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...
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...
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...
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...
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...
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...
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...
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.
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...
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...
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...
