Measuring the top quark mass with the mT2 variable

We investigate the possibility of measuring the top quark mass using the collider variable m_T2 at the CERN LHC experiment. Monte Carlo studies of m_T2 are performed with the events corresponding to the dilepton decays of t tmacr produced at the LHC with 10fb^-1 integrated luminosity. Our analysis suggests that the top quark mass can be determined by the m_T2 variable with a reasonable accuracy, though the precision will be determined by systematic errors for which a more complete analysis would need to be performed.