Search For Long Lived Supersymmetric Particles Using Displaced Vertices With The Atlas Detector At The Lhc
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Search For Long Lived Supersymmetric Particles Using Displaced Vertices With The Atlas Detector At The Lhc
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Author : Emily Anne Thompson
language : en
Publisher:
Release Date : 2022
Search For Long Lived Supersymmetric Particles Using Displaced Vertices With The Atlas Detector At The Lhc written by Emily Anne Thompson 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.
Abstract: The existence of long-lived particles (LLPs) is a common feature in many theories beyond the Standard Model. For example, models with small couplings (i.e. R-parity-violating supersymmetry) and models allowing for decays via highly virtual intermediate states (i.e. Split supersymmetry) predict the presence of LLPs. With lifetimes ranging from picoseconds to nanoseconds, massive LLPs could decay to several electrically charged particles in the inner tracking volume of the ATLAS detector at the Large Hadron Collider, resulting in the reconstruction of a displaced secondary vertex. This thesis presents the first search for high mass, multi-track displaced vertices and multiple energetic jets using the full Run-2 dataset collected by the ATLAS detector, corresponding to an integrated luminosity of 139 fb−1 at s√=13 TeV. The observed event yields are compatible with those expected from background processes. The results are presented as exclusion limits at 95 % confidence level on supersymmetric scenarios with non-zero R-parity violating couplings. This thesis also presents the ATLAS FastTracKer (FTK), which is a hardware-based track finder envisioned to be integrated into the ATLAS trigger system. The trigger system is responsible for selecting interesting events with a high purity at a rate of only 1 kHz. The FTK was designed to provide tracking information of all charged particles with pT>1 GeV in the ATLAS inner detector, which is a powerful discriminant for selecting interesting events. The training of the FTK system to achieve a high track-finding efficiency and the adaptability of the system to new detector conditions is presented. Furthermore, the applicability of the system to select candidate events containing long-lived particles is described
Phenomena Beyond The Standard Model What Do We Expect For New Physics To Look Like
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Author : Roman Pasechnik
language : en
Publisher: Frontiers Media SA
Release Date : 2020-09-03
Phenomena Beyond The Standard Model What Do We Expect For New Physics To Look Like written by Roman Pasechnik and has been published by Frontiers Media SA this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-09-03 with Science categories.
This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact.
Future Of The Large Hadron Collider The A Super Accelerator With Multiple Possible Lives
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Author : Oliver Bruning
language : en
Publisher: World Scientific
Release Date : 2023-08-08
Future Of The Large Hadron Collider The A Super Accelerator With Multiple Possible Lives written by Oliver Bruning and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-08-08 with Science categories.
The Large Hadron Collider (LHC) is the highest energy collider ever built. It resides near Geneva in a tunnel 3.8m wide, with a circumference of 26.7km, which was excavated in 1983-1988 to initially house the electron-positron collider LEP. The LHC was approved in 1995, and it took until 2010 for reliable operation. By now, a larger set of larger integrated luminosities have been accumulated for physics analyses in the four collider experiments: ATLAS, CMS, LHCb and ALICE.The LHC operates with an extended cryogenic plant, using a multi-stage injection system comprising the PS and SPS accelerators (still in use for particle physics experiments at lower energies). The beams are guided by 1232 superconducting high field dipole magnets.Intense works are underway in preparation of the High Luminosity LHC, aimed at upgrading the LHC and detectors for collecting ten times more luminosity, and extending the collider life to the early 2040's. So far, the (HL-)LHC project represents a cumulation of around one hundred thousand person-years of innovative work by technicians, engineers, and physicists from all over the world; probably the largest scientific effort ever in the history of humanity. The book is driven by the realisation of the unique value of this accelerator complex and by the recognition of the status of high energy physics, described by a Standard Model — which still leaves too many questions unanswered to be the appropriate theory of elementary particles and their interactions.Following the Introduction are: three chapters which focus on the initial decade of operation, leading to the celebrated discovery of the Higgs Boson, on the techniques and physics of the luminosity upgrade, and finally on major options - of using the LHC in a concurrent, power economic, electron-hadron scattering mode, when upgraded to higher energies or eventually as an injector for the next big machine. The various technical and physics chapters, provided by 61 authors, characterise the fascinating opportunities the LHC offers for the next two decades ahead (possibly longer), with the goal to substantially advance our understanding of nature.
Particle Physics At The Silver Jubilee Of Lomonosov Conferences Proceedings Of The Eighteenth Lomonosov Conference On Elementary Particle Physics
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Author : Alexander I Studenikin
language : en
Publisher: World Scientific
Release Date : 2019-05-28
Particle Physics At The Silver Jubilee Of Lomonosov Conferences Proceedings Of The Eighteenth Lomonosov Conference On Elementary Particle Physics written by Alexander I Studenikin and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-05-28 with Science categories.
The volume of these proceedings is devoted to a wide variety of items, both in theory and experiment, of particle physics such as neutrino and astroparticle physics, tests of standard model and beyond, hadron physics, gravitation and cosmology, physics at the present and future accelerators.
Novel Ideas For Accelerators Particle Detection And Data Challenges At Future Colliders
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Author : Alessandro Tricoli
language : en
Publisher: Frontiers Media SA
Release Date : 2023-07-21
Novel Ideas For Accelerators Particle Detection And Data Challenges At Future Colliders written by Alessandro Tricoli and has been published by Frontiers Media SA this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-07-21 with Science categories.
Search For Long Lived Weakly Interacting Particles That Decay To Displaced Hadronic Jets In Proton Proton Collisions At Arrow
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Author :
language : en
Publisher:
Release Date : 2015
Search For Long Lived Weakly Interacting Particles That Decay To Displaced Hadronic Jets In Proton Proton Collisions At Arrow written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
A search for the decay of neutral, weakly interacting, long-lived particles using data collected by the ATLAS detector at the LHC is presented. This analysis uses the full data set recorded in 2012: 20.3 fb-1 of proton-proton collision data at [arrow]" = 8 TeV. The search employs techniques for reconstructing decay vertices of long-lived particles decaying to jets in the inner tracking detector and muon spectrometer. Signal events require at least two reconstructed vertices. No significant excess of events over the expected background is found, and limits as a function of proper lifetime are reported for the decay of the Higgs boson and other scalar bosons to long-lived particles and for Hidden Valley Z' and Stealth SUSY benchmark models. The first search results for displaced decays in Z' and Stealth SUSY models are presented. The upper bounds of the excluded proper lifetimes are the most stringent to date.
Search For Events With A Pair Of Displaced Vertices From Long Lived Neutral Particles Decaying Into Hadronic Jets In The Atlas Muon Spectrometer In Pp Collisions At Square Root S
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Author : [Study Group] ATLAS Collaboration CERN
language : en
Publisher:
Release Date : 2022
Search For Events With A Pair Of Displaced Vertices From Long Lived Neutral Particles Decaying Into Hadronic Jets In The Atlas Muon Spectrometer In Pp Collisions At Square Root S written by [Study Group] 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 2022 with categories.
Abstract: A search for events with two displaced vertices from long-lived particle (LLP) pairs using data collected by the ATLAS detector at the LHC is presented. This analysis uses 139 fb−1 of proton-proton collision data at √s=13 TeV recorded in 2015-2018. The search employs techniques for reconstructing vertices of LLPs decaying to jets in the muon spectrometer displaced between 3 and 14 m with respect to the primary interaction vertex. The observed numbers of events are consistent with the expected background and limits for several benchmark signals are determined. For the Higgs boson with a mass of 125 GeV, the paper 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 LLP proper lifetimes ranging from 4 cm to 72.4 m. In addition, the paper present the first results for the decay of LLPs into t ̄t in the ATLAS muon spectrometer
Search For Long Lived Weakly Interacting Particles That Decay To Displaced Hadronic Jets In Proton Proton Collisions At U221a S
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Author :
language : en
Publisher:
Release Date : 2015
Search For Long Lived Weakly Interacting Particles That Decay To Displaced Hadronic Jets In Proton Proton Collisions At U221a 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 2015 with categories.
A search for the decay of neutral, weakly interacting, long-lived particles using data collected by the ATLAS detector at the LHC is presented. This analysis uses the full data set recorded in 2012: 20.3 fb–1 of proton-proton collision data at √s = 8 TeV. The search employs techniques for reconstructing decay vertices of long-lived particles decaying to jets in the inner tracking detector and muon spectrometer. Signal events require at least two reconstructed vertices. No significant excess of events over the expected background is found, and limits as a function of proper lifetime are reported for the decay of the Higgs boson and other scalar bosons to long-lived particles and for Hidden Valley Z' and Stealth SUSY benchmark models. The first search results for displaced decays in Z' and Stealth SUSY models are presented. The upper bounds of the excluded proper lifetimes are the most stringent to date.
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.
Displaced Vertices
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Author : Dan Quach
language : en
Publisher:
Release Date : 2020
Displaced Vertices written by Dan Quach and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
We report the results of a search for long-lived particles produced in pairs in proton-proton collisions at the LHC operating at a center-of-mass energy of √s = 13 TeV. The data were collected by the CMS detector during the full Run 2 data taking period from 2015 through 2018, corresponding to a total integrated luminosity of 140/fb. This search targets pair-produced long-lived particles with a mean proper decay length between 0.1 and 100 mm that each decay into at least two quarks. The signature is a pair of displaced vertices each formed from many tracks. This search extends a previous CMS search using the 2015 and 2016 dataset, with improvements in background rejection, background estimation techniques, as well as uncertainty estimation. Results are compared with R-parity violating supersymmetry models that predict pair-produced long-lived particles, each decaying into multijet or dijet final states. No events are observed with two reconstructed high-track-multiplicity vertices. For models of long-lived pair-produced neutralinos, gluinos, and top squarks, pair-production cross sections larger than 0.08 fb at 95% confidence level are excluded for masses between 800 and 3000 GeV and mean proper decay lengths between 1 and 25 mm. In the gluino model, masses up to 2500 GeV are excluded for mean proper decay lengths between 0.6 and 90 mm. In the neutralino model, masses up to 1100 GeV are excluded for mean proper decay lengths between 0.6 and 70 mm. For the top squark model, masses up to 1600 GeV are excluded for mean proper decay lengths between 0.4 and 80 mm.