Mon·Mar 24, 2025Monday·March 24, 2025

1. 01*

   Virtual Majorana Neutrinos and the Minimum Neutrino Mass Scale in Neutrinoless Double-Beta Decay

   Dongming Mei🇺🇸 · Kunming Dong🇺🇸 · Austin Warren🇺🇸 · Sanjay Bhattarai🇺🇸

   Virtual Majorana neutrinos are indispensable for neutrinoless double-beta (0$\nu \beta \beta$) decay. In this study, we demonstrate that the overlap of the virtual Majorana neutrino wavefunction, predominantly composed of a right-handed antineutrino component with a strongly suppressed left-handed component (with amplitude proportional to the effective Majorana neutrino mass, $|m_{\beta \beta }|$, is crucial for triggering this decay process. This effective mass, derived from the minimum neutrino mass, offers valuable insights into the absolute neutrino mass scale. Using best-fit parameters from neutrino oscillation experiments, the minimum neutrino mass is determined from the sum of the three neutrino mass eigenstates, $\Sigma =m_1+m_2+m_3,$ which is represented by two narrow bands centered at approximately 0.06 eV/c${}^2$ for the normal hierarchy (NH) and 0.102 eV/c${}^2$ for the inverted hierarchy (IH). Under these constraints, the minimum neutrino mass is found to be 0.001186 eV/c${}^2$ for NH and 0.002646 eV/c${}^2$ for IH, thereby establishing a potential absolute neutrino mass scale for both scenarios. From these values, we calculate $|m_{\beta \beta }|$, which plays a central role in $0\nu \beta \beta$ decay. By combining $|m_{\beta \beta }|$ with decay phase-space factors, nuclear matrix elements, and the absorption probability of the virtual Majorana neutrino, we estimate the $0\nu \beta \beta$ half-life for key isotopes, namely, ${}^{76}$Ge, ${}^{130}$Te, and ${}^{136}$Xe, using two independent methods. The results are in good agreement, and we also discuss the uncertainties in the nuclear matrix elements that may affect these calculations.

   ↳ hep-phnucl-exnucl-th0 citations
2. 02*

   Glueballonia as Hopfions

   Yuki Amari🇯🇵 · Muneto Nitta🇯🇵 · Chihiro Sasaki🇵🇱 · Kenta Shigaki🇯🇵 · Satoshi Yano🇯🇵 · Shigehiro Yasui🇯🇵

   We work out the Hopfion description of glueballs by inclusively comparing the energy spectra obtained by quantizing Hopfions with experimental data and lattice QCD. Identifying a Hopfion carrying a unit topological charge as $f_0(1500)$, the Hopfions with the topological charge two are classified as glueballonia, i.e., two glueballs are bound together. We find a tightly and a loosely bound glueballonia complying with $f_0(2470)$ and a novel scalar particle carrying the mass around 2814 MeV, respectively, and calculate their binding energies. By the rigid body quantization of Hopfions, we predict a characteristic multiplet structure of tensor glueball states. Some of them are missing in the current experimental data and can be verified in future measurements.

   ↳ hep-phnucl-exnucl-thPLB(2025)·3 citations
3. 03*

   Bayesian reconstruction of anisotropic flow fluctuations at fixed impact parameter

   Enak Roubertie🇫🇷 · Mathis Verdan🇫🇷 · Andreas Kirchner🇺🇸 · Jean-Yves Ollitrault🇫🇷

   The cumulants of the distribution of anisotropic flow are measured accurately in Pb+Pb collisions at the LHC as a function of centrality classifiers (charged multiplicity and/or transverse energy). Using Bayesian inference, we reconstruct from these measurements the probability distribution of anisotropic flow in the ``theorists' frame'' where the impact parameter has a fixed magnitude and orientation, up to $\sim 70\%$ centrality. The variation of flow fluctuations with impact parameter displays direct evidence of viscous damping, which is larger for higher Fourier harmonics, in line with expectations from hydrodynamics. We use intensive measures of non-Gaussian flow fluctuations, which have reduced dependence on centrality. We infer from ATLAS data the magnitude of these intensive non-Gaussianities in each Fourier harmonic. They provide data-driven estimates of response coefficients to initial anisotropies, without resorting to any specific microscopic model of initial conditions. These estimates agree with viscous hydrodynamic calculations.

   ↳ nucl-thhep-exhep-phnucl-exPRC(2025)·5 citations
4. 04*

   Dipole Polarizability of Finite Nuclei as a Probe of Neutron Stars

   P.S. Koliogiannis🇭🇷 · E. Yuksel🇬🇧 · T. Ghosh · N. Paar🇭🇷

   Nuclear ground state and collective excitation properties provide a means to probe the nuclear matter equation of state and establish connections between observables in finite nuclei and neutron stars. Specifically, the electric dipole polarizability, measured with high precision in various neutron-rich nuclei, serves as a robust constraint on the density dependence of the symmetry energy. In this Letter, we employ a class of relativistic energy density functionals in a twofold process: first, to link the electric dipole polarizability from recent experiments to the slope of the symmetry energy, and second, to translate this information into constraints on the tidal deformability and radii of neutron stars, in connection with multimessenger astrophysical observations from pulsars and binary neutron stars. We provide compelling evidence that the electric dipole polarizability represents a key nuclear observable to probe the neutron star properties. By significantly reducing the uncertainties in the mass-radius plane, our findings also align with recent multimessenger observations.

   ↳ nucl-thastro-ph.HEastro-ph.SRnucl-exApJL(2026)·4 citations
5. 05*

   The semi-classical Floquet-Markov master equation for Monte Carlo spin integration

   Raymond Tat🇺🇸

   In designing an experiment to measure a neutron electric dipole moment (nEDM), it is often necessary to determine the behavior of an ensemble of spins under time-dependent and randomly fluctuating magnetic fields. This is particularly relevant for the proposed nEDM@SNS experiment, which features ultra-cold neutrons (UCNs) and helium-3 atoms occupying the same measurement cell, as well as a sinusoidal dressing field. In this work, we investigate a new technique to calculate the frequency shifts arising from magnetic field inhomogeneities and motional magnetic fields, particularly in the case where the spins in question are subjected to a time-periodic magnetic field. The method is based on Floquet theory, a general framework for analyzing periodic linear differential equations, and Redfield theory, which governs the time evolution of the density matrix in the presence of weak couplings to an environment. We benchmark the results against the analytical results derived for the static magnetic field case, as well as against the results of a conventional Runge-Kutta integrator, and find agreement with both. We further study the performance of the method, and find order-of-magnitude improvements in runtime over the conventional integrator.

   ↳ cond-mat.quant-gasnucl-exphysics.atom-phPRA(2025)·2 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.