CMS-PAS-TOP-14-014

CMS-PAS-TOP-14-014
Determination of the top-quark mass from the m(lb) distribution in dileptonic ttbar events at sqrt(s) = 8 TeV
CMS Collaboration
2014

Abstract: A measurement of the top-quark mass is presented using the distribution of the invariant mass $m_{lb}$ of the lepton and the b-quark originating from top-quark decays. The analysed dataset of pp-collisions at a centre-of-mass energy $\sqrt{s}=8$ TeV was recorded by the CMS experiment at the LHC, and corresponds to an integrated luminosity of 19.7 fb $^{-1}$ . Top-quark pair candidate events are selected with two opposite-charge isolated leptons, one electron and one muon, and at least two jets in the final state.Using the $m_{lb}$ shape prediction from MadGraph a top-quark mass of .3\pm1.3 $GeV is obtained, consistent with previous measurements and with the world average. In addition, a study is presented in which the shape and/or normalisation of the measured$ m_{lb}$ distribution are used to extract the top-quark mass using different theory predictions, the MadGraph simulation as well as a fixed-order QCD calculation.
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