17,820 research outputs found
Study of the reaction and an alternative explanation for the " pentaquark" peak
We present a calculation of the reaction with the
aim of seeing if the experimental peak observed in the invariant mass
around 1526 MeV, from where evidence for the existence of the has
been claimed, can be obtained without this resonance as a consequence of the
particular dynamics of the process and the cuts applied in the experimental set
up. We find that a combination of facts leads indeed to a peak around 1530 MeV
for the invariant mass of without the need to invoke any new resonance
around this energy. This, together with statistical fluctuations that we prove
to be large with the statistics of the experiment, is likely to produce the
narrower peak observed there.Comment: published versio
Fixed point theorems via Nash Equilibria
In this note we show that the fixed points of a continuous function (or of an upper semi-continuous correspondence, with non-empty and convex values) can be attained as Nash Equilibria of a game with finitely many players.
Tunable control of the bandwidth and frequency correlations of entangled photons
We demonstrate experimentally a new technique to control the bandwidth and
the type of frequency correlations (correlation, anticorrelation, and even
uncorrelation) of entangled photons generated by spontaneous parametric
downconversion. The method is based on the control of the group velocities of
the interacting waves. This technique can be applied in any nonlinear medium
and frequency band of interest. It is also demonstrated that this technique
helps enhance the quality of polarization entanglement even when femtosecond
pulses are used as a pump.Comment: 4 pages, 4 figures, submitted to Phys. Rev. Let
General equilibrium existence with asset-backed securitization
We propose a specification of a general equilibrium model with securitization of collateral-backed promises and discuss the role of physical collateral to avoid, in equilibrium, pessimistic beliefs about the future rates of default. Promises are pooled in either pass-through securities or collateralized loans obligations (CLO), allowing the existence of different seniority lev- els among tranches in the same CLO. In case of default, borrowers may also suffer extra-economic penalties, which are internalized into a structure of non-ordered preferences. In this context, we prove the existence of an equilibrium in that investors are not over-pessimistic about the payments of derivatives. JEL Codes: D52, D91Asset Backed-Securitization, Extra-economic Default Penalties, Collateral, Non- ordered Preferences
- âŠ