Cross-wind vibrations of a new steel chimney 100
m high caused twice damage of bolts. Measured damping properties of the chimney permitted to compare different approaches to the calculation of ...relative amplitude of vibration at small Scruton number. Climatic conditions during vibrations also gave important conclusions. Results of analysis are instructive for National Annex to the Eurocode 1.
This paper deals with the main features of some wind loading provisions in Central and Eastern Europe from the end of the 19th century to present. They are design wind speeds, terrain categories and ...wind profiles, and gust response factors. Early assumptions and provisions as well as their changes throughout the last century are presented. In this context the influence of Davenport's ideas and works on those provisions are pointed out.
Results are reported from a search for physics beyond the standard model in final states with at least three charged leptons, in any combination of electrons or muons. The data sample corresponds to ...an integrated luminosity of 2.3fb-1 of proton–proton collisions at s=13TeV, recorded by the CMS experiment at the LHC in 2015. Two jets are required in each event, providing good sensitivity to strong production of gluinos and squarks. The search regions, sensitive to a range of different new physics scenarios, are defined using the number of jets tagged as originating from bottom quarks, the sum of the magnitudes of the transverse momenta of the jets, the imbalance in the overall transverse momentum in the event, and the invariant mass of opposite-sign, same-flavor lepton pairs. The event yields observed in data are consistent with the expected background contributions from standard model processes. These results are used to derive limits in terms of R-parity conserving simplified models of supersymmetry that describe strong production of gluinos and squarks. Model-independent limits are presented to facilitate the reinterpretation of the results in a broad range of scenarios for physics beyond the standard model.
Abstract The cross section for Higgs boson production in pp collisions is studied using the H arrow right W+W- decay mode, followed by leptonic decays of the W bosons to an oppositely charged ...electron-muon pair in the final state. The measurements are performed using data collected by the CMS experiment at the LHC at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.4 fb -1. The Higgs boson transverse momentum (p T) is reconstructed using the lepton pair p T and missing p T. The differential cross section times branching fraction is measured as a function of the Higgs boson p T in a fiducial phase space defined to match the experimental acceptance in terms of the lepton kinematics and event topology. The production cross section times branching fraction in the fiducial phase space is measured to be 39 ± 8 (stat) ± 9 (syst) fb. The measurements are found to agree, within experimental uncertainties, with theoretical calculations based on the standard model. Figure not available: see fulltext.
A search for new phenomena is performed in final states containing one or more jets and an imbalance in transverse momentum in pp collisions at a centre-of-mass energy of 13TeV. The analysed data ...sample, recorded with the CMS detector at the CERN LHC, corresponds to an integrated luminosity of 2.3fb-1. Several kinematic variables are employed to suppress the dominant background, multijet production, as well as to discriminate between other standard model and new physics processes. The search provides sensitivity to a broad range of new-physics models that yield a stable weakly interacting massive particle. The number of observed candidate events is found to agree with the expected contributions from standard model processes, and the result is interpreted in the mass parameter space of fourteen simplified supersymmetric models that assume the pair production of gluinos or squarks and a range of decay modes. For models that assume gluino pair production, masses up to 1575 and 975GeV are excluded for gluinos and neutralinos, respectively. For models involving the pair production of top squarks and compressed mass spectra, top squark masses up to 400GeV are excluded.
The nuclear modification factor RAA and the azimuthal anisotropy coefficient v2 of prompt and nonprompt (i.e. those from decays of b hadrons) J/ψ mesons, measured from PbPb and pp collisions at ...sNN=2.76TeV at the LHC, are reported. The results are presented in several event centrality intervals and several kinematic regions, for transverse momenta pT>6.5GeV/c and rapidity |y|<2.4, extending down to pT=3GeV/c in the 1.6<|y|<2.4 range. The v2 of prompt J/ψ is found to be nonzero, but with no strong dependence on centrality, rapidity, or pT over the full kinematic range studied. The measured v2 of nonprompt J/ψ is consistent with zero. The RAA of prompt J/ψ exhibits a suppression that increases from peripheral to central collisions but does not vary strongly as a function of either y or pT in the fiducial range. The nonprompt J/ψRAA shows a suppression which becomes stronger as rapidity or pT increases. The v2 and RAA of open and hidden charm, and of open charm and beauty, are compared.
The nuclear modification factor Formula: see text and the azimuthal anisotropy coefficient Formula: see text of prompt and nonprompt (i.e. those from decays of b hadrons) Formula: see text mesons, ...measured from PbPb and pp collisions at Formula: see text Formula: see text at the LHC, are reported. The results are presented in several event centrality intervals and several kinematic regions, for transverse momenta Formula: see text Formula: see text and rapidity Formula: see text, extending down to Formula: see text Formula: see text in the Formula: see text range. The Formula: see text of prompt Formula: see text is found to be nonzero, but with no strong dependence on centrality, rapidity, or Formula: see text over the full kinematic range studied. The measured Formula: see text of nonprompt Formula: see text is consistent with zero. The Formula: see text of prompt Formula: see text exhibits a suppression that increases from peripheral to central collisions but does not vary strongly as a function of either
or Formula: see text in the fiducial range. The nonprompt Formula: see text Formula: see text shows a suppression which becomes stronger as rapidity or Formula: see text increases. The Formula: see text and Formula: see text of open and hidden charm, and of open charm and beauty, are compared.
A search for new phenomena is performed in final states containing one or more jets and an imbalance in transverse momentum in pp collisions at a centre-of-mass energy of 13Formula: see text. The ...analysed data sample, recorded with the CMS detector at the CERN LHC, corresponds to an integrated luminosity of 2.3Formula: see text. Several kinematic variables are employed to suppress the dominant background, multijet production, as well as to discriminate between other standard model and new physics processes. The search provides sensitivity to a broad range of new-physics models that yield a stable weakly interacting massive particle. The number of observed candidate events is found to agree with the expected contributions from standard model processes, and the result is interpreted in the mass parameter space of fourteen simplified supersymmetric models that assume the pair production of gluinos or squarks and a range of decay modes. For models that assume gluino pair production, masses up to 1575 and 975Formula: see text are excluded for gluinos and neutralinos, respectively. For models involving the pair production of top squarks and compressed mass spectra, top squark masses up to 400Formula: see text are excluded.
The WZ production cross section is measured by the CMS experiment at the CERN LHC in proton-proton collision data samples corresponding to integrated luminosities of 4.9Formula: see text collected at ...Formula: see text, and 19.6Formula: see text at Formula: see text. The measurements are performed using the fully-leptonic WZ decay modes with electrons and muons in the final state. The measured cross sections for Formula: see text are Formula: see text Formula: see text and Formula: see text Formula: see text. Differential cross sections with respect to the Formula: see text boson Formula: see text, the leading jet Formula: see text, and the number of jets are obtained using the Formula: see text data. The results are consistent with standard model predictions and constraints on anomalous triple gauge couplings are obtained.
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