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Measurement of the top quark mass in final states with two leptons
Baringer, Philip S. Bean, Alice Clutter, Justace Randall McGivern, Carrie Lynne Moulik, Tania Wilson, Graham Wallace Abazov, V. M. Abbott, B. Abolins, M. Acharya, B. S.
Baringer, Philip S.
Bean, Alice
Clutter, Justace Randall
McGivern, Carrie Lynne
Moulik, Tania
Wilson, Graham Wallace
Abazov, V. M.
Abbott, B.
Abolins, M.
Acharya, B. S.
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Abstract
We present measurements of the top quark mass (mt) in tt-bar candidate events with two final state leptons using 1ââfb(â1) of data collected by the D0 experiment. Our data sample is selected by requiring two fully identified leptons or by relaxing one lepton requirement to an isolated track if at least one jet is tagged as a b jet. The top quark mass is extracted after reconstructing the event kinematics under the tt-bar hypothesis using two methods. In the first method, we integrate over expected neutrino rapidity distributions, and in the second we calculate a weight for the possible top quark masses based on the observed particle momenta and the known parton distribution functions. We analyze 83 candidate events in the data and obtain mt=176.2±4.8(stat)±2.1(sys)ââGeV and mt=173.2±4.9(stat)±2.0(sys)ââGeV for the two methods, respectively. Accounting for correlations between the two methods, we combine the measurements to obtain mt=174.7±4.4(stat)±2.0(sys)ââGeV.
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This is the publisher's version, also available electronically from http://journals.aps.org/prd/abstract/10.1103/PhysRevD.80.092006.
Date
2009-11-20
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American Physical Society
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V. M. Abazov et al. (The D0 Collaboration). (2009). "Measurement of the top quark mass in final states with two leptons." Physical Review D, 80(9):092006. http://dx.doi.org/10.1103/PhysRevD.80.092006.