@article{SchlottmannSchickeKruegeretal.2019, author = {Schlottmann, Elisabeth and Schicke, David and Kr{\"u}ger, Felix and Lingnau, Benjamin and Schneider, Christian and H{\"o}fling, Sven and L{\"u}dge, Kathy and Porte, Xavier and Reitzenstein, Stephan}, title = {Stochastic polarization switching induced by optical injection in bimodal quantum-dot micropillar lasers}, series = {Optics Express}, volume = {27}, journal = {Optics Express}, number = {20}, doi = {10.1364/OE.27.028816}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-228603}, pages = {28816-28831}, year = {2019}, abstract = {Mutual coupling and injection locking of semiconductor lasers is of great interest in non-linear dynamics and its applications for instance in secure data communication and photonic reservoir computing. Despite its importance, it has hardly been studied in microlasers operating at mu W light levels. In this context, vertically emitting quantum dot micropillar lasers are of high interest. Usually, their light emission is bimodal, and the gain competition of the associated linearly polarized fundamental emission modes results in complex switching dynamics. We report on selective optical injection into either one of the two fundamental mode components of a bimodal micropillar laser. Both modes can lock to the master laser and influence the non-injected mode by reducing the available gain. We demonstrate that the switching dynamics can be tailored externally via optical injection in very good agreement with our theory based on semi-classical rate equations. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement}, language = {en} } @article{AkshatAaboudAadetal.2019, author = {Akshat, Puri and Aaboud, M. and Aad, G. and Abbott, B. and Abdinov, O. and Abeloos, B. and Abhayasinghe, D. K. and Abidi, S. H. and Abou Zeid, O. S. and Abraham, N. L. and Abramowicz, H. and Abreu, H. and Abulaiti, Y. and Acharya, B. S. and Adachi, S. and Adam, L. and Adamczyk, L. and Adelman, J. and Adersberger, M. and Adiguzel, A. and Adye, T. and Affolder, A. A. and Afik, Y. and Agheorghiesei, C. and Aguilar-Saavedra, J. A. and Ahmadov, F. and Aiellil, G. and Akatsuka, S. and Akesson, T. P. A. and Akilli, E. and Akimov, A. V. and Alberghi, G. L. and Albert, J. and Albicocco, P. and Alconada Verzini, M. J. and Alderweireld, S. and Aleksa, M. and Aleksandrov, I. N. and Alexa, C. and Alexopoulos, T. and Alhroob, M. and Ali, B. and Alimonti, G. and Alison, J. and Andre, S. P. and Allaire, C. and Allbrooke, B. M. M. and Allen, B. W. and Allport, P. P. and Aloisio, A. and Alonso, A. and Alonso, F. and Alpigiani, C. and Alshehri, A. A. and Alstaty, M. I. and Alvarez, Gonzalez B. and Alvarez Piqueras, D. and Alviggi, M. G. and Amadio, B. T. and Amaral, Coutinho, Y. and Ambler, A. and Ambroz, L. and Amelung, C. and Amidei, D. and Amor Dos Santos, S. P. and Amoroso, S. and Amrouche, C. S. and Anastopoulos, C. and Ancu, L. S. and Andari, N. and Andeen, T. and Anders, C. F. and Anders, J. K. and Anderson, K. J. and Andreazza, A. and Andrei, V. and et al,}, title = {Measurement of angular and momentum distributions of charged particles within and around jets in Pb plus Pb and pp collisions at root s(NN)=5.02 TeV with ATLAS at the LHC : XXVIIth International Conference on Ultrarelativistic Nucleus-Nucleus Collisions (Quark Matter 2018)}, series = {Nuclear Physics A}, volume = {982}, journal = {Nuclear Physics A}, number = {2}, doi = {10.1016/j.nuclphysa.2018.09.021}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-224703}, pages = {177-179}, year = {2019}, abstract = {Studies of the fragmentation of jets into charged particles in heavy-ion collisions can help in understanding the mechanism of jet quenching by the hot and dense QCD matter created in such collisions, the quark-gluon plasma. These proceedings present a measurement of the angular distribution of charged particles around the jet axis in root s(NN) = 5.02 TeV Pb+Pb and pp collisions, done using the ATLAS detector at the LHC. The measurement is performed inside jets reconstructed with the anti-k(t) algorithm with radius parameter R = 0.4, and is extended to regions outside the jet cone. Results are presented as a function of Pb+Pb collision centrality, and both jet and charged-particle transverse momenta.}, language = {en} } @article{OPUS4-31955, title = {Search for light resonances decaying to boosted quark pairs and produced in association with a photon or a jet in proton-proton collisions at root s=13 TeV with the ATLAS detector}, series = {Physics Letters B}, volume = {788}, journal = {Physics Letters B}, organization = {The ATLAS Collaboration}, doi = {10.1016/j.physletb.2018.09.062}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-319552}, pages = {316-335}, year = {2019}, abstract = {This Letter presents a search for new light resonances decaying to pairs of quarks and produced in association with a high-p(T) photon or jet. The dataset consists of proton-proton collisions with an integrated luminosity of 36.1 fb(-1) at a centre-of-mass energy of root s = 13 TeV recorded by the ATLAS detector at the Large Hadron Collider. Resonance candidates are identified as massive large-radius jets with substructure consistent with a particle decaying into a quark pair. The mass spectrum of the candidates is examined for local excesses above background. No evidence of a new resonance is observed in the data, which are used to exclude the production of a lepto-phobic axial-vector Z' boson. (C) 2018 The Author(s). Published by Elsevier B.V.}, language = {en} } @article{RadchukRajivPotokinaetal.2019, author = {Radchuk, Volodymyr and Rajiv, Sharma and Potokina, Elena and Radchuk, Ruslana and Weier, Diana and Munz, Eberhard and Schreiber, Miriam and Mascher, Martin and Stein, Nils and Wicker, Thomas and Kilian, Benjamin and Borisjuk, Ljudmilla}, title = {The highly divergent \(Jekyll\) genes, required for sexual reproduction, are lineage specific for the related grass tribes Triticeae and Bromeae}, series = {Plant Journal}, volume = {98}, journal = {Plant Journal}, number = {6}, doi = {10.1111/tpj.14363}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-224769}, pages = {961-974}, year = {2019}, abstract = {Phylogenetically related groups of species contain lineage-specific genes that exhibit no sequence similarity to any genes outside the lineage. We describe here that the Jekyll gene, required for sexual reproduction, exists in two much diverged allelic variants, Jek1 and Jek3. Despite low similarity, the Jek1 and Jek3 proteins share identical signal peptides, conserved cysteine positions and direct repeats. The Jek1/Jek3 sequences are located at the same chromosomal locus and inherited in a monogenic Mendelian fashion. Jek3 has a similar expression as Jek1 and complements the Jek1 function in Jek1-deficient plants. Jek1 and Jek3 allelic variants were almost equally distributed in a collection of 485 wild and domesticated barley accessions. All domesticated barleys harboring the Jek1 allele belong to single haplotype J1-H1 indicating a genetic bottleneck during domestication. Domesticated barleys harboring the Jek3 allele consisted of three haplotypes. Jekyll-like sequences were found only in species of the closely related tribes Bromeae and Triticeae but not in other Poaceae. Non-invasive magnetic resonance imaging revealed intrinsic grain structure in Triticeae and Bromeae, associated with the Jekyll function. The emergence of Jekyll suggests its role in the separation of the Bromeae and Triticeae lineages within the Poaceae and identifies the Jekyll genes as lineage-specific.}, language = {en} } @article{VogelMarkertRueckertetal.2019, author = {Vogel, Patrick and Markert, Jonathan and R{\"u}ckert, Martin A. and Herz, Stefan and Keßler, Benedikt and Dremel, Kilian and Althoff, Daniel and Weber, Matthias and Buzug, Thorsten M. and Bley, Thorsten A. and Kullmann, Walter H. and Hanke, Randolf and Zabler, Simon and Behr, Volker C.}, title = {Magnetic Particle Imaging meets computed tomography: first simultaneous imaging}, series = {Scientific Reports}, volume = {9}, journal = {Scientific Reports}, doi = {10.1038/s41598-019-48960-1}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-202501}, pages = {12627}, year = {2019}, abstract = {Magnetic Particle Imaging (MPI) is a promising new tomographic modality for fast as well as three-dimensional visualization of magnetic material. For anatomical or structural information an additional imaging modality such as computed tomography (CT) is required. In this paper, the first hybrid MPI-CT scanner for multimodal imaging providing simultaneous data acquisition is presented.}, language = {en} } @article{HattoriMichailSchmiedeletal.2019, author = {Hattori, Yohei and Michail, Evripidis and Schmiedel, Alexander and Moos, Michael and Holzapfel, Marco and Krummenacher, Ivo and Braunschweig, Holger and M{\"u}ller, Ulrich and Pflaum, Jens and Lambert, Christoph}, title = {Luminescent Mono-, Di-, and Tri-radicals: Bridging Polychlorinated Triarylmethyl Radicals by Triarylamines and Triarylboranes}, series = {Chemistry - A European Journal}, volume = {25}, journal = {Chemistry - A European Journal}, number = {68}, doi = {10.1002/chem.201903007}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-208162}, pages = {15463-15471}, year = {2019}, abstract = {Up to three polychlorinated pyridyldiphenylmethyl radicals bridged by a triphenylamine carrying electron withdrawing (CN), neutral (Me), or donating (OMe) groups were synthesized and analogous radicals bridged by tris(2,6-dimethylphenyl)borane were prepared for comparison. All compounds were as stable as common closed-shell organic compounds and showed significant fluorescence upon excitation. Electronic, magnetic, absorption, and emission properties were examined in detail, and experimental results were interpreted using DFT calculations. Oxidation potentials, absorption and emission energies could be tuned depending on the electron density of the bridges. The triphenylamine bridges mediated intramolecular weak antiferromagnetic interactions between the radical spins, and the energy difference between the high spin and low spin states was determined by temperature dependent ESR spectroscopy and DFT calculations. The fluorescent properties of all radicals were examined in detail and revealed no difference for high and low spin states which facilitates application of these dyes in two-photon absorption spectroscopy and OLED devices.}, language = {en} } @article{WinterAndelovicKampfetal.2019, author = {Winter, Patrick and Andelovic, Kristina and Kampf, Thomas and Gutjahr, Fabian Tobias and Heidenreich, Julius and Zernecke, Alma and Bauer, Wolfgang Rudolf and Jakob, Peter Michael and Herold, Volker}, title = {Fast self-navigated wall shear stress measurements in the murine aortic archusing radial 4D-phase contrast cardiovascular magnetic resonance at 17.6 T}, series = {Journal of Cardiovascular Magnetic Resonance}, volume = {21}, journal = {Journal of Cardiovascular Magnetic Resonance}, doi = {10.1186/s12968-019-0566-z}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-201120}, pages = {64}, year = {2019}, abstract = {Purpose 4D flow cardiovascular magnetic resonance (CMR) and the assessment of wall shear stress (WSS) are non-invasive tools to study cardiovascular risks in vivo. Major limitations of conventional triggered methods are the long measurement times needed for high-resolution data sets and the necessity of stable electrocardiographic (ECG) triggering. In this work an ECG-free retrospectively synchronized method is presented that enables accelerated high-resolution measurements of 4D flow and WSS in the aortic arch of mice. Methods 4D flow and WSS were measured in the aortic arch of 12-week-old wildtype C57BL/6 J mice (n = 7) with a radial 4D-phase-contrast (PC)-CMR sequence, which was validated in a flow phantom. Cardiac and respiratory motion signals were extracted from the radial CMR signal and were used for the reconstruction of 4D-flow data. Rigid motion correction and a first order B0 correction was used to improve the robustness of magnitude and velocity data. The aortic lumen was segmented semi-automatically. Temporally averaged and time-resolved WSS and oscillatory shear index (OSI) were calculated from the spatial velocity gradients at the lumen surface at 14 locations along the aortic arch. Reproducibility was tested in 3 animals and the influence of subsampling was investigated. Results Volume flow, cross-sectional areas, WSS and the OSI were determined in a measurement time of only 32 min. Longitudinal and circumferential WSS and radial stress were assessed at 14 analysis planes along the aortic arch. The average longitudinal, circumferential and radial stress values were 1.52 ± 0.29 N/m2, 0.28 ± 0.24 N/m2 and - 0.21 ± 0.19 N/m2, respectively. Good reproducibility of WSS values was observed. Conclusion This work presents a robust measurement of 4D flow and WSS in mice without the need of ECG trigger signals. The retrospective approach provides fast flow quantification within 35 min and a flexible reconstruction framework.}, language = {en} } @article{HeroldKampfJakob2019, author = {Herold, Volker and Kampf, Thomas and Jakob, Peter Michael}, title = {Dynamic magnetic resonance scattering}, series = {Communications Physics}, volume = {2}, journal = {Communications Physics}, doi = {10.1038/s42005-019-0136-6}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-201091}, pages = {46}, year = {2019}, abstract = {Dynamic light scattering is a popular technique to determine the size distribution of small particles in the sub micrometer region. It operates in reciprocal space, by analyzing the signal fluctuations with the photon auto correlation function. Equally, pulsed field gradient magnetic resonance is a technique generating data in the reciprocal space of the density distribution of an object. Here we show the feasibility of employing a magnetic resonance imaging system as a dynamic scattering device similar to dynamic light scattering appliances. By acquiring a time series of single data points from reciprocal space, analogue to dynamic light scattering, we demonstrate the examination of motion patterns of microscopic particles. This method allows the examination of particle dynamics significantly below the spatial resolution of magnetic resonance imaging. It is not limited by relaxation times and covers a wide field of applications for particle or cell motion in opaque media.}, language = {en} } @article{OPUS4-31736, title = {Search for heavy particles decaying into a top-quark pair in the fully hadronic final state in \({pp}\) collisions at root s=13 TeV with the ATLAS detector}, series = {Physical Review D}, volume = {99}, journal = {Physical Review D}, number = {9}, organization = {The ATLAS Collaboration}, doi = {10.1103/PhysRevD.99.092004}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-317362}, pages = {1-38}, year = {2019}, abstract = {A search for new particles decaying into a pair of top quarks is performed using proton-proton collision data recorded with the ATLAS detector at the Large Hadron Collider at a center-of-mass energy of root s = 13 TeV corresponding to an integrated luminosity of 36.1 fb(-1). Events consistent with top-quark pair production and the fully hadronic decay mode of the top quarks are selected by requiring multiple high transverse momentum jets including those containing b-hadrons. Two analysis techniques, exploiting dedicated top-quark pair reconstruction in different kinematic regimes, are used to optimize the search sensitivity to new hypothetical particles over a wide mass range. The invariant mass distribution of the two reconstructed top-quark candidates is examined for resonant production of new particles with various spins and decay widths. No significant deviation from the Standard Model prediction is observed and limits are set on the production cross-section times branching fraction for new hypothetical Z' bosons, dark-matter mediators, Kaluza-Klein gravitons and Kaluza-Klein gluons. By comparing with the predicted production cross sections, the Z' boson in the topcolor-assisted-technicolor model is excluded for masses up to 3.1-3.6 TeV, the dark-matter mediators in a simplified framework are excluded in the mass ranges from 0.8 to 0.9 TeV and from 2.0 to 2.2 TeV, and the Kaluza-Klein gluon is excluded for masses up to 3.4 TeV, depending on the decay widths of the particles.}, language = {en} } @article{OPUS4-22686, title = {Resolution of the ATLAS muon spectrometer monitored drift tubes in LHC Run 2}, series = {Journal of Instrumentation}, volume = {14}, journal = {Journal of Instrumentation}, organization = {The ATLAS Collaboration}, doi = {10.1088/1748-0221/14/09/P09011}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-226869}, pages = {1-34}, year = {2019}, abstract = {The momentum measurement capability of the ATLAS muon spectrometer relies fundamentally on the intrinsic single-hit spatial resolution of the monitored drift tube precision tracking chambers. Optimal resolution is achieved with a dedicated calibration program that addresses the specific operating conditions of the 354 000 high-pressure drift tubes in the spectrometer. The calibrations consist of a set of timing offsets and drift time to drift distance transfer relations, and result in chamber resolution functions. This paper describes novel algorithms to obtain precision calibrations from data collected by ATLAS in LHC Run 2 and from a gas monitoring chamber, deployed in a dedicated gas facility. The algorithm output consists of a pair of correction constants per chamber which are applied to baseline calibrations, and determined to be valid for the entire ATLAS Run 2. The final single-hit spatial resolution, averaged over 1172 monitored drift tube chambers, is 81.7 +/- 2.2 mu m.}, language = {en} } @article{OPUS4-22684, title = {Search for high-mass dilepton resonances using 139 fb\(^{-1}\) of \(pp\) collision data collected at root \(s\)=13 TeV with the ATLAS detector}, series = {Physics Letters B}, volume = {796}, journal = {Physics Letters B}, organization = {The ATLAS Collaboration}, doi = {10.1016/j.physletb.2019.07.016}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-226844}, pages = {68-87}, year = {2019}, abstract = {A search for high-mass dielectron and dimuon resonances in the mass range of 250 GeV to 6TeV is presented. The data were recorded by the ATLAS experiment in proton-proton collisions at a centre-ofmass energy of root s = 13 TeV during Run 2 of the Large Hadron Collider and correspond to an integrated luminosity of 139 fb(-1). A functional form is fitted to the dilepton invariant-mass distribution to model the contribution from background processes, and a generic signal shape is used to determine the significance of observed deviations from this background estimate. No significant deviation is observed and upper limits are placed at the 95\% confidence level on the fiducial cross-section times branching ratio for various resonance width hypotheses. The derived limits are shown to be applicable to spin-0, spin-1 and spin-2 signal hypotheses. For a set of benchmark models, the limits are converted into lower limits on the resonance mass and reach 4.5 TeV for the E-6-motivated Z(psi)' boson. Also presented are limits on Heavy Vector Triplet model couplings. (C) 2019 The Author. Published by Elsevier B.V.}, language = {en} } @article{OPUS4-22687, title = {Search for electroweak diboson production in association with a high-mass dijet system in semileptonic final states in \(pp\) collisions at √\(s\) =13 TeV with the ATLAS detector}, series = {Physical Review D}, volume = {100}, journal = {Physical Review D}, organization = {The ATLAS Collaboration}, doi = {10.1103/PhysRevD.100.032007}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-226877}, pages = {36}, year = {2019}, abstract = {This paper reports on a search for electroweak diboson (WW/WZ/ZZ) production in association with a high-mass dijet system, using data from proton-proton collisions at a center-of-mass energy of N root s = 13 TeV. The data, corresponding to an integrated luminosity of 35.5 fb(-1), were recorded with the ATLAS detector in 2015 and 2016 at the Large Hadron Collider. The search is performed in final states in which one boson decays leptonically, and the other boson decays hadronically. The hadronically decaying W/Z boson is reconstructed as either two small-radius jets or one large-radius jet using jet substructure techniques. The electroweak production of WW/WZ/ZZ in association with two jets is measured with an observed (expected) significance of 2.7 (2.5) standard deviations, and the fiducial cross section is measured to be 45.1 +/- 8.6(stat.)(-14.6)(+15.9)(syst.) fb.}, language = {en} } @article{OPUS4-22683, title = {Search for a heavy charged boson in events with a charged lepton and missing transverse momentum from \(pp\) collisions at √\(s\)=13 TeV with the ATLAS detector}, series = {Physical Review D}, volume = {100}, journal = {Physical Review D}, organization = {The ATLAS Collaboration}, doi = {10.1103/PhysRevD.100.052013}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-226835}, pages = {1-29}, year = {2019}, abstract = {A search for a heavy charged-boson resonance decaying into a charged lepton (electron or muon) and a neutrino is reported. A data sample of 139 fb(-1) of proton-proton collisions at root s = 13 TeV collected with the ATLAS detector at the LHC during 2015-2018 is used in the search. The observed transverse mass distribution computed from the lepton and missing transverse momenta is consistent with the distribution expected from the Standard Model, and upper limits on the cross section for pp -> W'-> lv are extracted (l = e or mu). These vary between 1.3 pb and 0.05 tb depending on the resonance mass in the range between 0.15 and 7.0 TeV at 95\% confidence level for the electron and muon channels combined. Gauge bosons with a mass below 6.0 and 5.1 TeV are excluded in the electron and muon channels, respectively, in a model with a resonance that has couplings to fermions identical to those of the Standard Model W boson. Cross-section limits are also provided for resonances with several fixed Gamma/m values in the range between 1\% and 15\%. Model-independent limits are derived in single-bin signal regions defined by a varying minimum transverse mass threshold. The resulting visible cross-section upper limits range between 4.6 (15) ph and 22 (22) ab as the threshold increases from 130 (110) GeV to 5.1 (5.1) TeV in the electron (muon) channel.}, language = {en} } @article{OPUS4-22688, title = {Measurement of distributions sensitive to the underlying event in inclusive Z boson production in \(pp\) collisions at √\(s\)=13 TeV with the ATLAS detector}, series = {European Physical Journal C}, volume = {79}, journal = {European Physical Journal C}, number = {666}, organization = {The ATLAS Collaboration}, doi = {10.1140/epjc/s10052-019-7162-0}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-226883}, pages = {1-31}, year = {2019}, abstract = {This paper presents measurements of charged-particle distributions sensitive to the properties of the underlying event in events containing a Z boson decaying into a muon pair. The data were obtained using the ATLAS detector at the LHC in proton-proton collisions at a centre-of-mass energy of 13 TeV with an integrated luminosity of 3.2 fb(-1). Distributions of the charged-particle multiplicity and of the charged-particle transverse momentum are measured in regions of the azimuth defined relative to the Z boson direction. The measured distributions are compared with the predictions of various Monte Carlo generators which implement different underyling event models. The Monte Carlo model predictions qualitatively describe the data well, but with some significant discrepancies.}, language = {en} } @article{OPUS4-22685, title = {Measurement of the cross-section and charge asymmetry of W bosons produced in proton-proton collisions at √\(s\)=8 TeV with the ATLAS detector}, series = {European Physical Journal C}, volume = {79}, journal = {European Physical Journal C}, number = {760}, organization = {The ATLAS Collaboration}, doi = {10.1140/epjc/s10052-019-7199-0}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-226850}, pages = {1-25}, year = {2019}, abstract = {This paper presents measurements of the W+->mu+nu and W-->mu-nu cross-sections and the associated charge asymmetry as a function of the absolute pseudorapidity of the decay muon. The data were collected in proton-proton collisions at a centre-of-mass energy of 8 TeV with the ATLAS experiment at the LHC and correspond to a total integrated luminosity of 20.2fb(-1). The precision of the cross-section measurements varies between 0.8 and 1.5\% as a function of the pseudorapidity, excluding the 1.9\% uncertainty on the integrated luminosity. The charge asymmetry is measured with an uncertainty between 0.002 and 0.003. The results are compared with predictions based on next-to-next-to-leading-order calculations with various parton distribution functions and have the sensitivity to discriminate between them.}, language = {en} } @article{OPUS4-22689, title = {Observation of Light-by-Light Scattering in Ultraperipheral Pb + Pb Collisions with the ATLAS Detector}, series = {Physical Review Letters}, volume = {123}, journal = {Physical Review Letters}, organization = {The ATLAS Collaboration}, doi = {10.1103/PhysRevLett.123.052001}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-226892}, pages = {1-21}, year = {2019}, abstract = {This Letter describes the observation of the light-by-light scattering process, gamma gamma -> gamma gamma, in Pb + Pb collisions at root S-NN = 5.02 TeV. The analysis is conducted using a data sample corresponding to an integrated luminosity of 1.73 nb(-1), collected in November 2018 by the ATLAS experiment at the LHC. Light-by-light scattering candidates are selected in events with two photons produced exclusively, each with transverse energy E-T(gamma) > 3 GeV and pseudorapidity vertical bar eta(gamma)vertical bar < 2.4, diphoton invariant mass above 6 GeV, and small diphoton transverse momentum and acoplanarity. After applying all selection criteria, 59 candidate events are observed for a background expectation of 12 +/- 3 events. The observed excess of events over the expected background has a significance of 8.2 standard deviations. The measured fiducial cross section is 78 +/- 13(stat) +/- 7(syst) +/- 3(lumi) nb.}, language = {en} } @article{OPUS4-22681, title = {Identification of boosted Higgs bosons decaying into \(b\)-quark pairs with the ATLAS detector at 13 TeV}, series = {European Physical Journal C}, volume = {79}, journal = {European Physical Journal C}, number = {836}, organization = {The ATLAS Collaboration}, doi = {10.1140/epjc/s10052-019-7335-x}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-226812}, pages = {1-38}, year = {2019}, abstract = {This paper describes a study of techniques for identifying Higgs bosons at high transverse momenta decaying into bottom-quark pairs, H -> b (b) over bar, for proton-proton collision data collected by the ATLAS detector at the Large Hadron Collider at a centre-of-mass energy root s = 13 TeV. These decays are reconstructed from calorimeter jets found with the anti-k(t) R = 1.0 jet algorithm. To tag Higgs bosons, a combination of requirements is used: b-tagging of R = 0.2 track-jets matched to the large-R calorimeter jet, and requirements on the jet mass and other jet substructure variables. The Higgs boson tagging efficiency and corresponding multijet and hadronic top-quark background rejections are evaluated using Monte Carlo simulation. Several benchmark tagging selections are defined for different signal efficiency targets. The modelling of the relevant input distributions used to tag Higgs bosons is studied in 36 fb(-1) of data collected in 2015 and 2016 using g -> b (b) over bar and Z(-> b (b) over bar)gamma event selections in data. Both processes are found to be well modelled within the statistical and systematic uncertainties.}, language = {en} } @article{OPUS4-22682, title = {Measurement of the inclusive cross-section for the production of jets in association with a \(Z\) boson in proton-proton collisions at 8 TeV using the ATLAS detector}, series = {European Physical Journal C}, volume = {79}, journal = {European Physical Journal C}, number = {847}, organization = {The ATLAS Collaboration}, doi = {10.1140/epjc/s10052-019-7321-3}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-226821}, pages = {1-47}, year = {2019}, abstract = {The inclusive cross-section for jet production in association with a Z boson decaying into an electronpositron pair is measured as a function of the transverse momentum and the absolute rapidity of jets using 19.9 fb(-1) of root s = 8 TeV proton-proton collision data collected with the ATLAS detector at the Large Hadron Collider. The measured Z + jets cross-section is unfolded to the particle level. The cross-section is compared with state-of-the-art Standard Model calculations, including the next-to-leading-order and next-to-next-to-leading-order perturbative QCD calculations, corrected for non-perturbative and QED radiation effects. The results of the measurements cover final-state jets with transverse momenta up to 1 TeV, and show good agreement with fixed-order calculations.}, language = {en} } @article{OPUS4-22690, title = {Search for diboson resonances in hadronic final states in 139 fb\(^{-1}\) of \(pp\) collisions at √\(s\)=13 TeV with the ATLAS detector}, series = {Journal of High Energy Physics}, volume = {09}, journal = {Journal of High Energy Physics}, number = {91}, organization = {The ATLAS Collaboration}, doi = {10.1007/JHEP09(2019)091}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-226905}, pages = {1-42}, year = {2019}, abstract = {Narrow resonances decaying into WW, WZ or ZZ boson pairs are searched for in 139 fb(-1) of proton-proton collision data at a centre-of-mass energy of root s = 13TeV recorded with the ATLAS detector at the Large Hadron Collider from 2015 to 2018. The diboson system is reconstructed using pairs of high transverse momentum, large-radius jets. These jets are built from a combination of calorimeter- and tracker-inputs compatible with the hadronic decay of a boosted W or Z boson, using jet mass and substructure properties. The search is performed for diboson resonances with masses greater than 1.3TeV. No significant deviations from the background expectations are observed. Exclusion limits at the 95\% confidence level are set on the production cross-section times branching ratio into dibosons for resonances in a range of theories beyond the Standard Model, with the highest excluded mass of a new gauge boson at 3.8TeV in the context of mass-degenerate resonances that couple predominantly to gauge bosons.}, language = {en} } @article{OPUS4-22691, title = {FCC-hh: The Hadron Collider: Future Circular Collider Conceptual Design Report Volume 3}, series = {European Physical Journal - Special Topics}, volume = {228}, journal = {European Physical Journal - Special Topics}, organization = {The FCC Collaboration}, doi = {10.1140/epjst/e2019-900087-0}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-226917}, pages = {755-1107}, year = {2019}, abstract = {In response to the 2013 Update of the European Strategy for Particle Physics (EPPSU), the Future Circular Collider (FCC) study was launched as a world-wide international collaboration hosted by CERN. The FCC study covered an energy-frontier hadron collider (FCC-hh), a highest-luminosity high-energy lepton collider (FCC-ee), the corresponding 100km tunnel infrastructure, as well as the physics opportunities of these two colliders, and a high-energy LHC, based on FCC-hh technology. This document constitutes the third volume of the FCC Conceptual Design Report, devoted to the hadron collider FCC-hh. It summarizes the FCC-hh physics discovery opportunities, presents the FCC-hh accelerator design, performance reach, and staged operation plan, discusses the underlying technologies, the civil engineering and technical infrastructure, and also sketches a possible implementation. Combining ingredients from the Large Hadron Collider (LHC), the high-luminosity LHC upgrade and adding novel technologies and approaches, the FCC-hh design aims at significantly extending the energy frontier to 100TeV. Its unprecedented centre of-mass collision energy will make the FCC-hh a unique instrument to explore physics beyond the Standard Model, offering great direct sensitivity to new physics and discoveries.}, language = {en} } @article{OPUS4-22692, title = {HE-LHC: The High-Energy Large Hadron Collider : Future Circular Collider Conceptual Design Report Volume 4}, series = {European Physical Journal - Special Topics}, volume = {228}, journal = {European Physical Journal - Special Topics}, number = {5}, organization = {The FCC Collaboration}, doi = {10.1140/epjst/e2019-900088-6}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-226928}, pages = {1109-1382}, year = {2019}, abstract = {In response to the 2013 Update of the European Strategy for Particle Physics (EPPSU), the Future Circular Collider (FCC) study was launched as a world-wide international collaboration hosted by CERN. The FCC study covered an energy-frontier hadron collider (FCC-hh), a highest-luminosity high-energy lepton collider (FCC-ee), the corresponding 100 km tunnel infrastructure, as well as the physics opportunities of these two colliders, and a high-energy LHC, based on FCC-hh technology. This document constitutes the third volume of the FCC Conceptual Design Report, devoted to the hadron collider FCC-hh. It summarizes the FCC-hh physics discovery opportunities, presents the FCC-hh accelerator design, performance reach, and staged operation plan, discusses the underlying technologies, the civil engineering and technical infrastructure, and also sketches a possible implementation. Combining ingredients from the Large Hadron Collider (LHC), the high-luminosity LHC upgrade and adding novel technologies and approaches, the FCC-hh design aims at significantly extending the energy frontier to 100 TeV. Its unprecedented centre-of-mass collision energy will make the FCC-hh a unique instrument to explore physics beyond the Standard Model, offering great direct sensitivity to new physics and discoveries.}, language = {en} } @article{OPUS4-22693, title = {FCC Physics Opportunities: Future Circular Collider Conceptual Design Report Volume 1}, series = {European Physical Journal C}, volume = {79}, journal = {European Physical Journal C}, number = {474}, organization = {The FCC Collaboration}, doi = {10.1140/epjc/s10052-019-6904-3}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-226938}, pages = {1-161}, year = {2019}, abstract = {We review the physics opportunities of the Future Circular Collider, covering its e(+)e(-), pp, ep and heavy ion programmes. We describe the measurement capabilities of each FCC component, addressing the study of electroweak, Higgs and strong interactions, the top quark and flavour, as well as phenomena beyond the Standard Model. We highlight the synergy and complementarity of the different colliders, which will contribute to a uniquely coherent and ambitious research programme, providing an unmatchable combination of precision and sensitivity to new physics.}, language = {en} } @article{OPUS4-22694, title = {FCC-ee: The Lepton Collider: Future Circular Collider Conceptual Design Report Volume 2}, series = {European Physical Journal - Special Topics}, volume = {228}, journal = {European Physical Journal - Special Topics}, number = {2}, organization = {The FCC Collaboration}, doi = {10.1140/epjst/e2019-900045-4}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-226947}, pages = {261-623}, year = {2019}, abstract = {In response to the 2013 Update of the European Strategy for Particle Physics, the Future Circular Collider (FCC) study was launched, as an international collaboration hosted by CERN. This study covers a highest-luminosity high-energy lepton collider (FCC-ee) and an energy-frontier hadron collider (FCC-hh), which could, successively, be installed in the same 100 km tunnel. The scientific capabilities of the integrated FCC programme would serve the worldwide community throughout the 21st century. The FCC study also investigates an LHC energy upgrade, using FCC-hh technology. This document constitutes the second volume of the FCC Conceptual Design Report, devoted to the electron-positron collider FCC-ee. After summarizing the physics discovery opportunities, it presents the accelerator design, performance reach, a staged operation scenario, the underlying technologies, civil engineering, technical infrastructure, and an implementation plan. FCC-ee can be built with today's technology. Most of the FCC-ee infrastructure could be reused for FCC-hh. Combining concepts from past and present lepton colliders and adding a few novel elements, the FCC-ee design promises outstandingly high luminosity. This will make the FCC-ee a unique precision instrument to study the heaviest known particles (Z, W and H bosons and the top quark), offering great direct and indirect sensitivity to new physics.}, language = {en} } @article{OPUS4-36018, title = {Search for Multimessenger Sources of Gravitational Waves and High-energy Neutrinos with Advanced LIGO during Its First Observing Run, ANTARES, and IceCube}, series = {The Astrophysical Journal}, volume = {870}, journal = {The Astrophysical Journal}, number = {2}, publisher = {The American Astronomical Society}, organization = {The LIGO Scientific Collaboration and the Virgo Collaboration}, doi = {10.3847/1538-4357/aaf21d}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-360189}, pages = {1-16}, year = {2019}, abstract = {Astrophysical sources of gravitational waves, such as binary neutron star and black hole mergers or core-collapse supernovae, can drive relativistic outflows, giving rise to non-thermal high-energy emission. High-energy neutrinos are signatures of such outflows. The detection of gravitational waves and high-energy neutrinos from common sources could help establish the connection between the dynamics of the progenitor and the properties of the outflow. We searched for associated emission of gravitational waves and high-energy neutrinos from astrophysical transients with minimal assumptions using data from Advanced LIGO from its first observing run O1, and data from the Antares and IceCube neutrino observatories from the same time period. We focused on candidate events whose astrophysical origins could not be determined from a single messenger. We found no significant coincident candidate, which we used to constrain the rate density of astrophysical sources dependent on their gravitational-wave and neutrino emission processes.}, language = {en} }