We present the first measurement of the mass of the top quark in a sample of t (t) over bar -> l (nu)over bar b (b) over bar q (q) over bar events (where l = e, mu) selected by identifying jets containing a muon candidate from the semileptonic decay of heavy-flavor hadrons (soft muon b tagging). The p (p) over bar collision data used correspond to an integrated luminosity of 2 fb(-1) and were collected by the CDF II detector at the Fermilab Tevatron Collider. The measurement is based on a novel technique exploiting the invariant mass of a subset of the decay particles, specifically the lepton from the W boson of the t -> Wb decay and the muon from a semileptonic b decay. We fit template histograms, derived from simulation of t (t) over bar events and a modeling of the background, to the mass distribution observed in the data and measure a top quark mass of (180.5 +/- 12.0(stat) +/- 3.6(syst)) GeV/c(2), consistent with the current world average value.

Measurement of the top quark mass using the invariant mass of lepton pairs in soft muon b-tagged events

CIOCCI, MARIA AGNESE;DONATI, SIMONE;
2009-01-01

Abstract

We present the first measurement of the mass of the top quark in a sample of t (t) over bar -> l (nu)over bar b (b) over bar q (q) over bar events (where l = e, mu) selected by identifying jets containing a muon candidate from the semileptonic decay of heavy-flavor hadrons (soft muon b tagging). The p (p) over bar collision data used correspond to an integrated luminosity of 2 fb(-1) and were collected by the CDF II detector at the Fermilab Tevatron Collider. The measurement is based on a novel technique exploiting the invariant mass of a subset of the decay particles, specifically the lepton from the W boson of the t -> Wb decay and the muon from a semileptonic b decay. We fit template histograms, derived from simulation of t (t) over bar events and a modeling of the background, to the mass distribution observed in the data and measure a top quark mass of (180.5 +/- 12.0(stat) +/- 3.6(syst)) GeV/c(2), consistent with the current world average value.
2009
T., Aaltonen; J., Adelman; T., Akimoto; B. A., Gonzalez; S., Amerio; D., Amidei; A., Anastassov; A., Annovi; J., Antos; G., Apollinari; A., Apresyan; ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/828810
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