### Session X11: Top II

1:30 PM–3:18 PM, Tuesday, April 15, 2008
Hyatt Regency St. Louis Riverfront (formerly Adam's Mark Hotel), Room: St. Louis B

Chair: Amnon Harel, University of Rochester

Abstract ID: BAPS.2008.APR.X11.2

### Abstract: X11.00002 : An upper limit on the total width of the top quark at CDF

1:42 PM–1:54 PM

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#### Author:

Satomi Shiraishi

We present the first direct experimental upper limit on the total decay width of the top quark using 955 pb$^{-1}$ of the Tevatron's $p\bar p$ collisions taken by the CDF II detector at the Fermilab Tevatron. We identify 253 top-antitop pair candidate events. The distribution of reconstructed top quark mass from the candidate events is fitted to template representing different values of the top quark width. The Feldman-Cousins prescription is used to extract an upper limit on the top quark width at 95$\%$ confidence level for an assumed top quark mass of 175 GeV/c$^2$.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2008.APR.X11.2