Background Information

This is a measurement of the total Z cross section times the branching ratio into muons using 337 pb-1 of data taken between Aug 2002 and Aug 2004.

Some parts of the analysis were taken from the 72 pb-1 analysis and not recalculated with the new dataset. These are things we assumed did not change significantly.

Systematic uncertainties associated with the PDFs
Systematic uncertainties associated with momentum scaling and smearing
Systematic uncertainties associated with the production model used in the simulation which was used to generate the pseudorapidity and PT distributions of the Z bosons
Background estimates for Z decay to tau's, diboson production, and top production

See PRL 94, 091803 and hep-ex/0508029 for details of the 72 pb-1 analysis. Everything else was recalculated using the 337 pb-1 dataset and new simulation.

For more information contact David Dagenhart

Results

Mass Distribution of Z Candidates:

Narrow range:

Wide range:

Table showing cross section times branching ratio, acceptance, luminosity, and background: