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in the Diabatic Diquark Model: Effects of Isospin
Richard F. Lebed, Steven R. Martinez
is an isoscalar 4-quark state with mass lying barely below the threshold, and several times further below the threshold. It allows both di-meso…
Diabatic Dynamical Diquark Bound States: Mass Corrections and Widths
Richard F. Lebed, Steven R. Martinez
Using the diabatic formalism, which generalizes the adiabatic approximation in the Born-Oppenheimer formalism, we apply well-known Hamiltonian methods to calculate the effect of op…
Theory of the (Heavy-Quark) Exotic Hadrons: A Primer for the Flavor Community
Richard F. Lebed
Scores of exotic hadrons, particularly tetraquarks and pentaquarks in the heavy-quark sector, have been observed in the past 20 years, and more continue to be discovered to this da…
Exotic Hadrons from Scattering in the Diabatic Dynamical Diquark Model
Richard F. Lebed, Steven R. Martinez
The diabatic framework generalizes the adiabatic approximation built into the Born-Oppenheimer (BO) formalism, and is devised to rigorously incorporate the mixing of BO-approximati…
The case for an EIC Theory Alliance: Theoretical Challenges of the EIC
Raktim Abir, Igor Akushevich, Tolga Altinoluk +167
We outline the physics opportunities provided by the Electron Ion Collider (EIC). These include the study of the parton structure of the nucleon and nuclei, the onset of gluon satu…
Diabatic Representation of Exotic Hadrons in the Dynamical Diquark Model
Richard F. Lebed, Steven R. Martinez
We apply the diabatic formalism, an extension of the adiabatic approximation inherent to the Born-Oppenheimer (BO) approach of atomic physics, to the problem of mixing between exot…
Substructure of Multiquark Hadrons (Snowmass 2021 White Paper)
Nora Brambilla, Hua-Xing Chen, Angelo Esposito +27
In recent years there has been a rapidly growing body of experimental evidence for existence of exotic, multiquark hadrons, i.e. mesons which contain additional quarks, beyond the…
All Heavy Tetraquarks: The Dynamical Diquark Model and Other Approaches
Richard F. Lebed
The 2020 announcement by LHCb of a narrow structure in the di- spectrum -- a potential state -- has opened a new era in hadronic spectroscopy. In t…
Fine Structure of Pentaquark Multiplets in the Dynamical Diquark Model
Jesse F. Giron, Richard F. Lebed
We apply the dynamical diquark model to predict the spectrum of hidden-charm pentaquark states in both unflavored and open-strange sectors. Using only Hamiltonian parameters introd…
Spectrum of Hidden-Charm, Open-Strange Exotics in the Dynamical Diquark Model
Jesse F. Giron, Richard F. Lebed, Steven R. Martinez
The observation by BESIII and LHCb of states with hidden charm and open strangeness () presents new opportunities for the development of a global model of heavy-qu…
Radiative Transitions of Charmoniumlike Exotics in the Dynamical Diquark Model
Justin M. Gens, Jesse F. Giron, Richard F. Lebed
Using the dynamical diquark model, we calculate the electric-dipole radiative decay widths to of the lightest negative-parity exotic candidates, including the four ,…
The Simple Spectrum of States in the Dynamical Diquark Model
Jesse F. Giron, Richard F. Lebed
We develop the spectroscopy of and other all-heavy tetraquark states in the dynamical diquark model. In the most minimal form of the model (e.g., each diquark app…
Spectrum of the Hidden-Bottom and the Hidden-Charm/Strange Exotics in the Dynamical Diquark Model
Jesse F. Giron, Richard F. Lebed
The lightest hidden-bottom tetraquarks in the dynamical diquark model fill an -wave multiplet consisting of 12 isomultiplets. We predict their masses and dominant bottomonium de…
The Spectrum of -Wave Hidden-Charm Exotic Mesons in the Diquark Model
Jesse F. Giron, Richard F. Lebed
We study the fine structure in the spectrum of known and predicted negative-parity hidden-charm exotic meson states, which comprise the lowest -wave multiplet in the dynamical d…
Precision Model-Independent Bounds from Global Analysis of Form Factors
Thomas D. Cohen, Henry Lamm, Richard F. Lebed
We present a model-independent global analysis of hadronic form factors for the semileptonic decays that exploits lattice-QCD data, dispersion relations, and…
The Dynamical Diquark Model: Fine Structure and Isospin
Jesse F. Giron, Richard F. Lebed, Curtis T. Peterson
We incorporate fine-structure corrections into the dynamical diquark model of multiquark exotic hadrons. These improvements include effects due to finite diquark size, spin-spin co…
The Dynamical Diquark Model: First Numerical Results
Jesse F. Giron, Richard F. Lebed, Curtis T. Peterson
We produce the first numerical predictions of the dynamical diquark model of multiquark exotic hadrons. Using Born-Oppenheimer potentials calculated numerically on the lattice, we…
Tests of the Standard Model in , and
Thomas D. Cohen, Henry Lamm, Richard F. Lebed
A number of recent experimental measurements suggest the possibility of a breakdown of lepton () universality in exclusive semileptonic meson decays. We…
Constituent Counting Rules and Exotic Hadrons
Richard F. Lebed
The constituent counting rules, i.e., the scaling behavior of amplitudes (in terms of the number of fundamental constituents) for exclusive processes when high energy scales are pr…
Model-Independent Bounds on
Thomas D. Cohen, Henry Lamm, Richard F. Lebed
We present a model-independent bound on . This bound is constructe…
QCD Constituent Counting Rules for Neutral Vector Mesons
Stanley J. Brodsky, Richard F. Lebed, Valery E. Lyubovitskij
QCD constituent counting rules define the scaling behavior of exclusive hadronic scattering and electromagnetic scattering amplitudes at high momentum transfer in terms of the tota…
Spectroscopy of Exotic Hadrons Formed from Dynamical Diquarks
Richard F. Lebed
The dynamical diquark picture asserts that exotic hadrons can be formed from widely separated colored diquark or triquark components. We use the Born-Oppenheimer (BO) approximation…
Heavy-Quark Hybrid Mass Splittings: Hyperfine and "Ultrafine"
Richard F. Lebed, Eric S. Swanson
It is argued that the heavy-quark limit of QCD requires a certain combination of hyperfine mass splittings in heavy-quark hybrid-meson multiplets to be unusually small. This observ…
Quarkonium States As Arbiters of Exoticity
Richard F. Lebed, Eric S. Swanson
The mass splitting between the quarkonium spin-singlet state () and the spin average of the quarkonium spin-triplet states ($J^{PC} = 0^{++}, 1^{++}, 2^{++…