Search For Non Prompt Photons In A Diphoton And Large Missing Transverse Momentum Final State At The Atlas Detector
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Search For Non Prompt Photons In A Diphoton And Large Missing Transverse Momentum Final State At The Atlas Detector
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Author : Allan Lehan
language : en
Publisher:
Release Date : 2015
Search For Non Prompt Photons In A Diphoton And Large Missing Transverse Momentum Final State At The Atlas Detector written by Allan Lehan 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 New Physics In Tt Final States With Additional Heavy Flavor Jets With The Atlas Detector
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Author : Javier Montejo Berlingen
language : en
Publisher: Springer
Release Date : 2016-07-20
Search For New Physics In Tt Final States With Additional Heavy Flavor Jets With The Atlas Detector written by Javier Montejo Berlingen and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-07-20 with Science categories.
This doctoral thesis focuses on the search for new phenomena in top-antitop quark (tt) final states with additional b-quark jets at the LHC. It uses the full Run 1 dataset collected by the ATLAS experiment in proton-proton collisions at √s=8 TeV. The final state of interest consists of an isolated lepton, a neutrino and at least six jets with at least four b-tagged jets, a challenging experimental signature owing to the large background from tt+heavy-flavor production. This final state is characteristic of ttH production, with the Higgs boson decaying into bb, a process that allows direct probing of the top-Higgs Yukawa coupling. This signature is also present in many extensions of the Standard Model that have been proposed as solutions to the hierarchy problem, such as supersymmetry or composite Higgs models, which predict the pair production of bosonic or fermionic top quark partners, or the anomalous production of four-top-quark events. All these physics processes have been searched for using an ambitious search strategy that has been developed on the basis of a combination of state-of-art theoretical predictions and a sophisticated statistical analysis to constrain in-situ the large background uncertainties. As a result, the most restrictive bounds to date on the above physics processes have been obtained.
Search For Nonpointing And Delayed Photons In The Diphoton And Missing Transverse Momentum Final State In 8 Tev Math Display
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Author :
language : en
Publisher:
Release Date : 2014
Search For Nonpointing And Delayed Photons In The Diphoton And Missing Transverse Momentum Final State In 8 Tev Math Display 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.
We performed a search, using the full 20.3 fb1 data sample of 8 TeV proton-proton collisions collected in 2012 with the ATLAS detector at the LHC, for photons originating from a displaced vertex due to the decay of a neutral long-lived particle into a photon and an invisible particle. The analysis investigates the diphoton plus missing transverse momentum final state, and is therefore most sensitive to pair production of long-lived particles. The analysis technique exploits the capabilities of the ATLAS electromagnetic calorimeter to make precise measurements of the flight direction, as well as the time of flight, of photons. No excess is observed over the Standard Model predictions for background. Lastly, exclusion limits are set within the context of gauge mediated supersymmetry breaking models, with the lightest neutralino being the next-to-lightest supersymmetric particle and decaying into a photon and gravitino with a lifetime in the range from 250 ps to about 100 ns.
Search For Non Pointing Photons In The Diphoton And Missing Transverse Energy Final State In 7 Tev Pp Collisions Using The Atlas Detector
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Author : Nikiforos Nikiforou
language : en
Publisher:
Release Date : 2014
Search For Non Pointing Photons In The Diphoton And Missing Transverse Energy Final State In 7 Tev Pp Collisions Using The Atlas Detector written by Nikiforos Nikiforou 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.
The gravitinos escape the detector, giving rise to missing energy, while the photons can appear not to originate from the primary vertex of the event, and are measured with a delay with respect to the collision time. No excess was observed above the background expected from Standard Model processes. The results were used to set exclusion limits at 95% CL in the two-dimensional parameter space defined by the supersymmetry breaking scale and the lifetime of the lightest neutralino.
Search For Universal Extra Dimensions In The Two Photon And Missing Transverse Energy Final State With The Atlas Detector
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Author : Baharak Fatholahzadeh
language : en
Publisher:
Release Date : 2012
Search For Universal Extra Dimensions In The Two Photon And Missing Transverse Energy Final State With The Atlas Detector written by Baharak Fatholahzadeh 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.
Search For New Phenomena In Events With A Photon And Missing Transverse Momentum In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2016
Search For New Phenomena In Events With A Photon And Missing Transverse Momentum 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.
In this paper, results of a search for new phenomena in events with an energetic photon and large missing transverse momentum with the ATLAS experiment at the Large Hadron Collider are reported. The data were collected in proton-proton collisions at a centre-of-mass energy of 13 TeV and correspond to an integrated luminosity of 3.2 fb-1. The observed data are in agreement with the Standard Model expectations. Exclusion limits are presented in models of new phenomena including pair production of dark matter candidates or large extra spatial dimensions. In a simplified model of dark matter and an axial-vector mediator, the search excludes mediator masses below 710 GeV for dark matter candidate masses below 150 GeV. In an effective theory of dark matter production, values of the suppression scale M * up to 570 GeV are excluded and the effect of truncation for various coupling values is reported. Finally, for the ADD large extra spatial dimension model the search places more stringent limits than earlier searches in the same event topology, excluding M D up to about 2.3 (2.8) TeV for two (six) additional spatial dimensions; the limits are reduced by 20-40% depending on the number of additional spatial dimensions when applying a truncation procedure.
Search For Diphoton Events With Large Missing Transverse Energy In 7 Tev Proton Proton Collisions With The Atlas Detector
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Author :
language : en
Publisher:
Release Date : 2013
Search For Diphoton Events With Large Missing Transverse Energy In 7 Tev Proton Proton Collisions 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 2013 with categories.
Search For New Phenomena In Final States With An Energetic Jet And Large Missing Transverse Momentum In Pp Collisions At S
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Author :
language : en
Publisher:
Release Date : 2016
Search For New Phenomena In Final States With An Energetic Jet And Large Missing Transverse Momentum 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.
Results of a search for new phenomena in final states with an energetic jet and large missing transverse momentum are reported. The search uses proton-proton collision data corresponding to an integrated luminosity of 3.2 fb–1 at √s=13 TeV collected in 2015 with the ATLAS detector at the Large Hadron Collider. Events are required to have at least one jet with a transverse momentum above 250 GeV and no leptons. Several signal regions are considered with increasing missing-transverse-momentum requirements between EmissT > 250 GeV and EmissT > 700 GeV. Good agreement is observed between the number of events in data and Standard Model predictions. Here, the results are translated into exclusion limits in models with large extra spatial dimensions, pair production of weakly interacting dark-matter candidates, and the production of supersymmetric particles in several compressed scenarios.
Search For New Phenomena In Monophoton Final States In Proton Proton Collisions At Mml
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Author :
language : en
Publisher:
Release Date : 2016
Search For New Phenomena In Monophoton Final States In Proton Proton Collisions At Mml 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.
In this paper, results are presented from a search for new physics in final states containing a photon and missing transverse momentum. The data correspond to an integrated luminosity of 19.6 fb-1 collected in proton-proton collisions at √s = 8 TeV with the CMS experiment at the LHC. No deviation from the standard model predictions is observed for these final states. New, improved limits are set on dark matter production and on parameters of models with large extra dimensions. In particular, the first limits from the LHC on branon production are found and significantly extend previous limits from LEP and the Tevatron. Finally, an upper limit of 14.0 fb on the cross section is set at the 95% confidence level for events with a monophoton final state with photon transverse momentum greater than 145 GeV and missing transverse momentum greater than 140 GeV.
Search For Large Extra Dimensions In Final States Containing One Photon Or Jet And Large Missing Transverse Energy Produced In P Anti P Collisions At S
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Author :
language : en
Publisher:
Release Date : 2008
Search For Large Extra Dimensions In Final States Containing One Photon Or Jet And Large Missing Transverse Energy Produced In P Anti 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 2008 with categories.
The authors present the results of searches for large extra dimensions in samples of events with large missing transverse energy E{sub T} and either a photon or a jet produced in p{bar p} collisions at √s = 1.96 TeV collected with the CDF II detector. For? + E{sub T} and jet + E{sub T} candidate samples corresponding to 2.0 fb−1 and 1.1 fb−1 of integrated luminosity respectively, they observe good agreement with standard model expectations and obtain a combined lower limit on the fundamental parameter of the large extra dimensions model, M{sub D}, as a function of the number of extra dimensions in the model.