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Open Access item Top quark mass measurement in the lepton plus jets channel using a modified matrix element method

Authors:CDF Collaboration
Cabrera, Susana
Cuenca Almenar, Cristóbal
Álvarez González, B.
Casal, Bruno
Cuevas, Javier
Gómez, G.
Rodrigo, Teresa
Ruiz, Alberto
Scodellaro, Luca
Vila, Iván
Vilar, Rocío
Aaltonen, T.
Issue Date:10-Apr-2009
Publisher:American Physical Society
Citation:Physical Review - Section D - Particles and Fields 79 (7): 072001 (2009)
Abstract:We report a measurement of the top quark mass, m(t), obtained from p(p)over bar collisions at root s=1.96 TeV at the Fermilab Tevatron using the CDF II detector. We analyze a sample corresponding to an integrated luminosity of 1.9 fb(-1). We select events with an electron or muon, large missing transverse energy, and exactly four high-energy jets in the central region of the detector, at least one of which is tagged as coming from a b quark. We calculate a signal likelihood using a matrix element integration method, where the matrix element is modified by using effective propagators to take into account assumptions on event kinematics. Our event likelihood is a function of m(t) and a parameter JES (jet energy scale) that determines in situ the calibration of the jet energies. We use a neural network discriminant to distinguish signal from background events. We also apply a cut on the peak value of each event likelihood curve to reduce the contribution of background and badly reconstructed events. Using the 318 events that pass all selection criteria, we find m(t)=172.7 +/- 1.8(stat+JES)+/- 1.2(syst) GeV/c(2).
Publisher version (URL):http://dx.doi.org/ 10.1103/PhysRevD.79.072001
URI:http://hdl.handle.net/10261/22207
ISSN:1550-7998
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Appears in Collections:(IFIC) Artículos

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