We present the first direct experimental bound on the total decay width of the top quark using 955 pb-1 of the Tevatron's p anti-p collisions recorded by the Collider Detector at Fermilab. We identify 253 top-antitop pair candidate events. The distribution of reconstructed top quark mass from these events is fitted to templates representing different values of the top quark width. Using a confidence interval based on likelihood ratio ordering, we extract an upper limit at 95% C.L. of Gamma_t < 13.1 GeV for an assumed top quark mass of 175 GeV/c2.
A. Castro, M. Deninno, P. Mazzanti, N. Moggi, F. Rimondi, F. Semeria, et al. (2009). Direct Bound on the Total Decay Width of the Top Quark in p anti-p Collisions at s**(1/2) =1.96 TeV. PHYSICAL REVIEW LETTERS, 102, 042001-1-042001-7 [10.1103/PhysRevLett.102.042001].
Direct Bound on the Total Decay Width of the Top Quark in p anti-p Collisions at s**(1/2) =1.96 TeV
CASTRO, ANDREA;DENINNO, MARIA MADDALENA;MOGGI, NICCOLO';RIMONDI, FRANCO;ZUCCHELLI, STEFANO
2009
Abstract
We present the first direct experimental bound on the total decay width of the top quark using 955 pb-1 of the Tevatron's p anti-p collisions recorded by the Collider Detector at Fermilab. We identify 253 top-antitop pair candidate events. The distribution of reconstructed top quark mass from these events is fitted to templates representing different values of the top quark width. Using a confidence interval based on likelihood ratio ordering, we extract an upper limit at 95% C.L. of Gamma_t < 13.1 GeV for an assumed top quark mass of 175 GeV/c2.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
