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2012 2012

Search for a Heavy Top-like Quark in Pp̄ Collisions at [square Root] S

Author: David J. Cox
Publisher:
ISBN: 9781267967893
Category :
Languages : en
Pages :

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Book Description
We present the results of a search for pair production of a heavy top-like (t') quark decaying to Wq final states using data corresponding to an integrated luminosity of 5.6 fb−1 collected by the CDF II detector in proton-antiproton collisions at [square root s] = 1.96 TeV center of mass energy. A searche for t' --> Wb in events containing a lepton and four or more jets is conducted. By performing a fit to the two-dimensional distribution of total transverse energy versus reconstructed t' quark mass, we set upper limits on the t't̄' pair production cross section and exclude a standard model fourth-generation t' quark decaying to Wb with mass below 358 GeV/c2 at 95% CL.

Search for a Heavy Top-like Quark in Pp̄ Collisions at [square Root] S

Author: David J. Cox
Publisher:
ISBN: 9781267967893
Category :
Languages : en
Pages :

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Search for a Heavy Bottom-like Quark in Pp Collisions at Sqrt(s)

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Book Description
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.

Search for the Top Quark in P̄p Collisions at [square Root Of]3

Author: John Joseph Walsh
Publisher:
ISBN:
Category :
Languages : en
Pages : 212

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Book Description

Search for Scalar Top Quark and Scalar Bottom Quark in Pp̄ Collisions at [square Root]S

Author: Christopher Matthew Holck
Publisher:
ISBN:
Category :
Languages : en
Pages : 207

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Book Description

Search for the Top Quark Decaying to a Charged Higgs Boson in P̄p Collisions at [square Root]s

Author: Jinsong Wang
Publisher:
ISBN:
Category : Higgs bosons
Languages : en
Pages : 198

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Book Description

Search for the Top Quark in the Dielectron Channel in Pp̄ Collisions at [square Root Of] S

Author: Balamurali V
Publisher:
ISBN:
Category :
Languages : en
Pages : 224

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Book Description

Search for a Vectorlike Quark with Charge 2/3 in T+Z Events from Pp Collisions at Sqrt[s]

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Book Description
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 Singly Produced Top Partners in Trilepton Final State Using Data Collected by the ATLAS Detector from Pp Collisions at [square Root] S

Author: Avik Roy (Ph. D.)
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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Book Description
This thesis presents the search for a heavy, up-type vector-like quark (VLQ), or Top Partner, with charge +2/3. Top Partners are predicted in well motivated models of new physics beyond the Standard Model. Having collected data with the ATLAS detector during 2015-2018 run of the LHC at a center-of-mass energy of 13 TeV, I describe in this dissertation an analysis searching for Top Partners produced by the fusion of a W boson and a bottom quark and decaying into a Z boson and a top quark with a kinematic signature of three leptons. Since the search performed by analyzing the data collected in 2015-16 does not provide sufficient evidence in favor of VLQ discovery, we set limits on Top Partner mass as a function of its coupling constants. In order to extend this search for the entire dataset collected by ATLAS in Run 2 and facilitate a general interpretation and combination of all single VLQ searches in ATLAS, a generalized, semi-analytical framework for model-independent interpretation of the results of a generic search for the single production of VLQs in terms of the free parameters in the VLQ Lagrangian is presented. Additional studies are performed to facilitate computationally manageable signal generation for a fine grid of VLQ mass and couplings, probe interference between VLQ and standard model processes, and quantify contribution of sub-dominant diagrams. Finally, an updated analysis strategy to expand the previously mentioned search for the entire Run 2 dataset is described with initial results for kinematic distributions as well as expected limits on cross-sections, Top Partner masses, and couplings

Search for Flavour-changing Neutral-current Interactions of a Top Quark and a Gluon in Pp Collisions at [square Root]s

Author: [Study Group] ATLAS Collaboration CERN
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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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

Author: ATLAS Collaboration CERN
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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Book Description
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