761 research outputs found

    Ultrafast hot carrier driven magnetization dynamics

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    Chiral color symmetry and possible GG'-boson effects at the Tevatron and LHC

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    A gauge model with chiral color symmetry is considered and possible effects of the color GG'-boson octet predicted by this symmetry are investigated in dependence on two free parameters, the mixing angle θG\theta_G and GG' mass mGm_{G'}. The allowed region in the mGθGm_{G'} - \theta_G plane is found from the Tevatron data on the cross section σttˉ\sigma_{t\bar{t}} and forward-backward asymmetry AFBppˉA_{\rm FB}^{p \bar p} of the ttˉt\bar{t} production. The mass limits for the GG'-boson are shown to be stronger than those for the axigluon. A possible effect of the GG'-boson on the ttˉt\bar{t} production at the LHC is discussed and the mass limits providing for the GG'-boson evidence at the LHC are estimated in dependence on θG\theta_G.Comment: 11 pages, 2 figures, accepted for publication in Modern Physics Letters

    Probing a Nucleon Spin Structure at TESLA by the Real Polarized Gamma Beam

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    The recent proposals concerning the usage of the real polarized gamma beam, obtained by the Compton backscattering of the laser photons off the electron beams from either the linear or circular accelerators were considered. The heavy quark photoproduction process giving a unique opportunity to measure polarized gluon distribution was investigated.Comment: 16 pages, LATEX, 6 figures (EPS

    About actual contradiction in geotechnical design and optimal way of it resolution

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    The paper describes serious and fundamental contradiction in geotechnical design, which manifested itself to the greatest extent when designing the foundations of high-rise buildings in the third quarter of the 20th century has begun to form from the late of the 19th century to the 20th years of the 20th century. Prime cause of this contradiction is in complex physical structure of soils, complex nature of their formation and, therefore, in complex form of their deformation. The article also notes the high technical and economic efficiency of using realistic physically nonlinear soil models in the design of geotechnical parts of buildings and structures. In this case such a designing is most effective when using the parameters of nonlinear models determined from data of in-situ tests. © Published under licence by IOP Publishing Ltd

    PQCD Analysis of Parton-Hadron Duality

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    We propose an extraction of the running coupling constant of QCD in the infrared region from experimental data on deep inelastic inclusive scattering at Bjorken x -> 1. We first attempt a perturbative fit of the data that extends NLO PQCD evolution to large x values and final state invariant mass, W, in the resonance region. We include both target mass corrections and large x resummation effects. These effects are of order O(1/Q^2), and they improve the agreement with the Q^2 dependence of the data. Standard analyses require the presence of additional power corrections, or dynamical higher twists, to achieve a fully quantitative fit. Our analysis, however, is regulated by the value of the strong coupling in the infrared region that enters through large x resummation effects, and that can suppress, or absorb, higher twist effects. Large x data therefore indirectly provide a measurement of this quantity that can be compared to extractions from other observables.Comment: 10 pages, 3 figure

    Experience in designing the foundations of a multi-storey building on the eluvial soils of the Urals using a model of non-linear soil deformation

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    The article describes an example of the first design of the foundation of a high-rise building in the Middle Urals using a non-linear soil model that reflects the real deformation properties of the soil. The use of an effective model that reflects the real deformation properties of the soil has allowed to reduce the cost of the foundation by more than two times while increasing of its reliability. © Published under licence by IOP Publishing Ltd

    Parton distributions from deep-inelastic-scattering data

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    We perform the analysis of existing light-targets deep-inelastic-scattering (DIS) data in the leading-order (LO), next-to-leading-order (NLO), and next-to-next-to-leading-order (NNLO) QCD approximations and extract PDFs simultaneously with the value of the strong coupling constant αs\alpha_s and the high-twist contribution to the structure functions. The main theoretical uncertainties and experimental uncertainties due to all sources of experimental errors in data are estimated, the latter generally dominate for the obtained PDFs. The uncertainty in Higgs boson production cross section due to errors in PDFs is 2\sim 2% for the LHC and varies from 2% to 10% for the Fermilab collider under variation of the Higgs boson mass from 100GeV100 {\rm GeV} to 300GeV300 {\rm GeV}. For the WW-boson production cross section the uncertainty is 2\sim 2% for the both colliders. The value of αsNNLO(MZ)=0.1143±0.0014(exp.)\alpha^{\rm NNLO}_{\rm s}(M_{\rm Z})=0.1143\pm 0.0014({\rm exp.}) is obtained, while the high-twist terms do not vanish up to the NNLO as required by comparison to data
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