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

Aaltonen, T.; Adelman, J.; Akimoto, T.; Alvarez Gonzalez, B.; Amerio, S.; Amidei, D.; Anastassov, A.; Annovi, A.; Antos, J.; Apollinari, G.

doi:10.1103/PhysRevD.80.051104

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

CDF

Collaboration

Jun, 2009

9 pages

Published in:

Phys.Rev.D 80 (2009) 051104

e-Print:

0906.5371 [hep-ex]

DOI:

10.1103/PhysRevD.80.051104

PDG:

{{\mathit t}}

-Quark Mass (Direct Measurements)

Report number:

FERMILAB-PUB-09-332-E

Experiments:

FNAL-E-0830

View in:

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Abstract: (arXiv)

We present the first measurement of the mass of the top quark in a sample of

t\bar{t}\to\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

^{-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\to 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\pm12.0({\rm stat.})\pm3.6({\rm syst.}) {\rm GeV}/c^2

, consistent with the current world average.

Note:

submitted to Phys. Rev. D (R)

12.15.Ff
14.65.Ha
OSG : CDF
anti-p p: interaction
top: pair production
top: mass
final state: ((n)jet lepton)
transverse energy: missing-energy
Batavia TEVATRON Coll
bottom particle: semileptonic decay

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