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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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.
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.
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.
First Measurement Of Hadronic Event Shapes In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2011
First Measurement Of Hadronic Event Shapes 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 2011 with categories.
Hadronic event shapes have been measured in proton-proton collisions at sqrt(s)=7 TeV, with a data sample collected with the CMS detector at the LHC. The sample corresponds to an integrated luminosity of 3.2 inverse picobarns. Event-shape distributions, corrected for detector response, are compared with five models of QCD multijet production.
Measurement Of Event Shapes In Proton Antiproton Collisions At Center Of Mass Energy 1 96 Tev
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Author :
language : en
Publisher:
Release Date : 2011
Measurement Of Event Shapes In Proton Antiproton Collisions At Center Of Mass Energy 1 96 Tev 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.
A study of event shape observables in proton-antiproton collisions at √s = 1.96 TeV is presented. The data for this analysis were recorded by the CDF II detector at the Tevatron collider. The variables studied are the transverse thrust and thrust minor, both defined in the plane perpendicular to the beam direction. The observables are measured using energies from unclustered calorimeter cells. In addition to studies of the differential distributions, we present the dependence of event shape mean values on the leading jet transverse energy. Data are compared with pythia Tune A and to resummed parton level predictions that were matched to fixed order results at NLO accuracy (NLO+NLL). Predictions from pythia Tune A agree fairly well with the data. However, the underlying event contributes significantly to these observables, making it difficult to make direct comparisons to the NLO+NLL predictions, which do not account for the underlying event. To overcome this difficulty, we introduce a new observable, a weighted difference of the mean values of the thrust and thrust minor, which is less sensitive to the underlying event, allowing for a comparison with NLO+NLL. Both pythia Tune A and the NLO+NLL calculations agree well within the 20% theoretical uncertainty with the data for this observable, indicating that perturbative QCD successfully describes shapes of the hadronic final states.
Measurement Of The Z T63 1hn T63 1hn Z Tau Tau Production Cross Section In Proton Proton Collisions At 7 Tev Center Of Mass Energy With The Atlas Detector
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Author : Daniele Capriotti
language : en
Publisher:
Release Date : 2012
Measurement Of The Z T63 1hn T63 1hn Z Tau Tau Production Cross Section In Proton Proton Collisions At 7 Tev Center Of Mass Energy With The Atlas Detector written by Daniele Capriotti 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.
Properties Of Jets Measured With Charged Particles With The Atlas Detector At The Large Hadron Collider
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Author : Seth Conrad Zenz
language : en
Publisher:
Release Date : 2011
Properties Of Jets Measured With Charged Particles With The Atlas Detector At The Large Hadron Collider written by Seth Conrad Zenz 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.
Jets are identified and their properties studied, in proton-proton collisions at the Large Hadron Collider at center-of-mass energy √s = 7 TeV, using charged particles measured by the ATLAS Inner Detector. Events are selected using a minimum bias trigger, allowing jets at very low transverse momentum to be observed and the tran- sition to high-momentum fully perturbative jets to be studied. Jets are reconstructed using the anti-kt algorithm applied to charged particles with two radius parameter choices, 0.4 and 0.6. An inclusive charged jet transverse momentum cross section measurement from 4 GeV to 100 GeV is shown, for four ranges in rapidity extending to 1.9, and corrected to charged particle-level truth jets. The transverse momenta and longitudinal momentum fractions of charged particles within jets are measured, along with the charged particle multiplicity and the particle density as a function of radial distance from the jet axis. Comparison of the data with the theoretical models implemented in existing tunings of Monte Carlo event generators indicates reasonable overall agreement between data and Monte Carlo. These comparisons are sensitive to Monte Carlo parton showering, hadronization, and soft physics models.
Precision Measurement Of Jets At The Atlas Experiment
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Author : Gareth John Ashley Brown
language : en
Publisher:
Release Date : 2013
Precision Measurement Of Jets At The Atlas Experiment written by Gareth John Ashley Brown 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.
This thesis describes the measurements of jet activity in the rapidity region between a dijet system formed in proton-proton collisions at a centre-of-mass energy of 7 TeV. The data used were collected by the ATLAS detector during 2010 at the Large Hadron Collider at CERN. A number of observables that probe additional quark and gluon radiation in the dijet topology are studied. The development and performance of the monitoring system for the ATLAS calorimeter high level trigger is described. The performance of the jet calibration and a study of the properties of jets in the forward calorimeter is also given. The fraction of events that survive a veto on jets with transverse momentum above a jet veto scale, Q0, in the rapidity region between the dijet system is measured for dijets with mean transverse momentum 50
Atlas B Jet Identification Performance And Efficiency Measurement With Tt Over Bar Events In Pp Collisions At Square Root S
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Author : ATLAS Collaboration CERN
language : en
Publisher:
Release Date : 2019
Atlas B Jet Identification Performance And Efficiency Measurement With Tt Over Bar Events In Pp Collisions At Square Root S 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 2019 with categories.
Abstract: The algorithms used by the ATLAS Collaboration during Run 2 of the Large Hadron Collider to identify jets containing b-hadrons are presented. The performance of the algorithms is evaluated in the simulation and the efficiency with which these algorithms identify jets containing b-hadrons is measured in collision data. The measurement uses a likelihood-based method in a sample highly enriched in tt ̄ events. The topology of the t→Wb decays is exploited to simultaneously measure both the jet flavour composition of the sample and the efficiency in a transverse momentum range from 20 to 600 GeV. The efficiency measurement is subsequently compared with that predicted by the simulation. The data used in this measurement, corresponding to a total integrated luminosity of 80.5 fb−1, were collected in proton-proton collisions during the years 2015-2017 at a centre-of-mass energy s√= 13 TeV. By simultaneously extracting both the efficiency and jet flavour composition, this measurement significantly improves the precision compared to previous results, with uncertainties ranging from 1 to 8% depending on the jet transverse momentum
A Measurement Of The Proton Proton Inelastic Scattering Cross Section At Sqrt S
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Author : Lauren Alexandra Tompkins
language : en
Publisher:
Release Date : 2011
A Measurement Of The Proton Proton Inelastic Scattering Cross Section At Sqrt S written by Lauren Alexandra Tompkins 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.
The first measurement of the inelastic cross-section for proton-proton collisions at a center of mass energy of 7 TeV using the ATLAS detector at the Large Hadron Collider is presented. From a dataset corresponding to an integrated luminosity of 20 inverse microbarns, events are selected by requiring activity in scintillation counters mounted in the forward region of the ATLAS detector. An inelastic cross-section of 60.1 +/- 2.1 millibarns is measured for the subset of events visible to the scintillation counters. The uncertainty includes the statistical and systematic uncertainty on the measurement. The visible events satisfy [xi]> 5\times 10-6, where [xi]=MX2/s is calculated from the invariant mass, MX, of hadrons selected using the largest rapidity gap in the event. For diffractive events this corresponds to requiring at least one of the dissociation masses to be larger than 15.7~GeV. Using an extrapolation dependent on the model for the differential diffractive mass distribution, an inelastic cross-section of 69.1 +/- 2.4 (exp) +/- 6.9 (extr) millibarns is determined, where (exp) indicates the experimental uncertainties and (extr) indicates the uncertainty due to the extrapolation from the limited [xi]-range to the full inelastic cross-section.