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Nuclear Theory·nucl-th

Wednesday·June 4, 2025

12 papers—7 primary·5 cross-listed

All12Primary7Cross-lists5
  1. 08

    Investigating the inclusive photoproduction in ultraperipheral collisions at the Large Hadron Collider

    Victor P. Goncalves🇧🇷 · Luana Santana🇧🇷 · Wolfgang Schäfer🇵🇱

    The inclusive photoproduction in collisions at the center - of - mass energies of the Large Hadron Collider (LHC) is investigated considering the color dipole - matrix approach. The analytical expressions for the differential distributions are derived in the impact parameter and transverse momentum spaces and predictions for the rapidity and transverse momentum distributions are presented considering three distinct models for the unintegrated gluon distribution of the nuclear target. In particular, we compare the predictions derived assuming a linear dynamics, with and without the inclusion of nuclear effects, with those obtained by solving the running coupling Balitsky - Kovchegov equation. A comparison of these predictions with the recent (preliminary) CMS data is also performed. Our results indicate that a detailed analysis of this observable will be very useful to improve our understanding of the strong interaction theory at high energies and in a nuclear medium.

    ↳ hep-phhep-exnucl-exnucl-thPLB(2025)·6 citations
  2. 09

    Euclidean-Monte-Carlo-informed ground-state preparation for quantum simulation of scalar field theory

    Navya Gupta🇺🇸 · Christopher David White🇺🇸 · Zohreh Davoudi🇺🇸

    Quantum simulators offer great potential for investigating dynamical properties of quantum field theories. However, preparing accurate non-trivial initial states for these simulations is challenging. Classical Euclidean-time Monte-Carlo methods provide a wealth of information about states of interest to quantum simulations. Thus, it is desirable to facilitate state preparation on quantum simulators using this information. To this end, we present a fully classical pipeline for generating efficient quantum circuits for preparing the ground state of an interacting scalar field theory in 1+1 dimensions. The first element of this pipeline is a variational ansatz family based on the stellar hierarchy for bosonic quantum systems. The second element of this pipeline is the classical moment-optimization procedure that augments the standard variational energy minimization by penalizing deviations in selected sets of ground-state correlation functions (i.e., moments). The values of ground-state moments are sourced from classical Euclidean methods. The resulting states yield comparable ground-state energy estimates but exhibit distinct correlations and local non-Gaussianity. The third element of this pipeline is translating the moment-optimized ansatz into an efficient quantum circuit with an asymptotic cost that is polynomial in system size. This work opens the way to systematically applying classically obtained knowledge of states to prepare accurate initial states in quantum field theories of interest in nature.

    ↳ quant-phhep-lathep-phnucl-thPRD(2026)·10 citations
  3. 10

    The Non-perturbative term for the Vector Form Factor of Pion Decay

    Susumu Kinpara🇯🇵

    The vector form factor of the decay is calculated by the method for the pseudovector pion-nucleon system. The non-perturbative term is taken into account by using the parameter for the self-energy of nucleon following our previous calculation of the pion form factor. The suppression of the anomalous interaction of proton in the loop integral is significant to understand the experimental value.

    ↳ hep-phnucl-th1 citation
  4. 11

    The Study of Pole Trajectory within a bare state in the coupled channel model

    Wei Hao🇨🇳 · Jia-Jun Wu🇨🇳 · Jin-Lin Fu🇨🇳

    We investigate two-particle scattering and two-particle scattering with a bare basis state using Hamiltonian Effective Field Theory (HEFT). We analyze the distribution of two-body scattering poles in the momentum and energy planes under relativistic conditions. Compared to the non-relativistic case, there are significant differences in the distribution of bound state poles and resonance poles in the relativistic case, primarily due to the square root term in the relativistic formula. By considering pure two-particle scattering, we examine the relationship between the form factor and the number of poles. Additionally, we clearly elucidate the effects of attractive and repulsive interactions on the bound state poles and resonance poles. More importantly, we extend our model by including a bare state and explore the poles originating from the bare state or coupled channels through the trajectories of pole positions, as well as the compositeness of bound states.

    ↳ hep-phnucl-thPRD(2025)·1 citation
  5. 12

    Renormalization of the three-flavor quark-meson diquark model

    Jens O. Andersen🇳🇴 · Mathias P. Nødtvedt🇳🇴

    We discuss the properties of the two- and three-flavor quark-meson diquark (QMD) model as a renormalizable low-energy effective model for color superconductivity in dense QCD. The effective degrees of freedom are scalars, pseudo-scalars, diquarks, and quarks. The parameters in the scalar/pseudo-scalar sector can be determined by matching the meson pole masses and decay constants to their observed values using the on-shell renormalization scheme. The remaining parameters are in the diquark sector and a priori unknown. In principle, they can be calculated from QCD, but we consider them free. We renormalize the thermodynamic potential in the 2SC phase for two flavors and in the color-flavor-locked (CFL) phase for three flavors, determining the counterterms of the couplings in the diquark sector. We derive a set of renormalization group equations for these couplings that are used to improve the thermodynamic potential. As an application, we calculate the gap and the speed of sound in the ideal CFL phase. It is shown that the gap approaches a constant as and that the speed of sound relaxes to the conformal limit from above.

    ↳ hep-phnucl-th7 citations

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first authorsco-authorsvia INSPIRE