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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)

- Boris Kopeliovich, Jan Nemchik, Enrico Predazzi
- 1995

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)

- 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)

- R Roncaglia, A Dzierba, D B Lichtenberg, E Predazzi
- 1994

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)

- P Desgrolard, M Giffon, E Martynov, E Predazzi
- 2000

We have investigated several models of Pomeron and Odderon contributions to high energy elastic pp and ¯ pp scattering. The questions we address concern their role in this field, the behavior of the scattering amplitude (or of the total cross-section) at high energy, and how to fit all high energy elastic data. The data are extremely well reproduced by our… (More)

- Bo-Qiang Ma, M Anselmino, E Predazzi
- 1997

It is shown that the proton spin problem raised by the Ellis-Jaffe sum rule violation does not in conflict with the SU(6) quark model, provided that the relativistic effect from the quark transversal motions, the flavor asymmetry between the u and d valence quarks, and the intrinsic quark-antiquark pairs generated by the non-perturbative meson-baryon… (More)

- P Desgrolard, M Giffon, E Martynov, E Predazzi
- 2000

An extensive generalization of the ordinary and quasi-eikonal methods is presented for the pp and ¯ pp elastic scattering amplitudes, which takes into account in a phe-nomenological way all intermediate multiparticle states involving the crossing even and crossing odd combinations of Reggeons. The formalism in this version involves a maximum of three… (More)