Global Time Fit for Track Finding on MDT Muon Chambers for the ATLAS Muon Spectrometer

Monitored drift tubes chambers (MDT) are the precision tracking detectors in the muon spectrometer of the ATLAS experiment. During normal operation the muon trigger is based on dedicated trigger chambers (RPC) also responsible for measuring the coordinate along the MDT tubes (second coordinate). A new method has been developed for tracking particles through the MDT chambers which can work without any external trigger information or using only a part of it. This study was conceived to exploit tracking capabilities under non standard operation of the detector: commissioning during ATLAS installation; MDT used as standalone detectors. Another interesting possibility is the measurement of the second coordinate, describe the results obtained with cosmic rays data at the MDT test stand facility in Roma Tre and with the H8 Test Beam experimental setup at the CERN SPS accelerator.