Top quark mass measurement in the tt̅ all hadronic channel using a matrix element technique in pp̅ collisions at √s=1.96  TeV

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http://hdl.handle.net/10138/24451

Citation

Aaltonen , T , Mehtala , P , Orava , R , Maki , T , Saarikko , H & CDF Collaboration 2009 , ' Top quark mass measurement in the tt̅ all hadronic channel using a matrix element technique in pp̅ collisions at √s=1.96  TeV ' , Physical Review D : Particles, Fields, Gravitation and Cosmology , vol. 79 , no. 7 , pp. 072010 . https://doi.org/10.1103/PhysRevD.79.072010

 Title: Top quark mass measurement in the tt̅ all hadronic channel using a matrix element technique in pp̅ collisions at √s=1.96  TeV Author: Aaltonen, T; Mehtala, P; Orava, R; Maki, T; Saarikko, H; CDF Collaboration Contributor: University of Helsinki, Department of PhysicsUniversity of Helsinki, Department of PhysicsUniversity of Helsinki, Department of PhysicsUniversity of Helsinki, Helsinki Institute of PhysicsUniversity of Helsinki, Department of Physics Date: 2009 Language: eng Number of pages: 28 Belongs to series: Physical Review D : Particles, Fields, Gravitation and Cosmology ISSN: 1550-7998 URI: http://hdl.handle.net/10138/24451 Abstract: We present a measurement of the top quark mass in the all-hadronic channel (\tt $\to$ \bb$q_{1}\bar{q_{2}}q_{3}\bar{q_{4}}$) using 943 pb$^{-1}$ of \ppbar collisions at $\sqrt {s} = 1.96$ TeV collected at the CDF II detector at Fermilab (CDF). We apply the standard model production and decay matrix-element (ME) to $\ttbar$ candidate events. We calculate per-event probability densities according to the ME calculation and construct template models of signal and background. The scale of the jet energy is calibrated using additional templates formed with the invariant mass of pairs of jets. These templates form an overall likelihood function that depends on the top quark mass and on the jet energy scale (JES). We estimate both by maximizing this function. Given 72 observed events, we measure a top quark mass of 171.1 $\pm$ 3.7 (stat.+JES) $\pm$ 2.1 (syst.) GeV/$c^{2}$. The combined uncertainty on the top quark mass is 4.3 GeV/$c^{2}$. Subject: 114 Physical sciences hep-ex Rights:
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