58,023 research outputs found

    Driven localized excitations in the acoustic spectrum of small nonlinear macroscopic and microscopic lattices

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    Both bright and dark traveling, locked, intrinsic localized modes (ILMs) have been generated with a spatially uniform driver at a frequency in the acoustic spectrum of a nonlinear micromechanical cantilever array. Complementary numerical simulations show that a minimum density of modes, hence array size, is required for the formation of such locked smoothly running excitations. Additional simulations on a small 1-D antiferromagnetic spin system are used to illustrate that such uniformly driven running ILMs should be a generic feature of a nanoscale atomic lattice.Comment: Physical Review Letters, accepte

    Time synchronization via the transit satellite at Mizusawa

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    Time signals emitted from Transit satellites and received by the NAVICODE type receiver at Mizusawa, Japan are presented. The International Latitude Observatory of Mizusawa and the U. S. Naval Observatory were compared using the time signals. Propagation delays, a receiver delay, effects of relative motion of satellites, and effects of the ionosphere are discussed

    Ambiguities of theoretical parameters and CP/T violation in neutrino factories

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    We study the optimal setup for observation of the CP asymmetry in neutrino factory experiments --- the baseline length, the muon energy and the analysis method. First, we point out that the statistical quantity which has been used in previous works doesn't represent the CP asymmetry. Then we propose the more suitable quantity, χ22\equiv \chi^{2}_{2} , which is sensitive to the CP asymmetry. We investigate the behavior of χ22 \chi^{2}_{2} with ambiguities of the theoretical parameters. The fake CP asymmetry due to the matter effect increases with the baseline length and hence the error in the estimation of the fake CP asymmetry grows with the baseline length due to the ambiguities of the theoretical parameters. Namely, we lose the sensitivity to the genuine CP-violation effect in longer baseline.Comment: 8pages, 2figures, Talk given by J. Sato at Joint U.S. / Japan Workshop on New Initiatives in Muon Lepton Flavor Violation and Neutrino Oscillation with High Intense Muon and Neutrino Sources, Honolulu, Hawaii, 2-6 Oct 200

    Deep-inelastic and quasielastic electron scattering from A=3A=3 nuclei

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    We perform a combined analysis of inclusive electron scattering data from A=3A=3 nuclei in the deep-inelastic and quasielastic scattering regions, using Monte Carlo analysis methods and the nuclear weak binding approximation to establish the range over which the data can be described within the same theoretical framework. Comparison with quasielastic 3^3He cross sections from SLAC and Jefferson Lab suggests that most features of the x1x \gtrsim 1 data can be reasonably well described in the impulse approximation with finite-Q2Q^2 nuclear smearing functions for momentum transfers Q21Q^2 \gtrsim 1 GeV2^2. For the DIS region, we analyze the recent 3^3He to deuterium cross section ratio from the Jefferson Lab E03-103 experiment to explore the possible isospin dependence of the nuclear effects. We discuss the implications of this for the MARATHON experiment at Jefferson Lab, and outline how a Bayesian analysis of 3^3He, 3^3H and deuterium data can robustly determine the free neutron structure function.Comment: 45 pages, 14 figure

    Point interactions in one dimension and holonomic quantum fields

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    We introduce and study a family of quantum fields, associated to delta-interactions in one dimension. These fields are analogous to holonomic quantum fields of M. Sato, T. Miwa and M. Jimbo. Corresponding field operators belong to an infinite-dimensional representation of the group SL(2,\Rb) in the Fock space of ordinary harmonic oscillator. We compute form factors of such fields and their correlation functions, which are related to the determinants of Schroedinger operators with a finite number of point interactions. It is also shown that these determinants coincide with tau functions, obtained through the trivialization of the det\mathrm{det}^*-bundle over a Grassmannian associated to a family of Schroedinger operators.Comment: 17 page

    Strange quark suppression from a simultaneous Monte Carlo analysis of parton distributions and fragmentation functions

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    We perform the first simultaneous extraction of unpolarized parton distributions and fragmentation functions from a Monte Carlo analysis of inclusive and semi-inclusive deep-inelastic scattering, Drell-Yan lepton-pair production, and single-inclusive e+ee^+ e^- annihilation data. We use data resampling techniques to thoroughly explore the Bayesian posterior distribution of the extracted functions, and use kk-means clustering on the parameter samples to identify the configurations that give the best description across all reactions. Inclusion of the semi-inclusive data reveals a strong suppression of the strange quark distribution at parton momentum fractions x0.01x \gtrsim 0.01, in contrast with the ATLAS observation of enhanced strangeness in W±W^\pm and ZZ production at the LHC. Our study reveals significant correlations between the strange quark density and the strange \to kaon fragmentation function needed to simultaneously describe semi-inclusive K±K^\pm production data from COMPASS and inclusive K±K^\pm spectra in e+ee^+ e^- annihilation from ALEPH and SLD, as well as between the strange and light antiquark densities in the proton.Comment: 6 pages, 4 figures; version to appear in Phys. Rev.

    Large Lepton Mixing in a Coset-space Family Unification on E7/SU(5)×U(1)3E_7/SU(5) \times U(1)^3

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    We study a coset-space unification model for families based on E7/SU(5)×U(1)3E_7/SU(5) \times U(1)^3. We find that qualitative structure of quark and lepton mass matrices in this model describes very well the observation. We stress, in particular, that the large mixing angle, sin22θνμντ1\sin^22\theta_{\nu_\mu\nu_\tau} \simeq 1, required for the atmospheric neutrino oscillation reported by the SuperKamiokande collaboration, is naturally obtained, which is a consequence of unparallel family structure in the present coset-space unification.Comment: 8 pages, Latex2
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