DATA/MC COMPARISON AT THE Z0 PEAK
Using old preselections (including electrons from 4 GeV)
MC normalisation at hadronic selection
Real data |
MC qq~ |
Normal. MC |
|
Total |
177350 |
66517 |
|
Hadronic |
49950 |
65406 |
|
Presel. |
6782 |
9170 |
6997 |
El. id. |
205 |
396 |
302 |
Fair agreement in preselection, bad disagreement in el. id.
Data-MC comparison ( plots )reasonable
Look at electron energy for 2tight and 1tight1loose selected pairs: the disagreement is all in the low energy region, below 10 GeV. New preselections: require 2 electrons above 10 GeV
Real data |
MC qq~ |
|
Presel. |
440 |
368.6 |
El. id. |
46 |
45.78 |
Unsatisfactory presel. agreement (but data-MC comparison plots not in bad shape). Conclusion: adopt new preselections and abandon the old 0.5 factor for 1tight-1loose pairs.