WorldCat Identities

Jakobs, Karl 1959-

Overview
Works: 96 works in 102 publications in 2 languages and 371 library holdings
Genres: Academic theses 
Roles: dgs, Author, Translator, Inventor
Publication Timeline
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Most widely held works by Karl Jakobs
Untersuchung der Produktionseigenschaften der W- und Z-Bosonen in pp-Kollisionen und Vergleich mit QCD-Modellen by Karl Jakobs( Book )

2 editions published in 1988 in German and held by 24 WorldCat member libraries worldwide

Entwicklung und Charakterisierung von spektroskopischen und ortsauflösenden Cadmiumtellurid-Halbleiterdetektorsystemen by Andreas Zwerger( )

1 edition published in 2014 in German and held by 17 WorldCat member libraries worldwide

Search for supersymmetry in events with missing transverse energy and b-Jets with the ATLAS detector = Suche nach Supersymmetrie in Ereignissen mit fehlender transversaler Energie und b-Jets mit dem ATLAS-Detektor by Stefan Winkelmann( )

1 edition published in 2012 in English and held by 17 WorldCat member libraries worldwide

Zusammenfassung: In this thesis, searches for Supersymmetry (SUSY) with the ATLAS detector at the Large Hadron Collider (LHC) at a center-of-mass energy of 7 TeV are presented. The focus lies on two searches for squarks of the third generation, specifically the direct production of stop pairs and the production of stops via the decay of gluinos. The searches are based on experimental signatures with large missing transverse energy, b-quark jets and one electron or muon. The datasets used correspond to an integrated luminosity of 4.7 fb-1 and 2.05 fb-1, respectively. Inclusive observables, which are sensitive to the mass scale of SUSY particles are used to discriminate the signal from the Standard Model (SM) background processes. In both analyses, dedicated background estimation techniques are used. Control samples in data are used to supplement or replace the background estimation from Monte Carlo simulation. No significant excess beyond the SM expectation is found. Therefore, both model independent upper limits on physics beyond the SM are derived and model specific interpretations are given
Double-sided 3D silicon detectors for the high-luminosity LHC = Doppelseitige 3D-Siliziumdetektoren für den High-Luminosity LHC by Michael Köhler( )

1 edition published in 2011 in English and held by 17 WorldCat member libraries worldwide

Search for Higgs bosons with b-jets in the final state in proton-proton collisions with the ATLAS experiment by Daniel Büscher( )

1 edition published in 2016 in English and held by 17 WorldCat member libraries worldwide

Zusammenfassung: This thesis discusses searches for Higgs bosons in decays with b-quark jets in the final state in data from proton-proton collisions taken with the ATLAS detector at the Large Hadron Collider (LHC).First, a search for the Standard Model (SM) Higgs boson in the associated production with a vector boson and the decay to b-quarks, VH(bb), is presented. It is based on the data recorded during Run 1 of the LHC at a center-of-mass energy of sqrt(s) = 8 TeV, corresponding to an integrated luminosity of 20.3/fb. Other SM processes yield backgrounds with cross sections much larger than for the expected Higgs boson signal. Their contribution is efficiently separated from the signal using Boosted Decision Trees (BDT). The signal contribution is estimated using a profile likelihood fit of the BDT output distributions.The signal strength with respect to the SM expectation is measured to be 0.65+0.43-0.40, corresponding to an observed (expected) significance of 1.7 (2.5) standard deviations. In combination with the analysis performed using the data taken at sqrt(s) = 7 TeV the signal strength is measured to be 0.51+0.40-0.37, corresponding to an observed (expected) significance of 1.4 (2.6) standard deviations.Additionally, a sensitivity estimate of the SM Higgs boson produced in gluon-fusion and decaying to two b quarks, gg->H->bb, is presented. This feasibility study is based on the data taken at sqrt(s) = 8 TeV. The expected statistical significance has been estimated to be 0.7 standard deviations from a likelihood ratio based on the dijet mass.The second analysis presented in this thesis is a search for decays of the Higgs boson to Beyond Standard Model (BSM) particles that are invisible to the ATLAS detector. The search has been performed in the associated production with a hadronically decaying vector boson, V(qq)H(inv). Also this analysis is based on the data taken at sqrt(s) = 8 TeV
Electroweak interactions, the Higgs Boson, and the search for new heavy Bosons by Karsten Köneke( )

1 edition published in 2017 in English and held by 17 WorldCat member libraries worldwide

Search for the neutral Higgs boson in H -> WW* -> lvlv decays with the ATLAS experiment by Phuong Nguyen Dang( )

1 edition published in 2016 in English and held by 17 WorldCat member libraries worldwide

A Measurement of W Boson pair production in pp collisions at sqrt(s)=8 TeV with the ATLAS experiment by Philip Sommer( )

1 edition published in 2016 in English and held by 17 WorldCat member libraries worldwide

Zusammenfassung: In this thesis, measurements of the W boson pair production cross section in proton-proton collisions at a centre-of-mass energy of 8 TeV are presented. A dataset corresponding to an integrated luminosity of 22.3 /fb recorded by the ATLAS experiment in the year 2012 is used. The W bosons are identified by their decay products of exactly two leptons with opposite electrical charge, electrons or muons, and missing transverse momentum induced by their corresponding neutrinos. First, a measurement restricted to final states without hadronic jets is presented and differential fiducial cross sections, total cross sections and limits on anomalous triple gauge boson couplings are obtained. A second measurement of the fiducial cross section in association with exactly one hadronic jet is presented. The ratio of fiducial cross sections for different jet multiplicities is reported and the combined fiducial cross section is extrapolated to the total phase space
The search for direct top-squark production in Hadronic final states with the ATLAS detector at [square roots]s = 13 TeV by Christian Lüdtke( )

1 edition published in 2018 in English and held by 16 WorldCat member libraries worldwide

Abstract: Supersymmetry poses one of the best motivated theories for particle physics beyond the Standard Model. It can provide a dark matter candidate and enable grand unification. The supersymmetric partner of the top quark, the top squark, can provide a cancellation of diverging radiative corrections to the Higgs-boson mass and thereby avoid the hierarchy problem of the Standard Model.<br><br>In this thesis, a search for top squarks in final states with jets and missing transverse momentum is presented. Proton-proton collisions at a centre-of-mass energy of √s = 13 TeV, produced by the Large Hadron Collider, were recorded by the ATLAS detector. The analysed dataset corresponds to an integrated luminosity of 36.1 fb-1. No significant excess above the Standard Model background was observed. The analysis results are interpreted as exclusion limits on the top-squark mass and the neutralino mass in various scenarios that address specific aspects of the supersymmetry
First measurement of the Z/gamma*->tautau cross section in proton-proton collisions at sqrt(s) 7 TeV with the ATLAS experiment at the LHC by Susanne Kühn( )

2 editions published in 2012 in English and held by 12 WorldCat member libraries worldwide

Der Tag der Tiere Erzählungen by Felix Timmermans( Book )

2 editions published in 1950 in German and held by 6 WorldCat member libraries worldwide

The physics results of the UA2 experiment at the CERN pp̄ collider by Karl Jakobs( Book )

2 editions published in 1994 in German and English and held by 5 WorldCat member libraries worldwide

Search for squarks and gluinos in final states with jets and missing transverse momentum at s√ =13 TeVwith the ATLAS detector by Hannah Arnold( )

1 edition published in 2016 in English and held by 3 WorldCat member libraries worldwide

Abstract: A search for squarks and gluinos in final states containing hadronic jets, missing transverse momentum but no electrons or muons is presented. The data were recorded in 2015 by the ATLAS experiment in s√=13 TeV proton-proton collisions at the Large Hadron Collider. No excess above the Standard Model background expectation was observed in 3.2 fb−1 of analyzed data. Results are interpreted within simplified models that assume R-parity is conserved and the neutralino is the lightest supersymmetric particle. An exclusion limit at the 95 % confidence level on the mass of the gluino is set at 1.51 TeV for a simplified model incorporating only a gluino octet and the lightest neutralino, assuming the lightest neutralino is massless. For a simplified model involving the strong production of mass-degenerate first- and second-generation squarks, squark masses below 1.03 TeV are excluded for a massless lightest neutralino. These limits substantially extend the region of supersymmetric parameter space excluded by previous measurements with the ATLAS detector
Constraints on new phenomena via Higgs boson couplings and invisible decays with the ATLAS detector by Simone Amoroso( )

1 edition published in 2015 in English and held by 3 WorldCat member libraries worldwide

Test of CP invariance in vector-boson fusion production of the Higgs boson using the Optimal Observable method in the ditau decay channel with the ATLAS detector by Hannah Arnold( )

1 edition published in 2016 in English and held by 3 WorldCat member libraries worldwide

Constraints on mediator-based dark matter and scalar dark energy models using [square roots]s = 13 TeV pp collision data collected by the ATLAS detector by Anne Kathrin Becker( )

1 edition published in 2019 in English and held by 3 WorldCat member libraries worldwide

Abstract: Constraints on selected mediator-based dark matter models and a scalar dark energy model using up to 37 fb−1s√ = 13 TeV pp collision data collected by the ATLAS detector at the LHC during 2015-2016 are summarised in this paper. The results of experimental searches in a variety of final states are interpreted in terms of a set of spin-1 and spin-0 single-mediator dark matter simplified models and a second set of models involving an extended Higgs sector plus an additional vector or pseudo-scalar mediator. The searches considered in this paper constrain spin-1 leptophobic and leptophilic mediators, spin-0 colour-neutral and colour-charged mediators and vector or pseudo-scalar mediators embedded in extended Higgs sector models. In this case, also s√ = 8 TeV pp collision data are used for the interpretation of the results. The results are also interpreted for the first time in terms of light scalar particles that could contribute to the accelerating expansion of the universe (dark energy)
Search for supersymmetry with top-squarks and ATLAS data at a centre-of-mass energy of 13 TeV by Julian Wollrath( )

1 edition published in 2021 in English and held by 3 WorldCat member libraries worldwide

Abstract: Supersymmetric models are a well motivated extensions of the Standard Model of Particle Physics able to solve problems with the Standard Model, such as the hierarchy problem, and can give a dark matter candidate. The supersymmetric partner to the top-quark, the top-squark, gives radiative corrections to the Higgs boson mass motivating a top-squark mass close to the electroweak scale.<br><br>Here, a search for top-squark pair-production in final states with one lepton with ATLAS data at a centre-of-mass energy of 13 TeV is presented. The mass of the top-squark is assumed to be close to the sum of the masses of the lightest neutralino and the top-quark. With an integrated luminosity of 139 fb⁻¹ no significant excess above the Standard Model expectation was found, hence the result was interpreted as exclusion limits on the top-squark and neutralino masses.<br><br>To enable searches such as the one performed, as well as precisions measurements, a good understanding of the detector is paramount. One crucial part in the reconstruction of tracks of charged particles is the knowledge of the exact position of the different tracking detector modules. These positions are determined in the detector alignment. Here, the determination of biases on track parameters remaining after the alignment is presented. A novel method for the determination of distortions of silicon pixel sensors with collision data and the correction of these distortions is presented as well
<> by Simone Amoroso( )

1 edition published in 2015 in English and held by 3 WorldCat member libraries worldwide

 
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Alternative Names
Jakobs, K. 1959-

Karl Jakobs deutscher Physiker

Karl Jakobs Duits natuurkundige

Karl Jakobs físic alemany

Karl Jakobs físico alemán

Karl Jakobs German physicist

Karl Jakobs niemiecki fizyk

Karl Jakobs physicien allemand

Karl Jakobs professor académico alemão

Karl Jakobs tysk fysikar

Karl Jakobs tysk fysiker

Languages
English (18)

German (6)