@article{OPUS4-17221,
  title     = {Evidence for the \(H\) → \({b\overline{b}}\) decay with the ATLAS detector},
  series = {Journal of High Energy Physics},
  volume    = {24},
  journal   = {Journal of High Energy Physics},
  organization    = {The ATLAS Collaboration},
  doi       = {10.1007/JHEP12(2017)024},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-172216},
  year      = {2017},
  abstract  = {A search for the decay of the Standard Model Higgs boson into a \({b\overline{b}}\) pair when produced in association with a \(W\) or \(Z\) boson is performed with the ATLAS detector. The analysed data, corresponding to an integrated luminosity of 36.1 fb\(^{-1}\), were collected in proton-proton collisions in Run 2 of the Large Hadron Collider at a centre-of-mass energy of 13 TeV. Final states containing zero, one and two charged leptons (electrons or muons) are considered, targeting the decays \(Z\) → \({νν}\), \(W\) → \({ℓν}\) and \(Z\) → \({ℓℓ}\). For a Higgs boson mass of 125 GeV, an excess of events over the expected background from other Standard Model processes is found with an observed significance of 3.5 standard deviations, compared to an expectation of 3.0 standard deviations. This excess provides evidence for the Higgs boson decay into b-quarks and for its production in association with a vector boson. The combination of this result with that of the Run 1 analysis yields a ratio of the measured signal events to the Standard Model expectation equal to 0.90 ± 0.18(stat.)\(^{+0.21}_{-0.19}\)(syst.). Assuming the Standard Model production cross-section, the results are consistent with the value of the Yukawa coupling to \(b\)-quarks in the Standard Model.},
  language  = {en}
}
@article{OPUS4-17323,
  title     = {Probing the \(W tb\) vertex structure in \(t\)-channel single-top-quark production and decay in \(pp\) collisions at \(\sqrt{s}\) = 8 TeV with the ATLAS detector},
  series = {Journal of High Energy Physics},
  volume    = {2017},
  journal   = {Journal of High Energy Physics},
  number    = {04},
  organization    = {The ATLAS Collaboration},
  doi       = {https://doi.org/10.1007/JHEP04(2017)124},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-173234},
  year      = {2017},
  abstract  = {To probe the \(W tb\) vertex structure, top-quark and \(W\)-boson polarisation observables are measured from \(t\)-channel single-top-quark events produced in proton-proton collisions at a centre-of-mass energy of 8 TeV. The dataset corresponds to an integrated luminosity of 20.2 fb\(^{-1}\), recorded with the ATLAS detector at the LHC. Selected events contain one isolated electron or muon, large missing transverse momentum and exactly two jets, with one of them identified as likely to contain a \(b\)-hadron. Stringent selection requirements are applied to discriminate \(t\)-channel single-top-quark events from background. The polarisation observables are extracted from asymmetries in angular distributions measured with respect to spin quantisation axes appropriately chosen for the top quark and the \(W\) boson. The asymmetry measurements are performed at parton level by correcting the observed angular distributions for detector effects and hadronisation after subtracting the background contributions. The measured top-quark and \(W\)-boson polarisation values are in agreement with the Standard Model predictions. Limits on the imaginary part of the anomalous coupling \(g_R\) are also set from model independent measurements.},
  language  = {en}
}
@article{OPUS4-17318,
  title     = {Measurement of the \(k_t\) splitting scales in \(Z → ℓℓ\) events in \(pp\) collisions at \(\sqrt{s}=8\) TeV with the ATLAS detector},
  series = {Journal of High Energy Physics},
  volume    = {2017},
  journal   = {Journal of High Energy Physics},
  number    = {08},
  organization    = {The ATLAS Collaboration},
  doi       = {10.1007/JHEP08(2017)026},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-173180},
  year      = {2017},
  abstract  = {A measurement of the splitting scales occuring in the \(k_t\) jet-clustering algorithm is presented for final states containing a \(Z\) boson. The measurement is done using 20.2 fb\(^{-1}\) of proton-proton collision data collected at a centre-of-mass energy of \(\sqrt{s} = 8\) TeV by the ATLAS experiment at the LHC in 2012. The measurement is based on charged-particle track information, which is measured with excellent precision in the \(p_T\) region relevant for the transition between the perturbative and the non-perturbative regimes. The data distributions are corrected for detector effects, and are found to deviate from state-of-the-art predictions in various regions of the observables.},
  language  = {en}
}
@article{OPUS4-17354,
  title     = {Measurements of top-quark pair to \(Z\)-boson cross-section ratios at \(\sqrt{s}\) \(=13 , 8, 7\) TeV with the ATLAS detector},
  series = {Journal of High Energy Physics},
  volume    = {2017},
  journal   = {Journal of High Energy Physics},
  number    = {02},
  organization    = {The ATLAS Collaboration},
  doi       = {10.1007/JHEP02(2017)117},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-173544},
  year      = {2017},
  abstract  = {Ratios of top-quark pair to \(Z\)-boson cross sections measured from proton-proton collisions at the LHC centre-of-mass energies of \(\sqrt{s}\) = 13 TeV, 8 TeV, and 7 TeV are presented by the ATLAS Collaboration. Single ratios, at a given \(\sqrt{s}\) for the two processes and at different \(\sqrt{s}\) for each process, as well as double ratios of the two processes at different \(\sqrt{s}\), are evaluated. The ratios are constructed using previously published ATLAS measurements of the \({t\overline{t}}\) and \(Z\)-boson production cross sections, corrected to a common phase space where required, and a new analysis of \(Z\) → ℓ\(^+\)ℓ\(^-\) where ℓ = \(e, µ\) at \(\sqrt{s}\) = 13 TeV performed with data collected in 2015 with an integrated luminosity of 3.2 fb\(^-1\). Correlations of systematic uncertainties are taken into account when evaluating the uncertainties in the ratios. The correlation model is also used to evaluate the combined cross section of the \(Z\) → \(e\)\(^+\)\(e\)\(^-\) and the \(Z\) → \(µ\)\(^+\)\(µ\)\(^-\) channels for each \(\sqrt{s}\) value. The results are compared to calculations performed at next-to-next-to-leading-order accuracy using recent sets of parton distribution functions. The data demonstrate significant power to constrain the gluon distribution function for the Bjorken-\(x\) values near 0.1 and the light-quark sea for \(x\) < 0.02.},
  language  = {en}
}
@article{OPUS4-17361,
  title     = {Measurement of the \(ZZ\) production cross section in proton-proton collisions at \(\sqrt{s}\) = 8 TeV using the \(ZZ\) → \(ℓ^-ℓ^+ℓ^{′-}ℓ^{′+}\) and \(ZZ\) → \(ℓ^-ℓ^+{ν\overline{ν}}\) decay channels with the ATLAS detector},
  series = {Journal of High Energy Physics},
  volume    = {2017},
  journal   = {Journal of High Energy Physics},
  number    = {99},
  organization    = {The ATLAS Collaboration},
  doi       = {10.1007/JHEP01(2017)099},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-173616},
  year      = {2017},
  abstract  = {A measurement of the \(ZZ\) production cross section in the \(ℓ^-ℓ^+ℓ^{′-}ℓ^{′+}\) and \(ℓ^-ℓ^+{ν\overline{ν}}\) channels (ℓ = e, µ) in proton-proton collisions at \(\sqrt{s}\) = 8TeV at the Large Hadron Collider at CERN, using data corresponding to an integrated luminosity of 20.3 fb\(^{-1}\) collected by the ATLAS experiment in 2012 is presented. The fiducial cross sections for \(ZZ\) → \(ℓ^-ℓ^+ℓ^{′-}ℓ^{′+}\) and \(ZZ\) → \(ℓ^-ℓ^+{ν\overline{ν}}\) are measured in selected phase-space regions. The total cross section for \(ZZ\) events produced with both \(Z\) bosons in the mass range 66 to 116GeV is measured from the combination of the two channels to be 7.3 ± 0.4(stat) ± 0.3 (syst)\(^{-0.2}_{-0.1}\) (lumi) pb, which is consistent with the Standard Model prediction of 6.6\(^{+0.7}_{-0.6}\) pb. The differential cross sections in bins of various kinematic variables are presented. The differential event yield as a function of the transverse momentum of the leading \(Z\) boson is used to set limits on anomalous neutral triple gauge boson couplings in \(ZZ\) production.},
  language  = {en}
}
@article{OPUS4-17366,
  title     = {Measurement of the \({t\overline{t}}Z\) and \({t\overline{t}}W\) production cross sections in multilepton final states using 3.2 fb\(^{-1}\) of \(pp\) collisions at \(\sqrt{s}\) = 13 TeV with the ATLAS detector},
  series = {European Physical Journal C},
  volume    = {77},
  journal   = {European Physical Journal C},
  number    = {40},
  organization    = {The ATLAS Collaboration},
  doi       = {10.1140/epjc/s10052-016-4574-y},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-173662},
  year      = {2017},
  abstract  = {A measurement of the \({t\overline{t}}Z\) and \({t\overline{t}}W\) production cross sections in final states with either two same-charge muons, or three or four leptons (electrons or muons) is presented. The analysis uses a data sample of proton-proton collisions at \(\sqrt{s}\) = 13 TeV recorded with the ATLAS detector at the Large Hadron Collider in 2015, corresponding to a total integrated luminosity of 3.2 fb\(^{-1}\). The inclusive cross sections are extracted using likelihood fits to signal and control regions, resulting in \(\sigma_{{t\overline{t}}Z}\) = 0.9 ± 0.3 pb and \(\sigma_{{t\overline{t}}W}\) = 1.5 ± 0.8 pb, in agreement with the Standard Model predictions.},
  language  = {en}
}
@article{OPUS4-17322,
  title     = {Studies of \(Zγ\) production in association with a high-mass dijet system in \(pp\) collisions at \(\sqrt{s}\) = 8 TeV with the ATLAS detector},
  series = {Journal of High Energy Physics},
  volume    = {2017},
  journal   = {Journal of High Energy Physics},
  number    = {07},
  organization    = {The ATLAS Collaboration},
  doi       = {https://doi.org/10.1007/JHEP07(2017)107},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-173229},
  year      = {2017},
  abstract  = {The production of a \(Z\) boson and a photon in association with a high-mass dijet system is studied using 20.2 fb\(^{-1}\) of proton-proton collision data at a centre-of-mass energy of \(\sqrt{s}\) = 8 TeV recorded with the ATLAS detector in 2012 at the Large Hadron Collider. Final states with a photon and a Z boson decaying into a pair of either electrons, muons, or neutrinos are analysed. Electroweak and total \(pp\) → \(Zγjj\) cross-sections are extracted in two fiducial regions with different sensitivities to electroweak production processes. Quartic couplings of vector bosons are studied in regions of phase space with an enhanced contribution from pure electroweak production, sensitive to vector-boson scattering processes \(V V → Zγ\). No deviations from Standard Model predictions are observed and constraints are placed on anomalous couplings parameterized by higher-dimensional operators using effective field theory.},
  language  = {en}
}
@article{HoffmannPfeilAlfonsoetal.2016,
  author    = {Hoffmann, Angelika and Pfeil, Johannes and Alfonso, Julieta and Kurz, Felix T. and Sahm, Felix and Heiland, Sabine and Monyer, Hannah and Bendszus, Martin and Mueller, Ann-Kristin and Helluy, Xavier and Pham, Mirko},
  title     = {Experimental Cerebral Malaria Spreads along the Rostral Migratory Stream},
  series = {PLoS Pathogens},
  volume    = {12},
  journal   = {PLoS Pathogens},
  number    = {3},
  doi       = {10.1371/journal.ppat.1005470},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-167434},
  pages     = {e1005470},
  year      = {2016},
  abstract  = {It is poorly understood how progressive brain swelling in experimental cerebral malaria (ECM) evolves in space and over time, and whether mechanisms of inflammation or microvascular sequestration/obstruction dominate the underlying pathophysiology. We therefore monitored in the Plasmodium berghei ANKA-C57BL/6 murine ECM model, disease manifestation and progression clinically, assessed by the Rapid-Murine-Coma-and-Behavioral-Scale (RMCBS), and by high-resolution in vivo MRI, including sensitive assessment of early blood-brain-barrier-disruption (BBBD), brain edema and microvascular pathology. For histological correlation HE and immunohistochemical staining for microglia and neuroblasts were obtained. Our results demonstrate that BBBD and edema initiated in the olfactory bulb (OB) and spread along the rostral-migratory-stream (RMS) to the subventricular zone of the lateral ventricles, the dorsal-migratory-stream (DMS), and finally to the external capsule (EC) and brainstem (BS). Before clinical symptoms (mean RMCBS = 18.5±1) became evident, a slight, non-significant increase of quantitative T2 and ADC values was observed in OB+RMS. With clinical manifestation (mean RMCBS = 14.2±0.4), T2 and ADC values significantly increased along the OB+RMS (p = 0.049/p = 0.01). Severe ECM (mean RMCBS = 5±2.9) was defined by further spread into more posterior and deeper brain structures until reaching the BS (significant T2 elevation in DMS+EC+BS (p = 0.034)). Quantitative automated histological analyses confirmed microglial activation in areas of BBBD and edema. Activated microglia were closely associated with the RMS and neuroblasts within the RMS were severely misaligned with respect to their physiological linear migration pattern. Microvascular pathology and ischemic brain injury occurred only secondarily, after vasogenic edema formation and were both associated less with clinical severity and the temporal course of ECM. Altogether, we identified a distinct spatiotemporal pattern of microglial activation in ECM involving primarily the OB+RMS axis, a distinct pathway utilized by neuroblasts and immune cells. Our data suggest significant crosstalk between these two cell populations to be operative in deeper brain infiltration and further imply that the manifestation and progression of cerebral malaria may depend on brain areas otherwise serving neurogenesis.},
  language  = {en}
}
@article{KochereshkoDurnevBesombesetal.2016,
  author    = {Kochereshko, Vladimir P. and Durnev, Mikhail V. and Besombes, Lucien and Mariette, Henri and Sapega, Victor F. and Askitopoulos, Alexis and Savenko, Ivan G. and Liew, Timothy C. H. and Shelykh, Ivan A. and Platonov, Alexey V. and Tsintzos, Simeon I. and Hatzopoulos, Z. and Savvidis, Pavlos G. and Kalevich, Vladimir K. and Afanasiev, Mikhail M. and Lukoshkin, Vladimir A. and Schneider, Christian and Amthor, Matthias and Metzger, Christian and Kamp, Martin and Hoefling, Sven and Lagoudakis, Pavlos and Kavokin, Alexey},
  title     = {Lasing in Bose-Fermi mixtures},
  series = {Scientific Reports},
  volume    = {6},
  journal   = {Scientific Reports},
  number    = {20091},
  doi       = {10.1038/srep20091},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-168152},
  year      = {2016},
  abstract  = {Light amplification by stimulated emission of radiation, well-known for revolutionising photonic science, has been realised primarily in fermionic systems including widely applied diode lasers. The prerequisite for fermionic lasing is the inversion of electronic population, which governs the lasing threshold. More recently, bosonic lasers have also been developed based on Bose-Einstein condensates of exciton-polaritons in semiconductor microcavities. These electrically neutral bosons coexist with charged electrons and holes. In the presence of magnetic fields, the charged particles are bound to their cyclotron orbits, while the neutral exciton-polaritons move freely. We demonstrate how magnetic fields affect dramatically the phase diagram of mixed Bose-Fermi systems, switching between fermionic lasing, incoherent emission and bosonic lasing regimes in planar and pillar microcavities with optical and electrical pumping. We collected and analyzed the data taken on pillar and planar microcavity structures at continuous wave and pulsed optical excitation as well as injecting electrons and holes electronically. Our results evidence the transition from a Bose gas to a Fermi liquid mediated by magnetic fields and light-matter coupling.},
  language  = {en}
}
@article{OPUS4-17247,
  title     = {Search for pair production of heavy vector-like quarks decaying to high-\(p_T\) \(W\) bosons and \(b\) quarks in the lepton-plus-jets final state in \(pp\) collisions at \(\sqrt{s}=13\) TeV with the ATLAS detector},
  series = {Journal of High Energy Physics},
  volume    = {2017},
  journal   = {Journal of High Energy Physics},
  number    = {141},
  organization    = {The ATLAS Collaboration},
  doi       = {10.1007/JHEP10(2017)141},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-172472},
  year      = {2017},
  abstract  = {A search is presented for the pair production of heavy vector-like \(T\) quarks, primarily targeting the \(T\) quark decays to a \(W\) boson and a \(b\)-quark. The search is based on 36.1 fb\(^{-1}\) of \(pp\) collisions at \(\sqrt{s}=13\) TeV recorded in 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider. Data are analysed in the lepton-plus-jets final state, including at least one \(b\)-tagged jet and a large-radius jet identified as originating from the hadronic decay of a high-momentum \(W\) boson. No significant deviation from the Standard Model expectation is observed in the reconstructed \(T\) mass distribution. The observed 95\% confidence level lower limit on the \(T\) mass are 1350 GeV assuming 100\% branching ratio to \(Wb\). In the SU(2) singlet scenario, the lower mass limit is 1170 GeV. This search is also sensitive to a heavy vector-like \(B\) quark decaying to \(Wt\) and other final states. The results are thus reinterpreted to provide a 95\% confidence level lower limit on the \(B\) quark mass at 1250 GeV assuming 100\% branching ratio to \(Wt\); in the SU(2) singlet scenario, the limit is 1080 GeV. Mass limits on both \(T\) and \(B\) production are also set as a function of the decay branching ratios. The 100\% branching ratio limits are found to be applicable to heavy vector-like \(Y\) and \(X\) production that decay to \(Wb\) and \(Wt\), respectively.},
  language  = {en}
}
@article{OPUS4-17246,
  title     = {Search for new high-mass phenomena in the dilepton final state using 36 fb\(^{-1}\) of proton-proton collision data at \(\sqrt{s}=13\) TeV with the ATLAS detector},
  series = {Journal of High Energy Physics},
  volume    = {2017},
  journal   = {Journal of High Energy Physics},
  number    = {182},
  organization    = {The ATLAS Collaboration},
  doi       = {10.1007/JHEP10(2017)182},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-172462},
  year      = {2017},
  abstract  = {A search is conducted for new resonant and non-resonant high-mass phenomena in dielectron and dimuon final states. The search uses 36.1 fb\(^{-1}\) of proton-proton collision data, collected at \(\sqrt{s}=13\) TeV by the ATLAS experiment at the LHC in 2015 and 2016. No significant deviation from the Standard Model prediction is observed. Upper limits at 95\% credibility level are set on the cross-section times branching ratio for resonances decaying into dileptons, which are converted to lower limits on the resonance mass, up to 4.1 TeV for the E\(_6\)-motivated \(Z^′_χ\). Lower limits on the \({qqℓℓ}\) contact interaction scale are set between 2.4 TeV and 40 TeV, depending on the model.},
  language  = {en}
}
@article{OPUS4-17312,
  title     = {Measurement of the inclusive jet cross-sections in proton-proton collisions at \(\sqrt{s}=8\) TeV with the ATLAS detector},
  series = {Journal of High Energy Physics},
  volume    = {2017},
  journal   = {Journal of High Energy Physics},
  number    = {09},
  organization    = {The ATLAS Collaboration},
  doi       = {10.1007/JHEP09(2017)020},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-173123},
  year      = {2017},
  abstract  = {Inclusive jet production cross-sections are measured in proton-proton collisions at a centre-of-mass energy of \(\sqrt{s} = 8\) TeV recorded by the ATLAS experiment at the Large Hadron Collider at CERN. The total integrated luminosity of the analysed data set amounts to 20.2 fb\(^{-1}\). Double-differential cross-sections are measured for jets defined by the anti-\(k_t\) jet clustering algorithm with radius parameters of \(R\) = 0.4 and \(R\) = 0.6 and are presented as a function of the jet transverse momentum, in the range between 70 GeV and 2.5 TeV and in six bins of the absolute jet rapidity, between 0 and 3.0. The measured cross-sections are compared to predictions of quantum chromodynamics, calculated at next-to-leading order in perturbation theory, and corrected for non-perturbative and electroweak effects. The level of agreement with predictions, using a selection of different parton distribution functions for the proton, is quantified. Tensions between the data and the theory predictions are observed.},
  language  = {en}
}
@article{OPUS4-17321,
  title     = {Search for direct top squark pair production in events with a Higgs or \(Z\) boson, and missing transverse momentum in \(\sqrt{s}\) = 13 TeV \(pp\) collisions with the ATLAS detector},
  series = {Journal of High Energy Physics},
  volume    = {2017},
  journal   = {Journal of High Energy Physics},
  number    = {08},
  organization    = {The ATLAS Collaboration},
  doi       = {https://doi.org/10.1007/JHEP08(2017)006},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-173210},
  year      = {2017},
  abstract  = {A search for direct top squark pair production resulting in events with either a same-flavour opposite-sign dilepton pair with invariant mass compatible with a \(Z\) boson or a pair of jets compatible with a Standard Model (SM) Higgs boson (\(h\)) is presented. Requirements on the missing transverse momentum, together with additional selections on leptons, jets, jets identified as originating from \(b\)-quarks are imposed to target the other decay products of the top squark pair. The analysis is performed using proton-proton collision data at \(\sqrt{s}\) = 13 TeV collected with the ATLAS detector at the LHC in 2015-2016, corresponding to an integrated luminosity of 36.1 fb\(^{-1}\). No excess is observed in the data with respect to the SM predictions. The results are interpreted in two sets of models. In the first set, direct production of pairs of lighter top squarks (\(\tilde{t}_1\)) with long decay chains involving \(Z\) or Higgs bosons is considered. The second set includes direct pair production of the heavier top squark pairs (\(\tilde{t}_2\)) decaying via \(\tilde{t}_2\) → \(Z\tilde{t}_1\) or \(\tilde{t}_2\) → \(h\tilde{t}_1\). The results exclude at 95\% confidence level \(\tilde{t}_2\) and \(\tilde{t}_1\) masses up to about 800 GeV, extending the exclusion region of supersymmetric parameter space covered by previous LHC searches.},
  language  = {en}
}
@article{UllherrDiezZabler2022,
  author    = {Ullherr, Maximilian and Diez, Matthias and Zabler, Simon},
  title     = {Robust image reconstruction strategy for multiscalar holotomography},
  series = {Journal of Imaging},
  volume    = {8},
  journal   = {Journal of Imaging},
  number    = {2},
  issn      = {2313-433X},
  doi       = {10.3390/jimaging8020037},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-262112},
  year      = {2022},
  abstract  = {Holotomography is an extension of computed tomography where samples with low X-ray absorption can be investigated with higher contrast. In order to achieve this, the imaging system must yield an optical resolution of a few micrometers or less, which reduces the measurement area (field of view = FOV) to a few mm at most. If the sample size, however, exceeds the field of view (called local tomography or region of interest = ROI CT), filter problems arise during the CT reconstruction and phase retrieval in holotomography. In this paper, we will first investigate the practical impact of these filter problems and discuss approximate solutions. Secondly, we will investigate the effectiveness of a technique we call "multiscalar holotomography", where, in addition to the ROI CT, a lower resolution non-ROI CT measurement is recorded. This is used to avoid the filter problems while simultaneously reconstructing a larger part of the sample, albeit with a lower resolution in the additional area.},
  language  = {en}
}
@article{OPUS4-17272,
  title     = {Measurement of inclusive and differential cross sections in the \(H\) → \({ZZ}^*\) → \(4{ℓ}\) decay channel in \({pp}\) collisions at \(\sqrt{s} = 13\) TeV with the ATLAS detector},
  series = {Journal of High Energy Physics},
  volume    = {2017},
  journal   = {Journal of High Energy Physics},
  number    = {10},
  organization    = {The ATLAS Collaboration},
  doi       = {https://doi.org/10.1007/JHEP10(2017)132},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-172724},
  year      = {2017},
  abstract  = {Inclusive and differential fiducial cross sections of Higgs boson production in proton-proton collisions are measured in the \(H\) → \({ZZ^*}\) → \(4{ℓ}\) decay channel. The proton-proton collision data were produced at the Large Hadron Collider at a centre-of-mass energy of 13 TeV and recorded by the ATLAS detector in 2015 and 2016, corresponding to an integrated luminosity of 36.1 fb\(^{-1}\). The inclusive fiducial cross section in the \(H\) → \({ZZ^*}\) → \(4{ℓ}\) decay channel is measured to be 3.62 ± 0.50(stat)\(^{+0.25}_{- 0.20}\) (sys) fb, in agreement with the Standard Model prediction of 2.91 ± 0.13 fb. The cross section is also extrapolated to the total phase space including all Standard Model Higgs boson decays. Several differential fiducial cross sections are measured for observables sensitive to the Higgs boson production and decay, including kinematic distributions of jets produced in association with the Higgs boson. Good agreement is found between data and Standard Model predictions. The results are used to put constraints on anomalous Higgs boson interactions with Standard Model particles, using the pseudo-observable extension to the kappa-framework.},
  language  = {en}
}
@article{OPUS4-17256,
  title     = {Search for top quark decays \(t → qH\), with \(H → γγ\), in \(\sqrt{s} = 13\) TeV \(pp\) collisions using the ATLAS detector},
  series = {Journal of High Energy Physics},
  volume    = {2017},
  journal   = {Journal of High Energy Physics},
  number    = {10},
  organization    = {The ATLAS Collaboration},
  doi       = {https://doi.org/10.1007/JHEP10(2017)129},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-172568},
  year      = {2017},
  abstract  = {This article presents a search for flavour-changing neutral currents in the decay of a top quark into an up-type (\({q = c, u}\)) quark and a Higgs boson, where the Higgs boson decays into two photons. The proton-proton collision data set analysed amounts to 36.1 fb\(^{-1}\) at \(\sqrt{s} = 13\) TeV collected by the ATLAS experiment at the LHC. Top quark pair events are searched for, where one top quark decays into \(qH\) and the other decays into \(bW\). Both the hadronic and leptonic decay modes of the \(W\) boson are used. No significant excess is observed and an upper limit is set on the \({t → cH}\) branching ratio of 2.2 × 10\(^{-3}\) at the 95\% confidence level, while the expected limit in the absence of signal is 1.6 × 10\(^{-3}\). The corresponding limit on the \(tcH\) coupling is 0.090 at the 95\% confidence level. The observed upper limit on the \({t → uH}\) branching ratio is 2.4 × 10\(^{-3}\).},
  language  = {en}
}
@article{OPUS4-17216,
  title     = {Search for a scalar partner of the top quark in the jets plus missing transverse momentum final state at \(\sqrt{s}\) = 13 TeV with the ATLAS detector},
  series = {Journal of High Energy Physics},
  volume    = {12},
  journal   = {Journal of High Energy Physics},
  organization    = {The ATLAS Collaboration},
  doi       = {10.1007/JHEP12(2017)085},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-172161},
  year      = {2017},
  abstract  = {A search for pair production of a scalar partner of the top quark in events with four or more jets plus missing transverse momentum is presented. An analysis of 36.1 fb\(^{-1}\) of \(\sqrt{s}\) = 13 TeV proton-proton collisions collected using the ATLAS detector at the LHC yields no significant excess over the expected Standard Model background. To interpret the results a simplified supersymmetric model is used where the top squark is assumed to decay via \(\tilde{t}_1\) → \(t^{(∗)}\)\(\tilde{χ}^0_1\) and \(\tilde{t}_1\) → \(b\tilde{χ}^±_1\) → \({bW}^{(∗)}\tilde{χ}^0_1\), where \(\tilde{χ}^0_1\) (\(\tilde{χ}^±_1\)) denotes the lightest neutralino (chargino). Exclusion limits are placed in terms of the top-squark and neutralino masses. Assuming a branching ratio of 100\% to \(t\tilde{χ}^0_1\), top-squark masses in the range 450-1000 GeV are excluded for \(\tilde{χ}^0_1\) masses below 160 GeV. In the case where \(m_{\tilde{t}_1}\) ∼ \(m_t\) + \(m_{\tilde{χ}^0_1}\), top-squark masses in the range 235-590 GeV are excluded.},
  language  = {en}
}
@article{OPUS4-22066,
  title     = {Measurement of dijet azimuthal decorrelations in \({pp}\) collisions at root s=8 TeV with the ATLAS detector and determination of the strong coupling},
  series = {Physical Review D},
  volume    = {98},
  journal   = {Physical Review D},
  number    = {9},
  organization    = {The ATLAS Collaboration},
  doi       = {10.1103/PhysRevD.98.092004},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-220665},
  pages     = {1-31},
  year      = {2018},
  abstract  = {measurement of the rapidity and transverse momentum dependence of dijet azimuthal decorrelations is presented, using the quantity R-Delta phi. The quantity R-Delta phi specifies the fraction of the inclusive dijet events in which the azimuthal opening angle of the two jets with the highest transverse momenta is less than a given value of the parameter Delta phi(max). The quantity R-Delta phi is measured in proton-proton collisions at root s = 8 TeV as a function of the dijet rapidity interval, the event total scalar transverse momentum, and Delta phi(max). The measurement uses an event sample corresponding to an integrated luminosity of 20.2 fb(-1) collected with the ATLAS detector at the CERN Large Hadron Collider. Predictions of a perturbative QCD calculation at next-to-leading order in the strong coupling with corrections for nonperturbative effects are compared to the data. The theoretical predictions describe the data in the whole kinematic region. The data are used to determine the strong coupling alpha(S) and to study its running for momentum transfers from 260 GeV to above 1.6 TeV. Analysis that combines data at all momentum transfers results in alpha(S) (m(Z)) = 0.1127(- 0.0027) (+0.0063).},
  language  = {en}
}
@phdthesis{Dietrich2024,
  author    = {Dietrich, Philipp},
  title     = {Traveling Wave Magnetic Particle Imaging: Visuelle Stenosequantifizierung und Perkutane Transluminale Angioplastie im Gef{\"a}ßmodell},
  doi       = {10.25972/OPUS-35251},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-352517},
  school      = {Universit{\"a}t W{\"u}rzburg},
  year      = {2024},
  abstract  = {Magnetic Particle Imaging (MPI) ist ein innovatives tomographisches Bildgebungs­verfahren, mit dem Tracerpartikel {\"a}ußerst sensitiv und schnell mehrdimensional abgebildet werden k{\"o}nnen. Die Methode basiert auf der nichtlinearen Magnetisierungs­antwort superparamagnetischer Eisenoxidnanopartikel (SPION) in einem Messpunkt, welcher ein Messvolumen rastert. In vorliegender Arbeit wurde das sog. Traveling Wave MPI (TWMPI) Verfahren eingesetzt, wodurch im Vergleich zu konventionellen MPI-Scannern ein gr{\"o}ßeres Field of View (FOV) und eine geringere Latenz bis zur Bildanzeige erreicht werden konnte. TWMPI weist einige f{\"u}r medizinische Zwecke vielversprechende Eigenschaften auf: Es liefert zwei- und dreidimensionale Bildrekonstruktionen in Echtzeit mit hoher zeitlicher und r{\"a}umlicher Aufl{\"o}sung. Dabei ist die Bildgebung von Grund auf hintergrundfrei und erfordert keinerlei ionisierende Strahlung. Zudem ist die Technik {\"a}ußerst sensitiv und kann SPION-Tracer noch in mikromolaren Konzentrationen detektieren. Ziel dieser Arbeit war es daher zu untersuchen, inwiefern es mittels TWMPI m{\"o}glich ist, k{\"u}nstliche Stenosen im Gef{\"a}ßmodell visuell in Echtzeit darzustellen und quantitativ zu beurteilen sowie {\"u}berdies eine perkutane transluminale Angioplastie (PTA) im Gef{\"a}ßmodell unter TWMPI-Echtzeit-Bildgebung durchzuf{\"u}hren. Alle Experimente wurden in einem speziell angefertigten TWMPI-Scanner durchgef{\"u}hrt (JMU W{\"u}rzburg, Experimentelle Physik V (Biophysik), FOV: 65 x 29 x 29 mm³, Aufl{\"o}sung: ca. 1.5 - 2 mm). Die Lumen-Darstellungen erfolgten mittels des SPION-Tracers Ferucarbotran in einer Verd{\"u}nnung von 1 : 50 (entspr. 10 mmol [Fe]/l). Das PTA-Instrumentarium wurde mit eigens hergestelltem ferucarbotran­haltigem Lack (100 mmol [Fe]/l) markiert. F{\"u}r die verschiedenen Teilexperimente wurden den jeweiligen speziellen Anforderungen entsprechend mehrere Gef{\"a}ßmodelle handgefertigt. F{\"u}r die visuelle Stenosequantifizierung wurden f{\"u}nf starre Stenosephantome unterschiedlicher Stenosierung (0\%, 25\%, 50\%, 75\%, 100\%) aus Polyoxymethylen her­gestellt (l: 40 mm, ID: 8 mm). Die Gef{\"a}ßmodelle wurden mehrfach zentral im FOV platz­iert und das stenosierte Lumen mittels sog. Slice-Scanning Modus (SSM, Einzel­aufnahme inkl. 10 Mittelungen: 200 ms, Bildfrequenz: 5 Bilder pro Sekunde, Latenz: ca. 100 ms) als zweidimensionale Quasi-Projektionen abgebildet. Diese Aufnahmen (n = 80, 16 je Phantom) wurden mit einer ein­heitlichen Grauskalierung versehen und anschließend entsprechend den NASCET-Kriterien visuell ausgewertet. Alle achtzig Aufnahmen waren unabh{\"a}ngig vom Stenosegrad aufgrund einheitlicher Fensterung sowie konstanter Scannerparameter untereinander gut vergleichbar. Niedrig­gradige Stenosen konnten insgesamt genauer abgebildet werden als h{\"o}hergradige, was sich neben der subjektiven Bildqualit{\"a}t auch in geringeren Standardabweichungen zeigte (0\%: 3.70 \% ± 2.71, 25\%: 18.64 \% ± 1.84, 50\%: 52.82 \% ± 3.66, 75\%: 77.84 \% ± 14.77, 100\%: 100 \% ± 0). Mit zunehmendem Stenosegrad kam es vermehrt zu geometrischen Ver­zerrungen im Zentrum, sodass bei den 75\%-Stenosen eine breitere Streuung der Messwerte mit einer h{\"o}heren Standardabweichung von 14.77\% einherging. Leichte, randst{\"a}ndige Artefakte konnten bei allen Datens{\"a}tzen beobachtet werden. F{\"u}r die PTA wurden drei interaktive Gef{\"a}ßmodelle aus Polyvinylchlorid (l: 100 mm, ID: 8 mm) mit zu- und abf{\"u}hrendem Schlauchsystem entwickelt, welche mittels Kabelband von außen hochgradig eingeengt werden konnten. Analog zu einer konventionellen PTA mittels r{\"o}ntgenbasierter digitaler Subtraktionsangiographie (DSA), wurden alle erforder­lichen Arbeitsschritte (Gef{\"a}ßdarstellung, Drahtpassage, Ballonplatzierung, Angioplastie, Erfolgskontrolle) unter (TW)MPI-Echtzeit-Bildgebung (Framerate: 2 - 4 FPS, Latenz: ca. 100 ms) abgebildet bzw. durchgef{\"u}hrt. Im Rahmen der PTA war eine Echtzeit-Visualisierung der Stenose im Gef{\"a}ßmodell durch Tracer-Bolusgabe sowie die F{\"u}hrung des markierten Instrumentariums zum Zielort m{\"o}glich. Die Markierung der Instrumente hielt der Beanspruchung w{\"a}hrend der Prozedur stand und erm{\"o}glichte eine genaue Platzierung des Ballonkatheters. Die Stenose konnte mittels Angioplastie-Ballons unter Echtzeit-Darstellung gesprengt werden und der Interventionserfolg im Anschluss durch erneute Visualisierung des Lumens validiert werden. Insgesamt zeigt sich MPI somit als ad{\"a}quate Bildgebungstechnik f{\"u}r die beiden in der Fragestellung bzw. Zielsetzung definierten experimentellen Anwendungen. Stenosen im Gef{\"a}ßmodell konnten erfolgreich in Echtzeit visualisiert und bildmorphologisch nach NASCET-Kriterien quantifiziert werden. Ebenso war eine PTA im Gef{\"a}ßmodell unter TWMPI-Echtzeit-Bildgebung machbar. Diese Ergebnisse unter­streichen das grundlegende Potenzial von MPI f{\"u}r medizinische Zwecke. Um zu den bereits etablierten Bildgebungsmethoden aufzuschließen, ist jedoch weitere Forschung im Bereich der Scanner-Hard- und -Software sowie bez{\"u}glich SPION-Tracern n{\"o}tig.},
  subject      = {Medizinische Radiologie},
  language  = {de}
}
@article{GlinzŠleichrtKytyřetal.2021,
  author    = {Glinz, Jonathan and Šleichrt, Jan and Kyt{\´y}ř, Daniel and Ayalur-Karunakaran, Santhosh and Zabler, Simon and Kastner, Johann and Senck, Sascha},
  title     = {Phase-contrast and dark-field imaging for the inspection of resin-rich areas and fiber orientation in non-crimp vacuum infusion carbon-fiber-reinforced polymers},
  series = {Journal of Materials Science},
  volume    = {56},
  journal   = {Journal of Materials Science},
  number    = {16},
  doi       = {10.1007/s10853-021-05907-0},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-351581},
  pages     = {9712-9727},
  year      = {2021},
  abstract  = {In this work, we present a multimodal approach to three-dimensionally quantify and visualize fiber orientation and resin-rich areas in carbon-fiber-reinforced polymers manufactured by vacuum infusion. Three complementary image modalities were acquired by Talbot-Lau grating interferometer (TLGI) X-ray microcomputed tomography (XCT). Compared to absorption contrast (AC), TLGI-XCT provides enhanced contrast between polymer matrix and carbon fibers at lower spatial resolutions in the form of differential phase contrast (DPC) and dark-field contrast (DFC). Consequently, relatively thin layers of resin, effectively indiscernible from image noise in AC data, are distinguishable. In addition to the assessment of fiber orientation, the combination of DPC and DFC facilitates the quantification of resin-rich areas, e.g., in gaps between fiber layers or at binder yarn collimation sites. We found that resin-rich areas between fiber layers are predominantly developed in regions characterized by a pronounced curvature. In contrast, in-layer resin-rich areas are mainly caused by the collimation of fibers by binder yarn. Furthermore, void volume around two adjacent 90°-oriented fiber layers is increased by roughly 20\% compared to a random distribution over the whole specimen.},
  language  = {en}
}