The principle that unitarity must be preserved in all processes, no matter how exotic, has led to deep insights into boundary conditions in cosmology and black hole theory. In the case of black hole evaporation, Horowitz and Maldacena were led to propose that unitarity preservation can be understood in terms of a restriction imposed on the wave function at the singularity. Gottesman and Preskil...

In a transport model that combines initial state interactions of the photon with final state interactions of the produced particles we present a calculation of inclusive photoproduction of mesons in nuclei in the energy range from 1 to 7 GeV. We give predictions for the photoproduction cross sections of pions, etas, kaons, antikaons, and π + π − invariant mass spectra in 12 C and 208 Pb. The ef...

We calculate the shape of the ππ and ¯ K N invariant mass distributions in the b → J/ψ π and b → J/ψ ¯ K N decays that are dominated by the (1405) resonance. The weak interaction part is the same for both processes and the hadronization into the different meson–baryon channels in the final state is given by symmetry arguments. The most important feature is the implementation of the meson–baryon...

The missing mass spectrum measured in high resolution studies of the reaction pp → K + X is analyzed with respect to the strong final state interaction near the Λp production threshold. The observed spectrum can be described by factorizing the reaction amplitude in terms of a production amplitude and a final state scattering amplitude. Parametrizing the Λp final state interaction in terms of th...

We propose that in quantum gravity one needs to impose a final state boundary condition at black hole singularities. This resolves the apparent contradiction between string theory and semiclassical arguments over whether black hole evaporation is unitary.

I discuss the rôle of strong final state interactions (FSI) in K → 2π decays. In this case strong FSI effects can be resummed [1,2] by solving the Omnès problem for K → 2π amplitudes. Implications for the CP conserving ∆I = 1/2 ratio and the direct CP violation parameter ε ′ /ε are also discussed.

We study the coherent final state interaction of an energetic parton produced in AA collisions caused by the change in the cutoff scale and running coupling constant from the vacuum to QGP. We demonstrate that the contribution of this new mechanism to the energy loss may be of the order of magnitude of the induced gluon radiation. However, an accurate evaluation of this medium effect is a diffi...

We analyse the pp → pΛK cross section recently measured at COSY arguing that the enhancement of the production cross section at energies close to the reaction threshold should be due to the Λp final state interaction. We find that the experimental Λp elastic scattering data as well as the predictions from the Jülich-Bonn model are in reasonable agreement with the new results on K +-meson produc...

It has been shown that a final state interaction model, used to describe J/ψ suppression, can also describe the fixed p T suppression of the π 0 (and charged pions) yield at all values of p T , with a final state interaction cross-section σ close to one milibarn. We propose an extension of the model to the pion motion in the transverse plane – which introduces a dependence of the suppression on...

We analyse the pp → pΛK cross section recently measured at COSY arguing that the enhancement of the production cross section at energies close to the reaction threshold should be due to the Λp final state interaction. We find that the experimental Λp elastic scattering data as well as the predictions from the Jülich-Bonn model are in reasonable agreement with the new results on K-meson producti...