Nuclear Theory·nucl-th

Wednesday·February 2, 2022

12 papers—8 primary·4 cross-listed

09
Hadronic structure on the light-front IV: Heavy and light Baryons
Edward Shuryak🇺🇸 · Ismail Zahed🇺🇸
This work is a continuation in our series of papers, that addresses quark models of hadronic structure on the light front. The chief focus of this paper is the quantum-mechanical solution of the three-quark model Hamiltonian, describing baryons. In Jacobi coordinates, we use a harmonic oscillator basis for the transverse directions. For the longitudinal momentum fractions $x_{i}$ , the pertinent basis follows from quantum mechanics in a "triangular cup" potential, which we solve exactly. We calculate the masses and light front wave functions for the flavor symmetric $\frac{3}{2}^{+}$ baryons $bbb, ccc, sss, uuu$ .
↳ hep-phhep-latnucl-thPRD(2023)·21 citations
10
Generalized parton distributions of sea quarks in the proton from nonlocal chiral effective theory
Fangcheng He🇨🇳 · Chueng-Ryong Ji🇺🇸 · W. Melnitchouk🇺🇸 · A. W. Thomas🇦🇺 · P. Wang🇨🇳
We calculate the spin-averaged generalized parton distributions (GPDs) of sea quarks in the proton at zero skewness from nonlocal covariant chiral effective theory, including one-loop contributions from intermediate states with pseudoscalar mesons and octet and decuplet baryons. A relativistic regulator is generated from the nonlocal Lagrangian where a gauge link is introduced to guarantee local gauge invariance, with additional diagrams from the expansion of the gauge link ensuring conservation of electric charge and strangeness. Flavor asymmetries for sea quarks at zero and finite momentum transfer, as well as strange form factors, are obtained from the calculated GPDs, and results compared with phenomenological extractions and lattice QCD.
↳ hep-phhep-exnucl-thPRD(2022)·19 citations
11
Pion axioproduction: The Delta resonance contribution
Thomas Vonk🇩🇪 · Feng-Kun Guo🇨🇳 · Ulf-G. Meißner🇩🇪
The process of pion axioproduction, $a N \to π N$ , with an intermediate $Δ$ resonance is analyzed using baryon chiral parturbation theory. The $Δ$ resonance is included in two ways: First, deriving the $a Δ N$ -vertices, the axion is brought into contact with the resonance, and, second, taking the results of $π N$ elastic scattering including the $Δ$ , it is implicitly included in the form of a pion rescattering diagram. As a result, the partial wave cross section of axion-nucleon scattering shows an enhancement in the energy region around the $Δ$ resonance. Because of the isospin breaking, the enhancement is not as pronounced as previously anticipated. However, since the isospin breaking here is much milder than that for usual hadronic processes, novel axion search experiments might still exploit this effect.
↳ hep-phhep-exnucl-exnucl-thPRD(2022)·15 citations
12
Transverse Polarization of Hyperons Produced in Semi-Inclusive Deep Inelastic Scattering
Yuji Koike🇯🇵 · Kazuki Takada🇯🇵 · Sumire Usui🇯🇵 · Kenta Yabe🇯🇵 · Shinsuke Yoshida🇨🇳
We study the transverse polarization of hyperons produced in semi-inclusive deep inelastic scattering, $e p \to e Λ^{↑} X$ , in the framework of the collinear twist-3 factorization. The cross section from the twist-3 distribution functions and the twist-3 quark fragmentation functions is computed in the leading order with respect to the QCD coupling constant. The constraint relations among the twist-3 FFs are taken into account to simplify the formula. The formula is relevant to large- $P_{T}$ hyperon production in the future Electron-Ion-Collider experiment.
↳ hep-phnucl-thPRD(2022)·11 citations

Affiliations

first authorsco-authorsvia INSPIRE

Hadronic structure on the light-front IV: Heavy and light Baryons

Generalized parton distributions of sea quarks in the proton from nonlocal chiral effective theory

Pion axioproduction: The Delta resonance contribution

Transverse Polarization of Hyperons Produced in Semi-Inclusive Deep Inelastic Scattering

Affiliations