2012
DOI: 10.1140/epjc/s10052-012-2202-z
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Measurement of the top-quark mass in $\mathrm{t}\overline{\mathrm{t}}$ events with dilepton final states in pp collisions at $\sqrt{s}=7\ \mbox{TeV}$

Abstract: The top-quark mass is measured in proton-proton collisions at √ s = 7 TeV using a data sample corresponding to an integrated luminosity of 5.0 fb −1 collected by the CMS experiment at the LHC. The measurement is performed in the dilepton decay channel tt → ( + ν b) ( − ν b), where = e, µ. Candidate top-quark decays are selected by requiring two leptons, at least two jets, and imbalance in transverse momentum. The mass is reconstructed with an analytical matrix weighting technique using distributions derived fr… Show more

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Cited by 45 publications
(18 citation statements)
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References 33 publications
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“…The uncertainty on the top-quark mass is 0.9 GeV from the combined measurement [56] at the Tevatron. However, this result would be biased in the presence of a signal in the lepton+jets channel, so a larger uncertainty of 1.5 GeV is taken, which is consistent with the latest top-quark mass measurement in the dilepton channel from the CMS experiment [67]. Changing the top-quark mass leads to altered event kinematics, which results in a final uncertainty on the event rate of 1.9 %.…”
Section: Systematic Uncertaintiessupporting
confidence: 61%
“…The uncertainty on the top-quark mass is 0.9 GeV from the combined measurement [56] at the Tevatron. However, this result would be biased in the presence of a signal in the lepton+jets channel, so a larger uncertainty of 1.5 GeV is taken, which is consistent with the latest top-quark mass measurement in the dilepton channel from the CMS experiment [67]. Changing the top-quark mass leads to altered event kinematics, which results in a final uncertainty on the event rate of 1.9 %.…”
Section: Systematic Uncertaintiessupporting
confidence: 61%
“…of template fitting is similar to ideas used by many other experiments such as ALICE [45], ATLAS [46], CDF [47] and CMS [48], where it is also known as the cocktail fit method. The use of independent templates without interference terms is a good approximation, because the mass differences between resonances decaying to π + + π − are either large as compared to their width or they decay to π + + π − with small branching ratio only (e.g.…”
Section: Event and Track Selectionmentioning
confidence: 99%
“…If none of the eight solutions is physical, we vary the measured jet momenta within their resolutions using the procedure described in Ref. [72]. We sample 1000 times per event and choose the set of parameters with at least one physical solution for tt candidates and the smallest χ 2 with respect to the measured jets.…”
Section: Resonance Reconstructionmentioning
confidence: 99%