Search for Single Production of a Vector-like Quark Via a Heavy Gluon in the 4b Final State with the ATLAS Detector in Pp Collisions at [mml PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Search for Single Production of a Vector-like Quark Via a Heavy Gluon in the 4b Final State with the ATLAS Detector in Pp Collisions at [mml PDF full book. Access full book title Search for Single Production of a Vector-like Quark Via a Heavy Gluon in the 4b Final State with the ATLAS Detector in Pp Collisions at [mml by . Download full books in PDF and EPUB format.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 20
Get Book Here
Book Description
In this study, a search is performed for the process pp → G* → BH$\bar{b}$/$\bar{B}$Hb → H$b\bar{b}$→ $b\bar{b}b\bar{b}$, predicted in composite Higgs scenarios, where G* is a heavy colour octet vector resonance and BHBH a vector-like quark of charge -1/3. The data were obtained from pp collisions at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 19.5 fb-1, recorded by the ATLAS detector at the LHC. The largest background, multijet production, is estimated using a data-driven method. No significant excess of events with respect to Standard Model predictions is observed, and upper limits on the production cross section times branching ratio are set. Comparisons to the predictions from a specific benchmark model are made, resulting in lower mass limits in the two-dimensional mass plane of mG* vs. mBH.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 20
Get Book Here
Book Description
In this study, a search is performed for the process pp → G* → BH$\bar{b}$/$\bar{B}$Hb → H$b\bar{b}$→ $b\bar{b}b\bar{b}$, predicted in composite Higgs scenarios, where G* is a heavy colour octet vector resonance and BHBH a vector-like quark of charge -1/3. The data were obtained from pp collisions at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 19.5 fb-1, recorded by the ATLAS detector at the LHC. The largest background, multijet production, is estimated using a data-driven method. No significant excess of events with respect to Standard Model predictions is observed, and upper limits on the production cross section times branching ratio are set. Comparisons to the predictions from a specific benchmark model are made, resulting in lower mass limits in the two-dimensional mass plane of mG* vs. mBH.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 20
Get Book Here
Book Description
In this study, a search is performed for the process pp → G* → BH$ar{b}$/$ar{B}$Hb → H$bar{b}$→ $bar{b}bar{b}$, predicted in composite Higgs scenarios, where G* is a heavy colour octet vector resonance and BHBH a vector-like quark of charge –1/3. The data were obtained from pp collisions at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 19.5 fb–1, recorded by the ATLAS detector at the LHC. The largest background, multijet production, is estimated using a data-driven method. No significant excess of events with respect to Standard Model predictions is observed, and upper limits on the production cross section times branching ratio are set. Comparisons to the predictions from a specific benchmark model are made, resulting in lower mass limits in the two-dimensional mass plane of mG* vs. mBH.
Author: Ferdinand Schenck
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 30
Get Book Here
Book Description
A search for single top-quark production via flavour-changing neutral current processes from gluon plus up- or charm-quark initial states in proton-proton collisions at the LHC is presented. Data collected with the ATLAS detector in 2012 at a centre-of-mass energy of 8 TeV and corresponding to an integrated luminosity of 20.3 fb-1 are used. Furthermore, candidate events for a top quark decaying into a lepton, a neutrino and a jet are selected and classified into signal- and background-like candidates using a neural network.
Author: Diedi Hu
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
In the chiral B scenario with a 100% branching ratio of the decay B->Wt, the observed (expected) 95% CL lower limit on the B mass is 814 GeV (756 GeV).
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 23
Get Book Here
Book Description
A search is performed for a massive new vector-like quark T, with charge 2/3, that is pair produced together with its antiparticle in proton-proton collisions. The data were collected by the CMS experiment at the Large Hadron Collider in 2012 at sqrt(s) = 8 TeV and correspond to an integrated luminosity of 19.5 inverse femtobarns. The T quark is assumed to decay into three different final states, bW, tZ, and tH. The search is carried out using events with at least one isolated lepton. No deviations from standard model expectations are observed, and lower limits are set on the T quark mass at 95% confidence level. The lower limit lies between 687 and 782 GeV for all possible values of the branching fractions into the three different final states assuming strong production. These limits are the most stringent constraints to date on the existence of such a quark.
Author: Dustin Biedermann
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
Author: Harish Potti
Publisher:
ISBN:
Category :
Languages : en
Pages : 300
Get Book Here
Book Description
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
Author: Laura Rehnisch
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
