33,083 research outputs found
Influence of external disturbances and compressibility on free turbulent mixing
It is shown that disturbances in external flow can significantly affect, by as much as an order of magnitude, the turbulent mixing rate in free shear layers and that the length scale of the external flow disturbances is as important as the amplitude. The difference between the effect of wide-band and narrow-band disturbances is stressed. The model for pressure fluctuation term in the kinetic energy equation is included in a two-equation model. The reduced spreading rate in high Mach number, high Reynolds number, adiabatic, free turbulent shear layers is predicted
An extension of tribimaximal lepton mixing
Harrison, Perkins and Scott have proposed simple charged lepton and neutrino
mass matrices that lead to the tribimaximal mixing . We consider
in this work an extension of the mass matrices so that the leptonic mixing
matrix becomes , where
is a unitary matrix needed to diagonalize the charged lepton mass matrix and
measures the deviation of the neutrino mixing matrix from the bimaximal
form. Hence, corrections to arise from both charged lepton and
neutrino sectors. Following our previous work to assume a Qin-Ma-like
parametrization for the charged lepton mixing matrix in
which the {\it CP}-odd phase is approximately maximal, we study the
phenomenological implications in two different scenarios: and . We find that the latter is more
preferable, though both scenarios are consistent with the data within
ranges. The predicted reactor neutrino mixing angle in both
scenarios is consistent with the recent T2K and MINOS data. The leptonic {\it
CP} violation characterized by the Jarlskog invariant is generally
of order .Comment: 20 pages and 8 figures, Accepted in Phys.Review
An analytical transformation technique for generating uniformly spaced computational mesh
An analytical transformation method which can map arbitrary physical coordinate grid distribution into desired computational coordinate with uniform grid distribution is derived. The transformation function and its higher derivatives are differentiable. Salient features include; (1) precise control of grid sizes; (2) more than one location of clustered grids; (3) exact positioning of particular computational nodes in the physical plane; and (4) ensuring several patches of uniformly spaced grids in the physical plane for the higher accuracies (such as at the boundaries), etc., while keeping the variation of grid spacing continuous to avoid numerical instability
Charmonium-hadron interactions from QCD
The heavy quark system is an excellent probe to learn about the QCD dynamics
at finite density. First, we discuss the properties of the and
meson at finite nucleon density. We discuss why their properties should change
at finite density and then introduce an exact QCD relation among these hadron
properties and the energy momentum tensor of the medium. Second, we discuss
attempts to calculate charmonium-hadron total cross section using effective
hadronic models and perturbative QCD. We emphasize a recent calculation, where
the cross section is derived using QCD factorization theorem. We conclude by
discussing some challenges for SIS 200.Comment: 8 pages, Presented at 6th International Conference on Strange Quarks
in Matter: 2001: A Flavorspace Odyssey (SQM2001), Frankfurt, Germany, 25-29
Sep 2001, submitted to J. Phys.
The possibility of Z(4430) resonance structure description in reaction
The possible description of Z(4430) as a pseudoresonance structure in reaction, is considered. The analysis is performed with
single-scattering contribution to elastic scattering via
intermediate energy.Comment: 3 pages, 4 figure
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