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Showing 1 to 20 of 59 for “"Top Quark"”.
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Perturbative calculations and the top quark
Submitted by Elizabeth Kent (eckent2@illinois.edu) on 2012-05-17T17:34:22Z No. of bitstreams: 1 1998_Smith.pdf: 1562557 bytes, checksum: 155cebb27389d86711a7d7d56bea2899 (MD5)
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Search for supersymmetric partners of the top quark with the CMS detector and novel top quark tagging algorithms.
… looked for evidence that the superpartner of the top quark was produced then decayed into an undetected particle and a top quark that decayed to hadronic jets. No statistically significant deviation from standard model expectations is observed. Limits are placed on the production cross section in …
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Effective field theory for top quark physics
The top quark plays an important role in the search for physics beyond the standard model because of its large mass. In the situation where new physics exist at an energy scale higher than the scale we can probe directly, it is desirable to have a model-independent approach, which we can use to …
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Testing the Standard Model With Top Quark Production
… we analyze the possibilities for studying single-top-quark production at the Tevatron and LHC. We find that there may be evidence for single-top-quark production in Run I data. Run II at the Tevatron should allow the W-gluon fusion cross section to be measured to $\pm$22% with 2 fb$\sp{-1}$ of …
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Testing the Standard Model with Top-Quark Production
Now that the existence of the top quark is firmly established, attention turns to measuring its properties. Because of its large mass, the top quark may be sensitive to physics beyond the standard model. A promising candidate for this new physics is supersymmetry. Hence, we calculate the …
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Measurement of W Boson Polarization in Top Quark Decay
… of the polarization of the W boson from top quark decay is an excellent test of the V-A form of the charged-current weak interaction in the standard model. Since the longitudinal W boson is intimately related to the electroweak symmetry breaking mechanism, and the standard model gives a …
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Search for the top quark at [radical]s=1.8 TeV
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1994.
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A search for the lightest supersymmetric partner of the top quark at DO
… of the light supersymmetric partner of the top quark (t˜1) in 5.4+/-0.3 fb-1 of data from the DO detector at a pp¯ center-of-mass energy of 1.96 TeV at the Fermilab Tevatron collider. The scalar top quarks are assumed to decay into a b quark, a charged lepton and a scalar neutrino …
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Signals of supersymmetry in top quark decays at positron-electron and hadron-hadron colliders
… influence of supersymmetry on the search for the top quark (as yet, undiscovered) by studying the two specific processes: $e\sp+ e\sp-$ $\to$ $\Theta$ $\to$ $g\tilde{g}\tilde{k}$, where $\tilde{k}$ is either a $\tilde{g}$ or $\tilde{\gamma}$, and $pp \to$ $t\bar{t}X$ followed by $t$ $\to$ …
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Top quark mass measurement in the electron+jets decay channel using the Matrix Element Method
… in order to isolate collisions giving rise to a top anti-top quark pair. These quarks decay into an electron and four jets. For a recorded luminosity 19.8 fb-1, 8898 events were analyzed after a very tight selection. The analysis was performed with the Matrix Element Method, one of the most …
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Top quark mass measurement in the Lepton+Jets channel using full simulation of the CMS detector
… of 14 TeV the production cross section for top/antitop quarks (ttbar) is about 830 pb (NLO). The top quarks almost exclusively decay into a W boson and a b quark via the weak interaction. In about 44.4% of all events one of the top quarks decays into a lepton and neutrino while the other one …
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Search for flavor changing neutral currents in top quark decays using a two-leptons+track selection
A search for flavor-changing neutral currents in top quark decays is described. Data collected at a center- of-mass energy of √s = 7 TeV during 2011 corresponding to an integrated luminosity of 2.1 fb^{-1} are used. A cut-based analysis is used on top quark pair production events, where one top …
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Search for Single Top Quark Production With the CDF Run II Detector Using a Multivariate Likelihood Method
Made available in DSpace on 2015-09-25T20:03:07Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 3337708.pdf: 3969434 bytes, checksum: 18e6d533a50f7bdc9fdefb07e9c3096e (MD5) Previous issue date: 2008
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Sensitivity of the Top quark mass measurement with the CMS experiment at LHC using t-tbar multijet simulated events
… which is the actual goal of the experiment. The topic of physics work of this thesis is the study of tt events fully hadronic decay in the CMS experiment. A multi-jet trigger has been provided to fix a reasonable starting point, reducing the multi-jet sample to the nominal trigger rate. An …
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Measurement of the electroweak top quark production cross section and the CKM matrix element V (tb) with the DO experiment
… of the combined s+t-channel electroweak topquark production cross section at the Tevatron collider. An integrated luminosity of nearly 1 fb^{-1} of Run~II data has been analyzed. After the selection of single top quark-like events, a Multi-Process Factory hasbeen used to analyze each …
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Measurement of the Top Quark-Antitop Quark Differential Cross Section, dsigma/dM(tt), in Proton-Antiproton Collisions at Center of Mass Energy = 1.96 TEV
… for Kaluza Klein gravitons which decay to top quarks. I find kappa/MPl > 0.16 at the 95% confidence level.
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Measurement of inclusive and differential cross sections for single top quark production in association with a W boson in proton-proton collisions at √s = 13 TeV
… es el estudio de la producción conjunta de un quark top y un bosón W (proceso tW) usando los datos recogidos por el experimento CMS durante el Run-2 del LHC en colisiones protón-protón a una energía en el centro de masas de √s = 13 TeV y correspondientes a una luminosidad total integrada de 138 …
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