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A Cone Jet-Finding Algorithm for Heavy-Ion Collisions at LHCEnergies

A Cone Jet-Finding Algorithm for Heavy-Ion Collisions at LHCEnergies
Author:
Publisher:
Total Pages:
Release: 2006
Genre:
ISBN:

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Standard jet finding techniques used in elementary particle collisions have not been successful in the high track density of heavy-ion collisions. This paper describes a modified cone-type jet finding algorithm developed for the complex environment of heavy-ion collisions. The primary modification to the algorithm is the evaluation and subtraction of the large background energy, arising from uncorrelated soft hadrons, in each collision. A detailed analysis of the background energy and its event-by-event fluctuations has been performed on simulated data, and a method developed to estimate the background energy inside the jet cone from the measured energy outside the cone on an event-by-event basis. The algorithm has been tested using Monte-Carlo simulations of Pb+Pb collisions at (square root)s = 5.5 TeV for the ALICE detector at the LHC. The algorithm can reconstruct jets with a transverse energy of 50 GeV and above with an energy resolution of (almost equal to) 30%.


A Cone Jet-Finding Algorithm for Heavy Ion Collisions at LHC Energies

A Cone Jet-Finding Algorithm for Heavy Ion Collisions at LHC Energies
Author:
Publisher:
Total Pages: 15
Release: 2006
Genre:
ISBN:

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Standard jet finding techniques used in elementary particle collisions have not been successful in the high track density of heavy-ion collisions. This paper describes a modified cone-type jet finding algorithm developed for the complex environment of heavy-ion collisions. The primary modification to the algorithm is the evaluation and subtraction of the large background energy, arising from uncorrelated soft hadrons, in each collision. A detailed analysis of the background energy and its event-by-event fluctuations has been performed on simulated data, and a method developed to estimate the background energy inside the jet cone from the measured energy outside the cone on an event-by-event basis. The algorithm has been tested using Monte-Carlo simulations of Pb+Pb collisions at (square root)s = 5.5 TeV for the ALICE detector at the LHC. The algorithm can reconstruct jets with a transverse energy of 50 GeV and above with an energy resolution of (almost equal to) 30%.


Jet Quenching in Relativistic Heavy Ion Collisions at the LHC

Jet Quenching in Relativistic Heavy Ion Collisions at the LHC
Author: Aaron Angerami
Publisher: Springer Science & Business Media
Total Pages: 180
Release: 2013-12-02
Genre: Science
ISBN: 3319012193

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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.


Jet Quenching in Heavy-ion Collisions at LHC with CMS Detector

Jet Quenching in Heavy-ion Collisions at LHC with CMS Detector
Author: Yetkin Yilmaz
Publisher:
Total Pages: 148
Release: 2013
Genre:
ISBN:

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The collision of highly relativistic nuclei can produce a volume of high energy density which can be used to learn about the behavior of quantum chromodynamics (QCD) at extreme conditions, such as those of the universe at times before and during the formation of hadrons out of quarks and gluons. This thesis presents experimental studies of jet-quenching phenomena in PbPb collisions at [square root of]sNN = 2.76 TeV, with a focus on the study of the energy-loss, namely the analysis of correlations of jet pairs as measured by the CMS detector at LHC. The implications of the results are discussed by comparison of simple models with data. It is observed that the geometrical configuration of the dijets and the nuclear collision region plays an important role in the correlations between the jets, and the set of CMS results reviewed can illustrate the dependence of the amount of lost energy on the length of the traversed medium.


Advances in Jet Substructure at the LHC

Advances in Jet Substructure at the LHC
Author: Roman Kogler
Publisher: Springer Nature
Total Pages: 287
Release: 2021-05-10
Genre: Science
ISBN: 3030728587

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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.


Characterization of Jets in Heavy Ion Collisions Using Photons at the LHC with the CMS Detector

Characterization of Jets in Heavy Ion Collisions Using Photons at the LHC with the CMS Detector
Author: Richard Alexander Barbieri
Publisher:
Total Pages: 138
Release: 2017
Genre:
ISBN:

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Using the CMS detector at the LHC, a quantitative study of jet energy loss and angular deflection inside the high energy-density medium formed in PbPb collisions is made. Photons are used to measure the initial state of a color-charged probe while jet reconstruction is used to measure the final state. Significant loss of energy to the medium as a function of initial parton momentum is observed, while no significant angular deflection is found.


Heavy Flavor Jet Quenching in Relativistic Heavy Ion Collisions at the LHC

Heavy Flavor Jet Quenching in Relativistic Heavy Ion Collisions at the LHC
Author: Tingting Wang
Publisher:
Total Pages:
Release: 2017
Genre:
ISBN:

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Muons originating from background sources, primarily Charm hadrons, pion and kaon decays, have been removed from the analysis using template fits to the distribution of a quantity(p T^rel) capable of statistically distinguishing between signal and background. The measured nuclear modification factor R AA has been presented in different centrality bins as a function of the b-jet transverse momentum p T.The results of R AA indicate that the yield of the most central event (0-10%) experiences more suppression compared to the most peripheral event (60-80%) by a factor of approximate 2.