Nuclear Theory·nucl-th

Thursday·May 30, 2024

7 papers—3 primary·4 cross-listed

04
Radiative corrections to superallowed $β$ decays in effective field theory
Vincenzo Cirigliano🇺🇸 · Wouter Dekens🇺🇸 · Jordy de Vries🇳🇱 · Stefano Gandolfi🇺🇸 · Martin Hoferichter🇨🇭 · Emanuele Mereghetti🇺🇸
The accuracy of $V_{u d}$ determinations from superallowed $β$ decays critically hinges on control over radiative corrections. Recently, substantial progress has been made on the single-nucleon, universal corrections, while nucleus-dependent effects, typically parameterized by a quantity $δ_{NS}$ , are much less well constrained. Here, we lay out a program to evaluate this correction from effective field theory (EFT), highlighting the dominant terms as predicted by the EFT power counting. Moreover, we compare the results to a dispersive representation of $δ_{NS}$ and show that the expected momentum scaling applies even in the case of low-lying intermediate states. Our EFT framework paves the way towards ab-initio calculations of $δ_{NS}$ and thereby addresses the dominant uncertainty in $V_{u d}$ .
↳ hep-phhep-exhep-latnucl-ex+1PRL(2024)·42 citations
05
Towards the understanding of heavy quarks hadronization: from leptonic to heavy-ion collisions
J. Altmann🇦🇺 · A. Dubla🇩🇪 · V. Greco🇮🇹 · A. Rossi🇮🇹 · P. Skands🇦🇺
The formation of hadrons is a fundamental process in nature that can be investigated at particle colliders. As several recent findings demonstrate, with $e^{+} e^{-}$ collisions as a "vacuum-like" reference at one extreme, and central nucleus--nucleus as a dense, extended-size system characterized by flow and local equilibrium at the opposite extreme, different collision systems offer a lever arm that can be exploited to probe with a range of heavy-flavour hadron species the onset of various hadronization processes. In this review, we present an overview of the theoretical and experimental developments. The focus is on open-heavy-flavour measurements. The comparison with model predictions and connections among the results in electron-positron, proton--proton, proton--nucleus, nucleus--nucleus collisions are discussed. After reviewing the current state, we suggest some prospects and future developments.
↳ hep-phnucl-exnucl-thEPJC(2025)·38 citations
06
Measuring differential particle correlations in relativistic nuclear collisions
Niseem Magdy🇺🇸
This study explores the transverse momentum ( $p_{T}$ ) dependencies of Symmetric and Asymmetric Correlations (SC and ASC) with one and two particles of interest in Au+Au collisions at 200 GeV. Leveraging the AMPT model, the investigation delves into the sensitivity of these correlations to the final state effects, providing valuable insights into their potential for constraining the final state effects' $p_{T}$ dependencies. The HIJING model is employed as a benchmark for non-flow correlations, shedding light on their impact on interpreting SC and ASC data. Moreover, the study points out that differential SC and ASC with one and two particles of interest (POIs) typically incorporate contributions from event-plane angle fluctuations. Consequently, this work highlights the significance of SC and ASC with one and two POIs as valuable tools for investigating the $p_{T}$ nature of the final state effects and advocates for comprehensive experimental measurements across various beam energies and system sizes to enhance our understanding and provide additional constraints for theoretical models.
↳ hep-phnucl-exnucl-thPRC(2024)·2 citations
07
Dark matter admixed neutron stars with a realistic nuclear equation of state from chiral nuclear interactions
Domenico Scordino🇮🇹 · Ignazio Bombaci🇮🇹
We study the effects of dark matter on the structural properties of neutron stars. In particular we investigate how the presence of a dark matter component influences the mass-radius relation, the value of the maximum mass of a neutron star and other stellar properties. To model ordinary matter we use a state-of-the-art equation of state of $β$ -stable nuclear matter obtained using the Brueckner-Hartree-Fock quantum many-body approach starting from two-body and three-body nuclear interactions derived from chiral effective field theory. The dark matter component of the star is modeled as a non-self-annihilating system of spin $1/2$ fermions at zero temperature and its equation of state as an ideal relativistic Fermi gas. The equilibrium configurations of these dark matter admixed neutron stars (DANS) are calculated by solving a generalization of the Tolman-Oppenheimer-Volkoff equations to the case where the system consists of two perfect fluids interacting solely through gravity. We find that, depending on the dark matter particle mass $m_{χ}$ , one can have somehow opposite effects on the stellar properties. In the case $m_{χ} = 1 GeV$ , the stellar gravitational maximum mass $M_{ma x}$ decreases, whereas in the case $m_{χ} = 0.1 GeV$ , $M_{ma x}$ increases with respect to the maximum mass of ordinary neutron stars. We also show that the presence of dark matter has indirect sizable effect on the proton fraction in the ordinary matter fluid and, in the case $m_{χ} = 1 GeV$ , results in a decrease of the threshold gravitational mass $M_{t o t}^{d u r c a}$ for having direct URCA processes and fast stellar cooling. Finally we study the stability of dark matter admixed neutron stars with respect to radial perturbations.
↳ astro-ph.HEgr-qcnucl-thJHEAp(2025)·17 citations

Affiliations

first authorsco-authorsvia INSPIRE

Radiative corrections to superallowed β decays in effective field theory

Towards the understanding of heavy quarks hadronization: from leptonic to heavy-ion collisions

Measuring differential particle correlations in relativistic nuclear collisions

Dark matter admixed neutron stars with a realistic nuclear equation of state from chiral nuclear interactions

Affiliations

Radiative corrections to superallowed $β$ decays in effective field theory