## Measurement of the top quark mass with the dynamical likelihood method using lepton plus jets events with b-tags in $p\bar{p}$ collisions at $\sqrt{s} =$ 1.96-TeV

This report describes a measurement of the top quark mass, M_top, with the dynamical likelihood method (DLM) using the CDF II detector at the Fermilab Tevatron. The Tevatron produces top/anti-top (t anti-t) pairs in p anti-p collisions at a center-of-mass energy of 1.96 TeV. The data sample used in this analysis was accumulated from March 2002 through August 2004, which corresponds to an integrated luminosity of 318 pb-1. We use the tt-bar candidates in the ``epton+jets'' decay channel, requiring at least one jet identified as a b quark by finding a displaced secondary vertex. The DLM defines a likelihood for each event based on the differential cross section s a function of M_top per unit phase space volume of the final partons, multiplied by the transfer functions from jet to parton energies. The method takes into account all possible jet combinations in an event, and the likelihood is multiplied event by event to derive the top quark mass by the maximum likelihood method. Using 63 tt-bar candidates observed in the data, with 9.2 events expected from background, we measure the top quark mass to be 173.2+2.6_-2.4 (stat.) +/- 3.2 (syst.) GeV/c2, or 173+4.1_-4.0 GeV/c2.

### Duke Scholars

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## Related Subject Headings

- Nuclear & Particles Physics
- 5107 Particle and high energy physics
- 5101 Astronomical sciences
- 4902 Mathematical physics
- 0206 Quantum Physics
- 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
- 0201 Astronomical and Space Sciences

### Citation

*Phys. Rev.*,

*D73*, 092002.

*Phys. Rev.*D73 (2006): 092002.

*Phys. Rev.*, vol. D73, 2006, p. 092002.

## Published In

## Publication Date

## Volume

## Start / End Page

## Related Subject Headings

- Nuclear & Particles Physics
- 5107 Particle and high energy physics
- 5101 Astronomical sciences
- 4902 Mathematical physics
- 0206 Quantum Physics
- 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
- 0201 Astronomical and Space Sciences