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Nuclear Theory·nucl-th

Monday·May 9, 2022

7 papers—3 primary·4 cross-listed

All7Primary3Cross-lists4
  1. 04

    Strongly Bound Dibaryon with Maximal Beauty Flavor from Lattice QCD

    Nilmani Mathur🇮🇳 · M. Padmanath🇩🇪 · Debsubhra Chakraborty🇮🇳

    We report the first lattice QCD study of the heavy dibaryons in which all six quarks have the bottom (beauty) flavor. Performing a state-of-the-art lattice QCD calculation we find clear evidence for a deeply bound - dibaryon in the channel, as a pole singularity in the -wave - scattering amplitude with a binding energy MeV. With such a deep binding, Coulomb repulsion serves only as a perturbation on the ground state wave function of the parameterized strong potential and may shift the strong binding only by a few percent. Considering the scalar channel to be the most bound for single flavored dibaryons, we conclude this state is the heaviest possible most deeply bound dibaryon in the visible universe.

    ↳ hep-lathep-exhep-phnucl-thPRL(2023)·54 citations
  2. 05

    J-PARC hadron physics and future possibilities on color transparency

    S. Kumano🇯🇵

    The J-PARC is a hadron-accelerator facility to provide secondary beams of kaons, pions, neutrinos, muons, and the others together with the primary proton beam for investigating a wide range of science projects. High-energy hadron physics can be studied by using high-momentum beams of unseparated hadrons, which are essentially pions, and also primary protons. In this report, possible experiments are explained on color transparency and generalized parton distributions (GPDs). These projects are complementary to lepton-scattering experiments at JLab, COMPASS/AMBER, and future electron-ion colliders. Because of hadron-beam energies up to 30 GeV, the J-PARC is a unique facility to investigate the transition region from the hadron degrees of freedom to the quark-gluon one. It is suitable for finding mechanisms of the color transparency. Such color-transparency studies are also valuable for clarifying factorization of hadron-production processes in extracting the GPDs from actual measurements. These studies will lead to the understanding of basic high-energy hadron interactions in nuclear medium and to clarifications on the origins of hadron spins, masses, and internal pressure mechanisms.

    ↳ hep-phhep-exhep-latnucl-ex+1MDPI Physics(2022)·9 citations
  3. 06

    Wave Phenomena In General Relativistic Magnetohydrodynamics

    Ankit Kumar Panda🇮🇳 · Victor Roy🇮🇳

    Here we study the wave propagation and stability of general relativistic non-resistive dissipative second-order magnetohydrodynamic equations in curved space-time. We solve the Boltzmann equation for a system of particles and antiparticles using the relaxation time approximation and the Chapman-Enskog-like gradient expansion for the off-equilibrium distribution function, truncating beyond second-order in curved space-time in electromagnetic fields. Unlike holographic calculation~\cite{Baier:2007ix}, we show that the viscous evolution equations do not explicitly depend on the curvature of space-time. Also, we have tested the causality and stability of the second-order theory in curved space-time in the presence of linearised metric perturbation and derived dispersion relations for various modes. Interestingly, we found the coupling of gravitational modes with the usual magneto-sonic modes in the small wave-number limit. Also, we show additional non-hydrodynamical modes arise due to gravity for a bulk-viscous fluid.

    ↳ gr-qcnucl-thphysics.flu-dyn3 citations
  4. 07

    Conductivity, diffusivity, and violation of Wiedemann-Franz Law in a hadron resonance gas with van der Waals interactions

    Kshitish Kumar Pradhan🇮🇳 · Dushmanta Sahu🇮🇳 · Ronald Scaria🇮🇳 · Raghunath Sahoo🇮🇳

    In this work, a hadron resonance gas under van der Waals (VDW) interactions has been studied. Both attractive and repulsive interactions between the meson-meson and (anti)baryon-(anti)baryon have been taken into consideration. Various transport properties such as electrical conductivity () and thermal conductivity () have been estimated by solving the Boltzmann transport equation under the relaxation time approximation. The effect of baryochemical potential () and temperature is also explicitly explored for the mentioned observables. Comparisons have been made with the results obtained from other existing theoretical models. We observe the violation of Wiedemann-Franz law in a hadron resonance gas at a high-temperature regime. The corresponding diffusivities have also been estimated, which can help us to understand the system in a better way.

    ↳ hep-phhep-exnucl-exnucl-thPRC(2023)·32 citations

Affiliations

first authorsco-authorsvia INSPIRE