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Charge splitting of directed flow and space-time picture of pion emission from the electromagnetic interactions with spectatorsMay 27 2014We estimate the effect of the spectator-induced electromagnetic interaction on the directed flow of charged pions. For intermediate centrality Au+Au collisions at $\sqrt{s_{NN}}=7.7$~GeV, we demonstrate that the electromagnetic interaction between spectator ... More

Photon induced processes in semi-central nucleus-nucleus collisionsMar 14 2019We calculate total and differential cross sections for $J/\psi$ photoproduction in ultrarelativistic lead-lead collisions at the LHC energy $\sqrt{s_{NN}}=2.76$ TeV. We use a simple model based on vector dominance picture and multiple scattering of the ... More

A hybrid model for $γ^* p$ scattering at small Bjorken-xSep 12 2003We extend the dipole model for virtual photon - proton scattering to include the resolved photon component explicitly. The parameters of the resolved photon component are taken from the literature, while the parameters of the dipole-nucleon interaction ... More

Double parton scattering at high energiesApr 24 2015We discuss a few examples of rich newly developing field of double parton scattering. We start our presentation from production of two pairs of charm quark-antiquark and argue that it is the golden reaction to study the double parton scattering effects. ... More

New mechanisms of charm productionApr 12 2012We discuss production of charm quarks, mesons as well as nonphotonic electrons in $pp$ scattering at RHIC. The distributions in rapidity and transverse momentum of charm and bottom quarks/antiquarks are calculated in the $k_t$-factorization approach. ... More

Diffractive pQCD mechanisms of exclusive production of $b \bar b$ dijets and $W^+ W^-$ pairs in proton-proton collisionsJun 01 2012We discuss central exclusive production of $W^+W^-$ pairs in proton-proton collisions at LHC. Predictions for the total cross section and differential distributions in transverse momentum of $W^{\pm}$ and $WW$ invariant mass are presented. We discuss ... More

On the range of validity of the parton modelJun 28 2000Based on the world DIS data we extract $F_2^p - F_2^n$ as a function of Bjorken $x$ and photon virtuality $Q^2$. The standard PDFs fail to describe the experimental data below $Q^2 <$ 7 GeV$^2$. The trend of the data is approximately explained by our ... More

A short review of some double-parton scattering processesMay 15 2015May 19 2015A few examples of quickly developing field of double parton scattering are discussed. We present arguments that the production of two pairs of charm quark-antiquark is the golden reaction to study the double parton scattering effects. We discuss briefly ... More

Production of $c \bar c$ pairs at LHC: $k_t$-factorization and double-parton scatteringJun 01 2012We discuss charm production at LHC. The production of single $c \bar c$ pairs is calculated in the $k_t$-factorization approach. We use several unintegrated gluon distributions from the literature. Differential distributions for several charmed mesons ... More

Central exclusive production at high energiesApr 09 2009I briefly review several mechanisms of central exclusive production of mesons at high energies. Some illustrative examples for the BNL RHIC, FNAL Tevatron and CERN LHC as well as for lower energies are discussed. Some differential distributions are shown. ... More

Exclusive Production of Quarkonia in $pp$ and $p \bar p$ Collisions Far from the ThresholdMay 03 2008I discuss exclusive production of the $\eta'$, $J/\psi$, and $\chi_c(0^+)$ mesons in $pp$ and $p \bar p$ collisions at high energies. QCD diffractive mechanisms as well as nondiffractive mechanisms are discussed. Different unintegrated gluon distribution ... More

Diffractive production of quarkoniaSep 03 2007I discuss two selected examples of diffractive production of quarkonia: $p p \to p \eta' p$ and $p p \to p J/\psi p$. In the first case I consider diffractive pQCD approach and $\gamma \gamma$ fusion, in the second case the amplitude is linked to the ... More

$η'$ production in proton-proton collisions far from the thresholdSep 03 2007I discuss exclusive production of the $\eta'$ meson in the $pp \to p\eta'p$ reaction far from the threshold. The contribution of diffractive component as well as that for $\gamma^* \gamma^* \to \eta'$ fusion are calculated. In the first case the formalism ... More

New vistas in charm productionNov 29 2018We discuss some new aspects of charm production trigerred by recent observations of the LHCb collaboration. The LHCb collaboration measured small asymmetries in production of $D^+ D^-$ mesons as well as $D_s^+ D_s^-$ mesons. Is this related to initial ... More

Diffractive Double-Elastic Production of $η$' and $η_c$ in the $p p \to p X p$ ReactionAug 30 2006I discuss double-diffractive (double-elastic) production of the $\eta'$ and $\eta_c$ mesons in the $pp \to p X p$ reaction within the formalism of unintegrated gluon distribution functions (UGDF). The contribution of $\gamma^* \gamma^* \to \eta'$ fusion ... More

Recent theoretical results for electromagnetically induced ultraperipheral reactions of heavy ionsOct 15 2018We briefly review our works on ultraperipheral heavy ion collisions. We discuss both $\gamma \gamma$ and rescattering of hadronic photon fluctuation induced by one nucleus in the collision partner. Production of one and two leptonic and pionic and $p ... More

Higgs production within $k_t$-factorization with unintegrated gluon distributionsOct 13 2015We present differential cross sections for Higgs boson and/or two-photon production from intermediate (virtual) Higgs boson within the formalism of $k_t$-factorization. Resulting distributions for two photons from the Higgs boson are compared with recent ... More

Unintegrated parton distributions and pion production in $pp$ collisions at SPS and RHIC energiesSep 27 2005Oct 20 2005Inclusive cross sections for pion production in $pp$ collisions are calculated for the first time fully based on unintegrated gluon, quark and antiquark distributions (uPDF). We use recently developed Kwieci\'nski uPDF's and different phenomenological ... More

Unintegrated parton distributions and particle production in hadronic collisionsNov 13 2003The inclusive distributions of gluons and pions for high-energy NN collisions are calculated. The results for several unintegrated gluon distributions (UGD's) from the literature are compared. We find huge differences in both rapidity and $p_t$ of gluons ... More

From unintegrated gluon distributions to particle production in nucleon-nucleon collisions at RHIC energiesApr 14 2003The inclusive distributions of gluons and pions are calculated with absolute normalization for high-energy nucleon-nucleon collisions. The results for several unintegrated gluon distributions from the literature are compared. The gluon distribution proposed ... More

Exploring double-parton scattering effects for jets with large rapidity separation and in four-jet production at the LHCSep 25 2015We present an estimation of the contribution of double parton scattering (DPS) for jets widely separated in rapidity and for four-jet sample. In the case of four-jet production we calculate cross section for both single-parton scattering (SPS) using the ... More

Diffractive exclusive production of Higgs boson and heavy quark pairs at high energy proton-proton collisionsNov 30 2010We discuss exclusive double diffractive (EDD) production of Higgs boson and heavy quark - heavy antiquark pairs at high energies. Differential distributions for $c \bar c$ at $\sqrt{s}$ = 1.96 GeV and for $b \bar b$ at $\sqrt{s}$ = 14 TeV are shown and ... More

Central production of gluonic and quark-antiquark dijets and background to central production of Higgs bosonNov 03 2011We discuss exclusive central production of Higgs boson, quark-antiquark and digluon dijets. Several differential distributions are shown and disussed. Irreducible leading-order $b \bar b $ background to Higgs production is calculated in several kinematical ... More

Mechanisms of exclusive meson production at high energiesNov 15 2008I discuss mechanisms of exclusive production of mesons at high energies. Some illustrative examples for the FNAL Tevatron and CERN LHC as well as for lower energies are shown.

From unintegrated gluon distributions to particle production in hadronic collisions at high energiesSep 12 2003The inclusive distributions of gluons and pions for high-energy NN collisions are calculated. The results for several unintegrated gluon distributions (UGD's) from the literature are compared. We find huge differences in both rapidity and $p_t$ of gluons ... More

Production of digluon and quark-antiquark dijets in central exclusive processesApr 02 2012We discuss exclusive central production of Higgs boson, quark-antiquark and digluon dijets. Some differential distributions are shown and disussed. Irreducible leading-order $b \bar b $ background to Higgs production is calculated. The signal-to-background ... More

Heavy quark production at collider energies: some selected topicsDec 09 2011We discuss production of charm quarks and mesons as well as nonphotonic electrons in $pp$ scattering at RHIC. The distributions in rapidity and transverse momentum of charm and bottom quarks/antiquarks are calculated in the $k_t$-factorization approach. ... More

Central meson production in diffractive reactionsNov 06 2006I discuss double-diffractive (double-elastic) production of the $\eta'$ and $\eta_c$ mesons in the $pp \to p X p$ reaction within the formalism of unintegrated gluon distribution functions (UGDF). The contribution of $\gamma^* \gamma^* \to \eta'$ fusion ... More

Peripheral, ultrarelativistic production of particles in heavy ion collisionsApr 03 2014The cross sections for the production of two-pions in ultraperipheral ultrarelativistic heavy ion collisions, calculated in the impact parameter Equivalent Photon Approximation (EPA), are presented. Differential distributions in impact parameter, dipion ... More

Exclusive production of lepton, quark and meson pairs in peripheral ultrarelativistic heavy ion collisionsAug 19 2011We discuss exclusive production of lepton-antilepton, quark-antiquark, $\pi \pi$ and $\rho^0 \rho^0$ pairs in ultraperipheral, ultrarelativistic heavy-ion collisions. The cross sections for exclusive production of pairs of particles is calculated in Equivalent ... More

Exclusive Processes at CollidersSep 25 2009A few examples of exclusive processes at high energy are discussed. Several mechanisms are presented. The differential distributions are shown. The possibilities to measure the processes are discussed.

Kinematical correlations: from RHIC to LHCOct 14 2008Kinematical correlations between outgoing partons (elementary particles) are discussed in the framework of $k_t$-factorization. Different unintegrated gluon distributions are used. I discuss correlations between charm-anticharm, jets, photon and jet, ... More

Diffractive production of charm quark/antiquark pairs at RHIC and LHCDec 21 2012We have discussed single and central diffractive production of $c \bar c$ pairs in the Ingelman-Schlein model. In these calculations we have included diffractive parton distributions obtained by the H1 collaboration at HERA and absorption effects neglected ... More

Diffractive production of heavy mesons at the LHC within $k_t$ - factorization approachJun 30 2016We discuss diffractive production of heavy mesons at the LHC. The differential cross sections for single- and central-diffractive mechanisms for $c\bar c$ pair production are calculated in the framework of the Ingelman-Schlein model corrected for absorption ... More

Consistent treatment of charm production in higher-orders at tree-level within $k_T$-factorization approachMay 16 2019We discuss production of $c \bar c$-pairs within $k_T$-factorization approach (off-shell initial partons) with unintegrated parton distribution functions (uPDFs). We present a consistent prescription which merges the standard leading-order (LO) $k_T$-factorization ... More

Inclusive photon production and photon-jet correlations in hadronic collisionsJan 02 2008We compare results of $k_t$-factorization approach and next-to-leading order collinear-factorization approach for photon-jet correlations in $pp$ and $p \bar p$ collisions at RHIC, Tevatron and LHC energies. We discuss correlations in azimuthal angle ... More

Four-jet production in the $k_t$-factorisationOct 17 2016We discuss the single-parton and double-parton scattering (SPS or DPS) effects in four-jet production at the LHC. The calculations of both single-parton and double-parton scattering components are done in the high-energy (or $k_{T}$)-factorization approach. ... More

Double charm production in single- and double-parton scatteringOct 13 2015We discuss production of two pairs of $c \bar c$ in proton-proton collisions at the LHC. Both double-parton scattering (DPS) and single-parton scattering (SPS) contributions are included in the analysis. Each step of DPS is calculated within $k_t$-factorization ... More

Exclusive production of pi+ pi- pairs in proton-proton and proton-antiproton collisionsAug 26 2010We report on a detailed investigation of four-body $p p \to p p \pi^+ \pi^-$ and $p \bar{p} \to p \bar{p} \pi^+ \pi^-$) reactions which constitute an irreducible background to three-body processes $p p \to p p M$, where $M$ is a broad resonance in the ... More

Unintegrated parton distributions and pion production in pp collisions at RHIC's energiesOct 03 2005We compare results of $2 \to 1$ $k_t$-factorization approach with Kwieci\'nski unintegrated parton distributions and the standard collinear factorization approach at RHIC and slightly smaller energies. Our approach contains only one free parameter responsible ... More

Unintegrated parton distributions and meson production in hadronic collisionsJun 21 2004The inclusive distributions of gluons and pions for high-energy NN collisions are calculated. The results for several unintegrated gluon distributions (UGD's) from the literature are compared. We find huge differences in both rapidity and $p_t$ of gluons ... More

The role of meson exchanges in light-by-light scatteringMay 18 2017We discuss the role of meson exchange mechanisms in $\gamma \gamma \to \gamma \gamma$ scattering. Several pseudoscalar ($\pi^0$, $\eta$, $\eta'(958)$, $\eta_c(1S)$, $\eta_c(2S)$), scalar ($f_{0}(500)$, $f_0(980)$, $a_0(980)$, $f_0(1370)$, $\chi_{c0}(1P)$) ... More

Production of two $c \bar c$ pairs in double-parton scattering within $k_t$-factorizationJun 28 2013We discuss production of two pairs of $c \bar c$ in proton-proton collisions at the LHC. Both double-parton scattering (DPS) and single-parton scattering (SPS) contributions are included in the analysis. Each step of DPS is calculated within $k_t$-factorization ... More

Spectator induced electromagnetic effect on directed flow in heavy ion collisionsMar 29 2013We estimate the electromagnetic effect of the spectator charge on azimuthal anisotropies observed in heavy ion collisions. For peripheral Pb+Pb reactions at the top energy of the CERN Super Proton Synchrotron, $\sqrt{s_{NN}}=17.3$ GeV, we predict this ... More

Exclusive $p p \to p p π^{0}$ reaction at high energiesMar 12 2013Apr 18 2013The amplitudes for the $p p \to p p \pi^{0}$ process applicable at high energy are discussed in detail. Both diffractive bremsstrahlung (Drell-Hiida-Deck--type model), photon-photon and photon-omega exchange mechanisms are included in the calculation. ... More

Production of $c \bar c c \bar c$ in double-parton scattering within $k_{t}$-factorization approach -- meson-meson correlationsJan 18 2013We discuss production of two pairs of $c \bar c$ in proton-proton collisions at the LHC. Both double-parton scattering (DPS) and single-parton scattering (SPS) contributions are included in the analysis. Each step of DPS is calculated within $k_t$-factorization ... More

Exclusive meson pair production in proton-proton collisionsAug 21 2012We present a study of the exclusive production of meson pairs in the four-body $pp \to pp \pi^{+} \pi^{-}$, $pp K^{+}K^{-}$ reactions at high energies which constitute an irreducible background to resonance states (e.g. $\phi$, $f_{2}(1270)$, $f_{0}(1500)$, ... More

Exclusive scalar glueball $f_0(1500)$ production for FAIR and J-PARC energy rangeJun 30 2008We evaluate differential distributions for exclusive scalar $f_0(1500)$ production for $p \bar p \to N_1 N_2 f_0$ (FAIR@GSI) and $p p \to p p f_0$ (J-PARC@Tokai). Both QCD diffractive and pion-pion meson exchange current (MEC) components are included. ... More

Double-parton scattering effects in $D^{0}B^{+}$ and $B^{+}B^{+}$ meson-meson pair production in proton-proton collisions at the LHCMar 03 2018We extend our previous studies of double-parton scattering (DPS) to simultaneous production of $c \bar c$ and $b \bar b$ and production of two pairs of $b \bar b$. The calculation is performed within factorized ansatz. Each parton scattering is calculated ... More

Low mass Drell-Yan production of lepton pairs at forward directions at the LHC: a hybrid approachFeb 22 2016Feb 29 2016We discuss Drell-Yan production of dileptons at high energies in forward rapidity region in a hybrid high-energy approach. This approach uses unintegrated gluon distributions in one proton and collinear quark/antiquark distributions in the second proton. ... More

Exclusive diffractive photon bremsstrahlung at the LHCFeb 18 2013We calculate differential distributions for the $p p \to p p \gamma$ reaction at the LHC energy $\sqrt{s} = 14$ TeV. We consider diffractive classical bremsstrahlung mechanisms including effects of non point-like nature of protons. In addition, we take ... More

Fermi motion and nuclear modification factorNov 07 2003Jun 21 2004It has been argued recently that the so-called nuclear modification factor ($R_{AA}$) is an observable useful for identifying the quark-gluon plasma. We discuss the effect of Fermi motion in nuclei on $R_{AA}$ at CERN SPS and BNL RHIC energies. Contrary ... More

Exclusive $D \bar D$ meson pair production in peripheral ultrarelativistic heavy ion collisionsMar 22 2011The cross sections for exclusive $D^+D^-$ and $D^0 \bar {D^0}$ meson pair production in peripheral nucleus - nucleus collisions are calculated and several differential distributions are presented. The calculation of the elementary $\gamma \gamma \to D ... More

Parton transverse momenta and Drell-Yan dilepton productionAug 11 2008Nov 14 2008The differential cross section for the dilepton production is calculated including Fermi motion of hadron constituents as well as emission from the ladders in the formalism of unintegrated parton distributions. We use unintegrated parton distributions ... More

$π^+ - π^-$ Asymmetry and the Neutron Skin in Heavy NucleiSep 17 2004In heavy nuclei the spatial distribution of protons and neutrons is different. At CERN SPS energies production of $\pi^+$ and $\pi^-$ differs for $pp$, $pn$, $np$ and $nn$ scattering. These two facts lead to an impact parameter dependence of the $\pi^+$ ... More

Neutron halo and the impact-parameter dependence of the $π^+ - π^-$ asymmetry in heavy ion collisionsFeb 10 2004The theoretical nuclear physics predictions and experimental results on antiprotonic atoms lead to different proton and neutron spatial distributions. At CERN SPS energies production of positive and negative pions differs for $pp$, $pn$, $np$ and $nn$ ... More

Double-parton scattering effects in double charm production within gluon fragmentation scenarioOct 17 2016We discuss charm $D^0 D^0$ meson-meson pair production in the forward rapidity region related to the LHCb experimental studies at $\sqrt{s}$ = 7 TeV. We consider double-parton scattering mechanisms of double $c \bar c$ production and subsequent standard ... More

Forward production of Drell-Yan dileptons at high energies and low dilepton invariant masses in a $k_t$-factorization approach: Do we see onset of saturation?Jul 01 2016We discuss Drell-Yan production of dileptons at high energies in forward rapidity region in a hybrid high-energy approach. This approach uses unintegrated gluon distributions in one proton and collinear quark/antiquark distributions in the second proton. ... More

Revision of absorption corrections for the $p p \to p p π^{+} π^{-}$ processApr 28 2015May 11 2015We include new additional absorption corrections into the Lebiedowicz-Szczurek (non-resonant) model for $p p \to p p \pi^+ \pi^-$ or $p \bar p \to p \bar p \pi^+ \pi^-$ processes. They are related to the $\pi N$ nonperturbative interaction in the final ... More

Exclusive production of heavy charged Higgs boson pairs in the $p p \to p p H^+ H^-$ reaction at the LHC and a future circular colliderFeb 11 2015Apr 23 2015We calculate differential cross sections for exclusive production of heavy charged scalar, weakly interacting particles (charged Higgs bosons, charged technipions, etc.) via photon-photon exchanges in the $p p \to p p H^+ H^-$ reaction with exact $2 \to ... More

Production of one and two $c \bar c$ pairs at LHCDec 21 2012We report on charm production at LHC. The production of single $c \bar c$ pairs is calculated in the $k_t$-factorization approach with different unintegrated gluon distributions. Examples of transverse momentum distributions for charmed mesons are presented ... More

$pp \to pp K^{+}K^{-}$ reaction at high energiesOct 21 2011Nov 11 2011We evaluate differential distributions for the four-body $p p \to p p K^{+} K^{-}$ reaction at high energies which constitutes an irreducible background to three-body processes $p p \to p p M$, where $M=\phi$, $f_{2}(1275)$, $f_{0}(1500)$, $f_{2}'(1525)$, ... More

Inclusive and exclusive diffractive production of dilepton pairs in proton-proton collisions at high energiesMar 31 2011We calculate for the first time cross sections for single and central diffractive as well as exclusive diffractive production of dilepton pairs in proton-proton collisions. Several differential distributions are shown. The inclusive diffractive processes ... More

Exclusive $pp \to nn π^{+}π^{+}$ reaction at LHC and RHICMay 13 2010Mar 29 2011We evaluate differential distributions for the four-body $p p \to n n \pi^+ \pi^+$ reaction. The amplitude for the process is calculated in the Regge approach including many diagrams. We make predictions for possible future experiments at RHIC and LHC ... More

$D \bar D$ asymmetry at low and high energies and possible consequences for prompt atmospheric neutrinosMar 22 2018We discuss the role of unfavoured light quark/antiquark to $D$ meson fragmentation. The unknown parameters of fragmentation process are adjusted to describe the asymmetry for $D^+$ and $D^-$ production measured by the LHCb. Predictions for similar asymmetry ... More

Production of $Λ_c$ baryons at the LHC within the $k_T$-factorization approach and independent parton fragmentation pictureMar 15 2018We calculate cross section for production of $D$ mesons and $\Lambda_c$ baryons in proton-proton collisions at the LHC. The cross section for production of $c \bar c$ pairs is calculated within $k_T$-factorization approach with the Kimber-Martin-Ryskin ... More

Diffractive mechanisms in $pp \to pp π^{0}$ reaction at high energiesJun 28 2013We present a study of exclusive production of $\pi^{0}$ meson in proton-proton collisions at high energies. Both diffractive bremsstrahlung (Drell-Hiida-Deck type model), photon-photon, photon-omega and photon-odderon exchange mechanisms are included ... More

Unintegrated gluon distributions and Higgs boson production in proton-proton collisionsApr 14 2005Jan 03 2006Inclusive cross sections for Higgs boson production in proton-proton collisions are calculated in the formalism of unintegrated gluon distributions (UGDF). Different UGDF from the literature are used. Although they were constructed in order to describe ... More

Charm quark and meson production in association with single-jet at the LHCOct 06 2016We discuss charm quark/antiquark and charmed meson production in association with one extra jet (gluon, quark, antiquark) at the LHC. The calculations are performed both in collinear and $k_T$-factorization approaches. Different unintegrated gluon distribution ... More

Production of charged Higgs boson pairs in the $pp \to ppH^{+}H^{-}$ reaction at the LHC and FCCOct 01 2015We present differential cross sections for the $pp \to ppH^{+}H^{-}$ reaction via photon-photon fusion with exact kinematics. We show predictions for $\sqrt{s}$ = 14 TeV (LHC) and at the Future Circular Collider (FCC) for $\sqrt{s}$ = 100 TeV. The integrated ... More

Double-parton scattering contribution to production of jet pairs with large rapidity separation at the LHCMar 11 2014We discuss production of four-jet final state $pp \rightarrow j j j j X$ in proton-proton collisions at the LHC through the mechanism of double-parton scattering (DPS) in the context of jets with large rapidity separation. The DPS contributions are calculated ... More

Exclusive $pp \to pp π^{+}π^{-}$ reaction: from the threshold to LHCDec 01 2009We evaluate differential distributions for the four-body $p p \to p p \pi^+ \pi^-$ reaction which constitutes a irreducible background to three-body processes $p p \to p p M$, where $M$ are a broad resonances in the $\pi^+ \pi^-$ channel, e.g. $M=\sigma, ... More

Production of charmed meson-meson pairs at the LHC: Single- versus double-parton scattering mechanismsOct 20 2014Oct 23 2014We discuss hadroproduction of open charmed mesons ($D^0$, $D^{\pm}$, $D^{\pm}_{S}$) at the LHC energy $\sqrt{s} = 7$ TeV. The cross section for inclusive production of $c \bar c$ pairs is calculated within the $k_{\perp}$-factorization (or high-energy ... More

Production of dijets with large rapidity separation: Mueller-Navelet mechanism versus double-parton scatteringJul 11 2014We discuss hadroproduction of 4-jet final state at the LHC within the double-parton scattering (DPS) mechanism in the context of large-rapidity-distance jets. For planned and/or being currently performed high energy experiments this is the kinematical ... More

Exclusive production of meson pairs and resonances in proton-proton collisionsDec 01 2012We report a study of the central exclusive production of $\pi^{+} \pi^{-}$ and $K^{+}K^{-}$ pairs in high energy hadron-hadron collisions. The amplitude is calculated in the Regge approach including both pomeron and secondary reggeon exchanges and absorption ... More

Exclusive scalar $f_0(1500)$ meson productionJun 10 2012We evaluate differential distributions for exclusive scalar $f_0(1500)$ meson (glueball candidate) production. Both QCD diffractive, pion-pion meson exchange current (MEC) components as well as double-diffractive mechanism with intermediate pionic loop ... More

Associated production of $D$-mesons with jets at the LHCOct 31 2017We present several differential distributions for the associated production of charm and dijets. Both single-parton scattering (SPS) and double-parton scattering (DPS) contributions are calculated in the $k_T$-factorization approach. We have found regions ... More

Pion and Kaon Production in Nucleon - Nucleon CollisionsAug 28 2006Inclusive cross section for pion production in proton - proton collisions are calculated based on unintegrated parton distribution functions (uPDFs). In addition to purely gluonic terms the present approach includes also quark degrees of freedom. Phenomenological ... More

Charmed Meson Production in Proton - (ANTI)PROTON CollisionsAug 18 2006We discuss and compare different approaches to include gluon transverse momenta for heavy quark-antiquark pair and meson production. The results are illustrated with the help of different unintegrated gluon distributions (UGDF) from the literature. We ... More

Resolved photon and multi-component model for $γ^*$p and $γ^* γ^*$ scattering at high energiesApr 15 2005We generalize our previous model for $\gamma^* p$ scattering to $\gamma \gamma$ scattering. In the latter case the number of components naturally grows. When using the model parameters from our previous $\gamma^* p$ analysis the model cross section for ... More

Single-diffractive dijet production at high energies within the $k_t$ -factorization approachOct 31 2017We discuss single-diffractive production of dijets. The cross section is calculated for the first time in the $k_t$-factorization approach, neglecting transverse momentum of the pomeron. We use Kimber-Martin-Ryskin unintegrated parton (gluon, quark, antiquark) ... More

Diffractive processes at the LHC within $k_t$ -factorization approachOct 19 2016We discuss the single diffractive production of $c \bar c$ pairs and charmed mesons at the LHC. In addition to standard collinear approach, for a first time we propose a $k_t$-factorization approach to the diffractive processes. The transverse momentum ... More

Subleading processes in production of $W^+ W^-$ pairs in proton-proton collisionsSep 27 2013Oct 03 2013We discuss many new subleading processes for inclusive production of $W^+ W^-$ pairs not included in the literature so far. We focus on photon-photon induced processes. We include elastic-elastic, elastic-inelastic, inelastic-elastic and inelastic-inelastic ... More

Charmed mesons and leptons from semileptonic decays at the LHCJun 28 2013We discuss production of charmed mesons as well as electrons/muons from semileptonic decays of charm and bottom mesons in proton-proton collisions at the LHC. The cross section for inclusive production of $c \bar c$ and $b \bar b$ pairs is calculated ... More

Open charm production at the LHC - $k_{t}$-factorization approachJan 14 2013We discuss inclusive production of open charm in proton-proton scattering at LHC. The calculation is performed within the $k_t$-factorization approach. Different models of unintegrated gluon distributions (UGDF) from the literature are used. The theoretical ... More

Production of two $c \bar c$ pairs in gluon-gluon scattering in high energy proton-proton collisionsMar 19 2012We calculate cross sections for $g g \to Q \bar Q Q \bar Q$ in the high-energy approximation in the mixed (longitudinal momentum fraction, impact parameter) and momentum space representations. Besides the total cross section as a function of subsystem ... More

Exclusive and semiexclusive production of $μ^+ μ^-$ pairs with $Δ$ isobars and other resonances in the final state and the size of absorption effectsJul 16 2018Sep 19 2018We include $p p \to p \Delta^{+} \mu^{+} \mu^{-}$ and $p p \to \Delta^{+} \Delta^{+} \mu^{+} \mu^{-}$ processes in addition to the standard $p p \to p p \mu^{+} \mu^{-}$ process both in equivalent-photon approximation (EPA) and in exact $2 \to 4$ calculations. ... More

Prompt inclusive production of $J/ψ$, $ψ'$ and $χ_{c}$ mesons at the LHC in forward directions within the NRQCD $k_t$-factorization approach - search for the onset of gluon saturationDec 21 2017We discuss prompt production of $J/\psi$ mesons in proton-proton collisions at the LHC within NRQCD $k_t$-factorization approach using Kimber-Martin-Ryskin (KMR) unintegrated gluon distributions (UGDF). We include both direct color-singlet production ... More

D meson production asymmetry, unfavoured fragmentation and consequences for prompt atmospheric neutrino productionNov 23 2017Jan 09 2018We consider unfavoured light quark/antiquark to $D$ meson fragmentation. We discuss nonperturbative effects for small transverse momenta. The asymmetry for $D^+$ and $D^-$ production measured by the LHCb collaboration provides natural constraints on the ... More

Photon-jet correlations in $pp$ and $p \bar p$ collisionsApr 17 2007Apr 20 2007We compare results of the $k_t$-factorization approach and the next-to-leading order collinear-factorization approach for photon-jet correlations in $pp$ and $p \bar p$ collisions at RHIC and Tevatron energies. We discuss correlations in the azimuthal ... More

The Spectator Electromagnetic Effect on Charged Pion Spectra in Peripheral Ultrarelativistic Heavy-Ion CollisionsOct 10 2006We estimate the electromagnetic effect of the spectator charge on the momentum spectra of $\pi^+$ and $\pi^-$ produced in peripheral Pb+Pb collisions at SPS energies. We find that the effect is large and results in strongly varying structures in the $x_F$ ... More

Direct Photon Production in $pp$ and $p \bar p$ Collisions at High EnergiesAug 17 2006The invariant cross sections for direct photon production in hadron-hadron collisions are calculated for several initial energies (SPS, ISR, S$p \bar p$S, RHIC, Tevatron, LHC) including initial parton transverse momenta within the formalism of unintegrated ... More

Charm-Anticharm Kinematical Correlations in Photon-Proton ScatteringAug 04 2004$c-\bar c$ correlations are calculated in the $k_t$-factorization approach. Different unintegrated gluon distributions (uGDF) from the literature are used. The results are compared with recent results of the FOCUS collaboration. The recently developed ... More

Double-parton scattering effects in associated production of charm mesons and dijets at the LHCJul 26 2017We calculate several differential distributions for the production of charm and dijets. Both single-parton scattering (SPS) and double-parton scattering (DPS) contributions are calculated in the $k_T$-factorization approach. The Kimber-Martin-Ryskin unintegrated ... More

Inclusive production of J/$ψ$ and $ψ'$ mesons at the LHCSep 27 2016We discuss the prompt production of $J/\psi$ mesons in proton-proton collisions at the LHC within a NRQCD $k_{t}$-factorization approach using Kimber-Martin-Ryskin (KMR) unintegrated gluon distributions (UGDF). We include both direct color-singlet production ... More

Search for walking technipion in four-jet sampleJul 15 2016We discuss how to search for a possibe signal of the recently observed 750 GeV enhancement in the diphoton channel in the four-jet production. In the present studies we assume that the produced state is pseudoscalar. This fact, when combined with specificity ... More

Searching for optimal conditions for exploration of double-parton scattering in four-jet production at the LHCJun 29 2016We discuss the double-parton scattering (DPS) effects in four-jet production at the LHC. A special attention is given to the optimization of kinematical conditions in order to enhance the relative contribution of DPS in four-jet sample. The calculations ... More

Central exclusive production of pion pairs in proton-(anti)proton collisionsSep 25 2015We present results for exclusive $p p \to p p \pi^+ \pi^-$ or $p \bar p \to p \bar p \pi^+ \pi^-$ processes at high energies. We discuss the role of new additional absorption corrections in the non-resonant Lebiedowicz-Szczurek model mediated by the pomeron ... More

Searching for and exploring double-parton scattering effects in four-jet production at the LHCMar 27 2015We discuss four-jet production at the LHC. We calculate cross section for both single-parton scattering (SPS) using the ALPGEN code as well as for double-parton scattering (DPS) in leading-order collinear approach. Our results are compared with experimental ... More

Exclusive diffractive photon bremsstrahlung at high energiesJun 28 2013We discuss the $p p \to p p \gamma$ reaction at the LHC. We consider diffractive classical bremsstrahlung mechanisms including effects of non point-like nature of protons. In addition, we take into account (vector meson)-pomeron, photon-pion as well as ... More