Measurement of the Top Quark Mass Using the Invariant Mass of Lepton Pairs in Soft Muon b-tagged Events

Journal Article · Mon Jun 01 04:00:00 EDT 2009

OSTI ID:961949

Aaltonen, T; Adelman, Jahred A; Akimoto, T; Alvarez Gonzalez, B; Amerio, S; Amidei, Dante E; Anastassov, A; Annovi, Alberto; Antos, Jaroslav; Apollinari, G; Apresyan, A

We present the first measurement of the mass of the top quark in a sample of t{bar t} {yields} {ell}{bar {nu}}b{bar b}q{bar q} events (where {ell} = e, {mu}) selected by identifying jets containing a muon candidate from the semileptonic decay of heavy-flavor hadrons (soft muon b-tagging). The p{bar p} collision data used corresponds to an integrated luminosity of 2 fb{sup -1} and was collected by the CDF II detector at the Fermilab Tevatron. 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 {yields} Wb decay, and the muon from a semileptonic b decay. We fit template histograms, derived from simulation of t{bar t} 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{sup 2}, consistent with the current world average.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 961949
• Report Number(s): FERMILAB-PUB-09-332-E; arXiv eprint number arXiv:0906.5371
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
DECAY
Experiment-HEP
FERMILAB COLLIDER DETECTOR
FERMILAB TEVATRON
HADRONS
INTERMEDIATE BOSONS
LEPTONS
LUMINOSITY
MASS DISTRIBUTION
MUONS
SEMILEPTONIC DECAY
T QUARKS