Bulletin of the American Physical Society
2006 APS April Meeting
Saturday–Tuesday, April 22–25, 2006; Dallas, TX
Session L13: Top Quark Mass Measurements |
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Sponsoring Units: DPF Chair: Eva Halkiadakis, Rutgers University Room: Hyatt Regency Dallas Cumberland G |
Sunday, April 23, 2006 3:15PM - 3:27PM |
L13.00001: Top Quark Mass Measurement in Lepton+Jets Channel Using the Transverse Decay Length of b-Hadrons from Top Decays Chris Hill We have developed a novel method to measure the mass of the top quark using the transverse decay length of b-hadrons from top decays. This technique relies solely on tracking and thus avoids the jet energy scale uncertainty that is common to all other methods. We have applied this new method to a lepton+jets top sample corresponding to 0.7 fb$^{-1}$ and have extracted a measurement of the top quark mass. While this result is not a competitive measurement by itself, since the decay length technique is uncorrelated with other methods, it will help to reduce the overall uncertainty on the top's mass in combination with other Tevatron measurements. [Preview Abstract] |
Sunday, April 23, 2006 3:27PM - 3:39PM |
L13.00002: Measurement of the top quark mass at D0 using lepton+jets events Carlos Garcia We report on the measurement of the top quark mass using ttbar candidates in the lepton+jets final states. For each event a probability 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 hadronic jets forming a W- boson. This reduces the large uncertainty due to the jet energy scale. [Preview Abstract] |
Sunday, April 23, 2006 3:39PM - 3:51PM |
L13.00003: Top Quark Mass in Dilepton Channel Bo Jayatilaka We present a measurement of the top quark mass in events in the dilepton channel produced in $p\overline{p}$ collisions at $\sqrt{s}=1.96$~TeV using 700~pb$^{-1}$ of data collected at the CDF II detector. We extract the top quark mass from a probability that a given event is consistent with $t\bar{t}$ decaying to a final state including two leptons. The probability is evaluated using a differential cross-section for $t\overline{t}$ 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. A previous measurement using this method yielded the most precise single measurement of the top quark mass in the dilepton channel to date. [Preview Abstract] |
Sunday, April 23, 2006 3:51PM - 4:03PM |
L13.00004: Measurement of the Top Quark Mass at D\O\ using Dilepton Events Joerg Meyer We report on a measurement of the top quark mass using $t\bar{t}$ candidates in the dilepton final states. The kinematics of these events are solved for a range of assumed top quark masses, and the relative likelihood of each solution is assessed. Information from the complete set of events is combined in a maximum likelihood fit to extract the top quark mass and its uncertainty. [Preview Abstract] |
Sunday, April 23, 2006 4:03PM - 4:15PM |
L13.00005: Top Quark Mass Measurement in the All-hadronic Channel Gheorghe Lungu We present here a preliminary measurement of the top quark mass in the all-jet final state, where both W's decay hadronically. The measurement is performed using $p\bar p$ collision data at $\sqrt{s}$ = 1.96 TeV at the Collider Detector at Fermilab. The method employed uses matrix element information to weigh each event configuration according to the probability for it to originate from ttbar production and decay at a given top mass. All the event probabilities are multiplied to yield a total likelihood which depends on the top mass. The estimated mass is the value at which the total likelihood is minimized. [Preview Abstract] |
Sunday, April 23, 2006 4:15PM - 4:27PM |
L13.00006: Top Quark Mass Measurement in Lepton+Jets Channel Using a Matrix Element Method Brian Mohr We present a measurement of the mass of the top quark from $p\bar p$ to $t\bar t$ events in the lepton plus jets channel. We use events from 681 pb$^{-1}$ of data from collisions at 1.96 TeV observed with the Collider Detector at Fermilab (CDF). The largest systematic uncertainty is convoluted with the statistical error using an in-situ measurement of the hadronic W boson mass. A likelihood is calculated for each event using a leading-order $t\bar t$ and W+jets cross-section, and parameterized parton showering. The final measured top quark mass and JES systematic is extracted from a joint likelihood of the product of the individual event likelihoods. [Preview Abstract] |
Sunday, April 23, 2006 4:27PM - 4:39PM |
L13.00007: Top Quark Mass Measurment in Lepton+Jets Channel Using a Template Method Wojtek Fedorko We present a measurement of the top quark mass employing the template method with data collected by the CDF Run II detector. We select lepton+jet events to isolate top-antitop pair production in a 690 pb$^-1$ sample of proton- antiproton collisions at $\sqrt{s} =1.96$ TeV. In each event we use kinematic constraints on the pair of top quarks and their decay products to determine a reconstructed top quark mass. We simultaneously determine the invariant mass of the decaying W boson to calibrate the energy response of the detector. The reconstructed top quark mass and W boson invariant mass distributions are fit to Monte Carlo derived templates in a simultaneous likelihood fit to extract the top quark mass and an in-situ measurement of the jet energy scale. [Preview Abstract] |
Sunday, April 23, 2006 4:39PM - 4:51PM |
L13.00008: Top Quark Mass Measurement in Lepton+Jets Channel Using a Multivariate Technique John Freeman We present a preliminary measurement of the top quark mass using the Run II data collected with the CDF detector at Fermilab. The $t\bar{t}$ events produced in $p\bar{p}$ collisions at $\sqrt{s}$ = 1.96 GeV are reconstructed in the lepton+jets channel. Using a matrix element method with transfer functions derived from Monte Carlo to connect jets to partons, we calculate a likelihood for each event to be a top candidate at several possible top masses. Taking into account the presence of background and using additional kinematics variables we derive a value for the top mass. [Preview Abstract] |
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