169 research outputs found
Antideuteron production in proton-proton and proton-nucleus collisions
The experimental data of the antideuteron production in proton-proton and
proton-nucleus collisions are analyzed within a simple model based on the
diagrammatic approach to the coalescence model. This model is shown to be able
to reproduce most of existing data without any additional parameter.Comment: To appear in Eur. Phys. J A (2002
Stability under dwell time constraints: Discretization revisited
We decide the stability and compute the Lyapunov exponent of continuous-time
linear switching systems with a guaranteed dwell time. The main result asserts
that the discretization method with step size~ approximates the Lyapunov
exponent with the precision~, where~ is a constant. Let us stress
that without the dwell time assumption, the approximation rate is known to be
linear in~. Moreover, for every system, the constant~ can be explicitly
evaluated. In turn, the discretized system can be treated by computing the
Markovian joint spectral radius of a certain system on a graph. This gives the
value of the Lyapunov exponent with a high accuracy. The method is efficient
for dimensions up to, approximately, ten; for positive systems, the dimensions
can be much higher, up to several hundreds
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