Measurement of the top quark mass at CDF using the "neutrino phi weighting" template method on a lepton plus isolated track sample
We present a measurement of the top quark mass with tt̅ dilepton events produced in pp̅ collisions at the Fermilab Tevatron (√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 o...
| Main Authors: | , , , , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
American Physical Society
2010
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| Online Access: | http://hdl.handle.net/1721.1/50640 https://orcid.org/0000-0002-6047-4211 |
| Summary: | We present a measurement of the top quark mass with tt̅ dilepton events produced in pp̅ collisions at the Fermilab Tevatron (√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[superscript -1], are selected as tt̅ candidates. To account for the unconstrained event kinematics, we scan over the phase space of the azimuthal angles (ϕ[subscript ν1],ϕ[subscript ν2]) of neutrinos and reconstruct the top quark mass for each ϕ[subscript ν1], ϕ[subscript ν2] pair by minimizing a χ[superscript 2] function in the tt̅ dilepton hypothesis. We assign χ[superscript 2]-dependent weights to the solutions in order to build a preferred mass for each event. Preferred mass distributions (templates) are built from simulated tt̅ and background events, and parametrized 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[subscript -3.3][superscript +3.4](stat)±3.1(syst) GeV/c[superscript 2]. |
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