7,164 research outputs found

    About one method of analytical calculations of reaction amplitudes with fermions

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    The paper presents the new method of calculations of reaction amplitudes of processes with spin 1/2 fermions. The method is based on the application of isotropic tetrad in Minkowski space and basis spinors connected with it. We obtained as test and illustration of the method the amplitudes of interaction processes ee+ffˉe^-e^+\to f \bar{f} , ee+WW+e^- e^+\to W^-W^+ and one of the possible diagrams of the process e+ee+ee+ee+ee^+e^-\to e^+e^-e^+e^-e^+e^-.Comment: 18 pages, 3 Postscript figures, submitted in Phys.Rev.

    Decay Constant of Pseudoscalar Meson in the Heavy Mass Limit

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    The leptonic decay constant of the pseudoscalar mesons a calculated by use of the relativistic constituent quark model constructed on the point form of Poincare-covariant quantum mechanics. We discuss the role relativistic corrections for decay constants of pseudoscalar mesons with heavy quarks. We consider the heavy mass limit of decay constant for two-particle system with equal masses.Comment: Talk given at NPCS'98,Minsk,Belarus,1998. To be published in the proceedings. 4 page

    One kind of spinor techniques for massive fermions

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    In the work we have considered the reduction techniques matrix element of the reaction interaction of elementary particles for massive fermions to spinor products . The our procedure is not more complex than CALCUL spinor techniques for massless fermions. It is relatively simple and leads to basic spinor products with any polarizationod fermions. Also obtained spinor Chisholm identities for massive fermions.Comment: 7 pages. Talk given at QFTHEP'99 Workshop Moscow, Russia, May 27 - June 2 1999. To be published in the proceeding

    About distribution and origin of the peculiar group of sporadic meteors

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    A particular group of sporadic meteors are picked out from analysis of meteor catalogs derived from results of radar observations in Mogadisho and Kharkov. The semi-major axes are equal or more than 1.73 AU and inclinations of orbits are equal or more than 90 degrees for these meteors. The distributions of radiants, velocities, and elements of orbits were derived. The probable source of meteor bodies of this peculiar group is the long-period comets, in particular, the comets of the Kreutz's group

    Enhanced Correlations and Wide Charge Distributions in Pion Production

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    Unusual phenomena in pion production are considered.It is argued that pions may be in a squeezed state having enhanced identical pion correlations. Charge distribution in soft chiral pion bremsstrahlung is shown to be very broad.Comment: 5 page

    Sketches from the life of hypercomplex numbers

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    In the article, the main ideas of the induction construction arXiv:1204.0194, arXiv:1110.4737, arXiv:1202.0941, arXiv:1208.4466 are considered in the form of sketches. The article establishes a link between Clifford algebras and alternative-elastic algebras at the level of connectors.Comment: MiKTeX v2.9, 16 page

    Reaction of the fermion field on spontaneous change of its mass

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    Modification of the particles in the course of the source evolution is considered. Influence of this effect on multiplicities and correlations of the particles is displayed, including an enhancement of the production rates and identical particle correlations and also back-to-back particle-antiparticle correlations.Comment: (11 pages, Latex, 0 Figs, Third Sakharov Conf.,Moscow, June 2002

    Autolocalization in a dipolar exciton system

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    We develop the autolocalization hypothesis suggested recently in [Andreev, Phys. Rev. Lett. 110, 146401 (2013)] to explain the formation of the macroscopically ordered exciton state (MOES) in semiconductor quantum wells [L. V. Butov et al., Nature (London) 418, 751 (2002)]. We argue that the onset of a periodical localizing potential having a macroscopic spatial period is possible in the systems where in addition to long-range dipolar repulsion the excitons exhibit resonant pairing at short distances. Our theory suggests, that the central incoherent part of each condensate in the MOES may represent a novel quantum molecular phase, which was predicted and discussed theoretically several years ago in the context of resonant Bose superfluids.Comment: 5 pages, 2 figure

    Thermodynamic model of the macroscopically ordered exciton state

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    We explain the experimentally observed instability of cold exciton gases and formation of a macroscopically ordered exciton state (MOES) in terms of a thermodynamic model accounting for the phase fluctuations of the condensate. We show that the temperature dependence of the exciton energy exhibits fundamental scaling behavior with the signature of the second order phase transition.Comment: 3 figure

    Using of Phenomenological Piecewise Continuous Map for Modeling of Neurons Behaviour

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    A piecewise continuous map for modeling bursting and spiking behaviour of isolated neuron is proposed. The map was created from phenomenological viewpoint. The map demonstrates oscillations, which are qualitatively similar to oscillations generating by Rose-Hindmarsh model. The synchronization in small ensembles of the maps is investigated. It is considered the different number of elements in the ensemble and different connectivity topologies.Comment: 4 pages RevTeX, 7 figures PostScript, revised versio
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