Welcome

• Christophe Royon (The University of Kansas (US))
• Fotios Ptochos (University of Cyprus (CY))

Latest results on double parton scattering and MC tuning from CMS

• Radek Zlebcik (Deutsches Elektronen-Synchrotron (DE))

Measurements of multi-parton interactions at ATLAS

• Tibor Zenis (Comenius University (SK))

J/\psi production in hadron scattering: two parton showers contribution

• Eugene Levin (Tel Aviv University)

Regge cuts in the Reggeized gluon channel

• Victor Fadin (Budker Institute of Nuclear Physics)

BFKL resummation in inclusive processes

• Alessandro Papa (Universita` della Calabria & INFN-Cosenza)

Low $x$ physics and saturation in terms of TMD distributions

• Renaud Boussarie (Brookhaven National Lab)

One of the main difficulties to understand the continuity between low x physics and more standard QCD factorization frameworks which apply for more moderate energies is the very nature of the parton distributions involved. I will argue that low x physics can be understood as the eikonal limit of an infinite twist TMD distribution framework, and discuss the consequences of this observation for saturation and for gluon polarizations at small x.

Discussion session: DPS, saturation

• Brian Foster (University of Oxford (GB))
• Eugene Levin (Tel Aviv University)
• Dimitri Colferai

Forward photon measurements with ALICE at the LHC as a probe for low-x gluons

• Thomas Peitzmann (Nikhef National institute for subatomic physics (NL))

Measurements of event properties and correlations in multi jet events in CMS

• Cristian Baldenegro Barrera (The University of Kansas (US))

Measurements of event properties and correlations in multi jet events in CMS are reviewed.

Mueller Tang cross sectiona at NLL

• Federico Deganutti

Topological charge fluctuations in the Glasma

• Pablo Guerrero Rodríguez (UGR)

The NL BFKL vertex for Mueller-Tang jets in the soft-gluon approximation

• Dimitri Colferai

Forward jet cross sections: from trijet to NLO dijet

• Yair Mulian

Using the formalism of the light-cone wave function in pQCD together with the hybrid factorization, we compute the cross-section for two and three particle production at forward rapidities in proton-nucleus collisions. We focus on the quark channel, in which the three produced partons -- a quark accompanied by a gluon pair, or two quarks plus one antiquark -- are all generated via two successive splittings starting with a quark that was originally collinear with the proton. The produced partons are put on-shell by their scattering off the nuclear target, described as a Lorentz-contracted "shockwave". By using the three-parton component of the quark light-cone wave function, together with the virtual corrections, we can then present our progress on the computation of the next-to-leading order correction to the cross-section for the production of a pair of jets.

Impact parameter dependence of colinearly improved Balitsky-Kovchegov evolution

• Marek Matas (CERN)

BFKL Resummation in the inclusive Higgs Boson Plus Jet production at the LHC

• Mohammed Maher Abdelrahim Mohammed (Università della Calabria and INFN - Gruppo collegato di Cosenza)

The inclusive production of a Higgs boson and of a jet at the LHC, featuring a wide separation in rapidity, is an interesting probe process for the investigation of the BFKL mechanism of resummation of energy logarithms in the QCD perturbative series. Here, we present for the first time a partial next-to-leading order BFKL analysis for cross sections and azimuthal correlations.

Discussion session: jet gap jets, BFKL saturation

• Dimitri Colferai
• Eugene Levin (Tel Aviv University)

Recent PDF results from top physics and heavy flavour results at CMS

• Katarzyna Wichmann (Deutsches Elektronen-Synchrotron (DE))

Multiple scattering effects in heavy quarkonia hadroproduction

• Leszek Motyka

Correlations at unequal rapidity in the dilute limit of JIMWLK

• Andrecia Ramnath (University of Jyvaskyla)

Unequal rapidity correlations can be studied within the stochastic Langevin picture of JIMWLK evolution in the Colour Glass Condensate effective field theory. By evolving the classical field in the direct and complex conjugate amplitudes, the Langevin formalism can be used to study two-particle production at large rapidity separations. The evolution between the rapidities of the two produced particles can be expressed as a linear equation, even in the full nonlinear limit. In addition, the Langevin formalism for two-particle correlations reduces to a BFKL picture in the dilute limit and in momentum space, providing an interpretation of BFKL evolution as a stochastic process for colour charges.

Introduction to XFitter

• Katarzyna Wichmann (Deutsches Elektronen-Synchrotron (DE))

xFitter project - a framework for QCD studies

• Agnieszka Luszczak

Determination of proton parton distribution functions using ATLAS data

• Lorenzo Bellagamba (Universita e INFN, Bologna (IT))

Discussion session: PDFs, DGLAP...

• Brian Foster (University of Oxford (GB))
• Katarzyna Wichmann (Deutsches Elektronen-Synchrotron (DE))
• Leszek Motyka

Prospects for measurements of H/Z production cross section ratios using CMS Run II data

• Louis Moureaux (Universite Libre de Bruxelles (BE))

Initial-state fluctuations and anisotropies in heavy-ion collisions

• Cyrille Michel Marquet (Universidade de Santiago de Compostela (ES))
• Cyrille Marquet (CPHT - Ecole Polytechnique)
• Cyrille Marquet (Theory Division - CERN)

Sudakov resummation in the CGC framework

• Shu-yi Wei (CPHT, Ecole Polytechnique)

In this talk we would like to present our recent works on how to incorporate Sudakov resummation into the dilute-dense factorization framework.

Thermal radiation and inclusive production in the CGC/saturation approach at high energies for hadron-hadron and ion-ion collision

• Eugene Levin (Tel Aviv University)

Vertices of three reggeized gluons and the unitarity corrections to the propagator of reggeized gluons

• Semyon Pozdnyakov (Saint Petersburg State University, Ariel University)

High energy QCD hadronic interactions in the Regge kinematics, when the transferred transverse momenta are much smaller than an energies of colliding particles, can be described by the interaction of gluons with reggeized ones ("reggeized gluons", reggeons). The description of these processes was firstly introduced in series of L.N. Lipatov's papers. Calculations of the amplitudes of different scattering processes in this approach reveal also a so-called multi-Regge structure of the amplitudes. Therefore, in order to analyze different scattering processes with multi-Regge kinematics, L.Lipatov proposed an effective action based on QCD properties at high energy. We develop the effective action formalism, see \cite{1,2,3,4,5,6} , based on the reggeized gluons as the main degrees of freedom, which can be considered as a reformulation of the RFT (Regge field theory) calculus for the case of high-energy QCD. The perturbation theory is based on the knowledge of the classical solutions of equations of motion and loops contributions to effective action. Our main goal in this study is to obtain unitarity corrections to amplitudes. The unitarity corrections to the propagator of reggeized gluons calculated in the framework of QCD RFT require a knowledge of the expressions for reggeon propagator and vertices of the interaction of three reggeons to one QCD loop precision. In the last paper \cite{6}, we calculated the vertex of interactions of $A_+A_+A_-$ Reggeon fields to this precision. We demonstrated, that all loop leading logarithmic order contributions to the vertex can be summed through the integro-differential equation similar to the BFKL one. \renewcommand\bibsection{\nsection{References}} \begin{thebibliography}{4} \bibitem{1} S.Bondarenko, L.Lipatov, S.Pozdnyakov, A.Prygarin. One loop light-cone QCD, effective action for reggeized gluons and QCD RFT calculus (2017) // Eur. Phys. J. 2017. Vol. {\bf C77}:630. \bibitem{2} S.Bondarenko, S.S.Pozdnyakov (2018). NNLO classical solution for Lipatov's effective action for reggeized gluons // Submitted to Int.J.Mod.Phys. A, arXiv:1802.05508 %\cite{Bondarenko:2018kqs} \bibitem{3} S.Bondarenko, S.S.Pozdnyakov (2018). S-matrix and productions amplitudes in high energy QCD // Phys.Lett. B783 207-211 %%CITATION = ARXIV:1803.04131;%% \bibitem{4} S. Bondarenko, S.S. Pozdnyakov (2018). On correlators of Reggeon fields and operators of Wilson lines in high energy QCD, Int.J.Mod.Phys. A33 (2018) no.35, 1850204\\ \bibitem{5} S. Bondarenko and S. Pozdnyakov (2018). On QCD RFT corrections to the propagator of reggeized gluons, arXiv:1903.11288 [hep-th]\\ \bibitem{6} S. Bondarenko and S. Pozdnyakov. On reggeization of vertex of three reggeized gluons in high energy QCD, arXiv:1905.04916 [hep-ph]. %%CITATION = ARXIV:1905.04916;%% \end{thebibliography}

UPC results from ALICE

• Roman Lavicka (Czech Technical University (CZ))

Discussion session: Heavy ions

• Cyrille Marquet (CPHT - Ecole Polytechnique)

V+jets production and Jet cross sections at CMS and tests of QCD

• Bugra Bilin (Universite Libre de Bruxelles (BE))

NNLO QCD fits to jets and extraction of alpha_s

• Katarzyna Wichmann (Deutsches Elektronen-Synchrotron (DE))

Measurements of single diffraction using forward proton tagging at ATLAS

• Rafał Staszewski (IFJ PAN Cracow (PL))

Diffractive PDF determination from HERA inclusive and jet data at NNLO QCD

• Radek Zlebcik (Deutsches Elektronen-Synchrotron (DE))

Recent results on soft and forward physics from CMS

• Cristian Baldenegro Barrera (The University of Kansas (US))

Recent results on soft and forward physics from CMS are reviewed.

LHCf forward physics results

• Oscar Adriani (Dipartimento di Fisica)

The main aim of the LHC forward (LHCf) experiment is to provide precise measurements of the particles production spectra in the forward region of the hadronic collisions. These high energy calibration data are very important for the tuning of hadronic interaction models used by ground-based cosmic rays experiments. LHC is the best place where we can perform these measurements, because proton-proton collisions at √s = 14 TeV is equivalent to the interaction of a 10^17 eV cosmic ray with the atmosphere. LHCf makes use of two small sampling calorimeters installed at ±140 m from LHC IP1, so that it can detect neutral particles produced by p-p and p-ion collisions with pseudo-rapidity η > 8.4. In the past years, LHCf acquired data in p-p and p-ion collisions at different energies (p-p at √s = 0.9, 2.76, 7 and 13 TeV; p-Pb at √sNN = 5.02 and 8.1 TeV). In this talk, we will present the analysis results published by the collaboration, relative to neutrons, photons and π0 production spectra, compared with models predictions. We will also present some preliminary results relative to the ATLAS-LHCf common analysis, from which we expect to significantly increase the impact of LHCf measurements, discriminating between diffractive and non- diffractive events by the use of ATLAS information in the central region. A short overview of the future activities foreseen at the LHC-Run3 (14 TeV p-p and p-O runs) will also be given.

Discussion session: inclusive diffraction

• Rafał Staszewski (IFJ PAN Cracow (PL))
• Michael Albrow (Fermi National Accelerator Lab. (US))

Recent results from PPS and PPS status and prospects

• Andrea Bellora (Universita e INFN Torino (IT))

Recent results CMS and TOTEM on exclusive production, light by light scattering and diffraction

• Michael Albrow (Fermi National Accelerator Lab. (US))

Recent results CMS and TOTEM on exclusive production, light by light scattering and diffraction are reviewed.

Anomalous coupling studies and the pomeron structure at the LHC

• Christophe Royon (The University of Kansas (US))

Axion-like particles in light-by-light scattering in pp, pPb, and Ar-Ar collisions

• Cristian Baldenegro Barrera (The University of Kansas (US))

Searches for Dark Matter at the LHC in forward proton mode

• Valery Khoze (University of Durham (GB))

Studies of Central Exclusive Production and Soft QCD phenomena at LHCb

• Lavinia-Elena Giubega (IFIN-HH (RO))

The LHCb detector at the LHC offers unique coverage of forward rapidities. This enables complementary measurements of soft QCD phenomena to those at the other LHC detectors. Measurements of the inelastic cross-section and of particle production will be presented. Measurements of Central Exclusive Production (CEP) at LHCb will also be presented. These measurements probe QCD, allowing investigation of the nature of pomerons, and provide constraints on low-x gluon phenomenology, probing potential saturation effects. CEP measurements at LHCb in the most recent LHC run have significantly benefited from the installation of new high rapidity shower counters (the “HeRSCHel” subdetector). The performance and use of this new detector for CEP studies will also be discussed.

Discussion session: exclusive diffraction

• Christophe Royon (The University of Kansas (US))
• Valery Khoze (University of Durham (GB))

Review of TOTEM results

• Jan Kaspar (Acad. of Sciences of the Czech Rep. (CZ))

Scaling properties of elastic pp and ppbar scattering at LHC energies

• Tamas Csorgo (Hungarian Academy of Sciences (HU))

Photon-induced processes in production of heavy particle pairs at the LHC

• Marta Luszczak (University of Rzeszow)

Results on Total and Elastic Cross Sections in p+p collisions at sqrt(s) = 200 GeV with the STAR Detector at RHIC

• Wlodek Guryn (Brookhaven National Laboratory)

Roman pots and the impact parameter for ion-ion

• Janusz Chwastowski (Polish Academy of Sciences (PL))

Recent results on central exclusive production within the tensor-pomeron and vector-odderon approach

• Piotr Lebiedowicz (Institute of Nuclear Physics PAN)

Discussion session: Soft and hard diffraction

• Tamas Csorgo (Hungarian Academy of Sciences (HU))
• Valentina Avati (AGH University of Science and Technology (PL))

Closing items

• Christophe Royon (The University of Kansas (US))
• Fotios Ptochos (University of Cyprus (CY))