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43 papers · 1 filter
Heavy Quark Effective Field Theory at O(1/m_Q^2). II. QCD Corrections to the Currents
Christopher Balzereit, Thorsten Ohl
We present a calculation of the renormalized heavy-light and heavy-heavy currents in HQET at order O(1/m_Q^2).
Nonhermitean Random Matrix Models
Romuald A. Janik, Maciej A. Nowak, Gabor Papp +1
We introduce an extension of the diagrammatic rules in random matrix theory and apply it to nonhermitean random matrix models using the 1/N approximation. A number of one- and two-…
On the Mechanism of Time--Delayed Feedback Control
Wolfram Just, Thomas Bernard, Matthias Ostheimer +2
The Pyragas method for controlling chaos is investigated in detail from the experimental as well as theoretical point of view. We show by an analytical stability analysis that the…
The Two-Pion Exchange NN-Potential in Nuclear Matter and Nuclear Stability
R. Rapp, J. W. Durso, J. Wambach
A meson exchange model of the interaction which fits free scattering data is used to calculate the interactions of pions in nuclear matter as a function of nuclear densit…
The U(1) Problem in Chiral Random Matrix Models
Romuald A. Janik, Maciej A. Nowak, Gabor Papp +1
We show that conventional asymmetric chiral random matrix models (ChRMM), with a gaussian distribution in the asymmetry, provide for a screening of the topological charge and a res…
Substitution effects on spin fluctuations in the spin-Peierls compound CuGeO_3
M. Fischer, P. Lemmens, G. Güntherodt +4
Using Raman scattering we studied the effect of substitutions on 1D spin fluctuations in CuGeO_3 observed as a spinon continuum in frustration induced exchange scattering. For temp…