A Study Of Missing Transverse Energy In Minimum Bias Events With In Time Pile Up At The Large Hadron Collider Using The Atlas Detector And Center Of Mass Energy
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A Study Of Missing Transverse Energy In Minimum Bias Events With In Time Pile Up At The Large Hadron Collider Using The Atlas Detector And Center Of Mass Energy
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Author : Kuhan Wang
language : en
Publisher:
Release Date : 2012
A Study Of Missing Transverse Energy In Minimum Bias Events With In Time Pile Up At The Large Hadron Collider Using The Atlas Detector And Center Of Mass Energy written by Kuhan Wang 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.
A Study Of Missing Transverse Energy In Minimum Bias Events With In Time Pile Up At The Large Hadron Collider Using The Atlas Detector And S
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Author : Kuhan Wang
language : en
Publisher:
Release Date : 2011
A Study Of Missing Transverse Energy In Minimum Bias Events With In Time Pile Up At The Large Hadron Collider Using The Atlas Detector And S written by Kuhan Wang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
A sample of? L dt = 3.67 pb{-1} of minimum bias events observed using the ATLAS detector at the Large Hadron Collider at s=7 TeV is analyzed for Missing Transverse Energy (MET) response in the presence of in-time pile-up. We find that the MET resolution (ox, y) is consistent with a simple model of the detector response for minimum bias events, scaling with respect to the sum of the scalar energy ($\sum E_\text{T}$) as $\sigma_\text{X, Y}=A\sqrt{\sum E_\text{T} }$. This behavior is observed in the presence of in-time pile-up and does not vary with global calibration schemes. We find a bias in the mean ($\mu_\text{X, Y}$) of the MET that is linear with respect to $\sum E_\text{T}$, leading to an asymmetry in the $\phi_\text{X, Y}$ distribution of the MET. We propose an explanation for this problem in terms of a misalignment of the nominal center of the ATLAS detector with respect to its real center. We contrast the data with a Monte Carlo sample produced using PYTHIA. We find that the resolution, bias and asymmetry are all approximately reproduced in simulation.
Search For Diphoton Events With Missing Transverse Energy With The Atlas Detector At The Lhc
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Author : Andrea Michelle Bangert
language : en
Publisher:
Release Date : 2011
Search For Diphoton Events With Missing Transverse Energy With The Atlas Detector At The Lhc written by Andrea Michelle Bangert and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Underlying Event Studies At Atlas And Cdf
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Author :
language : en
Publisher:
Release Date : 2011
Underlying Event Studies At Atlas And Cdf written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Improving our understanding and modeling of the underlying event in high energy collider environment is important for more precise measurements at the LHC. CDF Run II data for the underlying event associated with Drell-Yan lepton pair production and early ATLAS data measuring underlying event activity with respect to the leading transverse momentum track are presented. The data are compared with several QCD Monte Carlo models. It is seen that no current standard Monte Carlo tune adequately describes all the early ATLAS data and CDF data simultaneously. The underlying event observables presented here are particularly important for constraining the energy evolution of multiple parton interaction models. One of the goals of these analyses is to provide data that can be used to test and improve MC models for current and future physics studies at the LHC. The underlying event observables presented here are particularly important for constraining the energy evolution of multiple partonic interaction models, since the plateau heights of the underlying event profiles are highly correlated to multiple parton interaction activity. The data at 7 TeV are crucial for MC tuning, since measurements are needed with at least two energies to constrain the energy evolution of MPI activity. PYTHIA tune A and tune AW do a good job in describing the CDF data on the underlying-event observables for leading jet and Drell-Yan events, respectively, although the agreement between predictions and data is not perfect. The leading-jet data show slightly more activity in the underlying event than PYTHIA Tune A, although they are very similar - which may indicate the universality of underlying event modeling. However, all pre-LHC MC models predict less activity in the transverse region (i.e in the underlying event) than is actually observed in ATLAS leading track data, for both center-of-mass energies. There is therefore no current standard MC tune which adequately describes all the early ATLAS data. However, using diffraction-limited minimum bias distributions and the plateau of the underlying event distributions presented here, ATLAS has developed a new PYTHIA tune AMBT1 (ATLAS Minimum Bias Tune 1) and a new HERWIG+ JIMMY tune AUET1 (ATLAS Underlying Event Tune 1) which model the p{sub T} and charged multiplicity spectra significantly better than the pre-LHC tunes of those generators. It is critical to have sensible underlying event models containing our best physical knowledge and intuition, tuned to all relevant available data.
An Examination Of Backgrounds To Early Run Minimum Bias Events In Atlas At The Lhc
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Author : Alden Reid Stradling
language : en
Publisher:
Release Date : 2008
An Examination Of Backgrounds To Early Run Minimum Bias Events In Atlas At The Lhc written by Alden Reid Stradling 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.
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.
Measurement Of Hadronic Event Shapes And Jet Substructure In Proton Proton Collisions At 7 0 Tev Center Of Mass Energy With The Atlas Detector At The Large Hadron Collider
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Author : David Wilkins Miller
language : en
Publisher:
Release Date : 2011
Measurement Of Hadronic Event Shapes And Jet Substructure In Proton Proton Collisions At 7 0 Tev Center Of Mass Energy With The Atlas Detector At The Large Hadron Collider written by David Wilkins Miller and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
This thesis presents the first measurement of 6 hadronic event shapes in proton-proton collisions at a center-of-mass energy of 7.0 TeV using the ATLAS detector at the Large Hadron Collider. Results are presented at the particle-level, permitting comparisons to multiple Monte Carlo event generator tools. Numerous tools and techniques that enable detailed analysis of the hadronic final state at high luminosity are described. The approaches presented utilize the dual strengths of the ATLAS calorimeter and tracking systems to provide high resolution and robust measurements of the hadronic jets that constitute both a background and a signal throughout ATLAS physics analyses. The study of the hadronic final state is then extended to jet substructure, where the energy flow and topology within individual jets is studied at the detector level and techniques for estimating systematic uncertainties for such measurements are commissioned in the first data. These first substructure measurements in ATLAS include the jet mass and sub-jet multiplicity as well as those concerned with multi-body hadronic decays and color flow within jets. Finally, the first boosted hadronic object observed at the LHC -- the decay of the top quark to a single jet -- is presented.
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.
Searches For Dijet Resonances
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Author : Lydia Audrey Beresford
language : en
Publisher: Springer
Release Date : 2018-09-04
Searches For Dijet Resonances written by Lydia Audrey Beresford and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-09-04 with Science categories.
This book addresses one of the most intriguing mysteries of our universe: the nature of dark matter. The results presented here mark a significant and substantial contribution to the search for new physics, in particular for new particles that couple to dark matter. The first analysis presented is a search for heavy new particles that decay into pairs of hadronic jets (dijets). This pioneering analysis explores unprecedented dijet invariant masses, reaching nearly 7 TeV, and sets constraints on several important new physics models. The two subsequent analyses focus on the difficult low dijet mass region, down to 200 GeV, and employ a novel technique to efficiently gather low-mass dijet events. The results of these analyses transcend the long-standing constraints on dark matter mediator particles set by several existing experiments.
Measurement Of Hadronic Event Shapes And Jet Substructure In Proton Proton Collisions At 7 0 Tev Center Of Mass Energy With The Atlas Detector At The Large Hadron Collider
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Author :
language : en
Publisher:
Release Date : 2012
Measurement Of Hadronic Event Shapes And Jet Substructure In Proton Proton Collisions At 7 0 Tev Center Of Mass Energy With The Atlas Detector At The Large Hadron Collider 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.
This thesis presents the first measurement of 6 hadronic event shapes in proton-proton collisions at a center-of-mass energy of √s = 7 TeV using the ATLAS detector at the Large Hadron Collider. Results are presented at the particle-level, permitting comparisons to multiple Monte Carlo event generator tools. Numerous tools and techniques that enable detailed analysis of the hadronic final state at high luminosity are described. The approaches presented utilize the dual strengths of the ATLAS calorimeter and tracking systems to provide high resolution and robust measurements of the hadronic jets that constitute both a background and a signal throughout ATLAS physics analyses. The study of the hadronic final state is then extended to jet substructure, where the energy flow and topology within individual jets is studied at the detector level and techniques for estimating systematic uncertainties for such measurements are commissioned in the first data. These first substructure measurements in ATLAS include the jet mass and sub-jet multiplicity as well as those concerned with multi-body hadronic decays and color flow within jets. Finally, the first boosted hadronic object observed at the LHC - the decay of the top quark to a single jet - is presented.