

e+e−γ

Run:161830, Event: 69435

• m(e+,e-)=96.9 GeV/c2

• m(e+,e-, )=381.7 GeV/c2

Photon:

ET =141.4 GeV

Electron:

ET =28.9 GeV

Electron:

ET =143.2 GeV

Conclusion

After fixing the mistake: Final measured Xsec does not change. Gained one extra event in CC channel.