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Author: German Colón Publisher: ISBN: Category : Black holes (Astronomy) Languages : en Pages : 228
Book Description
Theories postulating extra spatial dimensions into which the gravitational field can propagate provide interesting extensions to the Standard Model addressing the hierarchy problem. These frameworks predict TeV-scale gravity signatures, such as black hole or string ball production, that could be observed at the Large Hadron Collider. Said black holes decay into a high multiplicity of particles with typical energies ranging in the few 100 GeV. The production of events with multiple high transverse momentum particles including charged leptons and jets is measured, using 13.0 fb 1 of proton-proton collision data recorded by the ATLAS detector during 2012 at s = 8 TeV. No excess beyond Standard Model expectations is observed, and upper limits on the cross sections for non-Standard Model production of these final states are set.
Author: German Colón Publisher: ISBN: Category : Black holes (Astronomy) Languages : en Pages : 228
Book Description
Theories postulating extra spatial dimensions into which the gravitational field can propagate provide interesting extensions to the Standard Model addressing the hierarchy problem. These frameworks predict TeV-scale gravity signatures, such as black hole or string ball production, that could be observed at the Large Hadron Collider. Said black holes decay into a high multiplicity of particles with typical energies ranging in the few 100 GeV. The production of events with multiple high transverse momentum particles including charged leptons and jets is measured, using 13.0 fb 1 of proton-proton collision data recorded by the ATLAS detector during 2012 at s = 8 TeV. No excess beyond Standard Model expectations is observed, and upper limits on the cross sections for non-Standard Model production of these final states are set.
Author: Publisher: ISBN: Category : Languages : en Pages : 18
Book Description
In this paper, a search for physics beyond the Standard Model, in final states with at least one high transverse momentum charged lepton (electron or muon) and two additional high transverse momentum leptons or jets, is performed using 3.2 fb-1 of proton–proton collision data recorded by the ATLAS detector at the Large Hadron Collider in 2015 at √s=13 TeV. The upper end of the distribution of the scalar sum of the transverse momenta of leptons and jets is sensitive to the production of high-mass objects. No excess of events beyond Standard Model predictions is observed. Finally, exclusion limits are set for models of microscopic black holes with two to six extra dimensions.
Author: Lesya Horyn Publisher: Springer Nature ISBN: 3030916723 Category : Science Languages : en Pages : 146
Book Description
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).
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
The authors report the results from a search for t[anti t] production in p[anti p] collisions at [radical]s = 1.8 TeV with the D0 detector at Fermilab in the final states consisting of one isolated high p[sub T] lepton (e or [mu]), multiple jets and a substantial missing transverse energy (E[sub T]), excluding the events that have [mu]-tagged jets. Two independent analysis approaches lead them to similar estimates for the cross-section. They see no conclusive evidence for top production in the 13.5 pb[sup [minus]1] of data taken during the 1992--1993 run of the Tevatron.
Author: Brokk Koen Toggerson Publisher: ISBN: 9781267652386 Category : Languages : en Pages : 159
Book Description
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.
Author: [Study Group] ATLAS Collaboration CERN Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
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
Author: Publisher: ISBN: Category : Languages : en Pages : 7
Book Description
The authors report the results from a search for t{anti t} production in p{anti p} collisions at √s = 1.8 TeV with the D0 detector at Fermilab in the final states consisting of one isolated high p{sub T} lepton (e or?), multiple jets and a substantial missing transverse energy (E{sub T}), excluding the events that have?-tagged jets. Two independent analysis approaches lead them to similar estimates for the cross-section. They see no conclusive evidence for top production in the 13.5 pb−1 of data taken during the 1992--1993 run of the Tevatron.
![Search for TeV-scale Gravity Signatures in Final States with Leptons and Jets with the ATLAS Detector at [square Root Of] PDF](https://books.google.com/books/content/images/frontcover/U8V1AQAACAAJ?fife=w150-h200)
Author: German Colón![Search for TeV-scale Gravity Signatures in Final States with Leptons and Jets with the ATLAS Detector at [square Root Of] PDF](https://books.google.com/books/content/images/frontcover/U8V1AQAACAAJ?fife=w80-h100)
Author: German Colón
Author: 
Author: Lesya Horyn![A Search for T[anti T] [yields] Lepton + E[sub T] + Jets Signature in P[anti P] Collisions at [radical] PDF](https://books.google.com/books/content/images/frontcover/NInTjwEACAAJ?fife=w80-h100)
Author: 
Author: Janna Katharina Behr
Author: Boris Lemmer
Author: Harisankar Namasivayam![Search for Direct Gaugino Production Decaying to Two Leptons and Missing Transverse Momentum at ATLAS with [square Root] (s) PDF](https://books.google.com/books/content/images/frontcover/hZzSoAEACAAJ?fife=w80-h100)
Author: Brokk Koen Toggerson![Search for Type-III Seesaw Heavy Leptons in Leptonic Final States in Pp Collisions at [square Root]s PDF](https://books.google.com/books/content/images/frontcover/QJrNzwEACAAJ?fife=w80-h100)
Author: [Study Group] ATLAS Collaboration CERN
Author: