Search For Displaced Leptons In Proton Proton Collisions At Sqare Root S

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A Search For Displaced Leptons In The Atlas Detector
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Author : Lesya Horyn
language : en
Publisher: Springer Nature
Release Date : 2022-02-07
A Search For Displaced Leptons In The Atlas Detector written by Lesya Horyn and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-02-07 with Science categories.
This thesis presents a search for long-lived particles decaying into displaced electrons and/or muons with large impact parameters. This signature provides unique sensitivity to the production of theoretical lepton-partners, sleptons. These particles are a feature of supersymmetric theories, which seek to address unanswered questions in nature. The signature searched for in this thesis is difficult to identify, and in fact, this is the first time it has been probed at the Large Hadron Collider (LHC). It covers a long-standing gap in coverage of possible new physics signatures. This thesis describes the special reconstruction and identification algorithms used to select leptons with large impact parameters and the details of the background estimation. The results are consistent with background, so limits on slepton masses and lifetimes in this model are calculated at 95% CL, drastically improving on the previous best limits from the Large Electron Positron Collider (LEP).
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.
A Measurement Of The Production Cross Section Of Tt Pairs In Proton Antiproton Collisions At Square Root S
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Author : Henri Bachacou
language : en
Publisher:
Release Date : 2004
A Measurement Of The Production Cross Section Of Tt Pairs In Proton Antiproton Collisions At Square Root S written by Henri Bachacou and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
Search For New Physics Processes With Same Charge Leptons In The Final State With The Atlas Detector Using Proton Proton Collisions At Square Root S
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Author : Miha Muškinja
language : en
Publisher:
Release Date : 2018
Search For New Physics Processes With Same Charge Leptons In The Final State With The Atlas Detector Using Proton Proton Collisions At Square Root S written by Miha Muškinja and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
A Search For New Physics In Photon Lepton Events In Proton Antiproton Collisions At Square Root S
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Author : Jeffrey W. Berryhill
language : en
Publisher:
Release Date : 2000
A Search For New Physics In Photon Lepton Events In Proton Antiproton Collisions At Square Root S written by Jeffrey W. Berryhill and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Collisions (Nuclear physics) categories.
Search For Type Iii Seesaw Heavy Leptons In Leptonic Final States 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 Type Iii Seesaw Heavy Leptons In Leptonic Final States 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 the pair production of heavy leptons as predicted by the type-III seesaw mechanism is presented. The search uses proton-proton collision data at a centre-of-mass energy of 13 TeV, corresponding to 139fb−1 of integrated luminosity recorded by the ATLAS detector during Run 2 of the Large Hadron Collider. The analysis focuses on final states with three or four electrons or muons from the possible decays of new heavy leptons via intermediate electroweak bosons. No significant deviations above the Standard Model expectation are observed; upper and lower limits on the heavy lepton production cross-section and masses are derived respectively. These results are then combined for the first time with the ones already published by ATLAS using the channel with two leptons in the final state. The observed lower limit on the mass of the type-III seesaw heavy leptons combining two, three and four lepton channels together is 910 GeV at the 95% confidence level
Search For Neutral Long Lived Particles 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 Neutral Long Lived Particles 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 decays of pair-produced neutral long-lived particles (LLPs) is presented using 139 fb−1 of proton-proton collision data collected by the ATLAS detector at the LHC in 2015-2018 at a centre-of-mass energy of 13 TeV. Dedicated techniques were developed for the reconstruction of displaced jets produced by LLPs decaying hadronically in the ATLAS hadronic calorimeter. Two search regions are defined for different LLP kinematic regimes. The observed numbers of events are consistent with the expected background, and limits for several benchmark signals are determined. For a SM Higgs boson with a mass of 125 GeV, branching ratios above 10% are excluded at 95% confidence level for values of c times LLP mean proper lifetime in the range between 20 mm and 10 m depending on the model. Upper limits are also set on the cross-section times branching ratio for scalars with a mass of 60 GeV and for masses between 200 GeV and 1 TeV
Search For Weakly Interacting Long Lived Particles In Proton Proton Collisions At Square Root Of S
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Author : Orin Michael Harris
language : en
Publisher:
Release Date : 2013
Search For Weakly Interacting Long Lived Particles In Proton Proton Collisions At Square Root Of S written by Orin Michael Harris and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Higgs bosons categories.
A search for the decay of a light Higgs boson to a pair of weakly-interacting, long-lived particles in 20.8 fb-1 of proton-proton collisions at [square root of] s = 8 TeV recorded in 2012 by the ATLAS detector is presented. The strategy requires that both of the long-lived particles decay just before or inside the hadronic calorimeter. No statistically significant excess of events is observed above the expected background and limits on the Higgs boson production and branching ratio to weakly-interacting, long-lived particles are derived as a function of the particle's proper decay length.
Search For Pair Production Of First Generation Scalar Leptoquarks In Proton Proton Collisions At Complex Square Root Of
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Author : Dinko Ferencek
language : en
Publisher:
Release Date : 2011
Search For Pair Production Of First Generation Scalar Leptoquarks In Proton Proton Collisions At Complex Square Root Of written by Dinko Ferencek 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.
A Search For An Unexpected Asymmetry In The Production Of E Plus My Minus And E Minus My Plus Pairs In Proton Proton Collisions Recorded By The Atlas Detector At Square Root S
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Author : [Study Group] ATLAS Collaboration CERN
language : en
Publisher:
Release Date : 2022
A Search For An Unexpected Asymmetry In The Production Of E Plus My Minus And E Minus My Plus Pairs In Proton Proton Collisions Recorded By The Atlas Detector 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: This search, a type not previously performed at ATLAS, uses a comparison of the production cross sections for and pairs to constrain physics processes beyond the Standard Model. It uses of proton-proton collision data recorded at TeV at the LHC. Targeting sources of new physics which prefer final states containing to , the search contains two broad signal regions which are used to provide model-independent constraints on the ratio of cross sections at the 2% level. The search also has two special selections targeting supersymmetric models and leptoquark signatures. Observations using one of these selections are able to exclude, at 95% confidence level, singly produced smuons with masses up to 640 GeV in a model in which the only other light sparticle is a neutralino when the R-parity-violating coupling is close to unity. Observations using the other selection exclude scalar leptoquarks with masses below 1880 GeV when , at 95% confidence level. The limit on the coupling reduces to for a mass of 1420 GeV