Search For Fcnh Top Quark Decay T Qh With H Gamma Gamma In Pp Collisions At At S
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Search For Fcnh Top Quark Decay T Qh With H Gamma Gamma In Pp Collisions At At S
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Author : 楊宜知
language : en
Publisher:
Release Date : 2019
Search For Fcnh Top Quark Decay T Qh With H Gamma Gamma In Pp Collisions At At S written by 楊宜知 and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
Seeing A Single Top Quark
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Author : Harish Potti
language : en
Publisher:
Release Date : 2020
Seeing A Single Top Quark written by Harish Potti and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
The top quark is the heaviest known elementary particle. With a coupling to the Higgs boson close to unity, the top quark plays a special role in electroweak symmetry breaking as well as in physics beyond the Standard Model. An accurate measurement of its properties can provide key information for understanding the physics at the TeV scale. In this dissertation, two measurements of the top quark properties are presented. The first part of this dissertation presents the first-ever ATLAS search for the associated production of a single top quark and a photon. This analysis is performed with 139 fb−1 of pp collision data collected by the ATLAS detector at the LHC at [square root symbol] s = 13 TeV. Only final states with exactly one lepton and at least one photon are considered in this analysis. In the second part, results from the combination of ATLAS searches for flavor changing neutral currents (FCNC) in t->Hq decays are presented. Four FCNC analyses, probing different Higgs decay modes, performed with 36.1 fb−1 of proton-proton collision data collected by the ATLAS detector in 2015-2016 are considered in the combination. They search for top-quark pair events in which one top quark decays into Wb and the other top quark decay into Hq
A Search For The Top Quark Decaying To Charged Higgs In P Bar P Collisions At S
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Author :
language : en
Publisher:
Release Date : 1993
A Search For The Top Quark Decaying To Charged Higgs In P Bar P 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 1993 with categories.
We present results of a search for the top quark decaying to a charged. Higgs boson (H) in p{bar p} collisions at √s = 1.8 TeV at the Fermilab Tevatron. Using 4.1 pb−1 of data collected during the 1988--1989 CDF run, we have searched for evidence of t{bar t} production assuming that t→ Hb and H→??{sub?}. We find no evidence for this decay and are able to exclude regions in the (m{sub t}, m{sub H}) plane for different Br(H→ {tau}?{sub {tau}}). We also interpret these results for the two Higgs doublet(THD) model.
Search For Excited Quarks In The Jet Final State In Proton U2013 Proton Collisions At U221a S
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Author :
language : en
Publisher:
Release Date : 2014
Search For Excited Quarks In The Jet Final State In Proton U2013 Proton 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 2014 with categories.
A search for excited quarks decaying into the ?+jet final state is presented. The analysis is based on data corresponding to an integrated luminosity of 19.7 fb-1 collected by the CMS experiment in proton–proton collisions at √s =8 TeV at the LHC. Events with photons and jets with high transverse momenta are selected and the ?+jet invariant mass distribution is studied to search for a resonance peak. The 95% confidence level upper limits on the product of cross section and branching fraction are evaluated as a function of the excited quark mass. Limits on excited quarks are presented as a function of their mass and coupling strength; masses below 3.5 TeV are excluded at 95% confidence level for unit couplings to their standard model partners.
A Search For The Top Quark Decaying To Charged Higgs In P Bar P Collisions At Radical
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Author :
language : en
Publisher:
Release Date : 2005
A Search For The Top Quark Decaying To Charged Higgs In P Bar P Collisions At Radical written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
We present results of a search for the top quark decaying to a charged. Higgs boson (H) in p[bar p] collisions at [radical]s = 1.8 TeV at the Fermilab Tevatron. Using 4.1 pb[sup [minus]1] of data collected during the 1988--1989 CDF run, we have searched for evidence of t[bar t] production assuming that t[r-arrow] Hb and H[r-arrow] [tau][nu][sub [tau]]. We find no evidence for this decay and are able to exclude regions in the (m[sub t], m[sub H]) plane for different Br(H[r-arrow] [tau][nu][sub [tau]]). We also interpret these results for the two Higgs doublet(THD) model.
Search For New Phenomena With Top Quark Pairs In Final States With One Lepton Jets And Missing Transverse Momentum In Pp Collisions At Square Root S
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Author : ATLAS Collaboration CERN
language : en
Publisher:
Release Date : 2021
Search For New Phenomena With Top Quark Pairs In Final States With One Lepton Jets And Missing Transverse Momentum In Pp Collisions At Square Root S written by ATLAS Collaboration CERN and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
Abstract: A search for new phenomena with top quark pairs in final states with one isolated electron or muon, multiple jets, and large missing transverse momentum is performed. Signal regions are designed to search for two-, three-, and four-body decays of the directly pair-produced supersymmetric partner of the top quark (stop). Additional signal regions are designed specifically to search for spin-0 mediators that are produced in association with a pair of top quarks and decay into a pair of dark-matter particles. The search is performed using the Large Hadron Collider proton-proton collision dataset at a centre-of-mass energy of s√ = 13 TeV recorded by the ATLAS detector from 2015 to 2018, corresponding to an integrated luminosity of 139 fb−1. No significant excess above the Standard Model background is observed, and limits at 95% confidence level are set in the stop-neutralino mass plane and as a function of the mediator mass or the dark-matter particle mass. Stops are excluded up to 1200 GeV (710 GeV) in the two-body (three-body) decay scenario. In the four-body scenario stops up to 640 GeV are excluded for a stop-neutralino mass difference of 60 GeV. Scalar and pseudoscalar dark-matter mediators are excluded up to 200 GeV when the coupling strengths of the mediator to Standard Model and dark-matter particles are both equal to one and when the mass of the dark-matter particle is 1 GeV
Search For Flavor Changing Neutral Current Top Quark Decays T Hq With H Bb In Pp Collisions At Square Root Of 2
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Author : Shota Tsiskaridze
language : en
Publisher:
Release Date : 2015
Search For Flavor Changing Neutral Current Top Quark Decays T Hq With H Bb In Pp Collisions At Square Root Of 2 written by Shota Tsiskaridze and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Search For A Vectorlike Quark With Charge 2 3 In T Z Events From Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2011
Search For A Vectorlike Quark With Charge 2 3 In T Z Events From 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 2011 with categories.
A search for pair-produced heavy vector-like charge-2/3 quarks, T, in pp collisions at a center-of-mass energy of 7 TeV, is performed with the CMS detector at the LHC. Events consistent with the flavor-changing-neutral-current decay of a T quark to a top quark and a Z boson are selected by requiring two leptons from the Z-boson decay, as well as an additional isolated charged lepton. In a data sample corresponding to an integrated luminosity of 1.14 inverse femtobarns, the number of observed events is found to be consistent with the standard model background prediction. Assuming a branching fraction of 100% for the decay T to tZ, a T quark with a mass less than 475 GeV/c2̂ is excluded at the 95% confidence level.
Search For Flavor Changing Neutral Currents In Top Quark Decays T To Zq In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2013
Search For Flavor Changing Neutral Currents In Top Quark Decays T To Zq 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 2013 with categories.
Search For A Heavy Bottom Like Quark In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2011
Search For A Heavy Bottom Like Quark 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 2011 with categories.
A search for pair-produced bottom-like quarks in pp collisions at sqrt(s) = 7 TeV is conducted with the CMS experiment at the LHC. The decay b' to tW is considered in this search. The b' b'-bar to tW-̂ t-bar W+̂ process can be identified by the distinctive signature of trileptons and same-sign dileptons. With a data sample corresponding to an integrated luminosity of 34 inverse picobarns, no excess above the standard model background predictions is observed and a b' quark with a mass between 255 and 361 GeV/c2̂ is excluded at the 95% confidence level.