Tue·Dec 31, 2019Tuesday·December 31, 2019

1. 01*

   Hadron properties in a nuclear medium and effective nuclear force from quarks: the quark-meson coupling model

   K. Tsushima🇧🇷

   We give a short review of the quark-meson coupling (QMC) model, the quark-based model of finite nuclei and hadron interactions in a nuclear medium, highlighting on the relationship with the Skyrme effective nuclear forces. The model is based on a mean field description of nonoverlapping nucleon MIT bags bound by the self-consistent exchange of Lorentz-scalar-isoscalar, Lorentz-vector-isoscalar, and Lorentz-vector-isovector meson fields directly coupled to the light quarks up and down. In conventional nuclear physics the Skyrme effective forces are very popular, but, there is no satisfactory interpretation of the parameters appearing in the Skyrme forces. Comparing a many-body Hamiltonian generated by the QMC model in the zero-range limit with that of the Skyrme force, it is possible to obtain a remarkable agreement between the Skyrme force and the QMC effective interaction. Furthermore, it is shown that 3-body and higher order N-body forces are naturally included in the QMC-generated effective interaction.

   ↳ nucl-thhep-exhep-phnucl-exAAPPS (Association of Asia Pacific Physic…·3 citations
2. 02*

   Spectrum of the strange hidden charm molecular pentaquarks in chiral effective field theory

   Bo Wang🇨🇳 · Lu Meng🇨🇳 · Shi-Lin Zhu🇨🇳

   We calculate the effective potentials of the ${\Xi }_c{\bar{D}}^{(\ast )}$, ${\Xi }_c^{\prime }{\bar{D}}^{(\ast )}$ and ${\Xi }_c^{\ast }{\bar{D}}^{(\ast )}$ systems with the chiral effective field theory up to the next-to-leading order. We simultaneously consider the short-, intermediate- and long-range interactions. With the newly observed $P_c$ spectra as inputs, we construct the quark-level contact Lagrangians to relate the low energy constants to those of ${\Sigma }_c{\bar{D}}^{(\ast )}$ with the help of quark model. Our calculation indicates there are seven bound states in the $I=0$ strange hidden charm $[{\Xi }_c^{\prime }{\bar{D}}^{(\ast )}{]}_J(J=\frac{1}{2},\frac{3}{2})$ and $[{\Xi }_c^{\ast }{\bar{D}}^{(\ast )}{]}_J(J=\frac{1}{2},\frac{3}{2},\frac{5}{2})$ systems. Our analyses also disfavor the ${\Lambda }_c{\bar{D}}^{(\ast )}$ bound states. However, we obtain three new hadronic molecules in the isoscalar $[{\Xi }_c{\bar{D}}^{(\ast )}{]}_J(J=\frac{1}{2},\frac{3}{2})$ systems. The masses of $[{\Xi }_c\bar{D}{]}_{1/2}$, $[{\Xi }_c{\bar{D}}^{\ast }{]}_{1/2}$ and $[{\Xi }_c{\bar{D}}^{\ast }{]}_{3/2}$ are predicted to be $4319.4_{-3.0}^{+2.8}$ MeV, $4456.9_{-3.3}^{+3.2}$ MeV and $4463.0_{-3.0}^{+2.8}$ MeV, respectively. We also notice the one-eta-exchange influence is rather feeble. Binding solutions in the $I=1$ channels are nonexistent. We hope the future analyses at LHCb can seek for these new $P_{cs}$s in the $J\psi \Lambda$ final states, especially near the thresholds of ${\Xi }_c{\bar{D}}^{(\ast )}$.

   ↳ hep-phhep-exhep-latnucl-ex+1PRD(2020)·127 citations
3. 03*

   The multilayer structure of protons

   I.M. Dremin🇷🇺

   It is argued that the dynamics of the elastic scattering of high-energy protons at intermediate transferred momenta changes with the energy increase. It evolves from the multiple scattering at the external layer for energies about 10 GeV to the double scattering at the two subsequent layers within the colliding protons for energies about 10 TeV. The problem of the unitarity is considered in this context.

   ↳ hep-phhep-exnucl-exnucl-thEPJC(2020)·10 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.