497 citations · 1.6k across the 25 of their papers we have counts for
6 papers · 1 filter
Meson-like Baryons and the Spin-Orbit Puzzle
Nathan Isgur
I describe a special class of meson-like Λ_Q excited states and present evidence supporting the similarity of their spin-independent spectra to those of mesons. I then examine spin…
Critique of a Pion Exchange Model for Interquark Forces
Nathan Isgur
I describe four serious defects of a widely discussed pion exchange model for interquark forces: it doesn't solve the "spin-orbit problem" as advertised, it fails to describe the i…
Comment on "Valence QCD: Connecting QCD to the Quark Model"
Nathan Isgur
I criticize certain conclusions about the physics of hadrons drawn from a "valence QCD" approximation to QCD.
Nonresonant Semileptonic Heavy Quark Decay
Nathan Isgur
In both the large N_c limit and the valence quark model, semileptonic decays are dominated by resonant final states. Using Bjorken's sum rule in an "unquenched" version of the quar…
Flux Tube Zero-Point Motion, Hadronic Charge Radii, and Hybrid Meson Production Cross Sections
Nathan Isgur
Flux tube zero-point motion produces quark displacements transverse to the flux tube which make significant contributions to hadronic charge radii. In heavy quark systems, these co…
Beyond the Adiabatic Approximation: the impact of thresholds on the hadronic spectrum
Nathan Isgur
In the adiabatic approximation, most of the effects of quark-antiquark loops on spectroscopy can be absorbed into a static interquark potential. I develop a formalism which can be…