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Igor Jex, Dean of FNSPE, CTU in Prague, Miroslav Myska (Czech Technical University (CZ))18/11/2019, 09:00
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Marc Dünser for the CMS Collaboration (CERN)18/11/2019, 09:10Double Parton Scattering
A summary of results on double parton scattering processes from CMS will be presented. The focus of the talk will lie on the latest result on WW production via double parton scattering. The data set in use is from the Run-II data taking periods in 2016 and 2017, corresponding to an integrated luminosity of 77.4 fb-1. The result constitutes the first evidence of this process, with an observed...
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Daria Savrina for the LHCb Collaboration (M.V. Lomonosov Moscow State University (RU))18/11/2019, 09:30Double Parton Scattering
The talk is going to include the latest LHCb results on searches of double parton scattering (DPS) effects in the data, taken by the experiment in proton-proton collisions during Run1 and Run2 of the LHC operation. The measurements are performed for the different final states and mainly focused on the processes involving heavy quarks, which provide the most precise probing of factorization...
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Oleh Fedkevych (INFN - National Institute for Nuclear Physics)18/11/2019, 09:50Double Parton Scattering
A composite nature of hadrons leads to a complicated structure of the underlying event in hadronic collisions. In particular it give rise to a possibility to have two hard interactions per one hadron-hadron collision, so called double parton scattering (DPS) phenomenon. Among different possible DPS production processes the four-jet DPS production is of particular interest due to a high...
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Dr Giulia Pancheri (INFN Frascati Laboratories)18/11/2019, 10:10Double Parton Scattering
We examine currently available data for Double Parton Scattering and discuss the energy behaviour of the extracted effective cross-section. A variety of models is compared with different data sets. We find that processes dominated by gluons initiated DPS, such as 4 jet production, exhibit a rising behaviour as the energy increases. Eikonal models as well as models based on empirical fits...
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Patrick Kirchgaesser18/11/2019, 11:00MPI & Small-x & diffraction
In this talk we review current developments regarding small-x and diffractive physics from the viewpoint of Monte Carlo Event Generators. Besides highlighting advances in describing diffractive events we also point out where further work is necessary.
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Elke-Caroline Aschenauer (BNL)18/11/2019, 11:35MPI & Small-x & diffraction
Understanding the properties of nuclear matter and its emergence through the underlying partonic structure and dynamics of quarks and gluons requires a new experimental facility in hadronic physics known as the Electron-Ion Collider (EIC). The EIC will address some of the most profound questions concerning the emergence of nuclear properties by precisely imaging gluons and quarks inside...
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Roman Pasechnik (Lund university)18/11/2019, 12:00MPI & Small-x & diffraction
Production of heavy photons (Drell-Yan), gauge bosons, Higgs bosons, heavy flavors and dijets, which is treated within the QCD parton model as a result of hard parton-parton collision, can be considered as a bremsstrahlung process in the target rest frame. In this talk, I will discuss the recent progress and the basic features of the diffractive channels of these processes in the framework of...
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Christine Overgaard Rasmussen (Lund University)18/11/2019, 14:00Monte Carlo, MB and UE
This talk focuses on the recent implementation of the Mueller dipole formalism in Pythia 8. We show how the dipole formalism can be used to assign spatial vertices to the MPIs in Pythia 8. This allows us to study geometric quantities such as initial state eccentricities, connected to flow coefficients measured at the LHC. In this work we show comparisons to pp, pPb and PbPb data from the LHC...
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Antonio Ortiz Velasquez (Universidad Nacional Autonoma (MX))18/11/2019, 14:20Monte Carlo, MB and UE
New measurements on particle production as a function of the charged-particle multiplicity in pp collisions have been reported by the ALICE Collaboration. The novelty of the results relies on the use of transverse spherocity for event classification in either pencil-like or isotropic events, which turn out to be sensitive to the main hard scattering or underlying event, respectively. Results...
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Ankita Mehta for the CMS Collaboration (Eötvös University, Budapest)18/11/2019, 14:40Monte Carlo, MB and UE
The talk will present the results obtained by the CMS collaboration on minimum bias processes and the so-called underlying event. An overview of what we learned during the whole Run 2 of the LHC will be provided.
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Ms Smita Chakraborty (Lund University)18/11/2019, 15:00Monte Carlo, MB and UE
The interaction force between Lund strings contributes to the flow effects in high-multiplicity pp and AA collisions. Hence, it is important to know how much push can this force exert on the strings, whose effects might be observed in the system as a whole. In this talk, we present our shoving mechanism implemented in the Lund string model. This mechanism, along with rope hadronization and...
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Philip Ilten for the LHCb Collaboration (University of Birmingham (GB))18/11/2019, 15:20Monte Carlo, MB and UE
Results from LHCb measuring bulk properties of minimum bias events, as well the inelastic cross-section will be summarized. Using these results, a tuning campaign for Pythia 8, specific to the LHCb fiducial volume, is underway and explores some of the newly available colour reconnection models. Some highlights from this tuning campaign will be presented.
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Przemyslaw Karczmarczyk for the ALICE Collaboration (Warsaw University of Technology (PL))18/11/2019, 16:10Heavy Ions
The comparison of experimental data and theoretical predictions is crucial for our understanding of the mechanisms for particle production and interactions in hadron collisions at the LHC. The Rivet (Robust Independent Validation of Experiment and Theory) framework was developed for this purpose and is used as a generator-independent system for event generator validation and tuning. It...
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Dr Grazia Luparello for the ALICE Collaboration (INFN Trieste), Grazia Luparello (Universita e INFN Trieste (IT))18/11/2019, 16:40Heavy Ions
Heavy quarks are sensitive probes to test the properties of the Quark-Gluon Plasma (QGP) state formed in heavy-ion collisions since, due to their large masses, they are formed on timescales shorter than the QGP formation time.
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In particular, the measurement of the azimuthal anisotropy of hadrons containing heavy quarks gives insight into the participation of low-momentum heavy quarks in the... -
Jana Bielcikova for the STAR Collaboration (Czech Academy of Sciences (CZ))18/11/2019, 17:00Heavy Ions
Studies of hot and dense QCD matter created in high energy heavy-ion collisions at the Relativistic Heavy Ion Collider (RHIC) revealed that the matter resembles properties of strongly coupled liquid with very low viscosity. High statistics data and major upgrades of the STAR experiment opened recently a new era of tomography of the QCD matter at RHIC using hard probes. In particular, the Heavy...
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Vytautas Vislavicius (University of Copenhagen (DK))19/11/2019, 09:00High Multiplicities (small system)
Results on hadron production in high-multiplicity proton-proton (pp) and proton-lead (p--Pb) collisions at the LHC energies have revealed the presence of collective phenomena reminiscent to those observed in lead-lead (Pb--Pb) collisions. The bulk particle production in Pb--Pb collisions cannot be calculated from first principles of QCD and instead relies on thermodynamic and hydrodynamic...
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Dr Aditya Nath Mishra (ICN-UNAM)19/11/2019, 09:20High Multiplicities (small system)
We present a phenomenological study of the number of Multiple Parton Interactions (MPI) as a function of mid-rapidity charged-particle multiplicity and leading transverse momentum ($\it{p_{\rm T}^{\rm {leading}}}$) in proton-proton collisions at $\sqrt{s}$ = 13 TeV using the event generator PYTHIA 8.240. We observe important correlations between leading charged particle $\it{p_{\rm T}}$ and...
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Adrian Fereydon Nassirpour for the ALICE Collaboration (ALICE Collaboration, Lund University (SE))19/11/2019, 09:40High Multiplicities (small system)
The underlying mechanisms of light flavour production are currently not well understood, although they can be described in the framework of different phenomenological models. pQCD models based on hard scatterings,
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such as PYTHIA, describe light flavour production via string-breakings and rope-hadronization.
Statistical thermal models predict that the production of light flavour particles is... -
Yuuka Kanakubo (Sophia Univ.)19/11/2019, 10:00High Multiplicities (small system)
Strangeness enhancement reported from the ALICE Collaboration [1] is referred to as an indication of the existence of quark-gluon plasma (QGP) in small colliding systems such as p+p and p+Pb collisions. Yield ratios of strange hadron show continuous increase as a function of multiplicity and saturation in averaged Pb+Pb events when the QGP is supposed to be formed. Motivated by this data, we...
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Maria Smizanska for the ATLAS Collaboration (Lancaster University (GB))19/11/2019, 10:50Double Parton Scattering
The associated production of vector boson with quarkonia is a key observable for understanding the quarkonium production mechanisms, including the separation of single and double parton scattering components.
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This talk will present the latest measurements from ATLAS on quarkonium production, including the associated production of W+J/psi. -
Roman Pasechnik (Lund university)19/11/2019, 11:10Double Parton Scattering
I will discuss a novel channel for phenomenological studies of the double-parton scattering (DPS) based upon associated production of charm and bottom quark-antiquark pairs in well-separated rapidity intervals in ultra-peripheral high-energy proton-nucleus collisions. This process provides a direct access to the double-gluon distribution in the proton at small-x and enables one to test the...
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Jean-Philippe Lansberg (IPN Orsay, Paris Saclay U. / IN2P3-CNRS)19/11/2019, 11:40Double Parton Scattering
I will review the status and prospects of studies of Double Parton Scatterings with associated and pair production of quarkonia. This includes J/psi pairs, Upsilon pairs, Upsilon+J/psi, J/Psi+D, Upsilon+D, J/psi+Z and J/psi+W at the LHC and the Tevatron.
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Dr Sergey Baranov (P.N.Lebedev Institute of Physics)19/11/2019, 12:00Double Parton Scattering
We consider a new mechanism for prompt simultaneous production of $J/\psi$ and $\Upsilon$ mesons in high energy hadronic collisions. The process is considered as a perturbative production of $B_c^{(*)}$ mesons $g{+}g\to B_c^{(*)} {+}\bar{B_c}^{\!\!(*)}$ followed by a long-distance final state interaction that rearranges the quarks to form $J/\psi$ and $\Upsilon$ mesons. Passing from...
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Mr Riccardo Nagar (Deutsches Elektronen-Synchrotron DESY)19/11/2019, 12:20Double Parton Scattering
Double parton distributions (DPDs) are an essentialingredient in the computation of the full DPS cross sections. Their numerical handling is complicated by their structure, which depends on more than twice the number of parameters with respect to regular PDFs. Furthermore, in order to make phenomenological predictions for DPS, it is necessary to also include heavy-quark contributions in the...
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Mate Csanad for the CMS Collaboration (Eotvos University, Budapest)19/11/2019, 14:00Monte Carlo, MB and UE
Bose-Einstein correlations of charged hadrons provide a tool to investigate the space-time structure of the hadron emitting source. In CMS we measure charged hadrons over a broad multiplicity range, from a few particles up to about 250 reconstructed charged hadrons in proton-proton collisions 13 TeV. Different analysis techniques were used to investigate the dependence on simulations when...
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Dr Vieri Candelise for the CMS Collaboration (Universita e INFN Trieste (IT))19/11/2019, 14:20Monte Carlo, MB and UE
A new set of CMS underlying-event tunes is presented for the PYTHIA 8 event generator. The tunes use the NNPDF3.1 parton distribution functions at leading (LO), next-to-leading (NLO), or next-to-next-to-leading (NNLO) order in perturbative QCD, and the strong coupling amd PDF evolution at LO or NLO. Comparisons of the predictions of the new tunes are provided for observables sensitive to the...
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Andrzej Konrad Siodmok (Polish Academy of Sciences (PL))19/11/2019, 14:40Monte Carlo, MB and UE
We present a model for generating spacetime coordinates in the Monte Carlo event generator Herwig 7, and perform colour reconnection by minimizing a boost-invariant distance measure of the system. We compare the model to a series of soft physics observables. We find reasonable agreement with the data, suggesting that pp-collider colour reconnection may be able to be applied in larger systems.
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Maciej Trzebinski for the ATLAS Collaboration (Polish Academy of Sciences (PL))19/11/2019, 15:00MPI & Small-x & diffraction
Inclusive single diffractive dissociation (pp->pX) is studied using data collected by the
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ATLAS experiment at the LHC. The intact proton is reconstructed and measured in the
ALFA forward spectrometer, while charged particles from the dissociative system (X)
are reconstructed and measured using the ATLAS inner tracking detector and
calorimeters. Differential cross sections are presented as... -
Dr P.V.R.G. Silva (Universidade Federal de Pelotas)19/11/2019, 15:55MPI & Small-x & diffraction
We present an update of the Miettinen-Pumplim (MP) model for diffractive excitation for proton-proton ($pp$) and antiproton-proton ($\bar{p}p$) scattering considering recent LHC data. The energy dependence of the total, elastic, and diffractive cross sections are analyzed and compared to data. The implications of the diffractive excitation in proton-nucleus ($pA$) collisions are also discussed...
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Ankita Mehta for the CMS Collaboration (Eötvös University, Budapest)19/11/2019, 16:20MPI & Small-x & diffraction
An overview of recent diffractive and exclusive measurements with CMS is given. Results on jet-gap-jet event topologies are shown, together with central exclusive p-p production. Diffractive dijet production is measured with proton tagging in pp collisions. In addition, recent results on exclusive rho0 and upsilon production in pPb collisions at 5.02 TeV are presented.
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Dr Lucian Harland-Lang (University of Oxford)19/11/2019, 16:45MPI & Small-x & diffraction
In this talk we present results of a new calculation and Monte Carlo implementation of photon-initiated production in LHC proton-proton collisions. This includes a precise, differential evaluation of both inclusive and semi-exclusive channels, that is with and without rapidity gaps in the final state. Details of the underlying formalism as well as phenomenological results will be presented.
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Alessio Tiberio for the LHCf Collaboration (INFN, Firenze (IT))19/11/2019, 17:10MPI & Small-x & diffraction
The LHC-forward (LHCf) experiment is dedicated to the measurement of the very forward neutral particle production cross section in proton-proton and proton-lead collisions at the Large Hadron Collider at CERN. The experiment employs two independent detectors, named Arm1 and Arm2, which are placed on opposite sides along the beam line approximately 140 meters away from the interaction point of...
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Prabhat Ranjan Pujahari for the CMS Collaboration (Indian Institute of Technology Madras (IN))20/11/2019, 09:00High Multiplicities (small system)
Collectivity in small systems with the CMS experiment
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Christopher Plumberg20/11/2019, 09:20High Multiplicities (small system)
Particle interferometry has proven to be an indispensable tool in probing the space-time evolution of femtoscopic collision systems. In this talk, I show how hydrodynamic predictions for the space-time evolution of high-multiplicity $pp$ and $p+$Pb collisions can be tested against interferometric observables designed to probe their size and shape. In particular, I consider how the dependence...
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Reinhild Peters for the ATLAS Collaboration (University of Manchester (GB))20/11/2019, 09:40High Multiplicities (small system)
Measurements of distributions of two weighted angular moments derived from jet
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constituents are presented. The jet-pull angle and the jet-pull magnitude, both of
which are derived from the jet-pull angular moment, encode the colour connections between
partons that seed the jets.
The measurements are performed in top-quark-antiquark events with one leptonically
decaying W boson and one... -
Marius Utheim (Lund University)20/11/2019, 10:00High Multiplicities (small system)
We have developed a framework for hadronic rescattering in Pythia. Our goal is to study how rescattering can account for observed phenomena such as flow, jet quenching, etc. In this presentation I will outline our algorithm and present some preliminary results.
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Irais Bautista Guzman (Autonomous University of Puebla (MX))20/11/2019, 10:20High Multiplicities (small system)
High multiplicity events in heavy-ion collisions are still under debate whether they produce an extremely hot and dense matter similar to the QGP formed on heavy atomic nuclei collisions. One of the main characteristics of the formation of this state is that it behaves like a near-perfect fluid, with very tiny shear viscosity. We present an estimate of the shear and bulk viscosity properties...
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Mate Csanad for the PHENIX Collaboration (Eotvos University, Budapest)20/11/2019, 11:10Heavy Ions
Exploration of the rich structure of the QCD phase diagram is an important topic in the RHIC heavy ion program whose ultimate goal is to discover the critical endpoint. Investigation of the space-time structure of hadron emissions at various phase transition points using Bose-Einstein correlation of identical bosons will provide insight on the location of the critical endpoint. PHENIX has...
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Dr Taesoo Song (GSI)20/11/2019, 11:30Heavy Ions
Relativistic heavy-ion collisions produce extremely hot dense matter.
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Heavy flavor and electromagnetic particles are promising probes to
investigate the properties of the hot dense matter. The
parton-hadron-string dynamics (PHSD) is a Boltzmann-type transport code,
but it further includes the off-shellness of particles based on
Kadanoff-Baym equations. The equation-of-state and shear... -
Bin Wu (CERN)20/11/2019, 11:50Heavy Ions
To study the microscopic structure of quark-gluon plasma produced in hadronic collisions, data must be confronted with models that go beyond fluid dynamics. In order to illustrate the importance of non-fluid like excitations in small systems such as pp and pA collisions, I shall discuss the interplay of fluid-like and non-fluid like excitations in a simple kinetic theory model that encompasses...
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Antonin Maire (IPHC - Strasbourg (CNRS-In2p3/Unistra)), Christian Bierlich (Lund University (SE)), Karel Safarik (Czech Technical University (CZ)), Valentina Zaccolo (Universita e INFN Trieste (IT))20/11/2019, 12:10Heavy Ions
Open discussion.
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Ralf Ulrich (KIT - Karlsruhe Institute of Technology (DE))21/11/2019, 09:30Monte Carlo, MB and UE
With current large cosmic ray observatories, precise data of extensive air shower cascades is recorded up to primary particle energies of 10^{20}eV. While there is significant progress in understanding cosmic rays in general, and also particle physics in the air shower cascades, there are also tantalizing open questions. The most interesting one is the "muon mystery", which is a strong hint...
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Omar Vazquez Rueda for the ALICE Collaboration (Lund University (SE))21/11/2019, 10:00Monte Carlo, MB and UE
Various recent measurements of high-multiplicity pp and p-A collisions at LHC energies have revealed, surprisingly, that these small collision systems exhibit some features of the quark-gluon-plasma, e.g. collective behaviour and strangeness enhancement, formerly thought to be achievable only in heavy-ion collisions. A promising method to narrow down the origin of this behaviour is to study...
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Stefan Gieseke (Karlsruhe Institute of Technology)21/11/2019, 10:20Monte Carlo, MB and UE
Recent progress in the development of the general purpose Monte Carlo generator Herwig 7 will be presented. A focus will be given to progress in modeling underlying event and minimum bias.
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Guy Paic (Universidad Nacional Autonoma (MX))21/11/2019, 10:40Monte Carlo, MB and UE
The correlation between the near side and transverse side has been studied with Pythia. Strong correlations between the two regions occur at high multiplicities of above dN/deta of 50 charged particles. The changes occurring in the spectra obtained subtracting the transverse side spectra are reported. We conclude that the results indicate the possibility of parton energy loss in pp collisions.
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Prof. Jesus Guillermo Contreras Nuno (Czech Technical University (CZ))21/11/2019, 11:30MPI & Small-x & diffraction
Up to now, searches for saturation have concentrated in the the small-x behaviour of QCD. Here we add the transverse dimension to this type of studies. We present a model of hadrons with an energy-dependent structure in the transverse plane made of hot spot, regions of high gluonic density. Using this model and the colour-dipole formalism we compute the diffractive photoproduction of vector...
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Josef Pacalt for the ATLAS Collaboration (Palacky University (CZ))21/11/2019, 11:55MPI & Small-x & diffraction
We present fits to determine parton distribution functions (PDFs) using top-antitop,
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inclusive W/Z-boson, as well as W+ and W− boson production measurements in
association with jets from ATLAS, in combination with deep-inelastic scattering data
from HERA. The ATLAS W and Z boson data exhibit sensitivity to the valence quark
distributions and the light quark sea composition, whereas the... -
Antoni Szczurek (Institute of Nuclear Physics)21/11/2019, 12:20MPI & Small-x & diffraction
We present results of calculations of cross sections for production of $\eta_c$(1S)
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and $\eta_c$(2S) for the LHC for $\sqrt{s}$ = 7, 8, 13 TeV.
The calculations are performed within $k_t$-factorization approach
for different unintegrated gluon distributions from the literature.
Some of UGDFs include saturation effects.
We discuss effect of the transition $g^* g^* \to \eta_c$ form factors... -
Dr Matteo Rinaldi (Perugia University and INFN, Perugia)21/11/2019, 14:00Double Parton Scattering
Here we present our studies on the so called double parton distribution functions (dPDFs) and transverse proton structure. Double PDFs appear in the double parton scattering (DPS) cross section in high energy proton-proton and proton nucleus collisions. These new distributions represent a novel and promising complementary tool, w.r.t. TMDs and GPDs, to access the 3D partonic structure of the...
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Christian Zimmermann21/11/2019, 14:25Double Parton Scattering
Double parton distributions (DPDs) are an important piece in the descriptions of double hard interactions. On the lattice we calculate correlation functions of two local quark currents, which can be related to Mellin moments of DPDs. For the first moment we calculate all contributing Wick contractions for the nucleon (proton), considering several channels corresponding to the quark...
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Federico Alberto Ceccopieri (Universita & INFN, Milano-Bicocca (IT))21/11/2019, 14:45Double Parton Scattering
W boson creation associated with dijet production is a promising channel to study double parton interactions at the LHC. In this talk we review and update predictions for the W+jets signal in proton lead collisions and discuss a new method which could give access to longitudinal and/or transverse structure of the proton.
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Krzysztof Golec-Biernat (Institute of Nuclear Physics, Cracow), Krzysztof Jan Golec-Biernat (Institute of Nuclear Physics PAN, Krakow, Poland)21/11/2019, 15:05Double Parton Scattering
I will present results of my investigations on the topics enumerated in the title based on my joint work with my collaborators.
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Baptiste Cabouat (University of Manchester), Jonathan Richard Gaunt (CERN)21/11/2019, 15:25Double Parton Scattering
In this talk, a new Monte-Carlo simulation of double parton scattering (DPS) at parton level is presented. In this simulation, the dynamics of the 1→2 perturbative splittings is consistently included, with the impact-parameter dependence taken into account. The evolution is performed using an angular-ordered parton shower which is combined with a set of double parton distributions that depend...
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Prof. Andrew Koshelkin (National Research Nuclear University)21/11/2019, 16:15High Multiplicities (small system)
The hadronization of the deconfined matter arising in high-energy particle collisions is considered in terms of the first kind phase transition in the multiple flux tube approach. Based on the compactification of the standard (3+1) chromodynamics into $ QCD_{xy} + QCD_{zt}$, the rate of hadron production in particle collisions with respect to both the rapidity and $p_T$ distributions ...
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8. Charged particle multiplicity dependence of quarkonium production measured by the STAR experimentDr Leszek Kosarzewski for the STAR Collaboration (Czech Technical University in Prague)21/11/2019, 16:45High Multiplicities (small system)
Recently, an interesting faster than linear dependence of quarkonium production on charged particle multiplicity in p+p collisions has been observed. This can be used to study basic particle production mechanism and relation between soft and hard QCD processes. Such a strong increase of normalized particle yield from hard processes with respect to normalized charged particle multiplicity may...
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Fiorella Fionda (University of Bergen (NO))21/11/2019, 17:05High Multiplicities (small system)
At the LHC energies Multiple Parton Interactions (MPI) are expected to affect not only processes involving soft particle production, but also the hard momentum scales relevant for the production of heavy quarks, such as charm and beauty. Quarkonium measurements in high-multiplicity proton-proton (pp) collisions can shed light on the role of MPI at such hard momentum scales, as well as on the...
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Dr Barbara Antonina Trzeciak for the ALICE Collaboration (Czech Technical University in Prague)21/11/2019, 17:25High Multiplicities (small system)
Measurements of the production of light- and heavy-flavor hadrons are of great importance for studies of the matter produced in high-energy collisions. The ALICE experiment has excellent tracking and particle identification capabilities, which have been used to measure a wide variety of hadrons as a function of multiplicity in pp collisions. Studies of light- and heavy-flavor hadrons in...
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Christine Overgaard Rasmussen (Lund University), Radek Zlebcik (Deutsches Elektronen-Synchrotron (DE))22/11/2019, 09:00
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Christine Overgaard Rasmussen (Lund University), Radek Zlebcik (Deutsches Elektronen-Synchrotron (DE))22/11/2019, 09:15
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Arthur Moraes (CBPF - Brazilian Center for Physics Research (BR)), Daria Savrina (M.V. Lomonosov Moscow State University (RU)), Rafal Maciula (Institute of Nuclear Physics PAN)22/11/2019, 09:30
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Arthur Moraes (CBPF - Brazilian Center for Physics Research (BR)), Daria Savrina (M.V. Lomonosov Moscow State University (RU)), Rafal Maciula (Institute of Nuclear Physics PAN)22/11/2019, 09:45
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Guy Paic (Universidad Nacional Autonoma (MX)), Philip Ilten (University of Birmingham (GB)), Valentina Mariani (Universita e INFN, Perugia (IT))22/11/2019, 10:00
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Guy Paic (Universidad Nacional Autonoma (MX)), Philip Ilten (University of Birmingham (GB)), Valentina Mariani (Universita e INFN, Perugia (IT))22/11/2019, 10:15
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Antonin Maire (IPHC - Strasbourg (CNRS-In2p3/Unistra)), Karel Safarik (Czech Technical University (CZ))22/11/2019, 11:00
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Antonin Maire (IPHC - Strasbourg (CNRS-In2p3/Unistra)), Karel Safarik (Czech Technical University (CZ))22/11/2019, 11:15
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Christian Bierlich (Lund University (SE)), Valentina Zaccolo (Universita e INFN Trieste (IT))22/11/2019, 11:30
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Christian Bierlich (Lund University (SE)), Valentina Zaccolo (Universita e INFN Trieste (IT))22/11/2019, 11:45
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Thomas TrainorHigh Multiplicities (small system)
Certain data features that were attributed to quark-gluon plasma (QGP) formation in more-central A-A collisions -- evidence for radial flow and jet quenching in pt spectra, v2, v3, etc. in azimuth correlations, one or two "ridge" structures in long-range angular correlations -- have more recently been observed in high-multiplicity p-A and even p-p collisions. Arguing by analogy with A-A...
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Collaboration ATLAS (ATLAS Collaboration)Monte Carlo, MB and UE
A measurement of charged-particle distributions sensitive to the properties of the
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underlying event is presented for an inclusive sample of events containing a Z-boson,
decaying to a muon pair. The measurement is done using proton-proton collision data
collected by the ATLAS experiment at √s=13 TeV. Unfolded differential cross sections
are presented for charged particle multiplicity and... -
Collaboration ATLAS (ATLAS Collaboration)Double Parton Scattering
Measurements of double parton scattering in proton-proton collisions provide insight
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into the structure and long-range low-momentum scale interactions of the proton. In this
talk we present a measurement of the double-parton scattering contribution to
four-lepton events at √s=8 TeV. An artificial neural net is used to optimise the analysis
and an upper limit on the double-parton scattering... -
Collaboration ATLAS (ATLAS Collaboration)Monte Carlo, MB and UE
In this talk, we present four measurements that probe the internal structure of jets using
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data collected by the ATLAS experiment. First, a measurement of the properties of jet
fragmentation using charged particle tracks is presented, including charged particle
multiplicity, jet charge, the summed fragmentation function, the momentum transverse
to the jet axis, and the radial profile of...
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