Antoni Szczurek

Off-shell amplitudes and 4-jet production in

We compute tree level QCD scattering amplitudes in the

k_T

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-factorization

-factorization approach, which implies that incoming partons are off the mass-shell. To do that, we use a generalisation of the Britto-Cachazo-Feng-Witten (BCFW) recursion relation, which works, in principle, for any number of legs; we then use these results to perform a study of both Single (SPS) and Double Parton Scattering contributions (DPS) to the inclusive 4-jet production in the

Photoproduction of J/ψ with and without proton dissociation

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Recent progress in some exclusive and semi-exclusive processes in proton-proton collisions

-factorization framework at leading order and center of mass energies

Inclusive production of J/ψ and ψ′ mesons at the LHC

\sqrt{s}= 7

Inclusive production of J/ψandψ′ mesons at the LHC

TeV and

Diffractive production of open charm and bottom at the LHC

13

Exclusive production of vector mesons in pp and pp̄ collisions

TeV. We discuss the importance of double parton scattering for relatively soft cuts on the jet transverse momenta and find out that symmetric cuts do not suit well the

Production of

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