Mon·Aug 8, 2022Monday·August 8, 2022

1. 01*

   Electroweak nuclear radii constrain the isospin breaking correction to $V_{ud}$

   Chien-Yeah Seng🇩🇪 · Mikhail Gorchtein🇩🇪

   We lay out a novel formalism to connect the isospin-symmetry breaking correction to the rates of superallowed nuclear beta decays, ${\delta }_{\text{C}}$, to the isospin-breaking sensitive combinations of electroweak nuclear radii that can be accessed experimentally. We individuate transitions in the superallowed decay chart where a measurement of the neutron skin of a stable daughter even at a moderate precision could already help discriminating between models used to compute ${\delta }_{\text{C}}$. We review the existing experimental situation and make connection to the existing and future experimental programs.

   ↳ nucl-thhep-exhep-phnucl-exPLB(2023)·35 citations
2. 02*

   Fully-heavy hexaquarks in a constituent quark model

   Qi-Fang Lü🇨🇳 · Dian-Yong Chen🇨🇳 · Yu-Bing Dong🇨🇳

   In this work, we systematically investigate the mass spectra of fully-heavy hexaquarks within a constituent quark model by including the color Coulomb potential, linear confining potential, and spin-spin interactions. Our results show that all of the fully-heavy hexaquarks lie above the corresponding baryon-baryon thresholds, and thus no stable compact one exists. These states may subsist as resonances and decay into two fully-heavy baryons easily through the fall-apart mechanism, which can be searched in future experiments.

   ↳ hep-phhep-exnucl-ex15 citations
3. 03*

   The reaction $\pi N\to \omega N$ in a dynamical coupled-channel approach

   Yu-Fei Wang🇩🇪 · Deborah Rönchen🇩🇪 · Ulf-G. Meißner🇩🇪 · Yu Lu🇨🇳 · Chao-Wei Shen🇩🇪 · Jia-Jun Wu🇨🇳

   A refined investigation on light flavor meson-baryon scatterings is performed using a dynamical coupled-channel approach, the Jülich-Bonn model, that respects unitartiy and analyticity constraints. The channel space of $\pi N$, $\pi \Delta$, $\sigma N$, $\rho N$, $\eta N$, $K\Lambda$ and $K\Sigma$ is extended by adding the $\omega N$ final state. The spectra of $N^{\ast }$ and $\Delta$ resonances are extracted in terms of complex poles of the scattering amplitudes, based on the result of a global fit to a worldwide collection of data, in the energy region from the $\pi N$ threshold to center-of-mass energy $z=2.3$ GeV. A negative value of the $\omega N$ elastic spin-averaged scattering length is extracted, questioning the existence of bound states of the $\omega$ meson in the nuclear matter.

   ↳ nucl-thhep-phnucl-exphysics.comp-phPRD(2022)·20 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.