Conveners
Parallel 1: Renormalization group procedure for effective particles
- Arkadiusz Trawiński
Parallel 1: Field theories in the front form - Gauge theories on the light front
- Wayne Polyzou (University of Iowa)
Parallel 1: Chiral symmetry and QCD at finite temperature
- Urko Reinosa (CPHT - Ecole Polytechnique - CNRS)
Parallel 1: Hadronic structure - Generalized parton distributions
- Hervé Moutarde
Parallel 1: Hadron structure - New parton distributions
- Matthias Burkardt (New Mexico State University)
Parallel 1: Field theories in the front form - Light-front quantization
- Chueng-Ryong Ji (North Carolina State University)
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Stanislaw D. Glazek (University of Warsaw)16/09/2019, 14:45Effective field theories
Small-x divergences of a canonical Hamiltonian of Abelian gauge theory in the front form of quantum dynamics, are regulated using a mass parameter for gauge bosons, introduced through a mechanism analogous to the spontaneous breaking of global gauge symmetry [1]. The regularization includes addition of the third polarization state for massive vector bosons. A corresponding family of...
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Kamil Serafin (University of Warsaw)16/09/2019, 15:10Effective field theories
We present preliminary results for form factors and structure functions
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of some of spin-$0$, spin-$1/2$ and spin-$1$ heavy quarkonia and triply-heavy
baryons in heavy flavor QCD. Using renormalization group procedure for
effective particles (RGPEP) and gluon mass ansatz, approximate Hamiltonians
for heavy quarkonia and triply-heavy baryons in QCD were found [1,2].
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Maria Gomez-Rocha (University of Granada)16/09/2019, 15:35Effective field theories
A Wilsonian approach to $\pi\pi$ scattering based in the Glazek-Wilson Similarity Renormalization Group for Hamiltonian is analyzed in the $JI=$00, 11 and 20 channels in momentum space up to a maximal CM energy of $\sqrt{s}=1.4$ GeV. We identify the Hamiltonian by means of the 3D reduction of the Bethe-Salpeter equation in the Kadyschevsky scheme. We propose a new method to integrate the SRG...
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Alfredo T. Suzuki (La Sierra University)16/09/2019, 16:30Field theories in the front form
The Ward-Takahashi identity in quantum electrodynamics ($QED_4$) first considered by J. C. Ward and Y. Takahashi, correlates the wave function renormalization for the electron to its vertex renormalization function, guaranteeing the cancellation of ultraviolet (UV) divergences to all orders of perturbation theory.
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Since QED in the light-cone gauge is a constrained theory that brings a more... -
Oscar A. Sánchez (Instituto de Física Teórica - UNESP)16/09/2019, 16:55Field theories in the front form
Epstein-Glaser’s ideas for the formulation of a distributional well-defined perturbative causal field theory are developed in light-front dynamics over the invariant null-plane coordinatization introduced by Rohrlich. Explicitly, the causality theorems which warrant the method are shown to remain valid in that dynamics, and the causal distribution splitting formulae are re-derived in...
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Sergey Bragin (Max Planck Institute for Nuclear Physics)16/09/2019, 17:20Field theories in the front form
Recent development of the laser technologies for the production of extreme intensities has made high-power lasers a practical tool for studying subatomic world at the intensity frontier [1], complementary to the energy frontier. From the theoretical point of view, an intense laser field can be normally represented as a classical background plane-wave field. Because of the high intensity, the...
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Guillaume Beuf16/09/2019, 17:45Field theories in the front form
Mass renormalization for gauge theories in light-front perturbation theory (LFPT) has been a longstanding puzzle, leading to apparently inconsistant results in the literature. In this talk, I will show how to implement a fully Poincaré invariant UV regularization for LFPT calculations, like for example dimensional regularization. Within this approach, one obtains consistent and unambiguous...
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Julien Serreau (Université Paris Diderot)17/09/2019, 14:45QCD at finite temperature
Lattice simulations of Yang-Mills theories and QCD in the Landau gauge demonstrate that the gluon propagator saturates at vanishing momentum. This can be modelled by a massive deformation of the corresponding Faddeev-Popov Lagrangian known as the Curci-Ferrari model. The latter does not modify the known ultraviolet regime of the theory and provides a successful perturbative description of...
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Andrea V. Rodríguez (Universidad Complutense de Madrid)17/09/2019, 15:10QCD at finite temperature
We analize the role played by the thermal $f_0(500)$ state or $\sigma$ in chiral symmetry restoration. The temperature corrections to the spectral properties of that state are included in order to provide a better description of the scalar susceptibility $\chi_S$ around the transition region. We use the Linear Sigma Model to establish the relation between $\chi_S$ and the $\sigma$ propagator,...
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Usha Kulshreshtha (Kirori Mal College, University of Delhi)17/09/2019, 15:35QCD at finite temperature
In this talk I will consider the boson stars in a theory of complex scalar filed in the presence of gravity and the the U(1) gauge field and the gluon field. I will discuss the results for the phase diagrams of the boson star solutions in this theory.
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Ho San KO (Paris-Sud University)17/09/2019, 16:30Hadronic structure
Deeply Virtual Compton Scattering (DVCS) is the simplest exclusive process to access Generalized Parton Distributions (GPDs). GPDs encode the correlation between the spacial distribution of partons inside the nucleon and their momentum. An upcoming DVCS experiment in Hall C at Jefferson Lab (Virginia, U.S.A.) will provide the highest precision data in a vast Q$^2$- x$_B$ region accessible by a...
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Cédric Mezrag (INFN Roma 1)17/09/2019, 16:55Hadronic structure
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Samuel Wallon17/09/2019, 17:20Hadronic structure
In the framework of collinear QCD factorization, we study the
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photoproduction of a gamma meson pair with a large invariant mass and a small transverse momentum, as a new way to access generalized parton distributions (GPDs), in both chiral-even and chiral-odd sectors. In the kinematics of JLab~12-GeV, we demonstrate the feasibility of this measurement. -
Pierre Chatagnon (IPN Orsay)17/09/2019, 17:45Hadronic structure
Generalized Parton Distributions (GPDs) describe correlations between the longitudinal momentum and the transverse position of the partons inside the nucleon . GPDs have been studied in many experiments worldwide mainly using Deeply Virtual Compton Scattering (DVCS, ep → e’p’γ).
This talk will highlight the measurement of the time-reversal conjugate process of DVCS, Timelike Compton...
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17/09/2019, 18:10
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Shohini Bhattacharya (Temple University)18/09/2019, 14:45Hadronic structure
Studying light-cone PDFs through Euclidean correlators is currently an active field of research. In particular, the concept of quasi parton distributions (quasi-PDFs) is at the forefront of numerical calculation of partonic structure of strongly interacting systems on lattice using QCD. Quasi-PDFs converge to their respective standard distributions if the hadron momentum goes to infinity. We...
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Savvas Zafeiropoulos (Universität Heidelberg)18/09/2019, 15:10Hadronic structure
The light-cone definition of Parton Distribution Functions (PDFs) does not allow for a direct ab initio determination employing methods of Lattice QCD simulations that naturally take place in Euclidean spacetime. In this presentation we focus on pseudo-PDFs where the starting point is the equal time hadronic matrix element with the quark and anti-quark fields separated by a finite distance. We...
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Matteo Rinaldi (Dipartimento di Fisica e Geologia. Università degli studi di Perugia. INFN section of Perugia.)18/09/2019, 15:35Hadronic structure
Here we discuss the main outcomes of our investigations on the so called double parton distribution functions (dPDFs). These quantities can be obtained via double parton scattering processes (DPS) in high energy proton-proton and proton nucleus collisions. These new and experimentally unknown distributions represent a novel and promising complementary tool, w.r.t. TMDs and GPDs, to access the...
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Chandan Mondal (Institute of Modern Physics, Chinese Academy of Sciences)18/09/2019, 16:30Field theories in the front form
Basis light-front quantization is a nonperturbative approach which has been developed for solving many-body bound state problems in quantum field theories. We have applied this approach to investigate the structure of the pion using a light front effective Hamiltonian in the constituent quark-antiquark representation. The remarkable results for the electromagnetic (EM) form factor,...
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Xingbo Zhao (Institute of Modern Physics, Chinese Academy of Sciences)18/09/2019, 16:55Field theories in the front form
We solve for the mass spectrum and structure of the positronium, the bound state formed by an electron and a positron, from the first-principles of QED. We adopt a nonperturbative approach based on light-front Hamiltonian formalism, named Basis Light-front Quantization. In this calculation we include the lowest two Fock sectors, $|e^+e^-\rangle$ and $|e^+e^-\gamma\rangle$, in the basis. We...
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Lubomir Martinovic (LTF JINR Dubna and Inst. of Physics SAS Bratislava)18/09/2019, 17:20Field theories in the front form
We give a survey of a few subtle mathematical points whose correct treatment is necessary for obtaining noncontradictory structure of the front form of the field theory and its physical predictions. First, we show that small imaginary parts in the exponents of the light-front (LF) two-point functions (convergence factors) are mandatory for their correct equal-LF time limit and for vanishing...
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Alfredo Suzuki18/09/2019, 17:45Field theories in the front form
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Daya S. Kulshreshtha (University of Delhi)18/09/2019, 18:10Field theories in the front form
In this talk I would consider in details the role of the light-front coordinates in string theory.
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