Daniele Treleani

The double parton distributions in the hard pomeron model

Abstract. We study the double parton interaction process in collisions between highly virtual

Finite formation time effects in inclusive and semi-inclusive electro-disintegration of few-body nuclei ∗

q{bar q}

Realistic study of the nuclear transparency and the distorted momentum distributions in the semi-inclusive process4He(e,e′p)X

pairs in the BFKL regime. Explicit expressions for the double parton distributions are obtained both in the case of direct coupling of the BFKL pomerons to the

Finite formation time effects in quasi-elastic (e,e ' ) scattering on nuclear targets

q{bar q}

The \(n\)-jet inclusive cross-section in the Hard Pomeron model

pair and in the case of triple pomeron interaction.

FINAL STATE INTERACTION IN INCLUSIVE AND EXCLUSIVE QUASI-ELASTIC PROCESSES

, due to the factthat the hit nucleon need a Finite Formation Time (FFT) to reach its asymptotic form,the interaction with the remainder of the target nucleus becomes very weak and vanishesin the asymptotic limit. In this contribution, we present the results of a calculation basedupon the extension of the method of [1] to the exclusive,

Sixth international conference on perspectives in hadronic physics, Trieste, Italy, 12-16 May 2008

The nuclear transparency and the distorted momentum distributions of 4He in the semi-inclusive process 4He(e,ep)X are calculated within the Glauber multiple scattering approach using for the first time realistic four-body variational wave functions embodying central and non-central nucleon-nucleon (N-N) correlations. The contributions from N-N correlations and from Glauber multiple scattering are taken into account exactly to all orders. It is shown that non-central correlations significantly affect both the transparency and the distorted momentum distributions; as a matter of fact: i) the small (approx 3%) value of the effect of correlations on the transparency results from an appreciable cancellation between the short-range central repulsive correlations and the intermediate-range attractive correlations, whose magnitude is significantly affected by the non-central forces, and ii) the effect of Glauber final state interactions on the momentum distribution is reduced by the inclusion of tensor correlations.

Sixth International Conference on Perspectives in Hadronic Physics

The problem of the final state interaction, in quasi-elastic (e,e ′ ) scattering at large Q 2 , is investigated by exploiting the idea that the ejected nucleon needs a finite amount of time to assume its asymptotic form. It is shown that when the dependence of the scattering amplitude of the ejected nucleon on its virtuality is taken into account, the final state interaction is decreased. The developed approach is simpler to implement than the one based on the color transparency description of the damping of the final state interaction, and is essentially equivalent to the latter in the case of the single rescattering term. The (e,e ′ ) process on the deuteron is numerically investigated and it is shown that, at x = 1, appreciable finite formation time effects at Q 2 of the order of 10 (GeV/c) 2 are expected.

Back Matter for Volume 1056

Abstract. The inclusive production of several jets is studied in the framework of the hard pomeron model. The average jet momenta are found to be strongly ordered and growing towards the central c.m. rapidity, as expected. Strong positive correlations are found for pairs of jets neighbouring in rapidity, both in the forward-backward and forward-forward directions.n

Front Matter for Volume 1056

are characterized by the large virtuality of the ejected nucleon. A straight-forward way to incorporate virtuality effects in the process is through theFeynman diagrams formalism[1]. The amplitude describing n consecutiverescattering of the ejectile emerging from the interaction of the struck nucleonwith the incoming virtual photon, is represented in the diagram in Fig.1. TheGlauber expression of the FSI may be obtained from the amplitude of the pro-cess in momentum space, obtained by the diagram, by applying the followingprocedure: one should first take the residues of the target nucleons propaga-tors, to make the energy integrals of the loop variables. Then, while taking theFourier transform to go to the coordinates representation, one should makethe further approximations of i) disregarding the propagators of the ejected