Search Of Anomalous Wtb Couplins In Single Top Quark Prodution At PDF Download
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Total Pages | : 3 |
Release | : 2011 |
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Download Search of Anomalous $Wtb$ Couplins in Single Top Quark Prodution at Book in PDF, ePub and Kindle
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, including possible anomalous couplings. D0 has made measurements of single top quark production using 5.4 fb−1 of integrated luminosity. We examine the data to study the Lorentz structure of the Wtb coupling. We find that the data prefer the left-handed vector coupling and set upper limits on the anomalous couplings. In 2009, the electroweak single top quark production was observed by the D0 and CDF collaborations. Electroweak production of top quarks at the Tevatron proceeds mainly via the decay of a time-like virtual W boson accompanied by a bottom quark in the s-channel (tb = t{bar b} + {bar t}b), or via the exchange of a space-like virtual W boson between a light quark and a bottom quark in the t-channel (tqb = tq{bar b} + {bar t}qb, where q refers to the light quark). For a top quark mass of 172.5 GeV, The Standard Model (SM) prediction of single top production rate at next-to-leading order with soft-gluon contributions at next-to-next-to-leading order are 1.04 ± 0.04 pb (s-channel) and 2.26 ± 0.12 pb (t-channel). The large mass of the top quark implies that it has large couplings to the electroweak symmetry breaking sector of the SM and may have non-standard interactions with the weak gauge bosons. Single top quark production provides a unique probe to study the interactions of the top quark with the W boson.
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Release | : 2011 |
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Download Search for Anomalous $Wtb$ Couplings in Single Top Quark Production in $p\bar{p}$ Collisions at $\sqrt{s} Book in PDF, ePub and Kindle
We present new direct constraints on a general Wtb interaction using data corresponding to an integrated luminosity of 5.4 fb−1 collected by the D0 detector at the Tevatron p{bar p} collider. The standard model provides a purely left-handed vector coupling at the Wtb vertex, while the most general, lowest dimension Lagrangian allows right-handed vector and left- or right-handed tensor couplings as well. We obtain precise limits on these anomalous couplings by comparing the data to the expectations from different assumptions on the Wtb coupling.
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Total Pages | : 6 |
Release | : 2012 |
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Download Search for Anomalous Wtb Couplings in Single Top Quark Production in Pp Collisions at {u221A}s Book in PDF, ePub and Kindle
We present new direct constraints on a general Wtb interaction using data corresponding to an integrated luminosity of 5.4 fb-1 collected by the D0 detector at the Tevatron pp collider. The standard model provides a purely left-handed vector coupling at the Wtb vertex, while the most general, lowest dimension Lagrangian allows right-handed vector and left- or right-handed tensor couplings as well. We obtain precise limits on these anomalous couplings by comparing the data to the expectations from different assumptions on the Wtb coupling.
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Release | : 2016 |
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Download Search for Anomalous Wtb Couplings and Flavour-changing Neutral Currents in T-channel Single Top Quark Production in Pp Collisions at Sqrt(s) Book in PDF, ePub and Kindle
Single top quark events produced in the t channel are used to set limits on anomalous Wtb couplings and to search for top quark flavour-changing neutral current (FCNC) interactions. The data taken with the CMS detector at the LHC in proton-proton collisions at sqrt(s) = 7 and 8 TeV correspond to integrated luminosities of 5.0 and 19.7 inverse-femtobarns, respectively. The analysis is performed using events with one muon and two or three jets. A Bayesian neural network technique, used to discriminate between the signal and backgrounds, is found to be consistent with the standard model prediction. The 95% confidence level (CL) exclusion limits on anomalous right-handed vector, and left- and right-handed tensor Wtb couplings are measured to be
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Release | : 2016 |
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Download Search for Anomalous Wtb Couplings and Flavour-changing Neutral Currents in T-channel Single Top Quark Production in Pp Collisions at √s Book in PDF, ePub and Kindle
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Total Pages | : 46 |
Release | : 2016 |
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Download Search for Anomalous Couplings in the W Tb Vertex from the Measurement of Double Differential Angular Decay Rates of Single Top Quarks Produced in the T-channel with the ATLAS Detector Book in PDF, ePub and Kindle
Author | : Jason Tsz Shing Yue |
Publisher | : Springer |
Total Pages | : 143 |
Release | : 2017-08-29 |
Genre | : Science |
ISBN | : 331963402X |
Download Higgs Properties at the LHC Book in PDF, ePub and Kindle
This thesis studies the properties of the Higgs particle, discovered at the Large Hadron Collider (LHC) in 2012, in order to elucidate its role in electroweak symmetry breaking and cosmological phase transition in the early universe. It shows that a generic spin-2 Higgs impostor is excluded by the precision measurements of electroweak observables and perturbative unitarity considerations. It obtains LHC constraints on anomalous CP-violating Higgs-Top Yukawa couplings and examines the prospects of their measurement in future experiments. Lastly, it discusses in detail the electroweak phase transition and generation of cosmological matter–antimatter asymmetry in the universe with anomalous Higgs couplings.
Author | : Sarah Kristina Wolinski |
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Total Pages | : 524 |
Release | : 2002 |
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Download Search for Single-top-quark Production in Pp̄ Collisions at [square Root of Strange Quark] Book in PDF, ePub and Kindle
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Total Pages | : 8 |
Release | : 2008 |
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Download Single Top Quark Production at Book in PDF, ePub and Kindle
We present first evidence for the production of single top quarks at the Fermilab Tevatron p{bar p} collider. Using a 0.9 fb−1 dataset, we apply a multivariate analysis to separate signal from background and measure cross section for single top quark production. We use the cross section measurement to directly determine the CKM matrix element that describes the Wtb coupling. We also present results of W0 and charged Higgs searches with the same final states as standard model single top quark production.
Author | : Wang Wei |
Publisher | : World Scientific |
Total Pages | : 576 |
Release | : 2020-02-27 |
Genre | : Science |
ISBN | : 9811207410 |
Download Lepton Photon Interactions At High Energies (Lepton Photon 2017) - Proceedings Of The 28th International Symposium Book in PDF, ePub and Kindle
The latest of the 'Lepton Photon' symposium, one of the well-established series of meetings in the high-energy physics community, was successfully organized at the South Campus of Sun Yat-sen University, Guangzhou, China, from August 7-12, 2017, where physicists around the world gathered to discuss the latest advancements in the research field.This proceedings volume of the Lepton Photon 2017 collects contributions by the plenary session speakers and the posters' presenters, which cover the latest results in particle physics, nuclear physics, astrophysics, cosmology, and plans for future facilities.