Determination of the top-quark mass from the m(lb) distribution in dileptonic ttbar events at sqrt(s) = 8 TeV - INSPIRE

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Determination of the top-quark mass from the m(lb) distribution in dileptonic ttbar events at sqrt(s) = 8 TeV

CMS

Collaboration

2014

19 pages

Report number:

CMS-PAS-TOP-14-014

Experiments:

CERN-LHC-CMS

View in:

CERN Document Server

reference search26 citations

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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

172.3\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.

Note:

Preliminary results

Data
top: mass: measured
top: pair production
top: semileptonic decay
dilepton: final state
mass spectrum: measured
shape analysis
electron
muon
bottom

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