14,320 research outputs found
Response to sub-threshold stimulus is enhanced by spatially heterogeneous activity
Sub-threshold stimuli cannot initiate excitations in active media, but
surprisingly as we show in this paper, they can alter the time-evolution of
spatially heterogeneous activity by modifying the recovery dynamics. This
results in significant reduction of waveback velocity which may lead to spatial
coherence, terminating all activity in the medium including spatiotemporal
chaos. We analytically derive model-independent conditions for which such
behavior can be observed.Comment: 5 pages, 5 figure
Prediction of the asymmetry in decay
Of all decays, the decay
has the smallest observed branching ratio as it takes place primarily via the
suppressed -exchange diagram. The asymmetry for this mode is yet to be
measured experimentally. By exploiting the relationship among the decay
amplitudes of decays (using isospin and topological
amplitudes) we are able to relate the asymmetries and branching ratios by
a simple expression. This enables us to predict the asymmetry in
. While the predicted central values of
are outside the physically allowed region, they are currently associated with
large uncertainties owing to the large errors in the measurements of the branching ratio (), the other asymmetries
(of ) and (of ). With a precise determination of , and
, one can use our analytical result to predict with a
reduced error and compare it with the experimental measurement when it becomes
available. The correlation between and is an interesting
aspect that can be probed in ongoing and future particle physics experiments
such as LHCb and Belle II.Comment: 21 pages, 6 figures, accepted for publication in JHE
- β¦