Bound states in strongly coupled systems

Session

QCD theory/phenomenology

12 Mar 2018, 10:00

GGI

49. Multiquarks Hadrons and QCD with Many Colours

Prof. Luciano Maiani (ROMA1)

12/03/2018, 10:00

26. An approach to QCD bound states

Prof. Paul Hoyer (University of Helsinki)

12/03/2018, 10:30

Light hadrons are relativistic, strongly bound states with large gluon and sea quark distributions. Interestingly, hadrons also have properties akin to non-relativistic atoms, despite confinement and chiral symmetry breaking. Hadron quantum numbers appear to be determined by the valence quarks only. The quark model is quite successful, especially for quarkonia. The OZI rule and duality provide...

45. Production of light mesons in central diffractive pp collisions

Dr Piotr Lebiedowicz (Institute of Nuclear Physics, Polish Academy of Sciences)

12/03/2018, 11:30

We discuss central exclusive diffractive production of light mesons in the reactions $pp\to pp{\pi }^{+}{\pi }^{-}$ and $pp\to pp{K}^{+}{K}^{-}$ at high energies. The calculation is based on a tensor pomeron model [1] and the amplitudes for the processes are formulated in an effective field-theoretic approach. We include a purely diffractive dipion continuum, the scalar and tensor resonances...

47. Relativistic three-particle bound states in a box

Dr Maxwell Hansen (CERN)

12/03/2018, 12:00

Numerical lattice QCD calculations are necessarily restricted to a finite volume and this can significantly modify observables, especially those involving multi-hadron states. Over the past few years, great progress has been made in deriving and generalizing quantization conditions that relate finite-volume energies to infinite-volume two- and three-particle scattering amplitudes. Using a...

16. Unitarity constraint on three-to-three scattering amplitude

Dr Maxim Mai (The George Washington University)

12/03/2018, 12:30

Parameterizing the two-body scattering amplitude by an isobar in each partial wave, we are able to express the three-body scattering amplitude in terms of the isobar propagator and isobar-spectator scattering amplitude in terms of Bethe-Salpeter equation. Analytic properties of all building blocks are determined exactly, imposing three-body unitarity. Subsequently dispersion relations are used...

24. Confinement Criteria and the Higgs Mechanism

Dr Jeff Greensite (San Francisco State University)

12/03/2018, 14:30

Although color neutrality of the QCD spectrum is the historical definition of confinement, we know that a color neutral particle spectrum is also a feature of gauge-Higgs theories in the Higgs regime, and this means that such theories are also “confining,” at least by the historical definition. In this talk I will suggest that a confinement property stronger than color neutrality, which...

14. The string-junction picture of multiquark states

Giancarlo Rossi (ROMA2)

12/03/2018, 15:00

We start with a discussion of hadronic duality recalling why in the presence of baryons one needs to introduce the notion of string-junction J, to complement the conventional classification of hadrons based just on their quark-antiquark constituents. In this picture single hadronic states are associated with "irreducible" gauge-invariant operators consisting of Wilson lines (visualized as...

2. Supersymmetric Features of Hadron Physics and other Novel Properties of Quantum Chromodynamics from Light-Front holography and Superconformal Algebra

Prof. Stanley J. Brodsky (SLAC National Accelerator Laboratory, Stanford University)

12/03/2018, 15:30

A fundamental question in hadron and nuclear physics is how the mass scale for protons and other hadrons emerges from QCD, even in the limit of zero quark mass. I will discuss a new approach to the origin of the QCD mass scale and color confinement based on "lightfront holography", a formalism which relates the bound-state amplitudes in the fifth dimension of AdS space to the...

37. Baryons in the Dyson-Schwinger approach

Dr Gernot Eichmann (IST Lisboa)

12/03/2018, 16:30

I will present results for light and strange baryons in the Dyson-Schwinger/Bethe-Salpeter approach. Their ground-state properties obtained from three-quark and quark-diquark calculations agree well, and with a few exceptions also the excited-state spectra can be well reproduced and interpreted from their underlying diquark structure. The formalism provides a path towards addressing multiquark...

22. Solving the Homogeneous Bethe-Salpeter Equation in Minkowski space

Giovanni Salme' (INFN - ROMA)

12/03/2018, 17:00

Recently a new formal tool, based on both the Nakanishi integral representation of the Bethe-Salpeter amplitude and the so called light-front projection, has been adopted for obtaining actual solutions of the Bethe-Salpeter equation. A wide investigation of both spectra and light-cone momentum distributions have been carried on for bound systems with and without spin degrees of freedom, in...

3. Bound States and Spectral Models

Prof. Enrique Ruiz Arriola (Universidad de Granada)

13/03/2018, 14:30

We apply the gauge technique to conserved currents and look for the consequences for bound states.

9. Lattice QCD studies of pseudo-PDFs

Dr Savvas Zafeiropoulos (Universität Heidelberg)

13/03/2018, 15:00

Ioffe-time distributions, which are functions of the Ioffe-time ν, are the Fourier transforms of parton distribution functions with respect to the momentum fraction variable x. These distributions can be obtained from appropriate equal time, quark bilinear hadronic matrix elements which can be calculated from first principles via lattice QCD methods. Here, we present the first numerical...

18. Energy-momentum tensor for unpolarized proton target

Dr Arkadiusz TRAWINSKI (CEA)

16/03/2018, 09:30

The expectation value of the quantum energy-momentum tensor (EMT) for an unpolarized proton target in the Breit frame can be matched with an anisotropic perfect fluid EMT. This matching offers the possibility of interpreting the EMT form factors in terms of the internal energy and transverse/radial pressure inside an unpolarized proton target. The generalization of this result to a more...

31. Dispersive Analysis of Mesonic 3-Body Decays

Mr Tobias Isken (HISKP, University of Bonn)

16/03/2018, 10:00

I will present a dispersive analysis of mesonic 3-body decay amplitudes based on the fundamental principles of analyticity and unitarity. In this framework the leading final-state interactions are fully taken into account. The first part of the talk will focus on the ${\eta }^{\prime }\to \eta \pi \pi$ decay channel [arXiv:1705.04339 [hep-ph]]. This decay offers several features of interest: due to...