XIIth Quark Confinement and the Hadron Spectrum

Session

Section B

2

29 Aug 2016, 15:00

Aristotelis II (Makedonia Palace)

Conveners

Section B

• Jose Luis Goity (Hampton University/Jefferson Lab)

Section B

• Nikolaos Stefanis (Ruhr University Bochum, Germany)

Section B

• Hagop Sazdjian (University Paris-Sud)

Section B

• Nikolaos Stefanis (Ruhr University Bochum, Germany)

Section B

• Jose Luis Goity (Hampton University/Jefferson Lab)

Section B

• Hartmut Wittig (JGU Mainz)

Section B

• Jose Luis Goity (Hampton University/Jefferson Lab)

Section B

• Chueng Ji (North Carolina State University)

Section B

• Nikolaos Stefanis (Ruhr University Bochum, Germany)

Section B

• Hagop Sazdjian (University Paris-Sud)

Description

Section B: Light Quarks
Chiral and soft collinear effective theories; sum rules; lattice; Schwinger-Dyson equations; masses of light quarks; light-quark loops; phenomenology of light-hadron form factors, spectra and decays; structure functions and generalized parton distributions; exotics and glueballs; experiments.
Conveners: J. Goity (Hampton U.), B. Ketzer (Bonn U.), H. Sazdjian (IPN Orsay), N. G. Stefanis (Ruhr U. Bochum), H. Wittig (JGU Mainz)

331. Light-front field theory in the description of hadrons

Chueng Ji (North Carolina State University)

29/08/2016, 15:00

Section B: Light Quarks

We discuss the use of light-front field theory in the descriptions of hadrons.
In particular, we clarify the confusion in the prevailing notion of the equivalence between the infinite momentum frame and the light-front dynamics and the advantage of
the light-front dynamics in hadron physics. As an application, we present our recent work on the flavor asymmetry in the proton sea and identify...

226. Recent results on the meson and baryons spectrum from lattice QCD

Daniel Mohler (Fermilab)

29/08/2016, 15:30

Section B: Light Quarks

I will review recent lattice results on the meson and baryon spectrum with a focus on the determination of hadronic resonance masses and widths using a combined basis of single-hadron and hadron-hadron interpolating fields. I will emphasize how these mostly exploratory calculations differ from traditional lattice QCD spectrum calculations for states stable under QCD.

245. Hadronic matrix elements and distribution amplitudes from lattice QCD

Sara Collins (University of Regensburg)

29/08/2016, 16:00

Section B: Light Quarks

A wealth of information on the properties of hadrons of both
theoretical and experimental interest can be provided by lattice
methods. This includes wavefunctions, their response to electromagnetic, weak
or beyond the Standard Model probes and their internal dynamics in ...

319. Nucleon matrix elements and charges in lattice QCD

Constantia Alexandrou

29/08/2016, 16:30

Section B: Light Quarks

We will discuss the extraction of the axial, scalar and tensor charges using twisted mass fermions with simulations at a physical value of the u and quark mass. In addition, we will discuss the nucleon sigma-terms and compare the results obtained recently within lattice QCD.

288. Meson Form Factors and Deep Exclusive Meson Production Experiments

Prof. Tanja Horn (Catholic University of America)

29/08/2016, 17:30

Section B: Light Quarks

Meson electroproduction data play an important role in our understanding of hadron structure and the dynamics that bind the basic elements of nuclear physics. Pion and kaon form factors are of particular interest as they are connected to the Goldstone modes of chiral dynamical symmetry breaking. The last decade saw a dramatic improvement in precision of charged pion form factor data and new...

158. Roy-Steiner-equation analysis of pion-nucleon scattering

Jacobo Ruiz de Elvira (HISKP, Bonn University)

29/08/2016, 17:30

Section B: Light Quarks

A precise understanding of low-energy pion-nucleon interactions is central for many areas in nuclear and hadronic physics, ranging from the scalar couplings of the nucleon to the long-range part of two-pion-exchange potentials and three-nucleon forces in Chiral Effective Field Theory. We present a calculation that combines the general principles of analyticity, unitarity, and crossing symmetry...

329. CANCELLED Unitary coupled channel approach to diffractive scattering and its application to axial vector states

Ed Berger (Argonne National Laboratory (US))

29/08/2016, 18:00

Section B: Light Quarks

Bernhard Ketzer [Bernhard.Ketzer@cern.ch]

43. Inclusive Cross Sections, Parton Density Functions and the strong coupling at HERA

Stefan Schmitt (Deutsches Elektronen-Synchrotron (DE))

29/08/2016, 18:00

Section B: Light Quarks

A combination is presented of all inclusive deep inelastic cross sections previously published by the H1 and ZEUS collaborations at HERA for neutral and charged current ep scattering for zero beam polarisation. The data were taken at proton beam energies of
920, 820, 575 and 460 GeV and an electron beam energy of 27.5 GeV. The data correspond to an integrated luminosity of about 1 fb −1 and...

75. Nucleon structure functions and longitudinal spin asymmetries

Harleen Dahiya (Dr. B.R. Ambedkar National Institute of Technology)

29/08/2016, 18:20

Section B: Light Quarks

We have analysed the phenomenological dependence of the spin independent ($F_1^{p,n}$ and $F_2^{p,n}$) and the spin dependent ($g_1^{p,n}$) structure functions of the nucleon on the the Bjorken scaling variable $x$ using the unpolarized distribution functions of the quarks $q(x)$ and the polarized distribution functions of the quarks $\mathrm{\Delta }q(x)$ respectively. The chiral constituent quark...

344. CANCELLED: The anomalous triangle singulrity and its implications of threshold enhancements

Qiang Zhao (Insitute of High Energy Physics, Chinese Academy of Sciences)

29/08/2016, 18:30

Section B: Light Quarks

I will review the conditions and properties of the anomalous triangle singularity (ATS) in the transition matrix elements. For certain processes, the ATS condition can be fulfilled and will produce measureable effects in physical observables. In particular, when the ATS threshold is located within the physical regime, it may produce threshold enhancements which can mix with pole structures...

98. Pion-photon transition form factor at low-mid momenta within collinear QCD

Sergey Mikhailov (Joint Institute for Nuclear Research)

29/08/2016, 18:40

Section B: Light Quarks

We consider the predictions and estimate systematically all theoretical uncertainties
of pion-photon transition form factor using the light-cone sum rules at low-mid
momenta-transfer.

143. Pion-eta scalar-isovector 3-coupled channel amplitude fitted to branching ratio as and threshold plus subthreshold parameters

Dr Robert Kaminski (Institute of Nuclear Physics PAS, Krakow, Poland)

29/08/2016, 19:00

Section B: Light Quarks

The low energy (below ~2 GeV) pi-eta channel interaction amplitude becomes an object of interest mainly because of the search for exotic mesons in just beginning to collect data detector GlueX in Jefferson Lab. Finding and interpretation of expected weak signals from these states require a comparison with a very accurate amplitude containing standard (q-bar q) states i.e. a0(980) and a0(1450)....

113. Neutral pion form factor measurement by the NA62 experiment

Monica Pepe (INFN Perugia (IT))

29/08/2016, 19:10

Section B: Light Quarks

The NA62 experiment at CERN collected a large sample of charged kaon decays with a highly efficient trigger for decays into electrons in 2007. The kaon beam represents a source of tagged neutral pion decays in vacuum. A measurement of the electromagnetic transition form factor slope of the neutral pion in the time-like region from ~1 million fully reconstructed pi0 Dalitz decay is presented....

140. Properties of exotic and non-exotic quark-bilinears within the Dyson-Schwinger--Bethe-Salpeter equation approach

Thomas Hilger

29/08/2016, 19:20

Section B: Light Quarks

Results of a sophisticated approach to a comprehensive meson phenomenology within the
rainbow-ladder truncated Dyson-Schwinger--Bethe-Salpeter equation framework are presented
and discussed.
The exotic and non-exotic light and heavy quarkonium mass spectrum in the
spin-0 and spin-1 channel, as well as for tensor mesons is evaluated.
Quasi-exotic counterparts of exotic quarkonia in the...

250. Electromagnetic transition form factor and radiative corrections in decays of neutral pions

Mr Tomas Husek (Charles University (CZ))

29/08/2016, 19:30

Section B: Light Quarks

In this talk we present the Two-hadron saturation (THS) scenario for the PVV correlator and apply it to two important processes of the low energy hadron physics: the Dalitz decay of ${\pi }^0$ and ${\pi }^0\to e^{+}{e}^{-}$. We briefly summarize experimental and theoretical results on the rare decay ${\pi }^0\to e^{+}{e}^{-}$. The notorious $3.3\sigma$ discrepancy between the SM prediction and the experimental...

299. Concurrent approaches to Generalized Parton Distribution modeling: the pion's case

Dr Hervé MOUTARDE (Irfu, CEA, Université Paris-Saclay)

30/08/2016, 15:00

Section B: Light Quarks

The concept of Generalized Parton Distributions promises an understanding of the generation of the charge, spin, and energy-momentum structure of hadrons by their fundamental constituents, quarks and gluons. Forthcoming measurements with unprecedented accuracy at Jefferson Lab and at CERN will presumably challenge our quantitative description of the three-dimensional structure of hadrons. To...

134. The transverse momentum dependent distribution functions of partons. Status and prospects

Ignazio Scimemi (Universidad Complutense (ES))

30/08/2016, 15:30

Section B: Light Quarks

In the last few years we have had a major advance on our understanding
of the motion of partons inside nuclei. This has been achieved recognizing the role
of rapidity divergences in the factorization theorems for transverse momentum dependent cross sections (for Drell-Yan, Semi-inclusive DIS, ee-> 2 hadrons), using effective field theories, performing higher order calculations in...

298. Recent experimental results on hadron structure, GPDs and TMDs

Gerhard Mallot (CERN)

30/08/2016, 16:00

Section B: Light Quarks

A gobal effort is ongoing in the study of transverse-momentum dependent structure functions and in generalised parton distribution functions. Both are linked to orbital angular momentum of quarks and gluons in the nucleon. Recent results from various experiments will be discussed.

10. Exotic Hadrons and Large Nc QCD

Thomas Cohen (University of Maryland)

30/08/2016, 17:30

Section B: Light Quarks

While QCD is the theory underlying hadronic physics, much of our intuition about hadronic states has been developed in the context of the constituent quark model. Exotic states—ones that cannot be described in the simplest version of the quark models with mesons as a quark-antiquark state and baryons as a three quark state—are important since they clarify the limitation of the quark model as...

255. Hadron Scattering, Resonances and QCD

Raul Briceno (Thomas Jefferson National Accelerator Facillity)

30/08/2016, 17:30

Section B: Light Quarks

The non-perturbative nature of quantum chromodynamics (QCD) has historically left a gap in our understanding of the connection between the fundamental theory of the strong interactions and the rich structure of experimentally observed phenomena. For the simplest properties of stable hadrons, this is now circumvented by utilizing lattice QCD (LQCD). In this talk I outline a path towards a...

31. On the description of the exotic states within QCD sum rules

Dmitri Melikhov (HEPHY)

30/08/2016, 17:50

Section B: Light Quarks

The method of QCD sum rules is based on the extraction of hadron observables (decay constants, form factors, etc) from the correlation functions of the appropriate quark currents. Because of the properties of the correlation functions containing the exotic multiquark (i.e. four-quark, five-quark) currents, the contribution of the exotic multiquark hadrons to these correlation functions emerge...

235. Finite-volume techniques in lattice hadron spectroscopy

Max Hansen

30/08/2016, 18:00

Section B: Light Quarks

Numerical Lattice QCD calculations are necessarily performed in a finite volume and with Euclidean time. For scattering and transition amplitudes these constraints have important consequences. In particular, it is not possible to directly access such amplitudes from numerically determined Euclidean correlators. In the past decades, great progress has been made to overcome this limitation by...

17. Dispersive approach to QCD and hadronic contributions to electroweak observables

Alexander Nesterenko (Joint Institute for Nuclear Research)

30/08/2016, 18:10

Section B: Light Quarks

The dispersive approach to QCD, which extends the applicability range of
perturbation theory towards the infrared domain, is applied to the study
of the hadronic vacuum polarization function and related quantities. This
approach merges the intrinsically nonperturbative constraints, which
originate in the kinematic restrictions on the relevant physical
processes, with corresponding...

163. OPE of Green functions in the odd sector of QCD

Tomas Kadavy (Charles University in Prague)

30/08/2016, 18:30

Section B: Light Quarks

A review of familiar results of the three-point Green functions of currents in the odd-intrinsic parity sector of QCD is presented. Such Green functions include very well-known examples of $VVP,VAS$ or $AAP$ correlators. We also present new results for $VVA$ and $AAA$ Green functions that have not yet been studied extensively in the literature before, more importantly with a phenomenological...

162. The Neutron Electric Dipole Moment from lattice QCD

Dr Andreas Athenodorou (University of Cyprus)

30/08/2016, 18:30

Section B: Light Quarks

We calculate the neutron electric dipole moment within the framework of lattice QCD. In particular we
analyze configurations produced with $N_f=2+1+1$ twisted mass fermions with light quark mass which
corresponds to pion mass of 370 MeV. We do so by extracting the $CP$-odd form factor $F_3$ at the limit of
zero momentum transfer and at small values of the $\theta$ vacuum angle. The zero...

249. CANCELLED: Polarizability of pseudoscalar mesons from the lattice calculations

Dr Elena Luschevskaya (State Scientific Center of Russian Federation - Institute of Theoretical and Experimental Physics)

30/08/2016, 18:50

Section B: Light Quarks

We explore the ground state energy of pseudoscalar charged and neutral mesons as a function of external magnetic field in SU(3) lattice gauge theory. We calculate the dipole magnetic polarizabilities and hyperpolarizabilities of charged and neutral pseudoscalar pi and K mesons. It was found that the magnetic polarizability of charged pion agrees with the experimental prediction of COMPASS...

273. Scheme variations of the QCD coupling and phenomenological applications

Dr Matthias Jamin (ICREA & IFAE)

30/08/2016, 18:50

Section B: Light Quarks

The Quantum Chromodynamics (QCD) coupling, αs, is not a physical observable of the theory since it depends on conventions related to the renormalization procedure. We introduce a definition of the QCD coupling, denoted by αˆs, whose running is explicitly renormalization scheme invariant. The scheme dependence of the new coupling αˆs is parameterized by a single parameter C, related to...

107. A data-driven model-independent approach to ${\pi }^0,\eta$ and ${\eta }^{\prime }$ single and double Dalitz decays

Dr Rafel Escribano (Universitat Autònoma de Barcelona)

30/08/2016, 19:10

Section B: Light Quarks

The
dilepton invariant mass spectra and branching ratios of the single and double Dalitz decays
$\mathcal{P}\to {\ell }^{+}{\ell }^{-}\gamma$ and $\mathcal{P}\to {\ell }^{+}{\ell }^{-}{\ell }^{+}{\ell }^{-}$
($\mathcal{P}={\pi }^0,\eta ,{\eta }^{\prime }$; $\ell =e$ or $\mu$) are predicted by means of a
data-driven model-independent approach based on the use of rational approximants applied to
${\pi }^0,\eta$...

322. H-dibaryon spectroscopy using modern lattice methods

Dr Parikshit Junnarkar (Helmholtz-Institute Mainz)

30/08/2016, 19:10

Section B: Light Quarks

Studies of multi-baryon systems present a formidable challenge to lattice QCD.
The H-dibaryon represents the simplest multi-baryon system and yet in the current lattice calculations at unphysical quark masses no conclusive results can be seen regarding its binding energy.
One of the contributing factors could be the inability to reliably extract the spectrum of states on the lattice.
Using...

56. Pion and Kaon Properties from Dyson-Schwinger Equations

Peter Tandy (Kent State University, USA)

01/09/2016, 14:30

Section B: Light Quarks

We summarize results on the internal structure and properties of the pion and kaon as an illustration of how insights into hadron physics can be obtained from calculations based on the Dyson-Schwinger equations of QCD. The light pseudoscalar mesons are the best possible case for such considerations as the approach is very well-constrained by symmetries and there is direct connection to...

135. Chiral-Scale Perturbation Theory and the Renormalization Group

Lewis Tunstall (University of Bern)

01/09/2016, 15:00

Section B: Light Quarks

Three-flavor chiral perturbation theory with $t,b,c$ quarks decoupled tests the infrared limit of three-flavor QCD. The standard theory $\chi$PT${}_3$ (before being unitarized) assumes that there is no infrared fixed point ${\alpha }_{\mathrm{IR}}$. If ${\alpha }_{\mathrm{IR}}$ exists, we get chiral-scale perturbation theory $\chi$PT${}_{\sigma }$ about a scale-invariant theory where the quark condensate...

61. Constrains on the NLO coefficients in S=-1 sector.

Albert Feijoo (Universitat de Barcelona)

01/09/2016, 15:30

Section B: Light Quarks

The precise SIDDHARTA value of the energy shift and width of kaonic hydrogen has awaken a renewed interest for the meson-baryon interaction in the $S=-1$ sector. Our study has been carried out based on a chiral SU(3) Lagrangian up to next-to-leading order (NLO) and implementing unitarization in coupled channels, since the presence of $\mathrm{\Lambda }(1405)$ resonance makes not applicable a...

52. The role of the strange quark in the $\rho (770)$ meson

Dr Raquel Molina (The George Washington University)

01/09/2016, 15:50

Section B: Light Quarks

Recently, the GWU lattice group has evaluated high-precision phase-shift data for $\pi \pi$ scattering in the $I=1$, $J=1$ channel. Unitary Chiral Perturbation Theory describes these data well around the resonance region and for different pion masses. Moreover, it allows to extrapolate to the physical point and estimate the effect of the missing $K\overline{K}$ channel in the two-flavor lattice...

136. Mesons and baryons in ultra-intense magnetic field: an evaded collapse

Prof. Boris Kerbikov (ITEP and Lebedev)

01/09/2016, 16:10

Section B: Light Quarks

Huge magnetic fields (MF) up to eB value of the order of the QCD Lambda square are created
for a short time in peripheral heavy ion collisions at RHIC and LHC.The field about four
orders of magnitude less is anticipated to operate in magnetars.This brought about an
extraordinarly large interest to the behavior of quark systems (mesons and baryons) in strong MF.In a series of papers we...

278. The RHIC Spin Program

Elke-Caroline Aschenauer (BNL)

01/09/2016, 17:00

Section B: Light Quarks

A myriad of new techniques and technologies made it possible to inaugurate the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory as the world's first high-energy polarized proton collider in December 2001. RHIC delivers polarized proton-proton collisions at center-of-mass energies of up to 500 GeV. This unique environment provides opportunities to study the polarized...

186. Polarized Drell-Yan at COMPASS

Riccardo Longo (Universita e INFN Torino (IT))

01/09/2016, 17:30

Section B: Light Quarks

The COMPASS experiment at CERN took the first ever polarized Drell-Yan data in 2015. The muon pairs originating from pion induced collisions provide a way of accessing the transverse
momentum dependent parton distribution functions of the nucleon. The study of the azimuthal spin asymmetries in Drell-Yan complements a wealth of results already obtained from transversely polarized semi-inclusive...

29. Recent results from CMD-3 at VEPP-2000

Simon Eydelman (Budker Institute of Nuclear Physics (RU))

01/09/2016, 17:50

Section B: Light Quarks

Regular operation of the VEPP-2000 electron-positron collider started at the end of 2010 and about 60 pb${}^{-1}$ were collected so far by the CMD-3 detector in the whole available c.m. energy range from 0.32 GeV to 2.0 GeV. These measurements allow improvements in the precision of the predicted value of the muon anomalous magnetic moment. We report here current results of analysis of the...

126. Resonance production and decay in pion induced collisions with HADES

Federico Scozzi

01/09/2016, 18:10

Section B: Light Quarks

The main goal of the High Acceptance Di-Electron experiment (HADES) [1] at GSI is the study of hadronic matter in the $1-3.5$ GeV/nucleon incident energy range. The obtained dilepton spectra measured in nucleon-nucleon, nucleon-nucleus and heavy-ion reactions at various beam energies demonstrate important contributions from baryon resonances decays ($R\to N{e}^{+}{e}^{-}$). The...

129. $3\pi$ resonance poles from COMPASS data

Mikhail Mikhasenko (Universitaet Bonn (DE))

01/09/2016, 18:30

Section B: Light Quarks

High-energy peripheral reactions provide an excellent opportunity to study the excitation spectrum of hadrons. The COMPASS experiment at CERN has measured the diffractive scattering of pions to the 3-pion final state with unprecedented statistical precision. Partial wave analysis techniques have been employed to obtain an expansion of the reaction cross section in terms of partial waves with...

114. Hadron Reaction and Spectroscopy Studies at JPAC

Alessandro Pilloni (Jefferson Lab)

02/09/2016, 15:00

Section B: Light Quarks

I will review activities of the Joint Physics Analysis Center

326. Light-Meson Spectroscopy at COMPASS

Fabian Michael Krinner (Technische Universitaet Muenchen (DE))

02/09/2016, 15:30

Section B: Light Quarks

The goal of the COMPASS experiment at CERN is to study the structure and dynamics of hadrons. The two-stage spectrometer used by the experiment has good acceptance and covers a wide kinematic range for charged as well as neutral particles allowing to access a wide range of reactions. Light mesons are studied with negative (mostly ${\pi }^{-}$) and positive ($p$, ${\pi }^{+}$) hadron beams with a...

339. CANCELLED: Baryon Spectroscopy: Recent Results and Impact

Prof. Reinhard Beck (University Bonn)

02/09/2016, 16:00

Section B: Light Quarks

The nucleon excitation scheme has been under intensive investigation with meson photoproduction experiments during the last few years world wide. Currently, a lot of new experimental results are coming out from the CLAS experiment at Jlab, the Crystal Barrel experiment at the ELSA accelerator in Bonn and the Crystal Ball experiment at the MAMI accelerator in Mainz. These experiments focus on...

341. Recent Results on Light Meson Decays at BES III

Prof. Achim Denig (Johannes Gutenberg University Mainz)

02/09/2016, 16:30

Section B: Light Quarks

We report on BESIII measurements of the timelike pion form factor obtained via the initial state radiation technique, the decays of ${\eta }^{\prime }$ into the final states ${\pi }^{+}{\pi }^{-}\gamma$, $e^{+}{e}^{-}\gamma$ as well as the observation of the ${\eta }^{\prime }$ decay into $\omega e^{+}{e}^{-}$.

33. Flavour decomposition of electromagnetic transition form factors of nucleon resonances

Dr Jorge Segovia

02/09/2016, 17:30

Section B: Light Quarks

Strong diquark correlations inside baryons is a consequence of two emergent phenomena in Quantum Chromodynamics (QCD): dynamical chiral symmetry breaking and confinement. That is to say, any interaction capable of creating pseudo-Goldstone modes as bound-states of a light dressed-quark and -antiquark, will necessarily also generate strong colour-antitriplet correlations between any two dressed...

111. Hadron properties from nPI: towards first principles results

Dr Richard Williams (University of Giessen)

02/09/2016, 17:50

Section B: Light Quarks

The Green's functions of QCD encode the properties of hadrons,
with the appearance of (colour singlet) poles in n-point functions
corresponding to bound-states and resonances. There are several
techniques by which such information may be extracted, including
lattice QCD and functional methods. We discuss recent progress in
applying nPI effective action techniques to the systematic...

79. Quark Propagator with electroweak interactions in the Dyson-Schwinger approach

Walid Mian (University of Graz)

02/09/2016, 18:10

Section B: Light Quarks

By β-decay a Neutron transforms into a Proton and emits a Positron and a Neutrino. The latter only interacts weakly. During Neutron Star formations and mergers, we have a high Neutrino flux, which can be measured. Therefore by Neutrino measurement, we can learn about the inner structure of Neutron Star formations and mergers. Because during these processes the matter is dense, we have a back...

142. Exotic and excited states from functional approaches

Prof. Christian Fischer (Institute for Theoretical Physics, JLU Giessen)

02/09/2016, 18:30

Section B: Light Quarks

We summarise recent advances on the description of exotic and excited states
using an approach to QCD via Dyson-Schwinger and Bethe-Salpeter equations.
We discuss first steps in the calculation of (quenched) glueball states, explain
in more detail methods and results to extract the spectrum of four-(anti-)quark
states from the four-body Faddeev-Yakubovski equation and present first...

170. CANCELLED: Dual parametrization of the GPDs v.s. the Mellin - Barnes transform approach and the J = 0 fixed pole

Kirill Semenov-Tian-Shansky

Section B: Light Quarks

The dual parametrization of of generalized parton distributions (GPDs) and the
Mellin-Barnes integral approach represent two frameworks for handling the double
partial wave expansion of GPDs in the conformal partial waves and in the cross-channel
$\mathrm{S}\mathrm{O}(3)$ partial waves. We explicitly show the complete equivalence of these two independently developed GPD representations. This provides...

20. CANCELLED: Excited states from the Bethe-Salpeter equation in Minkowski space

Cristian Gutierrez (IFT-Unesp)

Section B: Light Quarks

We compute for first time the spectrum of the Bethe-Salpeter equation, for a system composed of two bosons exchanging a massive scalar. The ladder approximation for the kernel is used. This study is performed directly in the Minkowski space by using the Nakanishi representation of the Bethe-Salpeter amplitude and the projection onto the null plane or light-front projection. The eigenvalues,...