Search For Particles Decaying To Tt Pairs Through The Di Lepton Decay Mode Using The Atlas Detector At Cern
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Search For Particles Decaying To Tt Pairs Through The Di Lepton Decay Mode Using The Atlas Detector At Cern
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Author : Robin Eamonn Long
language : en
Publisher:
Release Date : 2012
Search For Particles Decaying To Tt Pairs Through The Di Lepton Decay Mode Using The Atlas Detector At Cern written by Robin Eamonn Long 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.
Quest For The Origin Of Particles And The Universe Proceedings Of The Kmi Inauguration Conference
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Author : Yasumichi Aoki
language : en
Publisher: World Scientific
Release Date : 2013-03-25
Quest For The Origin Of Particles And The Universe Proceedings Of The Kmi Inauguration Conference written by Yasumichi Aoki and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-03-25 with Science categories.
The Kobayashi-Maskawa Institute for the Origin of Particles and the Universe (KMI) was founded at Nagoya University in 2010 under the directorship of T Maskawa, in celebration of the 2008 Nobel Prize in Physics for M Kobayashi and T Maskawa, both who are alumni of Nagoya University. In commemoration of the new KMI building in 2011, the KMI Inauguration Conference (KMIIN) was organized to discuss perspectives of various fields — both theoretical and experimental studies of particle physics and astrophysics — as the main objectives of the KMI activity.This proceedings contains a welcome address by T Maskawa conveying his hopes for KMI to create new revolutionary directions in the spirit of Shoichi Sakata, a great mentor of both Maskawa and Kobayashi. Invited speakers, world-leading scientists in the fields, and the young scientists at KMI contributed to this volume containing theoretical studies of strongly coupled gauge theories in view of LHC phenomenology, string theory approach and lattice studies as well as hot/dense QCD system, and also super-symmetric GUT models, etc., together with experimental studies of LHC physics, B physics, neutrino physics and the related astrophysics and cosmology. The volume yields a unique synergy of particle physics and astrophysics, closely related to the main activity of KMI encompassing particle theory (including lattice computer simulations), particle physics experiments, cosmology, and astrophysics observations.
Heavy Neutral Particle Decays To Tau Pairs
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Author : Michail Bachtis
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-12-13
Heavy Neutral Particle Decays To Tau Pairs written by Michail Bachtis and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-12-13 with Science categories.
The work presented in this thesis spans a wide range of experimental particle physics subjects, starting from level-1 trigger electronics to the final results of the search for Higgs boson decay and to tau lepton pairs. The thesis describes an innovative reconstruction algorithm for tau decays and details how it was instrumental in providing a measurement of Z decay to tau lepton pairs. The reliability of the analysis is fully established by this measurement before the Higgs boson decay to tau lepton pairs is considered. The work described here continues to serve as a model for analysing CMS Higgs to tau leptons measurements.
Search For Lepton Flavor Vviolation In Z Boson Decays With Tau Leptons With The Atlas Detector
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Author : ATLAS Collaboration CERN
language : en
Publisher:
Release Date : 2021
Search For Lepton Flavor Vviolation In Z Boson Decays With Tau Leptons With The Atlas Detector 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 2021 with categories.
A Search For Tt Resonances In The Single Lepton Final State With The Atlas Experiment
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Author : Andrew David Altheimer
language : en
Publisher:
Release Date : 2014
A Search For Tt Resonances In The Single Lepton Final State With The Atlas Experiment written by Andrew David Altheimer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
A search for undiscovered particles decaying into top-antitop quark pairs produced in proton-proton collisions with the ATLAS experiment at the Large Hadron Collider utilizing 20.3 fb$^-1$ of data collected at $\sqrt{s}=8$ \tev\ center-of-mass energy during the 2012 data taking period is presented. The invariant mass spectrum of events containing multiple jets, exactly one lepton, and missing transverse energy and which are consistent with the decay of a top-antitop quark pair is studied and found to be consistent with that predicted by the Standard Model. Upper limits on the production cross section times branching ratio of several benchmark signal models are set at a 95\% confidence level.
Search For Long Lived Particles Decaying To Oppositely Charged Lepton Pairs With The Atlas Experiment At S
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Author : Dominik Krauss
language : en
Publisher:
Release Date : 2019
Search For Long Lived Particles Decaying To Oppositely Charged Lepton Pairs With The Atlas Experiment At S written by Dominik Krauss 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.
Search For Charged Lepton Flavour Violation In Z Boson Decays With The Atlas Detector
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Author : ATLAS Collaboration CERN
language : en
Publisher:
Release Date : 2021
Search For Charged Lepton Flavour Violation In Z Boson Decays With The Atlas Detector 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 2021 with categories.
Search For Events With Two Displaced Vertices From Pair Produced Neutral Long Lived Particles Decaying To Hadronic Jets In The Muon Spectrometer Of The Atlas Detector With Full Run 2 Data
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Author : Audrey Kvam
language : en
Publisher:
Release Date : 2022
Search For Events With Two Displaced Vertices From Pair Produced Neutral Long Lived Particles Decaying To Hadronic Jets In The Muon Spectrometer Of The Atlas Detector With Full Run 2 Data written by Audrey Kvam and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
This analysis is a search for events with two displaced vertices reconstructed from the decay of pair-produced neutral, weakly-interacting, long-lived particles using the muon spectrometer of the ATLAS detector. The search uses a model-independent strategy, and employs a custom trigger for reconstructing displaced hadronic jets in the muon spectrometer with 139 fb-1 of pp collision data at [square root of]s=13 TeV collected in Run 2 at the LHC. The results are interpreted in terms of a Higgs scalar portal model, which probes the existence of a hidden sector that weakly couples to the Standard Model. The search observed 0 events in the signal region, which is compatible with the expected background of 0.32 ± 0.05 events. Limits were set on long-lived particle lifetime for all simulated signal mass points. For the Higgs boson with a mass of 125 GeV, the analysis reports the first exclusion limits for branching fractions into neutral long-lived particles below 0.1%, while branching fractions above 10% are excluded at 95% confidence level for long-lived particle proper lifetimes ranging from 4 cm to 72.4 m. In addition, the analysis presents the first results for the decay of long-lived particles into tt ̅ in the ATLAS muon spectrometer.
Heavy Neutral Particle Decays To Tau Pairs In Proton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2012
Heavy Neutral Particle Decays To Tau Pairs In Proton 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 2012 with categories.
This thesis describes a study of the tau-pair final state in proton collisions at a center of mass energy of 7 TeV using the CMS Experiment at the CERN Large Hadron Collider. Tau leptons usually decay to hadrons and their efficient detection is very challenging in a hadronic environment. A novel tau reconstruction algorithm that maintains tau detection efficiency for low background rates was developed. Events were then selected from the CMS 2011 data sample in three T T final states depending on the tau decays: mu + T (h), e+ T (h), e+mu where T (h) denotes a hadronic tau decay. Those events were used to measure the Z-boson production cross section where Z yields T T . A search for the Standard Model and Minimal Supersymmetric Standard Model (MSSM) Higgs bosons was also performed. No signal was observed in the Higgs search and stringent new bounds were set for the SM Higgs production and in the MSSM parameter space.
Search For Displaced Leptons In Proton Proton Collisions At Sqare Root S
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Author : Bryan Cardwell
language : en
Publisher:
Release Date : 2021
Search For Displaced Leptons In Proton Proton Collisions At Sqare Root S written by Bryan Cardwell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with Leptons (Nuclear physics) categories.
A search is presented for new long-lived particles that propagate a measurable distance through the CMS detector before decaying to leptons. The search is performed in 113–118 fb-1 of proton-proton collision data produced by the CERN LHC at a center-of-mass energy of 13 TeV and collected by the CMS detector in 2016, 2017, and 2018. Events are selected with two leptons (an electron and a muon, two electrons, or two muons) that both have transverse impact parameter values between 0.01 and 10 cm. Using transverse impact parameter as the discriminating variable allows for sensitivity to displaced decays without requiring that the leptons form a common vertex. The search is designed to be sensitive to a wide range of new physics models that produce displaced di-lepton final states. The observation is consistent with the background-only hypothesis, and limits are set on the product of the cross-section of top squark pair production and the branching fraction to a lepton and a b or d quark through an R-parity-violating vertex. For a proper decay length hypothesis of 2 cm, top squarks with masses up 1500 GeV are excluded at the 95% confidence level.