Contribution To The Construction Of The Insertable B Layer Of Atlas For High Luminosity Upgrade And Research For Invisible Higgs
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Contribution To The Construction Of The Insertable B Layer Of Atlas For High Luminosity Upgrade And Research For Invisible Higgs
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Author : Ahmed Bassalat
language : en
Publisher:
Release Date : 2015
Contribution To The Construction Of The Insertable B Layer Of Atlas For High Luminosity Upgrade And Research For Invisible Higgs written by Ahmed Bassalat 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.
For Run 2 of the LHC a fourth, innermost Pixel Detector layer on a smaller radius beampipe has been installed in the ATLAS Detector to add redundancy against radiation damage ofthe current Pixel Detector and to ensure a high quality tracking and b-tagging performance ofthe Inner Detector over the coming years until the High Luminosity Upgrade. State of the artcomponents have been produced and assembled onto support structures known as staves overthe last two years. In total, 20 staves have been built and qualified in a designated QualityAssurance setup at CERN of which 14 have been integrated onto the beam pipe. In the secondpart, A search for a Higgs boson produced via vector-boson fusion and decaying into invisibleparticles is discussed, using 20.3 fb-1 of proton proton collision data at the centre of massenergy of 8 TeV recorded by the ATLAS detector at the LHC. For a Higgs boson with a massof 125 GeV, assuming the Standard Model production cross section, an upper bound of 0.28is set on the branching fraction of H →invisible at 90% confidence level, where the expectedupper limit is 0.31. The results are interpreted in model of Higgs portal dark matter where thebranching fraction limit is converted into upper bounds on the dark matter nucleon scatteringcross section as a function of the dark matter particle mass, and compared to results from thedirect dark matter detection experiments.
Upgrade Of The Atlas Experiment Inner Tracker And Related Physics Perspectives Of The Higgs Boson Decay Into Two B Quarks
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Author : Audrey Ducourthial
language : en
Publisher:
Release Date : 2018
Upgrade Of The Atlas Experiment Inner Tracker And Related Physics Perspectives Of The Higgs Boson Decay Into Two B Quarks written by Audrey Ducourthial and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
By 2027, the LHC will enter its high luminosity regime, providing protons protons collisions at an unprecedented rate. The LHC experiments whill have to be upgraded to cope with this higher data rate. The new ATLAS Inner Tracker (ITk) will allow a better identification of b-quarks and interesting physics signature with b-quarks in the final states such as the Higgs trilinear coupling will be reachable. The work performed during this thesis consisted in testing planar pixel sensors for the ITk, as well as optimizing b-tagging algorithms. In parallel, a study on the radiation damage on silicon pixel sensors have been performed. The radiation hardness of silicon sensors plays a determinant role as it allows them to be efficient in the highly radiative environment at LHC. Understanding the impact of radiation in silicon sensors is a major challenge and a radiation damage digitizer which models radiation damage effects in ATLAS Monte Carlo simulations is currently developed by the ATLAS experiment. Three ITk silicon planar pixel sensors productions of LPNHE and FBK have been developed, produced and tested on beam. Sensors from these three productions aim to be part of the ITk and have to demonstrate good performance after being irradiated at high fluences. Several technological designs have been investigated, such as temporary metal biasing option and active edges which maximize the geometrical acceptance of the sensors. The optimization of b-tagging SV1 algorithm (a secondary-vertex based algorithm) will be pre- sented as well as a study on the extrapolation of b-tagging performances at high pT.
Production Integration And Commissioning Of The Atlas Insertable B Layer And Test Beam Studies Of New Pixel Technologies For The Hl Lhc
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Author : Javier Bilbao De Mendizabal
language : en
Publisher:
Release Date : 2016
Production Integration And Commissioning Of The Atlas Insertable B Layer And Test Beam Studies Of New Pixel Technologies For The Hl Lhc written by Javier Bilbao De Mendizabal 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.
Discovery And Measurement Of The Higgs Boson In The Ww Decay Channel
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Author : David Hall
language : en
Publisher: Springer
Release Date : 2015-06-15
Discovery And Measurement Of The Higgs Boson In The Ww Decay Channel written by David Hall and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-06-15 with Science categories.
This thesis describes the stand-alone discovery and measurement of the Higgs boson in its decays to two W bosons using the Run-I ATLAS dataset. This is the most precise measurement of gluon-fusion Higgs boson production and is among the most significant results attained at the LHC. The thesis provides an exceptionally clear exposition on a complicated analysis performed by a large team of researchers. Aspects of the analysis performed by the author are explained in detail; these include new methods for evaluating uncertainties on the jet binning used in the analysis and for estimating the background due to associated production of a W boson and an off-shell photon. The thesis also describes a measurement of the WW cross section, an essential background to Higgs boson production. The primary motivation of the LHC was to prove or disprove the existence of the Higgs boson. In 2012, CERN announced this discovery and the resultant ATLAS publication contained three decay channels: gg, ZZ, and WW.
Constraints On New Phenomena Via Higgs Boson Couplings And Invisible Decays With The Atlas Detector
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Author : Simone Amoroso
language : en
Publisher:
Release Date : 2015
Constraints On New Phenomena Via Higgs Boson Couplings And Invisible Decays With The Atlas Detector written by Simone Amoroso 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.
Aspects Of The Atlas Itk Inner Tracker Development For The High Luminosity Upgrade Of The Large Hadron Collider
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Author : Jonas Steentoft
language : en
Publisher:
Release Date : 2022
Aspects Of The Atlas Itk Inner Tracker Development For The High Luminosity Upgrade Of The Large Hadron Collider written by Jonas Steentoft and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
Insertable B Layer
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Author : ATLAS Collaboration
language : en
Publisher:
Release Date : 2010
Insertable B Layer written by ATLAS Collaboration and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Erratum To Study Of The Spin And Parity Of The Higgs Boson In Diboson Decays With The Atlas Detector
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Author : Simone Amoroso
language : en
Publisher:
Release Date : 2016
Erratum To Study Of The Spin And Parity Of The Higgs Boson In Diboson Decays With The Atlas Detector written by Simone Amoroso 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.
Search For The Bb Decay Of The Standard Model Higgs Boson In Associated W Z H Production With The Atlas Detector
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Author : Simone Amoroso
language : en
Publisher:
Release Date : 2015
Search For The Bb Decay Of The Standard Model Higgs Boson In Associated W Z H Production With The Atlas Detector written by Simone Amoroso 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.
Constraints On New Phenomena Via Higgs Boson Couplings And Invisible Decays With The Atlas Detector
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Author :
language : en
Publisher:
Release Date : 2015
Constraints On New Phenomena Via Higgs Boson Couplings And Invisible Decays With The Atlas Detector written by 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.
The ATLAS experiment at the LHC has measured the Higgs boson couplings and mass, and searched for invisible Higgs boson decays, using multiple production and decay channels with up to 4.7 fb-1 of pp collision data at √s=7 TeV and 20.3 fb-1 at √s=8 TeV. In the current study, the measured production and decay rates of the observed Higgs boson in the [gamma][gamma], ZZ, W W , Z[gamma], bb, [tau] [tau] , and [mu][mu] decay channels, along with results from the associated production of a Higgs boson with a top-quark pair, are used to probe the scaling of the couplings with mass. The limits are set on parameters in extensions of the Standard Model including a composite Higgs boson, an additional electroweak singlet, and two-Higgs-doublet models. Together with the measured mass of the scalar Higgs boson in the [gamma][gamma] and ZZ decay modes, a lower limit is set on the pseudoscalar Higgs boson mass of mA > 370 GeV in the "hMSSM" simplified Minimal Supersymmetric Standard Model. Results from direct searches for heavy Higgs bosons are also interpreted in the hMSSM. Finally, direct searches for invisible Higgs boson decays in the vector-boson fusion and associated production of a Higgs boson with W/Z (Z → ll, W/Z → jj) modes are statistically combined to set an upper limit on the Higgs boson invisible branching ratio of 0.25. As a result, the use of the measured visible decay rates in a more general coupling fit improves the upper limit to 0.23, constraining a Higgs portal model of dark matter.