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Absolute Calibration of Luminosity Measurement at CMS: Summer 2011 Update
Luminosity calibration results based on Van der Meer scans conducted in May and June of 2011 are presented. A systematic scale uncertainty of 4.5\% is estimated. For 2011 running prior to August 2011, where the instantaneous per-bunch luminosity was typically 1~Hz/$\mu$b, a scale non-linearity of 7....
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Publicado: |
2011
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Acceso en línea: | http://cds.cern.ch/record/1376102 |
Sumario: | Luminosity calibration results based on Van der Meer scans conducted in
May and June of 2011 are presented. A systematic scale uncertainty of
4.5\% is estimated. For 2011 running prior to August 2011, where the
instantaneous per-bunch luminosity was typically 1~Hz/$\mu$b, a scale
non-linearity of 7.6\% was observed. An afterglow correction resulting
from leakage from collisions in earlier bunches ranges up to $2.5\%$, depending on the filling pattern for the LHC. Luminosity
results used as input to CMS analyses are corrected for both scale
non-linearity and afterglow in a run-dependent way. Taking all
corrections into account results in an upward correction of 5\% with
respect to the values reported online for the typical 2011 run. |
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