The Development Of Missing Transverse Momentum Reconstruction With The Atlas Detector Using The Pufit Algorithm In Pp Collisions At 13 Tev
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The Development Of Missing Transverse Momentum Reconstruction With The Atlas Detector Using The Pufit Algorithm In Pp Collisions At 13 Tev
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Author : Zhelun Li
language : en
Publisher:
Release Date : 2019
The Development Of Missing Transverse Momentum Reconstruction With The Atlas Detector Using The Pufit Algorithm In Pp Collisions At 13 Tev written by Zhelun Li 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.
Many interesting physical processes produce non-interacting particles that could only be measured using the missing transverse momentum. The increase of the proton beam intensity in the Large Hadron Collider (LHC) provides sensitivity to rare physics processes while inevitably increasing the number of simultaneous proton collisions in each event. The missing transverse momentum (MET) is a variable of great interest, defined as the negative sum of the transverse momentum of all visible particles. The precision of the MET determination deteriorates as the complexity of the recorded data escalates. Given the current complexity of data analysis, a new algorithm is developed to effectively determine the MET. Several well-understood physics processes were used to test the effectiveness of the newly designed algorithm. The performance of the new algorithm is also compared to that of the standard algorithm used in the ATLAS experiment.
Performance Of The Cms Missing Transverse Momentum Reconstruction In Pp Data At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2015
Performance Of The Cms Missing Transverse Momentum Reconstruction In Pp Data 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 2015 with categories.
The performance of missing transverse energy reconstruction algorithms is presented by our team using√s=8 TeV proton-proton (pp) data collected with the CMS detector. Events with anomalous missing transverse energy are studied, and the performance of algorithms used to identify and remove these events is presented. The scale and resolution for missing transverse energy, including the effects of multiple pp interactions (pileup), are measured using events with an identified Z boson or isolated photon, and are found to be well described by the simulation. Novel missing transverse energy reconstruction algorithms developed specifically to mitigate the effects of large numbers of pileup interactions on the missing transverse energy resolution are presented. These algorithms significantly reduce the dependence of the missing transverse energy resolution on pileup interactions. Furthermore, an algorithm that provides an estimate of the significance of the missing transverse energy is presented, which is used to estimate the compatibility of the reconstructed missing transverse energy with a zero nominal value.
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 Physics In Pp Collisions In Final States With Tau Leptons B Jets And Missing Transverse Momentum With The Atlas Detector In Lhc Run 2
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Author : Ferdinand Krieter
language : en
Publisher:
Release Date : 2021
Search For New Physics In Pp Collisions In Final States With Tau Leptons B Jets And Missing Transverse Momentum With The Atlas Detector In Lhc Run 2 written by Ferdinand Krieter and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with Jets categories.
Muon Reconstruction Performance Of The Atlas Detector In Proton U2013 Proton Collision Data At U221a S
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Author :
language : en
Publisher:
Release Date : 2016
Muon Reconstruction Performance Of The Atlas Detector In Proton U2013 Proton Collision Data 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 2016 with categories.
This article documents the performance of the ATLAS muon identification and reconstruction using the LHC dataset recorded at √s=13 TeV in 2015. Using a large sample of J/? → ?? and Z → ?? decays from 3.2 fb-1 of pp collision data, measurements of the reconstruction efficiency, as well as of the momentum scale and resolution, are presented and compared to Monte Carlo simulations. Furthermore, the reconstruction efficiency is measured to be close to 99% over most of the covered phase space (
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.
Measurement Of Vh H Bb Production As A Function Of The Vector Boson Transverse Momentum In 13 Tev Pp Collisions With The Atlas Detector
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Author : Anne Kathrin Becker
language : en
Publisher:
Release Date : 2019
Measurement Of Vh H Bb Production As A Function Of The Vector Boson Transverse Momentum In 13 Tev Pp Collisions With The Atlas Detector written by Anne Kathrin Becker 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.
Abstract: Cross-sections of associated production of a Higgs boson decaying into bottomquark pairs and an electroweak gauge boson, W or Z, decaying into leptons are measured as a function of the gauge boson transverse momentum. The measurements are performed in kinematic fiducial volumes defined in the 'simplified template cross-section' framework. The results are obtained using 79.8 fb−1 of proton-proton collisions recorded by the ATLAS detector at the Large Hadron Collider at a centre-of-mass energy of 13 TeV. All measurements are found to be in agreement with the Standard Model predictions, and limits are set on the parameters of an effective Lagrangian sensitive to modifications of the Higgs boson couplings to the electroweak gauge bosons
Search For High Mass States With One Lepton Plus Missing Transverse Momentum In Proton Proton Collisions At Sqrt S With The Atlas Detector
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Author :
language : en
Publisher:
Release Date : 2012
Search For High Mass States With One Lepton Plus Missing Transverse Momentum In Proton Proton Collisions At Sqrt S 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 2012 with categories.
The ATLAS detector is used to search for high-mass states, such as heavy charged gauge bosons (W′,W*), decaying to a charged lepton (electron or muon) and a neutrino. Results are presented based on the analysis of ppcollisions at a center-of-mass energy of 7 TeV corresponding to an integrated luminosity of 36 pb−1. No excess beyond standard model expectations is observed. A W′ with sequential standard model couplings is excluded at 95% confidence level for masses below 1.49 TeV, and a W* (charged chiral boson) for masses below 1.35 TeV.
Measurements Of Zh And Wh Production In The H Bb Decay Channel In Pp Collisions At 13 Tev With The Atlas Detector
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Author : ATLAS Collaboration CERN
language : en
Publisher:
Release Date : 2020
Measurements Of Zh And Wh Production In The H Bb Decay Channel In Pp Collisions At 13 Tev With The Atlas Detector 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 2020 with categories.
Abstract: Measurements are presented of the Standard Model Higgs boson decaying into a bb ̄ pair and produced in association with a W or Z boson decaying into leptons, using proton-proton collision data collected between 2015 and 2018 by the ATLAS detector. The measurements use data delivered by the Large Hadron Collider at a centre-of-mass energy of s√=13 TeV, corresponding to an integrated luminosity of 139 fb−1. The production of a Higgs boson in association with a W or Z boson is established, with observed (expected) significances of 4.0 (4.1) and 5.3 (5.1) standard deviations, respectively. Cross-sections of associated production of a Higgs boson decaying into bottom quark pairs with an electroweak gauge boson, W or Z, decaying into leptons are measured as a function of the gauge boson transverse momentum in kinematic fiducial volumes. The cross-section measurements are all consistent with the Standard Model expectations, and the total uncertainties vary from 30% in the high gauge boson transverse momentum regions to 85% in the low regions
Search For New Phenomena In Final States With Large Jet Multiplicities And Missing Transverse Momentum With Atlas Using
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Author :
language : en
Publisher:
Release Date : 2016
Search For New Phenomena In Final States With Large Jet Multiplicities And Missing Transverse Momentum With Atlas Using 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 are reported of a search for new phenomena, such as supersymmetric particle production, that could be observed in high-energy proton–proton collisions. Events with large numbers of jets, together with missing transverse momentum from unobserved particles, are selected. The data analysed were recorded by the ATLAS experiment during 2015 using the 13 TeV centre-of-mass proton–proton collisions at the Large Hadron Collider, and correspond to an integrated luminosity of 3.2 fb-1. The search selected events with various jet multiplicities from ≥7 to ≥10 jets, and with various b-jet multiplicity requirements to enhance sensitivity. Furthermore, no excess above Standard Model expectations is observed. The results are interpreted within two supersymmetry models, where gluino masses up to 1400 GeV are excluded at 95% confidence level, significantly extending previous limits.