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Nuclear Theory·nucl-th

Friday·December 15, 2023

15 papers—6 primary·9 cross-listed

All15Primary6Cross-lists9
  1. 01

    Pseudo-neutrino versus recoil formalism for 4-body phase space and applications to nuclear decay

    Chien-Yeah Seng🇺🇸

    It is well-known that the traditional treatment of radiative corrections that utilizes the "true" neutrino momentum in the differential decay rate formula could lead to a systematic error in certain observables due to the mistreatment of 4-body kinematics. We investigate the theory structure of one of the proposed solutions, the "-formalism", in the non-recoil limit appropriate for neutron and nuclear beta decays. We derive an elegant master formula for the 4-body phase space and use it to re-analyze the spectrum-dependent "outer" radiative corrections to the beta decay of a polarized spin-half nucleus; a complete set of analytic expressions is provided for readers to straightforwardly obtain the final numerical results. We compare it to the "recoil formalism" where the energy of the recoil nucleus is fixed.

    nucl-thhep-exhep-phnucl-exPRC(2024)·8 citations
  2. 02

    Direct solution of Minkowski-space Bethe-Salpeter equation in the massive Wick-Cutkosky model

    Shaoyang Jia🇺🇸

    In order to solve the Bethe-Salpeter equation (BSE) in the Minkowski space, we first introduce the Nakanishi integral representations of the Bethe-Salpeter amplitude (BSA) and the Bethe-Salpeter wave function (BSWF). We then derive the explicit integral equations for the corresponding spectral functions from the BSE for states of scalar particles bound by a scalar-particle exchange interaction, where the propagators of constituents are allowed to be fully dressed. These integral equations are subsequently solved numerically in the variation of the Wick-Cutkosky model with massive exchange particles, where an algorithm of adaptive mash grid is proposed. The equations and algorithm we develop here serve as the foundation of Minkowski-space formulation of BSE for bound states of fermions.

    nucl-thhep-thPRD(2024)·4 citations
  3. 03

    Effects of phase transition in hybrid stars from quark-meson coupling hadronic matter to deconfined quark matter

    Yida Yang🇨🇳 · Chen Wu🇨🇳 · Ji-Feng Yang🇨🇳

    Different types of phase transition from hadron to quark at high density near zero temperature may occur in the inner core of hybrid stars. We investigate the impacts of phase transition types and quark models on properties of hybrid star and quark cores. The quark-meson coupling (QMC) model is used to describe hadronic matter, and the MIT bag model as well as the Nambu-Jona-Lasinio (NJL) model are employed to describe quark matter for comparison. From the mass-radius curves obtained by using equations of state (EOS), we find that EOSs of hadron matter have a decisive influence on the maximum mass of a hybrid star in the first-order phase transition case, while quark matter EOSs have more impacts on results in the crossover transition case. It is also found in the present work that the thermodynamic correction arising from an interpolation scheme considerably stiffens the EOSs. Therefore the crossover type phase transition generally leads to hybrid stars with higher masses. In particular, by using the QMC model and the NJL model to construct crossover EOSs with thermodynamic correction, we discover that the maximum masses of hybrid stars can meet the recent observational constraint on mass from PSR J0952-0607, i.e., .

    nucl-thPRD(2024)·5 citations
  4. 04

    Fate of the - mixing in dilepton production

    Azumi Sakai🇯🇵 · Masayasu Harada🇯🇵 · Chiho Nonaka🇯🇵 · Chihiro Sasaki🇵🇱 · Kenta Shigaki🇯🇵 · Satoshi Yano🇯🇵

    We investigate the effect of chiral mixing on dilepton production by combining the in-medium spectral function in the chiral effective field theory with the state-of-the-art fluid dynamical simulations. We compare the spectral functions with different chiral symmetry restoration scenarios. We find that the scenario with proper chiral symmetry restoration that takes into account the degenerate and mesons leads to an increase of the yield in the window of GeV. Whereas, the low-temperature theorem of chiral mixing extrapolated toward a chiral crossover, often used in the literature, leads to a substantial overestimate at GeV.

    nucl-thhep-phnucl-exEPJ Web Conf.(2024)·3 citations
  5. 05

    Global and local polarization of hyperons across RHIC-BES energies

    Xiang-Yu Wu🇨🇳 · Cong Yi🇨🇳 · Guang-You Qin🇨🇳 · Shi Pu🇨🇳

    We report our recent study on the global and local polarization of hyperons in Au+Au collisions at RHIC-BES energies within the (3+1)-dimensional CLVisc hydrodynamics framework. We present our numerical results for the global polarization as the function of collision energies and the local polarization along the beam direction as functions of azimuthal angle in % centrality at =7.7 GeV Au+Au collision energy. We have discussed the effects of initial conditions, Spin Hall effect and baryon diffusion.

    nucl-thhep-exhep-phnucl-exEPJ Web Conf.(2024)·3 citations
  6. 06

    Exploring the freeze-out hypersurface of relativistic nuclear collisions with a rapidity-dependent thermal model

    Han Gao🇨🇦 · Lipei Du🇨🇦 · Sangyong Jeon🇨🇦 · Charles Gale🇨🇦

    Considering applications to relativistic heavy-ion collisions, we develop a rapidity-dependent thermal model that includes thermal smearing effect and longitudinal boost. We calibrate the model with thermal yields obtained from a multistage hydrodynamic simulation. Through Bayesian analysis, we find that our model extracts freeze-out thermodynamics with better precision than rapidity-independent models. The potential of such a model to constrain longitudinal flow from data is also demonstrated.

    nucl-thhep-phnucl-exEPJ Web Conf.(2024)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE