CMS Z (mumu) yields for comparisons with ATLAS

For the purpose of checking and monitoring the luminosity delivered to experiments CMS and ATLAS agree(d) on common criteria and datasets to check the yields of standard model EWK processes (Z(mumu) for now). This documents contains the information about the final deliverable, efficiency corrected Z yield, which is proportional to the "true" cross-section and the integrated luminosity in the sample(s).