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Predicting the masses of baryons containing one or two heavy quarks The Feynman-Hellmann theorem and semiempirical mass formulas are used to predict the masses of baryons containing one or two heavy quarks. In particular, the mass of the Λ b is predicted to be 5620 ± 40 MeV, a value consistent with measurements. In a recent paper [1], the Feynman-Hellmann… (More)

We present a space-time description of hadronization of highly virtual quarks originating from a deep-inelastic electron scattering (DIS). Important ingredients of our approach are the time-and energy–dependence of the density of energy loss for gluon radiation, the Sudakov's suppression of no radiation, and the effect of color transparency, which… (More)

Radiative energy loss of a highly virtual quark originating from a deep-inelastic electron scattering plays a crucial role in production of leading hadrons off nuclei. The density of energy loss for gluon radiation turns out to be time-and energy–dependent in inclusive hadron production. Important phenomena involved are Sudakov's suppression of no radiation… (More)

- Giorgio Brida, Marco Genovese, Marco Gramegna, Matteo G. A. Paris, E. Predazzi, E. Cagliero
- Open Syst. Inform. Dynam.
- 2006

We discuss a scheme for reconstructing experimentally the diagonal elements of a density matrix representing quantum optical state. Applications to PDC heralded photons, multi-thermal and attenuated coherent states are illustrated and discussed in more detail.

- G Brida, M Genovese, A Meda, E Predazzi, I Ruo-Berchera
- 2008

(xx/xx/xxxx) Speckle structure of parametric down conversion light has recently received a large attention due to relevance in view of applications to quantum imaging The possibility of tailoring the speckle size by acting on the pump properties is an interesting tool for the applications to quantum imaging and in particular to the detection of weak object… (More)

- G Brida, M Genovese, C Novero, E Predazzi
- 2000

We report on the realisation of a new test of Bell inequalities using the superposition of type I parametric down conversion produced in two different non-linear crystals pumped by the same laser, but with different polarisations. We discuss the advantages and the possible developments of this configuration. Many experiments have already been devoted to a… (More)

- B Z Kopeliovich, J Nemchik, E Predazzi, A Hayashigaki
- 2003

the date of receipt and acceptance should be inserted later Abstract. Nuclei are unique analyzers for the early stage of the space-time development of hadronization. DIS at medium energies is especially suitable for this task being sensitive to hadronization dynamics, since the production length is comparable with the nuclear size. This was the driving… (More)

The elastic hadronic amplitude is calculated using the nonperturbative light-cone dipole representation for gluon bremsstrahlung. The data for large mass diffraction demand a two-scale structure of light hadrons: the gluon clouds of the valence quarks are much smaller (∼ 0.3 f m) than the hadronic size. The presence of the two scales unavoidably leads to a… (More)

There are striking regularities in the masses and mass differences of known hadrons. Some of these regularities can be understood from known general properties of the interactions of quarks without a need to specify the explicit form of the Hamiltonian. The Feynman–Hellmann theorem is one of the tools providing this understanding. If the mass regularities… (More)

- Jean-Jacques Dugne, Sverker Fredriksson, Johan Hansson, Enrico Predazzi
- 1999

A new model for the substructure of quarks, lep-tons and weak gauge bosons, is discussed. It is based on three fundamental and absolutely stable spin-1/2 preons. Its preon flavour SU (3) symmetry leads to a prediction of nine quarks, nine leptons and nine heavy vector bosons. One of the quarks has charge −4e/3, and is speculated to be the top quark (whose… (More)