19,973 research outputs found
On the Inviscid Limit of the 3D Navier-Stokes Equations with Generalized Navier-slip Boundary Conditions
In this paper, we investigate the vanishing viscosity limit problem for the
3-dimensional (3D) incompressible Navier-Stokes equations in a general bounded
smooth domain of with the generalized Navier-slip boundary conditions
(\ref{VSg}). Some uniform estimates on rates of convergence in
and of the solutions to the
corresponding solutions of the idea Euler equations with the standard slip
boundary condition are obtained
Branching ratios of decays in the perturbative QCD approach
In this paper we calculate the branching ratios (BRs) of the 32 charmless
hadronic decays () by employing the perturbative
QCD(pQCD) factorization approach. These considered decay channels can only
occur via annihilation type diagrams in the standard model. From the numerical
calculations and phenomenological analysis, we found the following results: (a)
the pQCD predictions for the BRs of the considered decays are in the
range of to , while the CP-violating asymmetries are absent
because only one type tree operator is involved here; (b) the BRs of processes are generally much larger than those of ones due to
the large CKM factor of ; (c) since the behavior for
meson is much different from that of meson, the BRs of decays are generally larger than that of
decays; (d) the pQCD predictions for the BRs of B_c \to (K_1(1270), K_1(1400))
\etap and decays are rather sensitive to the value
of the mixing angle .Comment: 1+17 pges, 1 figure, refs. added and some clarifications made,
accepted for publication in Phys.Rev.
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