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Search Results: 1 - 10 of 189959 matches for " G. Vasseur "
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Measurements of the angle alpha (phi2) at B factories
G. Vasseur
Physics , 2008,
Abstract: The measurements of the angle alpha (phi2) of the unitarity triangle at the B factories are reviewed. The value of alpha determined by combining the results obtained in the B to pi pi, B to rho pi, and B to rho rho modes by both the BABAR and Belle experiments is (87.5 +6.2 -5.3) degrees.
B --> rho K* decays and other rare vector-vector modes
G. Vasseur
Physics , 2007,
Abstract: The recent analyses of the following rare vector-vector decays of the B meson are presented: rho K*, omega K*, omega rho, omega omega, and omega phi charmless final states. The latest results indicate that the fraction of longitudinal polarization is about 0.5 in penguin-dominated modes and close to 1 for tree-dominated modes.
Electric turbulence in a plasma subject to a strong magnetic field
G. Loeper,A. Vasseur
Mathematics , 2005,
Abstract: We consider in this paper a plasma subject to a strong deterministic magnetic field and we investigate the effect on this plasma of a stochastic electric field. We show that the limit behavior, which corresponds to the transfer of energy from the electric wave to the particles (Landau phenomena), is described by a Spherical Harmonics Expansion (SHE) model.
A Discontinuous Galerkin Method for Viscous Compressible Multifluids
C. Michoski,J. A. Evans,P. G. Schmitz,A. Vasseur
Physics , 2009, DOI: 10.1016/j.jcp.2009.11.033
Abstract: We present a generalized discontinuous Galerkin method for a multicomponent compressible barotropic Navier-Stokes system of equations. The system presented has a functional viscosity nu which depends on the pressure p=p(rho,mu_i) of the flow, with the density rho and the local concentration mu_i. High order Runge-Kutta time discretization techniques are employed, and different methods of dealing with arbitrary coupled boundary conditions are discussed. Analysis of the energy consistency of the scheme is performed in addition to inspection of the relative error of the solution compared to exact analytic test cases. Finally several examples, comparisons, generalizations and physical applications are presented.
Quantum Hydrodynamics with Trajectories: The Nonlinear Conservation Form Mixed/Discontinuous Galerkin Method with Applications in Chemistry
C. Michoski,J. A. Evans,P. G. Schmitz,A. Vasseur
Physics , 2009, DOI: 10.1016/j.jcp.2009.08.011
Abstract: We present a solution to the conservation form (Eulerian form) of the quantum hydrodynamic equations which arise in chemical dynamics by implementing a mixed/discontinuous Galerkin (MDG) finite element numerical scheme. We show that this methodology is stable, showing good accuracy and a remarkable scale invariance in its solution space. In addition the MDG method is robust, adapting well to various initial-boundary value problems of particular significance in a range of physical and chemical applications. We further show explicitly how to recover the Lagrangian frame (or pathline) solutions.
Cell Dissociation : A Cohesive Force of Hydrodynamic Origin
Hugues Vasseur
Physics , 2007,
Abstract: When an experimentalist or a biological mechanism applies an external force onto a cell chemically sticking to its substrate, a reacting 'suction' force, due to the slow penetration of the surrounding fluid between the cell and the substrate, opposes to the dissociation. This force can overcome other known adhesive forces when the process is sufficiently violent (typically 100000pN). Its maximal contribution to the total adhesive energy of the cell can then be estimated to 0.002 J/m2. The physical origin of this effect is quite simple, and it may be compared with that leaning a 'suction-cup' against a bathroom wall. We address the consequences of this effect on (i) the dissociation energy, (ii) the motion of the fluid surrounding the cell, more especially, on the pumping of the fluid by moving cells, and (iii) the inhibition of cell motion.
Operation of the T2K time projection chambers
Georges Vasseur
Physics , 2011, DOI: 10.1088/1748-0221/7/02/C02040
Abstract: The three time projection chambers of the T2K near detector are micro pattern gaseous detectors based on bulk micromegas technology. They have been operated successfully during the first two physics runs of the experiment. Their design, operation, and performance are presented.
Planar and non-planar solidification Planar and non-planar solidification of optically organized smectic films
H. Vasseur
Physics , 2010,
Abstract: We present in this letter an original freezing process yielding remarkably homogeneous films of chiral smectics. This optical homogeneity is observed on planar films as well as on films exhibiting various complex three-dimensional shapes.
Logarithmic Correlations in Quantum Hall Plateau Transitions
Romain Vasseur
Physics , 2015, DOI: 10.1103/PhysRevB.92.014205
Abstract: The critical behavior of quantum Hall transitions in two-dimensional disordered electronic systems can be described by a class of complicated, non-unitary conformal field theories with logarithmic correlations. The nature and the physical origin of these logarithmic correlation functions remain however mysterious. Using the replica trick and the underlying symmetries of these quantum critical points, we show here how to construct non-perturbatively disorder-averaged observables in terms of Green's functions that scale logarithmically at criticality. In the case of the spin quantum Hall transition, which may occur in disordered superconductors with spin-rotation symmetry and broken time reversal invariance, we argue that our results are compatible with an alternative approach based on supersymmetry. The generalization to the Integer quantum Hall plateau transition is also discussed.
Polarization of B -> VV: experimental status
Georges Vasseur
Physics , 2010,
Abstract: The experimental status of the polarization measurements in B to charmless vector-vector decays by both the Belle and Babar experiments is reviewed. The results obtained in related vector-tensor, axial vector-vector, and axial vector-axial vector modes are also given.
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