6,014 research outputs found
Large mass expansion in two-loop QCD corrections of para-charmonium decay
We calculate the two-loop QCD corrections to paracharmonium decays and involving light-by-light
scattering diagrams with light quark loops. Artificial large mass expansion and
convergence improvement techniques are used to evaluate these corrections. The
obtained corrections to the decays and
account for and of the leading
order contribution, respectively.Comment: 24 pages, 10 figures; REVTeX version; Version to appear in Phys. Rev.
D, 9 pages, 4 figure
Error-driven Global Transition in a Competitive Population on a Network
We show, both analytically and numerically, that erroneous data transmission
generates a global transition within a competitive population playing the
Minority Game on a network. This transition, which resembles a phase
transition, is driven by a `temporal symmetry breaking' in the global outcome
series. The phase boundary, which is a function of the network connectivity
and the error probability , is described quantitatively by the
Crowd-Anticrowd theory.Comment: 4 pages, 3 figure
Towards a knowledge based web design for structured decision-making:a design-oriented research project in an inter-governmental organisation
Internal character dictates phase transition dynamics between isolation and cohesive grouping
We show that accounting for internal character among interacting,
heterogeneous entities generates rich phase transition behavior between
isolation and cohesive dynamical grouping. Our analytical and numerical
calculations reveal different critical points arising for different
character-dependent grouping mechanisms. These critical points move in opposite
directions as the population's diversity decreases. Our analytical theory helps
explain why a particular class of universality is so common in the real world,
despite fundamental differences in the underlying entities. Furthermore, it
correctly predicts the non-monotonic temporal variation in connectivity
observed recently in one such system
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