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Feng Yuan (LBNL)19/03/2018, 09:00
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Ernst Sichtermann19/03/2018, 11:00
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Iris Abt (MPI)19/03/2018, 14:05
HERA was running with four experiments. The collaborations focused on different physics questions; ZEUS and H1 were both multipurpose experiments for ep DIS. The HERA inclusive DIS data alone cover a phase-space allowing the extraction of PDFs. More information/PDFs can be extracted by adding heavy flavor and jet data. It is discussed what was learned about the proton, what polarised beams can...
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Dr Juan Rojo (VU Amsterdam and Nikhef)19/03/2018, 14:55
The determination of the quark and gluon structure of the proton is a central component of the precision phenomenology program at the Large Hadron Collider (LHC) as well of future hadron-hadron and lepton-hadron colliders. In this talk I review recent progress in the determination of the quark and gluon structure of the proton, with emphasis on the impact of new processes in the global PDF...
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Dr Yoshitaka Hatta (Kyoto U)19/03/2018, 15:30
The Wigner and Husimi distributions have been proposed as phase space distributions of partons inside the nucleon. I discuss various aspects of these distribution including their experimental measurement, model calculations, applications to spin physics.
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Hannu Paukkunen (University of Jyväskylä)19/03/2018, 16:30
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Mr Raju Venugopalan (BNL)19/03/2018, 17:00
We discuss inclusive photon production to next-to-leading order accuracy in both p+A and e+A collisions within the color glass condensate framework of high energy QCD. For hadron-hadron collisions, we will present comparisons to data in p+p and p+A collisions. For e+A data, we will outline some advantages of our framework relative to extant NLO computations in the literature.
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Giannis Koutsou (The Cyprus Institute)19/03/2018, 17:30
I will review recent progress in nucleon structure calculations on the lattice, focusing on results obtained from simulations with physical or near-physical quark mass values. In particular, results on moments of generalized parton distributions and the axial, scalar, and tensor charges will be presented. I will also discuss the implications of these results on the decomposition of the nucleon...
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Dennis Sivers (Portland Physics Institute)19/03/2018, 18:00
Improvements in our understanding of confinement allows the modification of the phenomenology of jet fragmentation. Transverse-momentum dependent jet observables allow for a global description of the dynamics of QCD jets including long-range correlations associated with quantum interference.
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Krzysztof Golec-Biernat20/03/2018, 09:00
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Peter Braun-Munzinger (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE))20/03/2018, 09:30
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Michael Lublinsky (Ben-Gurion University of the Negev (IL))20/03/2018, 10:00
I will first discuss entanglement entropy of
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soft gluons in a light cone wave function of a fast moving projectile hadron and
then entropy production in collisions with target nucleus. -
Stefan Floerchinger (Heidelberg University)20/03/2018, 11:00
We develop a novel real-time approach to computing the entanglement between spatial regions for Gaussian states in quantum field theory. The entanglement entropy is characterized in terms of local correlation functions on space-like Cauchy hypersurfaces. The framework is applied to explore an expanding light cone geometry in the particular case of the Schwinger model for quantum...
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Dr Ilkka Helenius (Tübingen University)20/03/2018, 11:30
Photoproduction in electron-proton collisions were extensively studied at HERA for several observables. In these processes a quasi-real photon from the lepton interacts with the proton. Due to the small virtuality, the photons may also fluctuate into a hadronic state so that constituting partons act as initiators of the hard process. The partonic structure of these resolved photons can be...
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Sanjin Benic20/03/2018, 12:00
We report on a recent computation [1] of the semi-inclusive photon-jet angular correlations in high energy $p+A$ collisions at the next-to-leading order (NLO) in the Color Glass Condensate framework. The NLO result considers the $p + A \to q\bar{q} \gamma$ channel appropriate at central rapidities. We focus on the nearly back-to-back photon-jet configurations and find the leading-order $p + A...
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Dr Heikki Mäntysaari (University of Jyväskylä)20/03/2018, 14:00
Thanks to A^{1/3} enhancement on the saturation scale in a heavy nucleus compared to that of the proton, nonlinearities are enhanced in nuclei compared to proton. This makes nuclear DIS an ideal laboratory to study the small-x structure of the nucleus. Probably the most powerful process for this is exclusive vector meson production, which at leading order is proportional to the squared gluon...
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Tuomas Lappi (University of Jyvaskyla)20/03/2018, 14:25
We calculate energy deposition and axial charge production from color flux tubes at early times in a heavy-ion collision. Based on analytic expressions for the space-time dependent fluctuations of the axial charge and energy density distributions in terms of the unpolarized and linearly polarized gluon distributions of the nuclei, we develop a phenomenological model for the initial state,...
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Phiala Shanahan (Massachusetts Institute of Technology)20/03/2018, 14:50
I will describe the status of lattice QCD studies of gluon structure quantities in nucleons and nuclei. I will focus in particular on the prospects for controlled determinations of key effects such as a gluon analogue of the EMC effect, and exotic glue in nuclei, ahead of the planned EIC.
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Douglas Wertepny (Universidade de Santiago de Compostela)20/03/2018, 15:15
The correlation length associated with color-charge fluctuations, known as the inverse saturation momentum, plays a fundamental role in the initial conditions of heavy-ion collisions. With state-of-the-art hydrodynamic codes tailored for the finite-baryon-density physics of the Beam Energy Scan, it is interesting to study the analogous role of correlations between quarks and antiquarks. ...
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Dr Pawel Nadel-Turonski (Stony Brook University)20/03/2018, 16:05
The Electron-Ion Collider (EIC) will provide the first opportunity to study electron-nucleus (eA) scattering at high energies. For heavy ions, key measurements include QCD at high gluon densities and the onset of saturation, mapping of the transverse spatial gluon distribution through coherent diffraction, and parton/hadron propagation in cold nuclear matter. All these measurements greatly...
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Víctor Vila (Universidade de Santiago de Compostela)20/03/2018, 16:30
We study the color coherence phenomenon starting from the original quark-antiquark antenna laboratory in the presence of a medium. Measurements of jet substructure shed light on the character of the jet interactions with the dense medium formed in the collisions, which can break the intrajet color coherence leading to interesting phenomena. Describing the decoherence of the $ q \bar{q} $ pair...
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Andrecia Ramnath (University of Jyvaskyla)20/03/2018, 16:55
Within the Colour Glass Condensate effective field theory, the JIMWLK equation can also be used to describe the energy evolution of long-range rapidity correlations in nuclear collisions. The projectile interaction with the target classical field is described by Wilson lines. It is useful for numerical implementations to study JIMWLK evolution as a stochastic process. A Langevin equation then...
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Dr Piotr Korcyl (Jagiellonian University & Regensburg University)20/03/2018, 17:20
We report on the status of a current project by the RQCD lattice QCD group aimed at non-perturbatively estimating the second moment of the pion distribution amplitude. Our investigation is carried out using Nf=2+1 dynamical non-perturbatively order a improved Wilson fermions on lattices of different volumes and pion masses down to 220 MeV. We employ momentum smearing in order to decrease the...
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Dr Pisano Cristian (University of Cagliari and INFN)20/03/2018, 17:45
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Prof. Amanda Cooper-Sarkar (University of Oxford (GB))21/03/2018, 09:00
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Werner Vogelsang21/03/2018, 09:30
We discuss various aspects of azimuthal asymmetries in the Drell-Yan process, focusing on the role of perturbative-QCD calculations. We address both the fixed-target and the collider regime. Furthermore, we present pQCD predictions for the Drell-Yan cross section averaged over the azimuthal angle, where we discuss the role of QCD threshold resummation.
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Michael Klasen21/03/2018, 10:00
We present NLO predictions for dijet photoproduction cross sections at a future EIC. Similarly to inclusive jet production in DIS that we studied previously, dijet photoproduction is shown to constrain nuclear PDFs (in particular the one of the gluon) in a way that is complementary to the information from inclusive DIS. The process is also sensitive to photon PDFs, as has already been...
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Renee Fatemi (University of Kentucky)21/03/2018, 11:00
During the last decade a robust TMD program has blossomed at RHIC. A variety of observables, including $W^{\pm}/Z$ and hadron+jet reconstruction, are sensitive to TMD parton distribution and fragmentation functions. This talk will review existing results, outline plans for continued studies in proton-proton collisions and discuss the implications for a future EIC.
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Jianhui Zhang21/03/2018, 11:30
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Joseph Karpie (College of William and Mary)21/03/2018, 12:00
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Guillaume Beuf21/03/2018, 14:00
In the regime of low Bjorken x, Deep Inelastic Scattering (DIS) is better described within the dipole factorization formalism, which allows to take into account the nonlinear effects of gluon saturation as well as the resummation of the high-energy leading logarithms (LL).
So far, phenomenological studies have been performed successfully at LO in the dipole factorization, with high-energy LL...
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Markus Diehl (DESY)21/03/2018, 14:30
We study the evolution of parton densities in the proton to very low scales. Starting with Mellin moments obtained from global PDF fits, we find that the current knowledge of PDFs exludes scenarios in which the gluon or the antiquark distributions in the proton vanish (or are very small) at some low scale, at least when perturbative evolution is used.
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Alexey Vladimirov21/03/2018, 15:00
We review the theory of transverse momentum distributions (TMDs). The emphasis is made on the recent development in the perturbation theory and its influence on the predictions/extraction of TMDs.
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Rajan Gupta (Los Alamos National Lab)21/03/2018, 15:30
Nucleon TMDs from Lattice QCD
We summarize the calculation of the SIvers, Boer-Mulders, generalized transversity and worm-gear shifts using two ensembles of gauge configurations with different discretization of the fermion Dirac actions. We discuss factorization and renormalization of the operators and present estimates of lattice discretization artifacts. For these TMD observables, we find...
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Marc Schlegel (New Mexico State University)21/03/2018, 16:30
The feasibility of extracting information on gluon Transverse-Momentum Dependent (TMD) parton distributions, in particular the distribution of linearly polarized gluons, is discussed for the production of quarkonium pairs in proton collisions. Evidences are presented that azimuthal modulations of the cross section, caused by linearly polarized gluons, may be larger for a quarkonium pair in the...
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Simone Rodini (University of Pavia)21/03/2018, 17:00
Higher-twist transverse-momentum dependent parton distributions (TMDs) go beyond the parton model description of a proton as they describe correlations between quarks and gluons. Higher-twist TMDs, however, turn out to be very elusive objects, as they are difficult to extract from experimental data. Twist-3 distributions can be decomposed as a sum of different contributions. In general, these...
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Renaud Boussarie (IFJ Krakow)21/03/2018, 17:30
I will present the theoretical computation methods and several results for exclusive diffractive impact factors at NLO accuracy at small x with saturation, with an emphasis on corrections to light vector meson electroproduction on a dense target. I will discuss the practical use of our results for phenomenological predictions at an Electron-Ion Collider, as well as theoretical questions on...
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Giovanni Antonio Chirilli (University of Regensburg)21/03/2018, 18:00
Abstract:
Low-$x$ evolution of spin-dependent TMDs and spin $g_1$ structure function are relevant for the future Electron Ion Collider.
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Recently, the spin-low-$x$ evolution was obtained in the saturation formalism. Unfortunately, it does not agree with previous result obtained by calculation of perturbative diagrams in the leading log approximation so an independent study on this subject... -
Kresimir Kumericki (University of Zagreb)22/03/2018, 09:00
After a brief reminder about the role of GPDs in the description of hadron structure, I will review what is known about these functions after a decade and a half of experiments and fits to the data, with emphasis on deeply virtual Compton scattering. I will show results of global fits, both in the traditional and in the neural network approach. I will also discuss main challenges for...
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Kazuhiro Tanaka22/03/2018, 09:25
The nucleon generalized parton distributions (GPDs) are accessed by deeply virtual Compton scattering and deeply virtual meson production with lepton beam. A complementary probe with hadron beam is the exclusive pion-induced Drell-Yan process, $\pi^- p \to \ell^+ \ell^- n$, allowing us to access the GPDs at large timelike virtuality [1]. Recent calculations on this process in terms of QCD...
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Michael Engelhardt22/03/2018, 09:50
Quark orbital angular momentum (OAM) in the nucleon can be evaluated
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directly by employing a Wigner function embodying the simultaneous
distribution of parton transverse position and momentum. This
distribution can be accessed via a generalization of the nucleon
matrix elements of quark bilocal operators which have been used
previously in the lattice evaluation of transverse momentum
dependent... -
Prof. Simonetta Liuti (University of Virginia)22/03/2018, 10:15
I will present an analysis of the parton transverse momentum, k_T, substructure of the generalized Wandzura Wilczek relations involving twist three Generalized Parton Distributions. Out of 16 possible Equation of Motion relations that can be written in the T-even sector, I will focus on three helicity configurations that can be detected analyzing specific spin asymmetries: two correspond to...
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Dr Maria Zurita (Brookhaven National Laboratory)22/03/2018, 11:10
Our knowledge of nuclear Parton Distribution Functions is currently limited by the restricted kinematic space covered in fixed target $e+A$ experiments and $p(d)+A$ collisions. In this talk I will present an impact study of the possibilities offered by an Electron-Ion Collider for the improvement of the understanding of collinear factorized nuclear PDFs.
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Felix Hekhorn (Universität Tübingen)22/03/2018, 11:35
We provide a first calculation of the complete next-to-leading order QCD corrections for heavy flavor contributions to the inclusive structure function $g_1$ in longitudinally polarized deep-inelastic scattering. The results are derived with largely analytical methods and retain the full dependence on the heavy quark's mass. We discuss all relevant technical details of the calculation and...
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Henri Hänninen (University of Jyväskylä)22/03/2018, 12:00
We study quantitatively [1] the importance of the recently derived NLO corrections [2,3,4] to the DIS structure functions at small x in the dipole formalism. We show that these corrections can be significant and depend on the factorization scheme used to resum large logarithms of energy into renormalization group evolution with the BK equation. This feature is similar to what has recently been...
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22/03/2018, 14:00
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Prof. Matthew Wing (University College London)22/03/2018, 14:15
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Prof. Leif Lönnblad (Lund University)22/03/2018, 15:00
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Dr Hannes Jung (DESY)22/03/2018, 16:15
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Alexey Vladimirov22/03/2018, 16:45
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Dr Christian Bierlich (Lund University)22/03/2018, 16:55
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Dr Mark Baker22/03/2018, 17:25
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Dr Stefan Gieseke (Karlsruhe Institute of Technology)23/03/2018, 09:00
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Dr Ilkka Helenius (University of Tübingen)23/03/2018, 09:25
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Dr Andrea Bressan (INFN Trieste)23/03/2018, 09:50
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Dr Andrii Verbytskyi (Max-Planck-Institut für Physik)23/03/2018, 10:45
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23/03/2018, 11:10
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Dr Thomas Ullrich (Brookhaven National Laboratory)23/03/2018, 13:30
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Dr Prithwish Tribedy (Brookhaven National Laboratory)23/03/2018, 13:55
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23/03/2018, 14:20
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The discovery of rapidly growing cascade of gluons and sharp non-linear rise of its distributions in DIS experiments at HERA collider provides indirect experimental evidence that proton at high energy is a hugely complex many body quantum system where gluons are the dominant degrees of freedom. By now many studies have been performed in the theoretical front to develop frameworks that extend...
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Hannu Paukkunen (University of Jyväskylä)
The hadroproduction of heavy-flavoured mesons has recently attracted a growing interest within the groups involved in global analysis of proton and nuclear parton distribution functions (PDFs). In particular, the D- and B-meson measurements of LHCb at forward direction are sensitive to gluon PDFs at small x and are one of the few perturbative small-x probes before the next generation...
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We investigate the effect of temperature, strangeness fraction and density of the medium on the in-medium
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properties of the $B_0$ and $B_{s0}$ mesons using QCD sum rules and chiral SU(3) model. We focus on the evaluation
of the in-medium masses and decay constants of above scalar $B_0$ and $B_{s0}$ mesons. In-medium light quark
condensates,$\left\langle \bar{q}q\right\rangle_{\rho_B}$, strange... -
A typical scattering event in any collider experiments usually involve rapidly growing cascade of gluons. At high enough energy this cascade of gluons may occupy all the available final state phase space to such an extent that fusion of multiple gluons to single gluon begin to start. This could eventually develop a thermodynamical detail balance, with the usual multiple gluons produced from...
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