Measurement of the top quark mass in thelepton+jetsfinal state with the matrix element method

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Abstract

We present a measurement of the top quark mass with the matrix element method in the $\mathrm{\text{lepton}}+\mathrm{\text{jets}}$ final state. As the energy scale for calorimeter jets represents the dominant source of systematic uncertainty, the matrix element likelihood is extended by an additional parameter, which is defined as a global multiplicative factor applied to the standard energy scale. The top quark mass is obtained from a fit that yields the combined statistical and systematic jet energy scale uncertainty. Using a data set of $0.4\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ taken with the D0 experiment at Run II of the Fermilab Tevatron Collider, the mass of the top quark is measured using topological information to be: ${m}_{\mathrm{top}}^{\ensuremath{\ell}+\mathrm{jets}}(\mathrm{topo})={169.2}_{\ensuremath{-}7.4}^{+5.0}(\mathrm{stat}+JES{)}_{\ensuremath{-}1.4}^{+1.5}(\mathrm{syst})\text{ }\text{ }\mathrm{GeV}$, and when information about identified $b$ jets is included: ${m}_{\mathrm{top}}^{\ensuremath{\ell}+\mathrm{jets}}(b\mathrm{\text{-tag}})={170.3}_{\ensuremath{-}4.5}^{+4.1}(\mathrm{stat}+\phantom{\rule{0ex}{0ex}}JES{)}_{\ensuremath{-}1.8}^{+1.2}(\mathrm{syst})\text{ }\text{ }\mathrm{GeV}$. The measurements yield a jet energy scale consistent with the reference scale.

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