Validation of the Mean-Timer algorithm for DT Local Reconstruction and muon time measurement, using 2012 data.

The Mean-Timer algorithm is used for the local reconstruction within the CMS Drift Tubes (DT), for muons that appear to be out-of-time (OOT) or lack measured hits in one of the two space projections. Compared to standard linear fit, this method improves the spatial resoluton for OOT muons. It also allows a precise time measurement that can be used to tag OOT muons, in order either to reject them (e.g. as a result of OOT Pile Up) or to select them for exotic physical analyses. The algorithm was initially developed and tuned on simulation. We present here the first performance results obtained on 2012 data.