Download or read book Jet Energy Calibration at the LHC written by and published by . This book was released on 2015 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, jets are one of the most prominent physics signatures of high energy proton–proton (p–p) collisions at the Large Hadron Collider (LHC). They are key physics objects for precision measurements and searches for new phenomena. This review provides an overview of the reconstruction and calibration of jets at the LHC during its first Run. ATLAS and CMS developed different approaches for the reconstruction of jets, but use similar methods for the energy calibration. ATLAS reconstructs jets utilizing input signals from their calorimeters and use charged particle tracks to refine their energy measurement and suppress the effects of multiple p–p interactions (pileup). CMS, instead, combines calorimeter and tracking information to build jets from particle flow objects. Jets are calibrated using Monte Carlo (MC) simulations and a residual in situ calibration derived from collision data is applied to correct for the differences in jet response between data and Monte Carlo.
Download or read book Calibration of the Jet Energy Scale Using Top Quark Events at the LHC written by Petra van Mulders and published by . This book was released on 2010 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Jet Physics at the LHC written by Klaus Rabbertz and published by Springer. This book was released on 2016-10-11 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reviews the latest experimental results on jet physics from proton-proton collisons at the LHC. Jets allow to determine the strong coupling constant over a wide range of energies up the highest ones possible so far, and to constrain the gluon parton distribution of the proton, both of which are important uncertainties on theory predictions in general and for the Higgs boson in particular.A novel approach in this book is to categorize the examined quantities according to the types of absolute, ratio, or shape measurements and to explain in detail the advantages and differences. Including numerous illustrations and tables the physics message and impact of each observable is clearly elaborated.
Download or read book Measurement of the Inclusive Jet Cross Section with the ATLAS Detector at the Large Hadron Collider written by Caterina Doglioni and published by Springer Science & Business Media. This book was released on 2012-07-28 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tests of the current understanding of physics at the highest energies achievable in man-made experiments are performed at CERN’s Large Hadron Collider. In the theory of the strong force within the Standard Model of particle physics - Quantum ChromoDynamics or QCD - confined quarks and gluons from the proton-proton scattering manifest themselves as groups of collimated particles. These particles are clustered into physically measurable objects called hadronic jets. As jets are widely produced at hadron colliders, they are the key physics objects for an early "rediscovery of QCD". This thesis presents the first jet measurement from the ATLAS Collaboration at the LHC and confronts the experimental challenges of precision measurements. Inclusive jet cross section data are then used to improve the knowledge of the momentum distribution of quarks and gluons within the proton and of the magnitude of the strong force.
Download or read book Jet Reconstruction in W Jets Events at the LHC written by Ulrike Schnoor and published by . This book was released on 2010 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Study of Jet and Missing Transverse Energy Performance in Dijet Events with ATLAS Data written by Sushmita Sahu and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Large Hadron Collider(LHC) is the world's largest particle collider at CERN, Geneva, operating at a center of mass energy of 7 TeV . The Toroidal LHC Appa- ratus (ATLAS)is one of two general purpose detectors at the LHC. It is responsible for measuring particles produced in proton-proton collisions and to search for new particles. The High Energy Physics group at UTA has been involved with designing, construc- tion and commissioning of the ATLAS Tile Calorimeter, one of the sub-detectors of ATLAS. One of the components of Tile Cal, the Intermediate Tile Calorimeter (ITC) was constructed at UTA. UTA has been actively involved with the performance and calibration of the ITC. This thesis analyzes jet calibration and performance in the central region of the Calorimeter for di-jet events collected by ATLAS in 2011. The thesis also studies the performance and resolution of missing transverse energy, Emiss T . The performance of the Calorimeter for di erent regions of pseudo-rapidity and for varying transverse momentum have been studied in detail. This dissertation will in addition focus on the performance and calibration of the ITC region.
Download or read book Advances in Jet Substructure at the LHC written by Roman Kogler and published by Springer Nature. This book was released on 2021-05-10 with total page 287 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces the reader to the field of jet substructure, starting from the basic considerations for capturing decays of boosted particles in individual jets, to explaining state-of-the-art techniques. Jet substructure methods have become ubiquitous in data analyses at the LHC, with diverse applications stemming from the abundance of jets in proton-proton collisions, the presence of pileup and multiple interactions, and the need to reconstruct and identify decays of highly-Lorentz boosted particles. The last decade has seen a vast increase in our knowledge of all aspects of the field, with a proliferation of new jet substructure algorithms, calculations and measurements which are presented in this book. Recent developments and algorithms are described and put into the larger experimental context. Their usefulness and application are shown in many demonstrative examples and the phenomenological and experimental effects influencing their performance are discussed. A comprehensive overview is given of measurements and searches for new phenomena performed by the ATLAS and CMS Collaborations. This book shows the impressive versatility of jet substructure methods at the LHC.
Download or read book Jet Quenching in Relativistic Heavy Ion Collisions at the LHC written by Aaron Angerami and published by Springer Science & Business Media. This book was released on 2013-12-02 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents the first measurements of jets in relativistic heavy ion collisions as reported by the ATLAS Collaboration. These include the first direct observation of jet quenching through the observation of a centrality-dependent dijet asymmetry. Also, a series of jet suppression measurements are presented, which provide quantitative constraints on theoretical models of jet quenching. These results follow a detailed introduction to heavy ion physics with emphasis on the phenomenon of jet quenching and a comprehensive description of the ATLAS detector and its capabilities with regard to performing these measurements.
Download or read book High Jet Multiplicity Physics at the LHC written by Mireia Crispín Ortuzar and published by Springer. This book was released on 2016-08-25 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes research in two different areas of state-of-the-art hadron collider physics, both of which are of central importance in the field of particle physics. The first part of the book focuses on the search for supersymmetric particles called gluinos. The book subsequently presents a set of precision measurements of “multi-jet” collision events, which involve large numbers of newly created particles, and are among the dominant processes at the Large Hadron Collider (LHC). Now that a Higgs boson has been discovered at the LHC, the existence (or non-existence) of supersymmetric particles is of the utmost interest and significance, both theoretically and experimentally. In addition, multi-jet collision events are an important background process for a wide range of analyses, including searches for supersymmetry.
Download or read book Inclusive b Jet Production in Proton Proton Collisions written by Patrick L.S. Connor and published by Springer Nature. This book was released on 2019-11-29 with total page 325 pages. Available in PDF, EPUB and Kindle. Book excerpt: ^ 74 GeV and |y| 2.4; the b jets must contain a B hadron. The measurement has significant statistics up to p T ∼ O(TeV). Advanced methods of unfolding are performed to extract the signal. It is found that fixed-order calculations with underlying event describe the measurement well.
Download or read book In situ Measurement of the Jet Energy Scale and Studies of Jet Structure at ATLAS written by Arthur James Horton and published by . This book was released on 2017 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents results for the determination of the ATLAS jet energy scale (JES) using the Missing $E_{\mathrm T}$ Projecting Fraction (MPF) method along with studies to better understand and validate the MPF. Hadronic jets are the most commonly observed objects in proton-proton collisions, and are therefore a part of most final states for processes which are studied at the Large Hadron Collider (LHC). The abundance of jets makes a precise knowledge of the JES essential to the success of the ATLAS physics program. This thesis uses the MPF in events where either a photon or a Z boson is produced back-to-back with a jet to provide an uncertainty on the response of the calorimeter which is below 1\% for jets between 30 GeV and 1 TeV. Studies measuring the impact of the underlying event on the MPF's ability to measure the response of the hadronic recoil are also presented, which validate the previously held assumption that the MPF is insensitive to these effects. In addition, studies into the relation between the measured recoil response and the desired jet response are presented. This includes measures of the flow of energy across the jet boundary during the showering process and the effect on the total measured response of low energy/low response particles near the fringe of the recoil. These measurements show up to a 10% difference between the jet response and the recoil response for jets reconstructed with the anti-k_t algorithm with midrange size parameters (0.4-0.7). These differences however show little dependence on physics modeling choices (less than 1%), on which the Monte Carlo jet calibration is based. These results put the MPF technique on a firmer ground, and they will reduce future JES uncertainties for jets with energies below 100 GeV.
Download or read book Determining the Jet Energy Scale and Resolution of the Forward Calorimeters in the ATLAS Experiment at the Large Hadron Collider written by Wesley Ernst and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "The jet energy scale and resolution of the forward calorimeters of the ATLAS detector are two important measurements for physics analyses dependent on missing transverse energy measurements and jet tagging efficiencies. This thesis investigates the validity of the current calibration or jet energy scale of the ATLAS forward calorimeters in the pseudorapidity region of 3.6
Download or read book Mapping the Redistribution of Jet Energy in PbPb Collisions at the LHC with CMS written by Christopher Francis McGinn and published by . This book was released on 2019 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quenched jets produced in heavy ion collisions at the LHC and reconstructed with the CMS detector are studied to understand the nature of interactions between hardscattered partons and the simultaneously produced hot and dense medium, the Quark- Gluon Plasma (QGP). Jets are objects with color charge evolving through many energy scales, so are an excellent tool for scattering experiment in QGP, with potential to resolve quasiparticle structure and induce medium response. Redistribution of jet energy is quantified in two methods: measurement of transverse PT of final state particles projected onto dijet azimuthal axis, and measurement of jet production cross sections in PbPb and pp as function of jet radius. Missing momentum shows recovery of lost energy when moving beyond the jet cone for a fixed collection of jets, approaching full recovery at ... A jet radius scan of jet production cross sections shows consistent observed suppression in PbPb when compared to appropriately scaled pp at all radii. However, less suppression is observed with increasing jet resolution parameter R. In combination the results imply that while jet energy lost to medium interactions can be found when looking beyond the jet cone, the substantial changes to the jet population in pp at each studied R lead to sustained spectral suppression with even the largest cone size.
Download or read book Jet Energy Calibration in ATLAS written by Douglas William Schouten and published by . This book was released on 2007 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: A correct energy calibration for jets is essential to the success of the ATLAS experiment. In this thesis I study a method for deriving an in situ jet energy calibration for the ATLAS detector. In particular, I show the applicability of the missing transverse energy projection fraction method. This method is shown to set the correct mean energy for jets. Pileup effects due to the high luminosities at ATLAS are also studied. I study the correlations in lateral distributions of pileup energy, as well as the luminosity dependance of the in situ calibration method.
Download or read book In Situ Light Jet Energy Calibration Using Semileptonic Top Quark Decay with the ATLAS Experiment written by Hossain Ahmed and published by . This book was released on 2009 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physics with Photons Using the ATLAS Run 2 Data written by Stefano Manzoni and published by Springer. This book was released on 2019-08-02 with total page 265 pages. Available in PDF, EPUB and Kindle. Book excerpt: The work presented in this book is based on the proton-proton collision data from the Large Hadron Collider at a centre-of-mass energy of 13 TeV recorded by the ATLAS detector in 2015 and 2016. The research program of the ATLAS experiment includes the precise measurement of the parameters of the Standard Model, and the search for signals of physics beyond the SM. Both these approaches are pursued in this thesis, which presents two different analyses: the measurement of the Higgs boson mass in the di-photon decay channel, and the search for production of supersymmetric particles (gluinos, squarks or winos) in a final state containing two photons and missing transverse momentum. Finally, ATLAS detector performance studies, which are key ingredients for the two analyses outlined before, are also carried out and described.
Download or read book Jet Energy Calibration and a Search for Supersymmetry with Vector Boson Fusion Channel Like Sign Di h di tau H Final States written by Denis Rathjens and published by . This book was released on 2015 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:
