Bulletin of the American Physical Society
2007 APS April Meeting
Volume 52, Number 3
Saturday–Tuesday, April 14–17, 2007; Jacksonville, Florida
Session T14: Top Mass |
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Sponsoring Units: DPF Chair: Robin Erbacher, University of California, Davis Room: Hyatt Regency Jacksonville Riverfront City Terrace 10 |
Monday, April 16, 2007 1:30PM - 1:42PM |
T14.00001: Measurement of the top quark mass at D0 using the matrix-element method in the lepton+jets channel Carlos Garcia We report on the measurement of the top quark mass using $t\bar {t}$ candidates in the lepton+jets final state. For each event, a probability based on the differential cross section for $t\bar{t}$ production is calculated as a function of the top mass and the overall jet energy scale. The top mass and jet energy scale are extracted by maximizing a likelihood constructed as the product of the single event probabilities. The overall jet energy scale is constraint by the two jets from the hadronic W boson decay. [Preview Abstract] |
Monday, April 16, 2007 1:42PM - 1:54PM |
T14.00002: Top Mass Measurement with a Matrix Element Technique using the Dilepton Channel at CDF Bodhitha Jayatilaka We present a measurement of the top quark mass in events in the dilepton channel using 1.2 fb$^{-1}$ of data collected at the CDF II detector. We extract the top quark mass from a probability that a given event is consistent with $t\bar{t}$ decay in the dilepton channel. The probability is evaluated using a differential cross-section for ttbar production and decay. The effect of background events in the sample is accounted for in the probability calculation by evaluating differential cross sections for major background processes. [Preview Abstract] |
Monday, April 16, 2007 1:54PM - 2:06PM |
T14.00003: ABSTRACT WITHDRAWN |
Monday, April 16, 2007 2:06PM - 2:18PM |
T14.00004: Measurement of Top Quark Mass by Dynamical Likelihood Method in the Lepton+Jets Channel at CDF Taichi Kubo We present a measurement of the top quark mass with the dynamical likelihood method (DLM) using the CDF II detector at Fermilab Tevatron. The data we use in this analysis corresponds to an integrated luminosity of 1.2 fb$^{-1}$. We use events in the lepton+jets channel with at least one jet tagged as a bottom quark. The likelihood as a function of top quark mass is defined as the differential cross section per unit phase space volume of the final partons, multiplied by the transfer function from jets to parton quantities. The method takes into account all possible parton-jet identifications in an event and the likelihood is multiplied event by event to derive the top quark mass. The jet energy scale (JES) uncertainty is estimated as a statistical uncertainty by calibrating it with the W mass mesurement. [Preview Abstract] |
Monday, April 16, 2007 2:18PM - 2:30PM |
T14.00005: Measurement of the Top Quark Mass in All-Hadronic Decays using the Ideogram Method at CDF II Petteri Mehtala We present a measurement of the top quark mass in the all-hadronic decay channel. The analysis is performed using 310 pb$^{-1}$ of $p\bar{p}$ collisions collected with the CDF II detector using a multi-jet trigger. The mass measurement is based on an event-by-event likelihood which depends on both the sample purity and the value of the top quark mass, using 90 possible jet-to-parton assignments in the six-jet final state. The joint likelihood of 290 selected events yields a value for the top mass of $177.1 \pm 4.9(stat.) \pm 4.7(syst.)$ GeV/c$^2$. [Preview Abstract] |
Monday, April 16, 2007 2:30PM - 2:42PM |
T14.00006: Top Quark Mass Measurement in the All-Hadronic Channel using a Combined Matrix Element and Template Method at CDF Gheorghe Lungu We present a preliminary measurement of the top quark mass in the all-hadronic channel, using 1 fb$^{-1}$ of $p\bar{p}$ collisions at $\sqrt{s} = 1.96$ TeV collected at the Collider Detector at Fermilab. Assuming standard model $t\bar{t}$ production and using the matrix element as a weight, an event probability is calculated. The top quark mass is reconstructed for each event by maximizing the event probability, and so Monte Carlo templates are produced, dependent of the true top quark mass and the jet energy scale. The most likely top mass is extracted by fitting the data to the templates distributions. [Preview Abstract] |
Monday, April 16, 2007 2:42PM - 2:54PM |
T14.00007: Top Quark Mass Measurement in the Dilepton Channel using the $t\bar{t}$ $P_z$ at CDF Tuula Maki We present a top mass measurement using data collected by the CDF experiment at Fermilab. The measurement uses $t\bar{t}$ event candidates having two high transverse momentum leptons, at least two jets and missing transverse energy from escaping neutrinos. Reconstruction of the top quark mass from dilepton events involves an underconstrained system. In this analysis, it is resolved by introducing an additional equation for the longitudinal momentum of the $t\bar{t}$ system. The top quark mass is reconstructed for each event, and the final result is achieved by comparing the resulting distribution from data to Monte Carlo templates. [Preview Abstract] |
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