Search Of Anomalous Wtb Couplins In Single Top Quark Prodution At
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Search Of Anomalous Wtb Couplins In Single Top Quark Prodution At
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Author :
language : en
Publisher:
Release Date : 2011
Search Of Anomalous Wtb Couplins In Single Top Quark Prodution At written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
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.
Search For Anomalous Wtb Couplings In Single Top Quark Production In P Bar P Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2011
Search For Anomalous Wtb Couplings In Single Top Quark Production In P Bar P Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
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.
Search For Anomalous Wtb Couplings In Single Top Quark Production In Pp Collisions At U221a S
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Author :
language : en
Publisher:
Release Date : 2012
Search For Anomalous Wtb Couplings In Single Top Quark Production In Pp Collisions At U221a S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
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.
Higgs Properties At The Lhc
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Author : Jason Tsz Shing Yue
language : en
Publisher: Springer
Release Date : 2017-08-29
Higgs Properties At The Lhc written by Jason Tsz Shing Yue and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-08-29 with Science categories.
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.
Search For Anomalous Wtb Couplings And Flavour Changing Neutral Currents In T Channel Single Top Quark Production In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2016
Search For Anomalous Wtb Couplings And Flavour Changing Neutral Currents In T Channel Single Top Quark Production In Pp Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
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
Supersymmetry And The Unification Of Fundamental Interactions
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Author : Deog Ki Hong
language : en
Publisher: American Institute of Physics
Release Date : 2008-12-11
Supersymmetry And The Unification Of Fundamental Interactions written by Deog Ki Hong and has been published by American Institute of Physics this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-12-11 with Science categories.
This annual SUSY conference has become the world's largest international meeting devolted to new ideas in high energy physics. The main subject of the conference is theoretical and phenomenological aspects of supersymmetric theories, and dark matter and dark energy, and other comological connections. New, interesting results from various experimental groups are increasingly presented at the conference as well. With roughly 200 plenary and parallel presentations, SUSY08 will likely deliver energy and enthusiasm of both theorists and experimentalists who are searching the frontier of high energy physics.
Linear Collider Physics In The New Millennium
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Author : Keisuke Fujii
language : en
Publisher: World Scientific
Release Date : 2005
Linear Collider Physics In The New Millennium written by Keisuke Fujii and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Science categories.
The high energy electron-positron linear collider is expected to provide crucial clues to many of the fundamental questions of our time: What is the nature of electroweak symmetry breaking? Does a Standard Model Higgs boson exist, or does nature take the route of supersymmetry, technicolor or extra dimensions, or none of the foregoing? This invaluable book is a collection of articles written by experts on many of the most important topics which the linear collider will focus on. It is aimed primarily at graduate students but will undoubtedly be useful also to any active researcher on the physics of the next generation linear collider.
Proceedings Of The Workshop On Standard Model Physics And More At The Lhc
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Author : CERN
language : en
Publisher:
Release Date : 2000
Proceedings Of The Workshop On Standard Model Physics And More At The Lhc written by CERN and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with B mesons categories.
Search For Single Top Quark Production In Pp Collisions At Square Root Of Strange Quark
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Author : Sarah Kristina Wolinski
language : en
Publisher:
Release Date : 2002
Search For Single Top Quark Production In Pp Collisions At Square Root Of Strange Quark written by Sarah Kristina Wolinski and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.
Search For Anomalous Wtb Couplings And Flavour Changing Neutral Currents In T Channel Single Top Quark Production In Pp Collisions At S
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Author :
language : en
Publisher:
Release Date : 2016
Search For Anomalous Wtb Couplings And Flavour Changing Neutral Currents In T Channel Single Top Quark Production In Pp Collisions At S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.