Bulletin of the American Physical Society
2005 APS April Meeting
Saturday–Tuesday, April 16–19, 2005; Tampa, FL
Session B8: Top Quark Physics I |
Hide Abstracts |
Sponsoring Units: DPF Chair: Sarah Eno, University of Maryland Room: Marriott Tampa Waterside Room 4 |
Saturday, April 16, 2005 10:45AM - 10:57AM |
B8.00001: Di-lepton Top mass measurement in CDF using kinematic method Tuula Maki We present a top mass measurement using ~340\,pb$^{-1}$ of Run II data collected by the CDF experiment at Fermilab. The measurement uses $t\bar{t}$ event candidates having two high transverse momentum leptons and at least two jets together with large missing $E_T$. We measure the top quark mass by reconstructing a top mass in each event and comparing the resulting distribution to Monte Carlo templates. [Preview Abstract] |
Saturday, April 16, 2005 10:57AM - 11:09AM |
B8.00002: All-hadronic Top Mass measurement in CDF using matrix element method Gheorghe Lungu We present here a preliminary measurement of the top quark mass in the all-hadronic channel, where both W's decay hadronically. The measurement is performed using 340 pb$^{-1}$ of ppbar collisions at $\sqrt(s)$ = 1.96 TeV with the Collider Detector at Fermilab. The method used employs the 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 true top mass is estimated by the value at which the total likelihood is minimized. [Preview Abstract] |
Saturday, April 16, 2005 11:09AM - 11:21AM |
B8.00003: Di-lepton Top Quark Mass Measurement with the Neutrino Weighting Algorithm Simon Sabik We report a measurement of the Top Quark Mass using approximately 340 $pb^{-1}$ of data from $p\bar{p}$ collisions at $\sqrt{s}$ = 1.96 GeV at CDF Run II. We select $t\bar{t}$ candidates that are consistent with two $W$ bosons decaying leptonically. Only one of the two charged leptons is required to be identified as an electron or a muon candidate, while the other is simply a well measured track. Using the Neutrino Weighting Algorithm to reconstruct a top quark mass in each event and comparing the resulting distribution to Monte Carlo templates, we measure the top quark mass. [Preview Abstract] |
Saturday, April 16, 2005 11:21AM - 11:33AM |
B8.00004: Top quark mass measurement in the lepton plus jets channel at CDF with a matrix element method Adam Gibson We present a preliminary measurement of the top quark mass, using events from $p\bar{p}$\ collisions at $\sqrt{s}$= 1.96 TeV observed with the Collider Detector at Fermilab (CDF). The events are required to contain one energetic electron or muon, large missing transverse energy, and four jets. Likelihoods are calculated as a function of top quark mass for each event, using leading-order $t\bar{t}$\ and background matrix elements, and parameterized parton showering. The final measured top quark mass is extracted from a joint likelihood that is the product of the individual event likelihoods. [Preview Abstract] |
Saturday, April 16, 2005 11:33AM - 11:45AM |
B8.00005: Measurement of the top quark mass in the lepton+jets channel at CDF using the template method Jahred Adelman We report an updated measurement of the top quark mass with the CDF Run II detector at Fermilab. The measurement uses the lepton+jets channel to identify top quark pairs produced in proton-antiproton collisions at $\sqrt{s} = 1.96$\~TeV. We reconstruct a top quark mass in each event by using kinematic constraints on the pair of top quarks and their decay products for double b-tag, one b-tag, and no b-tag samples. The top quark mass is extracted by comparing the reconstructed mass distributions to Monte Carlo templates using a likelihood fit. [Preview Abstract] |
Saturday, April 16, 2005 11:45AM - 11:57AM |
B8.00006: Top mass measurement in the lepton plus jets channel at CDF with a multivariate method 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 TeV are reconstructed in the lepton+jets channel. Using a matrix element integration and 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 kinematic variables, we estimate a value for the top mass. [Preview Abstract] |
Saturday, April 16, 2005 11:57AM - 12:09PM |
B8.00007: Measurement of the top quark mass in the dilepton channel at CDF using a matrix element method Andrew Kovalev We present a preliminary measurement of the top quark mass in events containing two energetic leptons, two jets and missing tranverse energy produced in $p\bar{p}$\ collisions at $\sqrt{s} $ = 1.96 TeV, with 340~pb$^{-1}$\ collected by the CDF detector. The top quark mass is extracted from the posterior ensemble probability distribution, which is formed by evaluating for each event the differential cross section for top quark pair production and decay as a function of the top quark mass. The differential cross sections for the background processes are treated similarly and are included in the probability evaluation. [Preview Abstract] |
Saturday, April 16, 2005 12:09PM - 12:21PM |
B8.00008: Measurement of the Top Quark Mass with an {\em in situ}\ W$\to q\bar{q}\prime$ Calibration at CDF Jean-Francois Arguin We present a preliminary measurement of the top quark mass using data from $p\bar{p}$\ collisions at $\sqrt{s} = 1.96$\ TeV collected by the CDF detector. We select $t\bar{t}$\ events where one W boson decays leptonically and the other hadronically. The observed invariant mass of the hadronic W boson decay is used to reduce the largest systematic uncertainty arising from the jet energy scale. The top quark mass and hadronic W boson mass distributions reconstructed in data are compared to Monte Carlo expectations to determine simultaneously the top quark mass and the jet energy scale. [Preview Abstract] |
Saturday, April 16, 2005 12:21PM - 12:33PM |
B8.00009: A method for measurement of the top quark mass using the mean decay length of b hadrons in t-tbar events. J.M. Lamb, C.S. Hill, J.R. Incandela We present a new method for the experimental determination of the top quark mass that is based upon the mean distance of travel of b hadrons in top quark events. The dominant systematic uncertainties of this method are uncorrelated with those of other methods, but a large number of events is required to achieve a small statistical uncertainty. Such large event samples are expected from Run II of the Fermilab Tevatron and the CERN Large Hadron Collider (LHC). By the end of Run II, a single experiment at the Tevatron could achieve a top quark mass uncertainty of $\sim $5 GeV/c$^{2}$ by this method alone. At the CERN LHC, our studies indicate that this method will likely be comparable to all other methods combined, which are expected to achieve an uncertainty of 1.5-2 GeV/c$^{2}$. This method could be used to cross-check other methods, or combined with them to obtain a substantially reduced overall uncertainty. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700