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Nuclear Theory·nucl-th

Monday·November 4, 2024

7 papers—3 primary·4 cross-listed

All7Primary3Cross-lists4
  1. 01

    A New Class of Three Nucleon Forces and their Implications

    V. Cirigliano🇺🇸 · M. Dawid🇺🇸 · W. Dekens🇺🇸 · S. Reddy🇺🇸

    We identify a new class of three-nucleon forces that arises in the low-energy effective theory of nuclear interactions including pions. We estimate their contribution to the energy of neutron and nuclear matter and find that it can be as important as the leading-order three-nucleon forces previously considered in the literature. The magnitude of this force is set by the strength of the coupling of pions to two nucleons and is presently not well constrained by experiments. The implications for nuclei, nuclear matter, and the equation of state of neutron matter are briefly discussed.

    nucl-thastro-ph.HEhep-lathep-phPRL(2025)·16 citations
  2. 02

    Scale-(in)dependence in quantum 4-body scattering

    Sourav Mondal · Rakshanda Goswami · Udit Raha · Johannes Kirscher

    We investigate the multi-channel 4-body scattering system using regularized 2- and 3-body contact interactions. The analysis determines the sensitivity of bound-state energies, scattering phase shifts and cross sections on the cutoff parameter (), and the energy gaps between scattering thresholds. The latter dependency is obtained with a 2-body scale fixed to an unnaturally large value and a floating 3-body parameter. Specifically, we calculate the binding energies of the shallow 3- and 4-body states, dimer-dimer and trimer-atom scattering lengths, and the trimer-atom to dimer-dimer reaction rates. Employing a potential renormalized by a large 2-body scattering length and a 3-body scale, we find all calculated observables to remain practically constant over the range . Divergences in scattering lengths emerge for critical 3-body parameters at which thresholds are degenerate. Such threshold effects are found to be independent of the regulator cutoff. Furthermore, at those critical points where the dimer-dimer and trimer-atom thresholds overlap, we predict an enhancement of the inelastic over the elastic scattering event. Such an inversion between elastic- and rearrangement-collision probabilities indicates a strong sensitivity of the 4-body reaction dynamics on the 3-body parameter at finite 2-body scale. This phenomenon is absent in earlier studies which differ in the renormalization scheme. As this discrepancy arises for all considered cutoffs, a more comprehensive parametrization of short-distance structure is necessary: sole cutoff variation does not reveal non-perturbative change in reaction rates conjectured to be due to a combined effect of the finite 2-body range and the specific choice for the 3-body parameter.

    nucl-thcond-mat.quant-gasphysics.atom-phEPJA(2025)·1 citation
  3. 03

    Unlocking "imprints" of conserved charges in the initial state of heavy-ion collisions

    Fernando G. Gardim · Dekrayat Almaalol · Jordi Salinas San Martín · Christopher Plumberg · Jacquelyn Noronha-Hostler

    Hydrodynamic approaches to modeling relativistic high-energy heavy-ion collisions are based on the conservation of energy and momentum. However, the medium formed in these collisions also carries additional conserved quantities, including baryon number (B), strangeness (S), and electric charge (Q). In this Letter, we propose a new set of anisotropic flow observables designed to be exclusively sensitive to the effects of conserved BSQ charge fluctuations, providing insight into the initial state. Using the recently developed hydrodynamic framework \iccing{}+\ccake{}, we show that these new observables provide a measurable effect of initial BSQ charge fluctuations (ranging up to 10\%), which can be tested by experiments.

    nucl-thhep-phnucl-ex4 citations

Affiliations

first authorsco-authorsvia INSPIRE