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Showing 1 to 20 of 51 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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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 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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Measurement of the top quark mass from top quarks produced in proton-proton collisions at √s = 13 TeV that decay to dimuons via a J/ψ
The top quark mass is measured using tt → lepton + J/ψ(→ µ +µ −) events, using proton-proton collision data collected by the ATLAS detector at a centre-of-mass energy of √ s = 13 TeV, during 2015-2018. The data corresponds to a total integrated luminosity of 139.0 fb−1 . This lepton + J/ψ channel …
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Measurement of the top anti-top quark pair production cross section in the dilepton decay channel using Lepton+Track selection in 7 TeV p − p collisions with L = 698 PB−1
We present measurements of the t¯t production cross section obtained using the ATLAS detector at the LHC with pp collisions at √s = 7 TeV in dilepton final states, from a data sample of L=698 pb−1 taken in 2011. For dilepton pair selection we have used a ‘Lepton+Track’ approach, where selection …
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Measurement of top-antitop differential cross sections in the di-lepton channel with ATLAS in p-p collisions at 7TeV
… of mass, transverse momentum and rapidity of the top quark pairs using $\sqrt{s} = 7 \TeV$ proton-proton collision data collected by the ATLAS detector at the Large Hadron Collider. This data corresponds to an integrated luminosity of \lumitot. Events with top quark pair signatures are selected in …
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