6,224 research outputs found
Renormalization programme for effective theories
We summarize our latest developments in perturbative treating the effective
theories of strong interactions. We discuss the principles of constructing the
mathematically correct expressions for the S-matrix elements at a given loop
order and briefly review the renormalization procedure. This talk shall provide
the philosophical basement as well as serve as an introduction for the material
presented at this conference by A. Vereshagin and K. Semenov-Tian-Shansky.Comment: 6 pages, talk given at HSQCD 2004, Russia, May 2004, to be published
in Proceeding
Bootstrap and the Parameters of Pion-Nucleon Resonances
In this talk we demonstrate the results of application of the perturbative
effective theory formalism developed in recent papers to the calculation of
elastic scattering amplitude. Restrictions on the contributing
resonance parameters are obtained and the low energy coefficients are
calculated.Comment: 6 pages, talk given at the X. International Conference On Hadron
Spectroscopy (HADRON'03), August 31 - September 6, 2003, Aschaffenburg,
Germany; to appear in Proceeding
Localizable Effective Theories, Bootstrap and the Parameters of Hadron Resonances
We discuss the basic principles of constructing a meaningful perturbative
scheme for effective theory. The main goal of this talk is to explain the
approach and to present recent results obtained with the help of the method of
Cauchy forms in several complex variables.Comment: 6 pages, Talk given at the X. International Conference On Hadron
spectroscopy (HADRON'03), August 31 - September 6, 2003, Aschaffenburg,
Germany; to appear in Proceeding
Thermal budget of superconducting digital circuits at sub-kelvin temperatures
Superconducting single-flux-quantum (SFQ) circuits have so far been developed
and optimized for operation at or above helium temperatures. The SFQ approach,
however, should also provide potentially viable and scalable control and
read-out circuits for Josephson-junction qubits and other applications with
much lower, milli-kelvin, operating temperatures. This paper analyzes the
overheating problem which becomes important in this new temperature range. We
suggest a thermal model of the SFQ circuits at sub-kelvin temperatures and
present experimental results on overheating of electrons and silicon substrate
which support this model. The model establishes quantitative limitations on the
dissipated power both for "local" electron overheating in resistors and
"global" overheating due to ballistic phonon propagation along the substrate.
Possible changes in the thermal design of SFQ circuits in view of the
overheating problem are also discussed.Comment: 10 pages, 8 figures, submitted to J. Appl. Phy
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