626 citations · 14.4k across the 220 of their papers we have counts for
8 papers · 1 filter
Light-meson masses in an unquenched quark model
Xiaoyun Chen, Jialun Ping, Craig D. Roberts +1
We perform a coupled-channels calculation of the masses of light mesons with the quantum numbers , , by including and components in a…
Parton distribution amplitudes: revealing diquarks in the proton and Roper resonance
Cedric Mezrag, Jorge Segovia, Lei Chang +1
We present the first quantum field theory calculation of the pointwise behaviour of the leading-twist parton distribution amplitudes (PDAs) of the proton and its lightest radial ex…
Structure of the nucleon's low-lying excitations
Chen Chen, Bruno El-Bennich, Craig D. Roberts +3
A continuum approach to the three valence-quark bound-state problem in quantum field theory is used to perform a comparative study of the four lightest bary…
Roper resonance -- solution to the fifty year puzzle
Volker D. Burkert, Craig D. Roberts
For half a century, the Roper resonance has defied understanding. Discovered in 1963, it appears to be an exact copy of the proton except that its mass is 50% greater. The mass is…
Locating the Gribov horizon
Fei Gao, Si-Xue Qin, Craig D. Roberts +1
We explore whether a tree-level expression for the gluon two-point function, supposed to express effects of an horizon term introduced to eliminate the Gribov ambiguity, is consist…
Parity partners in the baryon resonance spectrum
Ya Lu, Chen Chen, Craig D. Roberts +3
We describe a calculation of the spectrum of flavour-SU(3) octet and decuplet baryons, their parity partners, and the radial excitations of these systems, made using a symmetry-pre…
Exposing strangeness: projections for kaon electromagnetic form factors
Fei Gao, Lei Chang, Yu-Xin Liu +2
A continuum approach to the kaon and pion bound-state problems is used to reveal their electromagnetic structure. For both systems, when used with parton distribution amplitudes ap…
Off-shell persistence of composite pions and kaons
Si-Xue Qin, Chen Chen, Cedric Mezrag +1
In order for a Sullivan-like process to provide reliable access to a meson target as becomes spacelike, the pole associated with that meson should remain the dominant feature o…