Proposal of a new tracking-based technique for the measurement of the top-quark mass.

We propose a new tracking-only method to measure the top quark mass. The analysis makes use of the $t \rightarrow Wb \rightarrow l\nu b$ decay chain and we use the invariant mass of the lepton and reconstructed secondary vertex - from the B-hadron decay. The method is tested by fitting pseudo-experiments generated from simulation using probability distributions for signal and background. The stability and expected uncertainties are evaluated. First results indicate that the errors are expected to be small but future development of the method is essential before applying it on data samples.