Measurements of the b-tag performance from data in CMS

摘要

In order not to rely on the b-tagging performances predicted fromsimulation studies, several data-driven methods are proposed to estimate the per-formance of these b-tagging algorithms. A divers range of methods exploiting theproperties of jets resulting from heavy flavoured quarks has been presented to esti-mate the performance of b-tagging algorithms from collision data detected in CMS.They can be applied already in a start-up scenario with uncertainties around 15% for10 pb~(-1)of data. With about 1000 pb~(-data these uncertainties can be reducedto about 5% depending on our understanding of the detector performance and thephysics in proton collisions at 14 TeV.