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Search For Displaced Leptons In Proton Proton Collisions At Sqare Roots
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Book Synopsis 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 by : Miha Muškinja
Download or read book 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 published by . This book was released on 2018 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Displaced Leptons in Proton-proton Collisions at [sqare Root]s by : Bryan Cardwell
Download or read book Search for Displaced Leptons in Proton-proton Collisions at [sqare Root]s written by Bryan Cardwell and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Search for Neutral Long-lived Particles in Pp Collisions at [square Root]s by : [Study Group] ATLAS Collaboration CERN
Download or read book Search for Neutral Long-lived Particles in Pp Collisions at [square Root]s written by [Study Group] ATLAS Collaboration CERN and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Book Synopsis Search for Type-III Seesaw Heavy Leptons in Leptonic Final States in Pp Collisions at [square Root]s by : [Study Group] ATLAS Collaboration CERN
Download or read book 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 published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Book Synopsis Search for New Phenomena in Three- Or Four-lepton Events in Pp Collisions at [square Root]s by : [Study Group] ATLAS Collaboration CERN
Download or read book Search for New Phenomena in Three- Or Four-lepton Events in Pp Collisions at [square Root]s written by [Study Group] ATLAS Collaboration CERN and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: A search with minimal model dependence for physics beyond the Standard Model in events featuring three or four charged leptons (3l and 4l, ) is presented. The analysis aims to be sensitive to a wide range of potential new-physics theories simultaneously. This analysis uses data from pp collisions delivered by the Large Hadron Collider at a centre-of-mass energy of TeV and recorded with the ATLAS detector, corresponding to the full Run 2 dataset of 139 fb−1. The 3l and 4l phase space is divided into 22 event categories according to the number of leptons in the event, the missing transverse momentum, the invariant mass of the leptons, and the presence of leptons originating from a Z-boson candidate. These event categories are analysed independently for the presence of deviations from the Standard Model. No statistically significant deviations from the Standard Model predictions are observed. Upper limits for all signal regions are reported in terms of the visible cross-section
Book Synopsis A Search for New Physics in Photon-lepton Events in Proton-antiproton Collisions at [square Root] S by : Jeffrey W. Berryhill
Download or read book A Search for New Physics in Photon-lepton Events in Proton-antiproton Collisions at [square Root] S written by Jeffrey W. Berryhill and published by . This book was released on 2000 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Weakly-interacting Long-lived Particles in Proton-proton Collisions at [square Root Of] S by : Orin Michael Harris
Download or read book Search for Weakly-interacting Long-lived Particles in Proton-proton Collisions at [square Root Of] S written by Orin Michael Harris and published by . This book was released on 2013 with total page 203 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis A Search for Displaced Leptons in the ATLAS Detector by : Lesya Horyn
Download or read book A Search for Displaced Leptons in the ATLAS Detector written by Lesya Horyn and published by Springer Nature. This book was released on 2022-02-07 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).
Book Synopsis Search for Direct Gaugino Production Decaying to Two Leptons and Missing Transverse Momentum at ATLAS with [square Root] (s) by : Brokk Koen Toggerson
Download or read book Search for Direct Gaugino Production Decaying to Two Leptons and Missing Transverse Momentum at ATLAS with [square Root] (s) written by Brokk Koen Toggerson and published by . This book was released on 2012 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for the electroweak production of gauginos decaying into two leptons and missing transverse momentum, E [subscript T] [superscript miss], is presented using pp collisions at [square root] (s) = 7 TeV produced by the LHC and recorded by the ATLAS detector corresponding to an integrated luminosity of 4.7 fb−1. Standard Model backgrounds are estimated using a combination of semi-data-driven techniques where possible, and Monte Carlo simulation. No significant excess in data with respect to the Standard Model prediction is observed in any of the four signal regions: opposite-sign dileptons with a jet veto and E [subscript T] [superscript miss], same-sign dileptons with a jet veto and E [subscript T] [superscript miss], opposite-sign dileptons in association with jets, or a signal region requiring opposite sign dileptons and using kinematic properties of the event to remove tt̄ and WW backgrounds. In addition to model-independent limits, limits are set in both simplified models and in the context of the phenomenological Minimally Supersymmetric Standard Model. Using the simplified model paradigm, wino-based charginos, decaying through an intermediate on-shell slepton or sneutrino to a stable 10 GeV neutralino, are excluded for chargino masses between 110 and 340 GeV. For the case of associatively produced mass-degenerate charginos and neutralinos both decaying via on-shell sleptons or sneutrinos to stable 10 GeV neutralinos, the chargino and neutralino masses of 80-260 GeV are excluded.
Book Synopsis The Search for Di-lepton Signatures from Squarks and Gluinos in Pp ̄collisions at [square Root of S] by : Richard Joyner Genik
Download or read book The Search for Di-lepton Signatures from Squarks and Gluinos in Pp ̄collisions at [square Root of S] written by Richard Joyner Genik and published by . This book was released on 1998 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Search for Generation-1 Leptoquarks in Proton-antiproton Collisions at [square Root]s by : Steven M. Moulding
Download or read book A Search for Generation-1 Leptoquarks in Proton-antiproton Collisions at [square Root]s written by Steven M. Moulding and published by . This book was released on 1993 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Generic Search for New Physics in Same-sign Dilepton Events in [square Root] (s) by : Robert Austin Porter
Download or read book A Generic Search for New Physics in Same-sign Dilepton Events in [square Root] (s) written by Robert Austin Porter and published by . This book was released on 2011 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes a generic search for new physics in events with two leptons having the same electric charge resulting from proton-antiproton collisions at the Fermilab Tevatron. The data set analyzed corresponds to 6/fb of integrated luminosity recorded by the Collider Detector at Fermilab (CDF). A previous analysis of 1/fb−1 of data in the same channel observed a small excess, motivating a reexamination of the channel. A data-driven technique is used for modeling events where one lepton is a misidentified jet, and Monte Carlo simulation is used for the remaining Standard Model background. The data are found to be consistent with the expected background and limits are set on several models predicting events in this channel.
Book Synopsis Search for Production of Hidden Particles in Proton-proton Collisions with the CMS Experiment at the Large Hadron Collider (LHC) Using Displaced Non-prompt Lepton by : Mohamed Darwish
Download or read book Search for Production of Hidden Particles in Proton-proton Collisions with the CMS Experiment at the Large Hadron Collider (LHC) Using Displaced Non-prompt Lepton written by Mohamed Darwish and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Excited Leptons in Proton-proton Collisions at {u221A}(s) by :
Download or read book Search for Excited Leptons in Proton-proton Collisions at {u221A}(s) written by and published by . This book was released on 2016 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: Our search for compositeness of electrons and muons is presented using a data sample of proton-proton collisions at a center-of-mass energy of √(s) = 8 TeV collected with the CMS detector at the LHC and corresponding to an integrated luminosity of 19.7 fb-1. Excited leptons (l*) produced via contact interactions in conjunction with a standard model lepton are considered, and a search is made for their gauge decay modes. The decays considered are l* →l? and l* → lZ, which give final states of two leptons and a photon or, depending on the Z-boson decay mode, four leptons or two leptons and two jets. The number of events observed in data is consistent with the standard model prediction. Exclusion limits are set on the excited lepton mass, and the compositeness scale L. For the case Ml* = L the existence of excited electrons (muons) is excluded up to masses of 2.45 (2.47) TeV at 95% confidence level. The neutral current decays of excited leptons are considered for the first time, and limits are extended to include the possibility that the weight factors f and f ', which determine the couplings between standard model leptons and excited leptons via gauge mediated interactions, have opposite sign.
Book Synopsis 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 by : [Study Group] ATLAS Collaboration CERN
Download or read book 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 published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Book Synopsis A Search for New Physics with High Mass Tau Pairs in Proton-antiproton Collisions at [square Root] S by : Zongru Wan
Download or read book A Search for New Physics with High Mass Tau Pairs in Proton-antiproton Collisions at [square Root] S written by Zongru Wan and published by . This book was released on 2005 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Search for Excited Leptons in Pp Collisions at Sqrt(s) by :
Download or read book A Search for Excited Leptons in Pp Collisions at Sqrt(s) written by and published by . This book was released on 2011 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for excited leptons is carried out with the CMS detector at the LHC, using 36 inverse picobarns of pp collision data recorded at sqrt(s) = 7 TeV. The search is performed for associated production of a lepton and an oppositely charged excited lepton pp to l l*, followed by the decay l* to l gamma, resulting in the l l gamma final state, where l = electron or muon. No excess of events above the standard model expectation is observed. Interpreting the findings in the context of l* production through four-fermion contact interactions and subsequent decay via electroweak processes, first upper limits are reported for l* production at this collision energy. The exclusion region in the compositeness scale Lambda and excited lepton mass M(l*) parameter space is extended beyond previously established limits. For Lambda = M(l*), excited lepton masses are excluded below 1070 GeV/c2̂ for e* and 1090 GeV/c2̂ for mu* at the 95% confidence level.
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