By André Morel (auth.), F. Bradamante, J.-M. Richard, R. Klapisch (eds.)
The 3rd process the foreign university on Physics with Low strength Antiprotons was once held in Erice, Sicily on the Ettore Majorana Centre for clinical tradition, from 10 to 18 June, 1988. the college is devoted to physics obtainable to experiments utilizing low strength antiprotons, specially in view of operation of the LEAR facility at CERN with the upgraded antiproton resource AAC (Antiproton Accumulator AA and Antiproton Collector ACOL). the 1st direction in 1986 coated issues concerning primary symmetries; the second one direction in 1987 thinking about spectroscopy of sunshine and heavy quarks. This ebook con tains the court cases of the 3rd direction, dedicated to the experimental and theoretical points of the interplay of antinucleons with nucleons and nuclei. The complaints include either the educational lectures and contributions provided by way of individuals in the course of the university. The papers are geared up in different sections. the 1st part bargains with the theoretical elements of NN scattering and annihilation, and the underlying QCD. The experimental strategies and effects relating NN scattering are contained in part II. part III comprises theoretical studies and contributions on anti proton-nucleus scattering and certain states. part IV is dedicated to the experimental effects at the antiproton nucleus platforms and their phenomenological research. ultimately, a few attainable advancements of the antiproton machines are presented.
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Additional resources for Antiproton-Nucleon and Antiproton-Nucleus Interactions
13), the struck quark is off-shell at order (1 - x )Q2 whereas the momentum transfer of the exchanged gluon is of order (1 - x)(1 - y )Q2, which can be considerably smaller. (1-x)(1-y) 02 Fig. 13. Leading twist contribution to the meson form factor in QeD. In fact, as shown by Lepage and myself: 8 the momentum transfer scale where one can analyze amplitudes perturbatively in QCD is controlled by the virtuality of the quark propagator not that of the exchanged gluon. ] If the struck quark is sufficiently off-shell, Ik~ I > A~CD' one can easily show that multiple soft gluon exchange contributions are suppressed by powers of Q2 relative to one-gluon exchange.
In fact, the QCD sum rule distributions, combined with the perturbative QCD factorization predictions, account well for the scaling, normalization of the pion form factor and also the branching ratio for J / 'IjJ --+ pp. In addition, Maina has found that the data for large angle Compton scattering --+ are also well 1s described. However, a very recent lattice calculation of the lowest two moments by Martinelli and Sachrajda is does not show skewing of the average fraction of momentum of the valence quarks in the proton.
QCD prediction for the scaling and angular distribution for r + r -+ P + p calculated by Gunion, Sparks and Miller/o CZ distribution amplitudes' are assumed. The solid and running curves are for real photon annihilation. 1. = Hadron helicity conservation may be relevant to an interesting puzzle concerning the exclusive decays J / t/J and t/J' -+ p1l", K* K and possibly other Vector-Pseudoscalar (VP) combinations. One expects J/t/J(t/J') to decay to hadrons via three gluons or, occasionally, via a single direct photon.
Antiproton-Nucleon and Antiproton-Nucleus Interactions by André Morel (auth.), F. Bradamante, J.-M. Richard, R. Klapisch (eds.)