Underlying Event Studies At Atlas And Cdf

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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.

Measurements Of The Charged Underlying Event With The Atlas Detector At 7tev 900 Gev Center Of Mass Energies

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Author : Gabriel Archacki Hare
language : en
Publisher:
Release Date : 2011

Measurements Of The Charged Underlying Event With The Atlas Detector At 7tev 900 Gev Center Of Mass Energies written by Gabriel Archacki Hare 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.

Multiple Parton Interactions At The Lhc

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Author : Paolo Bartalini
language : en
Publisher: World Scientific Publishing
Release Date : 2018-11-02

Multiple Parton Interactions At The Lhc written by Paolo Bartalini and has been published by World Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-11-02 with Science categories.

Many high-energy collider experiments (including the current Large Hadron Collider at CERN) involve the collision of hadrons. Hadrons are composite particles consisting of partons (quarks and gluons), and this means that in any hadron-hadron collision there will typically be multiple collisions of the constituents — i.e. multiple parton interactions (MPI). Understanding the nature of the MPI is important in terms of searching for new physics in the products of the scatters, and also in its own right to gain a greater understanding of hadron structure. This book aims at providing a pedagogical introduction and a comprehensive review of different research lines linked by an involvement of MPI phenomena. It is written by pioneers as well as young leading scientists, and reviews both experimental findings and theoretical developments, discussing also the remaining open issues.

High Energy Physics

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Author :
language : en
Publisher: World Scientific
Release Date : 1981

High Energy Physics written by and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with categories.

Iii Italian Workshop On Atlas And Cms Physics

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Author : Lucia Sivestris
language : en
Publisher: SIF Edizioni Scientifiche
Release Date : 2006

Iii Italian Workshop On Atlas And Cms Physics written by Lucia Sivestris and has been published by SIF Edizioni Scientifiche this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Science categories.

Study Of Double Parton Scattering Using Four Jet Scenarios

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Author : Paolo Gunnellini
language : en
Publisher: Springer
Release Date : 2015-08-24

Study Of Double Parton Scattering Using Four Jet Scenarios written by Paolo Gunnellini and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-08-24 with Science categories.

This thesis addresses in a very new and elegant way several measurements and the extraction of so-called double parton scattering. The new and elegant way lies in the combination of measurements and a very smart extraction of double parton scattering results, which is easy to apply and overcomes many of the technical difficulties of older methods. Many new phenomena in particle physics can be observed when particles are collided at the highest energies; one of the highlights in recent years was the discovery of the Higgs boson at the Large Hadron Collider at CERN. Understanding the production mechanism of the Higgs boson at the LHC requires detailed knowledge of the physics of proton-proton collisions. When the density of partons in the protons becomes large, there is a non-negligible probability that more than one parton participates in the interaction and the so-called double parton scattering becomes important. In some cases very particular final state signatures can be observed, which can be regarded as an indication of such double partonic scattering and where the different interactions can be separated. Such multiple partonic interactions play an important role when precise predictions from known processes are required.

High Jet Multiplicity Physics At The Lhc

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Author : Mireia Crispín Ortuzar
language : en
Publisher: Springer
Release Date : 2016-08-25

High Jet Multiplicity Physics At The Lhc written by Mireia Crispín Ortuzar and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-08-25 with Science categories.

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.

Hera And The Lhc

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Author : Albert De Roeck
language : en
Publisher:
Release Date : 2005

Hera And The Lhc written by Albert De Roeck and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Diffraction categories.

Jet Physics At The Lhc

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Author : Klaus Rabbertz
language : en
Publisher: Springer
Release Date : 2016-10-11

Jet Physics At The Lhc written by Klaus Rabbertz and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-10-11 with Science categories.

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.

Cern

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Author :
language : en
Publisher:
Release Date : 2005

Cern written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Nuclear physics categories.