Drell-Yan production with the CCFM-K evolution

We discuss the Drell-Yan dilepton production using the transverse momentum dependent parton distributions evolved with the Catani-Ciafaloni-Fiorani-Marchesini-Kwieci\'nski (CCFM-K) equations in the single loop approximation. Such equations are obtained assuming angular ordering of emitted partons (coherence) for $x\sim 1$ and transverse momentum ordering for $x \ll 1$. This evolution scheme also contains the Collins-Soper-Sterman (CSS) soft gluon resummation. We make a comparison with a broad class of data on transverse momentum spectra of low mass Drell-Yan dileptons.Comment: 29 pages, 9 figure

Initial conditions for evolution of double parton distributions

Double parton distribution functions (DPDFs) are used in the QCD description of double parton scattering. The DPDFs evolve with hard scales through relatively new QCD evolution equations which obey nontrivial momentum and valence quark number sum rules. Based on the constructed numerical program, we present results on the QCD evolution of the DPDFs. In particular, we discuss the problem how to specify initial conditions for the evolution equations which exactly fulfill the sum rules.Comment: presented at DIS2013 at Marseilles, France, 22-26 April, 2013, one reference adde

Unintegrated Double Parton Distributions - a Summary

We present main elements of the construction of unintegrated double parton distribution functions which depend on transverse momenta of partons. We follow the method proposed by Kimber, Martin and Ryskin for a construction of unintegrated single parton distributions from the standard parton distribution functions.Comment: presented at "Diffraction 2016", International Workshop on Diffraction in High Energy Physics, Acireale (Catania, Sicily), Sept 2-8 2016, to be published in the conference proceedings by AI

Saturation model of DIS : an update

We present the results of new fits to the recently extracted data on $F_2$ at low $x$ with the GBW saturation model and its modification to cover high values of $Q^2$. We find that the model stands the test of time and gives a good description of the data with slightly modified parameters. All the essential elements of the model, especially the saturation scale, are retained.Comment: 16 pages, 8 figures; v2: several textual changes and additions, Table 2 added, version accepted by JHEP; v3: misprint correcte

Theoretical concepts of parton saturation - from HERA to LHC

We present a short summary of parton saturation concepts as seen in deep inelastic scattering.Comment: Prepared for 38th International Symposium on Multiparticle Dynamics (ISMD08), DESY Hamburg, Germany, 15-20 Sep 200

Forward Drell-Yan and backward jet production as a probe of the BFKL dynamics

We propose a new process which probes the BFKL dynamics in the high energy proton-proton scattering, namely the forward Drell-Yan (DY) production accompanied by a backward jet, separated from the DY lepton pair by a large rapidity interval. The proposed process probes higher rapidity differences and smaller transverse momenta than in the Mueller-Navelet jet production. It also offers a possibility of measuring new observables like leptons angular distribution coefficients in the DY lepton pair plus jet production.Comment: 23 pages, 8 figure