Bulletin of the American Physical Society
2007 APS April Meeting
Volume 52, Number 3
Saturday–Tuesday, April 14–17, 2007; Jacksonville, Florida
Session X13: Single Top |
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Sponsoring Units: DPF Chair: Kirsten Tollefson, Michigan State University Room: Hyatt Regency Jacksonville Riverfront City Terrace 9 |
Tuesday, April 17, 2007 10:45AM - 10:57AM |
X13.00001: Search for Electroweak Single Top Quark Production at CDF using a Matrix Element Method Peter Dong We present new results from searches for single-top-quark production using 1 fb$^{-1}$ of data accumulated with the CDF detector. We select events with one charged lepton, large missing transverse energy, and two jets, where one jet is identified as a b-quark jet using displaced secondary-vertex information from the CDF silicon detector. We employ a matrix-element analysis technique to improve separation of signal and background and greatly improve the sensitivity of our search. [Preview Abstract] |
Tuesday, April 17, 2007 10:57AM - 11:09AM |
X13.00002: Search for non-standard production of single top quarks at D0 Reinhard Schwienhorst The large mass of the top quark, close to the electroweak symmetry-breaking scale, makes it a good candidate for probing physics beyond the Standard Model. Single top quarks may be produced in the decay of a new heavy gauge boson W' and we present limits on the production cross section and the mass of such a W' assuming standard model like couplings. We also search for single top productions through flavor changing neutral currents involving gluon, Z boson, or photon exchange. [Preview Abstract] |
Tuesday, April 17, 2007 11:09AM - 11:21AM |
X13.00003: Measurement of single top quark production at D0 using Bayesian neural networks Monica Pangilinan, Shabnam Jabeen, Meenakshi Narain We present evidence for single top quark production in proton- antiproton collisions using a dataset of almost 1 fb$^{-1}$ collected with the D0 detector. Single top quarks are expected to be produced in association with bottom quarks through the exchange of a W boson in the s- channel and the t-channel. We select events with one energetic electron or muon, missing transverse energy, and two, three or four jets, with at least one b-tagged jet. This analysis uses Bayesian neural networks to separate the signal from the background. We measure a cross section compatible with the Standard Model prediction for electroweak production of single top. [Preview Abstract] |
Tuesday, April 17, 2007 11:21AM - 11:33AM |
X13.00004: Combined single top quark production cross section and measurement of $|V_{tb}|$ at D0 Jorge Benitez We combine the different analyses carried out by the D0 Collaboration to extract evidence for single top quark production and present the first direct measurement of the CKM matrix element $|V_{tb}|$. [Preview Abstract] |
Tuesday, April 17, 2007 11:33AM - 11:45AM |
X13.00005: Measurement of single top quark production at D0 using a matrix element discriminant Chris Potter We present evidence for single top quark production in proton- antiproton collisions using a dataset of almost 1 fb$^{-1}$ collected with the D0 detector. Single top quarks are expected to be produced in association with bottom quarks through the exchange of a W boson in the s- channel and the t-channel. We select events with one energetic electron or muon, missing transverse energy, and two, three or four jets, with at least one b-tagged jet. This analysis uses a matrix element discriminant to separate the signal from the background. We measure a cross section compatible with the Standard Model prediction for electroweak production of single top. [Preview Abstract] |
Tuesday, April 17, 2007 11:45AM - 11:57AM |
X13.00006: Measurement of single top quark production at D0 using decision trees John BackusMayes We present evidence for single top quark production in proton- antiproton collisions using a dataset of almost 1 fb$^{-1}$ collected with the D0 detector. Single top quarks are expected to be produced in association with bottom quarks through the exchange of a W boson in the s- channel and the t-channel. We select events with one energetic electron or muon, missing transverse energy, and two, three or four jets, with at least one b-tagged jet. This analysis uses boosted decision trees to separate the signal from the background. We measure a cross section compatible with the Standard Model prediction for electroweak production of single top. [Preview Abstract] |
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