Entdeckung Elektroschwacher Produktion Einzelner Top Quarks Mit Dem Cdf Ii Experiment Discovery Electroweak Production Of Single Top Quarks With The Cdf Ii Experiment PDF Download
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Total Pages | : 180 |
Release | : 2009 |
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Download Entdeckung Elektroschwacher Produktion Einzelner Top-Quarks Mit Dem CDF II Experiment; Discovery Electroweak Production of Single Top Quarks with the CDF II Experiment Book in PDF, ePub and Kindle
This thesis presents a neural network search for combined as well as separate s- and t-channel single top-quark production with the CDF II experiment at the Tevatron using 3.2 fb-1 of collision data. It is the twelfth thesis dealing with single top-quark production performed within the CDF Collaboration, whereas three have been done in Run I [53-55] and eight in Run II [23, 25, 28, 39, 56-59].
Author | : Jan Lück |
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Release | : 2009 |
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Download Observation of Electroweak Single Top-Quark Production with the CDF II Experiment Book in PDF, ePub and Kindle
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Total Pages | : 204 |
Release | : 2007 |
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Download Search for Electroweak Single Top-quark Production with the CDF II Experiment Book in PDF, ePub and Kindle
Understanding the world -- This aim drives humankind since the beginning of conscious thinking. Especially the nature of matter has been of major interest. Nowadays, we have a complex image of the constitution of matter. Atoms consist of electrons and nucleons. But even nucleons are not elementary. Their basic constituents are called quarks. Physicists developed a model describing the elementary components of matter as well as the forces between them: the standard model of elementary particle physics. The substructure of matter is only visible in scattering experiments. In high energy physics, these experiments are done at particle accelerators. The world's highest energetic collider, the Tevatron, is hosted by the Fermi National Accelerator Laboratory (FNAL), also called Fermilab, in the vicinity of Chicago. The proton-antiproton collisions with a center-of-mass energy of (square root)s = 1.96 TeV are recorded by two multipurpose detectors, namely D0 and CDF II.
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Total Pages | : 180 |
Release | : 2009 |
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Download Observation of Electroweak Single Top-Quark Production with the CDF II Experiment Book in PDF, ePub and Kindle
The standard model of elementary particle physics (SM) predicts, besides the top-quark pair production via the strong interaction, also the electroweak production of single top-quarks [19]. Up to now, the Fermilab Tevatron proton-antiproton-collider is the only place to produce and study top quarks emerging from hadron-hadron-collisions. Top quarks were directly observed in 1995 during the Tevatron Run I at a center-of-mass energy of √s = 1.8 TeV simultaneously by the CDF and D0 Collaborations via the strong production of top-quark pairs. Run II of the Tevatron data taking period started 2001 at √s = 1.96 TeV after a five year upgrade of the Tevatron accelerator complex and of both experiments. One main component of its physics program is the determination of the properties of the top quark including its electroweak production. Even though Run II is still ongoing, the study of the top quark is already a successful endeavor, confirmed by dozens of publications from both Tevatron experiments. A comprehensive review of top-quark physics can be found in reference. The reasons for searching for single top-quark production are compelling. As the electroweak top-quark production proceeds via a Wtb vertex, it provides the unique opportunity of the direct measurement of the CKM matrix element.
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Release | : 2005 |
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Download CDF Electroweak Studies and the Search for the Top Quark Book in PDF, ePub and Kindle
The second major run of the [bar p]p Fermilab Tevatron Collider ended on May 30. The CDF detector has accumulated almost five times the data sample of its previous 1988-1989 run. The author presents new results on electroweak physics, including the ratio of W to Z boson production cross-sections, and the charge asymmetry in W decay. He gives a progress report on the measurement of the W mass. New results from the 1988-1989 data on W-[gamma] production are also presented. The status of the search for the top quark in the dilepton modes is described. In addition a status report of the ongoing search in the lepton + jets mode is given.
Author | : Mathieu Agelou |
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Total Pages | : 171 |
Release | : 2005 |
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Download Search for the Electroweak Production of the Top Quark in the D0 Experiment Book in PDF, ePub and Kindle
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Release | : 2006 |
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Download Search for Electroweak Single Top Quark Production with Cdf in Proton - Anti-proton Collisions at S**(1/2) Book in PDF, ePub and Kindle
Abstract Not Provided.
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Total Pages | : 6 |
Release | : 2010 |
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Download Observation of Single Top-quark Production with the CDF II Experiment Book in PDF, ePub and Kindle
We present the observation of electroweak single top-quark production using up to 3.2 fb−1 of data collected by the CDF experiment. Lepton plus jets candidate events are classified by four parallel analysis techniques: one likelihood discriminant, one matrix-element discriminant, one decision-tree discriminant, and one neural-network discriminant. These outputs are combined with a super discriminant based on a neural-network analysis in order to improve the expected sensitivity. In conjunction with one neural-network discriminant using a complementary dataset of MET plus jets events with a veto on identified leptons we observe a signal consistent with the standard model but inconsistent with the background-only model by 5.0 standard deviations, with a median expected sensitivity in excess of 5.9 standard deviations.
Author | : Yves Kemp |
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Total Pages | : 116 |
Release | : 2006 |
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Download Identification of Electrons in the Forward Region of the CDF Experiment for the Search for Electroweak Top Quark Production Book in PDF, ePub and Kindle
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Release | : 2003 |
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Download Top Quark and Electroweak Results from CDF. Book in PDF, ePub and Kindle
In 2001 the Tevatron run II began, after a five year period of significant upgrade of the accelerator itself and of the experiments CDF and D0. After a detector commissioning run, the CDF experiment is now taking high quality data with all subsystems functional. We report in this talk the first preliminary CDF results on top quark and W/Z boson properties, based on run II data. The top quark, discovered in 1995 at the Tevatron, has proven to be a very interesting particle. Its properties allow to perform stringent tests of the Standard Model (SM) and to search for new physics through a deviation from SM predictions. We give here some expectations of what Tevatron run II will ultimately provide to our understanding of matter.