Measurement of the top quark mass using the template method in the lepton plus jets channel with in situ W ---> j j calibration at CDF-II

Adelman, Jahred A. ; Arguin, J.F. ; Bellettini, G. ; Brubaker, E. ; Budagov, J. ; Chlachidze, G. ; Demortier, L. ; Gibson, A. ; Kim, S. ; Kim, Y.K. ; Maruyama, T. ; Sato, K. ; Shochet, M. ; Sinervo, P. ; Tomura, T. ; Velev, G. ; Xie, S. ; Yang, U.K. ; /Chicago U. /Toronto U. /INFN, Pisa /Dubna, JINR /Rockefeller U. /LBL, Berkeley /Tsukuba U. /Fermilab

Fermi National Accelerator Laboratory

关键词: Calibration;    Daughter Products;    Luminosity;    T Quarks Experiment-Hep;    Intermediate Bosons;   

DOI  :  10.2172/899066
RP-ID  :  FERMILAB-FN-0794-E
RP-ID  :  AC02-07CH11359
RP-ID  :  899066

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来源: UNT Digital Library

【 摘 要 】

We report an updated measurement of the top quark mass in the lepton plus jets channel of t{bar t} events from p{bar p} collisions at {radical}s = 1.96 TeV. This measurement uses a dataset with integrated luminosity of 680 pb{sup -1}, containing 360 t{bar t} candidates separated into four subsamples. A top quark mass is reconstructed for each event by using energy and momentum constraints on the top quark pair decay products. We also employ the reconstructed mass of hadronic W boson decays W {yields} jj to constrain in situ the largest systematic uncertainty of the top quark mass measurement: the jet energy scale. Monte Carlo templates of the reconstructed top quark and W boson mass are produced as a function of the true top quark mass and the jet energy scale. The distribution of reconstructed top quark and W boson mass in the data are compared to the Monte Carlo templates using a likelihood fit to obtain: M{sub top} = 173.4 {+-} 2.8 GeV/c{sup 2}.