0000000000890095

AUTHOR

R. Sommer

showing 2 related works from this author

Electrostatic model and NMR results for EFG tensors in tetragonal BaTiO3

1990

Abstract We present 47,49Ti and 135,137Ba NMR second-order quadrupolar rotation patterns in a tetragonal single domain crystal of BaTiO3. These data will be analysed in terms of a ionic polarizable point multipole model.

Materials scienceIonic bondingCondensed Matter PhysicsMolecular physicsElectronic Optical and Magnetic MaterialsCrystalCondensed Matter::Materials ScienceTetragonal crystal systemNuclear magnetic resonancePolarizabilityPhysics::Atomic and Molecular ClustersCondensed Matter::Strongly Correlated ElectronsPhysics::Atomic PhysicsSingle domainMultipole expansionRotation (mathematics)Electrostatic modelFerroelectrics
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Semi-leptonic Decays of Heavy Flavours on a Fine Grained Lattice

1994

We present the results of a numerical calculation of semi-leptonic form factors relevant for heavy flavour meson decays into light mesons, at $\beta=6.4$ on a $24^3 \times 60$ lattice, using the Wilson action in the quenched approximation. We obtain $f^+_K(0)=0.65\pm 0.18$, $V(0)=0.95\pm 0.34$, $A_1(0)=0.63\pm 0.14 $ and $A_2(0)=0.45\pm 0.33 $. We also obtain $A_1(q^2_{max})=0.62\pm 0.09$, $V(0)/A_1(0)=1.5\pm 0.28 $ and $A_2(0)/A_1(0)=0.7\pm 0.4$. The results for $f^+_K(0)$, $V(0)$ and $A_1(0)$ are consistent with the experimental data and with previous lattice determinations with larger lattice spacings. In the case of $A_2(0)$ the errors are too large to draw any firm conclusion. We have …

QuarkPhysicsNuclear and High Energy PhysicsFirm conclusionParticle physicsMesonHigh Energy Physics - Lattice (hep-lat)FísicaFOS: Physical sciencesQuenched approximationHigh Energy Physics - PhenomenologyHigh Energy Physics - LatticeHigh Energy Physics - Phenomenology (hep-ph)Lattice (order)Heavy quark effective theoryB meson
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