Measurement of the top quark mass at CDF using the "neutrino $φ$ weighting" template method on a lepton plus isolated track sample

Details Measurement of the top quark mass at CDF using the "neutrino $φ$ weighting" template method on a lepton plus isolated track sample Measurement of the top quark mass at CDF using the "neutrino $φ$ weighting" template method on a lepton plus isolated track sample

2009-01-25

arxiv.org/abs/0901.3773v3

Phys.Rev.D79:072005,2009

Physics

High Energy Physics

High Energy Physics - Experiment

Submitted to Phys. Rev. D

Scientific paper

10.1103/PhysRevD.79.072005

We present a measurement of the top quark mass with t-tbar dilepton events produced in p-pbar collisions at the Fermilab Tevatron $\sqrt{s}$=1.96 TeV and collected by the CDF II detector. A sample of 328 events with a charged electron or muon and an isolated track, corresponding to an integrated luminosity of 2.9 fb$^{-1}$, are selected as t-tbar candidates. To account for the unconstrained event kinematics, we scan over the phase space of the azimuthal angles ($\phi_{\nu_1},\phi_{\nu_2}$) of neutrinos and reconstruct the top quark mass for each $\phi_{\nu_1},\phi_{\nu_2}$ pair by minimizing a $\chi^2$ function in the t-tbar dilepton hypothesis. We assign $\chi^2$-dependent weights to the solutions in order to build a preferred mass for each event. Preferred mass distributions (templates) are built from simulated t-tbar and background events, and parameterized in order to provide continuous probability density functions. A likelihood fit to the mass distribution in data as a weighted sum of signal and background probability density functions gives a top quark mass of $165.5^{+{3.4}}_{-{3.3}}$(stat.)$\pm 3.1$(syst.) GeV/$c^2$.

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