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See detailSoft data and the hard pomeron
Cudell, Jean-René ULg; Lengyel, Alexander; Martynov, E. et al

in Nuclear Physics B-Proceedings Supplements (2006, February), 152

We show that the introduction of an additional, hard, singularity in soft forward amplitudes enables one to improve considerably the fits using a simple-pole structure for the soft pomeron.

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See detailDirect extraction of hadronic form factors from elastic-scattering data
Martynov, E.; Cudell, Jean-René ULg; Lengyel, A.

in Nuclear Physics B-Proceedings Supplements (2005, September), 146

Non-forward elastic hadron-scattering data are collected and analysed within the Regge approach. Through an analysis of the data in small bins in t, we have directly extracted the pomeron trajectory and ... [more ▼]

Non-forward elastic hadron-scattering data are collected and analysed within the Regge approach. Through an analysis of the data in small bins in t, we have directly extracted the pomeron trajectory and the hadronic form factors (or reggeon couplings). We found higher values than usually used for the intercept and for the slope of the soft pomeron trajectory. The presence of zeros in t for the effective hadronic form factors is emphasised. [less ▲]

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See detailSaturation effects in pp scattering in the impact-parameter representation
Selyugin, Oleg Viktorovich; Cudell, Jean-René ULg

in Nuclear Physics B-Proceedings Supplements (2005, September), 146

The impact of unitarity is considered in different approaches to saturation in impact-parameter space. The energy and momentum-transfer dependence of the total and differential cross sections and of the ... [more ▼]

The impact of unitarity is considered in different approaches to saturation in impact-parameter space. The energy and momentum-transfer dependence of the total and differential cross sections and of the ratio of the real to imaginary parts of the scattering amplitude are obtained in a model that includes soft and hard pomeron contributions, coupled to hadrons via the electromagnetic form factor. It is shown that the hard pomeron may significantly contribute to soft physics at the LHC. A similar conclusion can also be reached in the framework of non-linear approaches to unitarisation of the BFKL pomeron. [less ▲]

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See detailGeneralized parton distributions of the pion
Bissey, F.; Cudell, Jean-René ULg; Cugnon, Joseph ULg et al

in Nuclear Physics B-Proceedings Supplements (2004, July), 133

Off-forward structure functions of the pion are investigated in twist-two and twist-three approximation. A simple model is used for the pion, which allows to introduce finite size effects, while ... [more ▼]

Off-forward structure functions of the pion are investigated in twist-two and twist-three approximation. A simple model is used for the pion, which allows to introduce finite size effects, while preserving gauge invariance. Results for the imaginary parts of the gamma*pi --> gamma*pi off-forward amplitude and of the structure functions are presented. Generalized Callan-Gross relations are obtained. [less ▲]

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