Nuclear Theory·nucl-th

Wednesday·December 25, 2024

10 papers—5 primary·5 cross-listed

06
[Submitted on 23 Dec 2024] (cross-list from hep-ph)
Improving $π π$ dispersive analyses and resonance determination with Forward Dispersion Relations
P. Rabán🇪🇸 · J.R. Peláez🇪🇸 · J. Ruiz de Elvira🇪🇸
We present preliminary results of an improved pion-pion scattering dispersive analysis that includes: a refined treatment of inelasticities, the introduction of G-waves, the extension of Forward Dispersion Relations as constraints up to 1.6 GeV, and data description up to roughly 1.8 GeV. Additionally, we impose Roy-like dispersion relations. As a result, we obtain three reliable solutions corresponding to three different datasets. From the Forward Dispersion Relation output, we extract resonance pole parameters in a parameterization-independent way using continued fractions.
Comments:
6 pages, 3 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
arXiv:
2412.17932 [pdf]
PoS(2025)·0 citations
07
[Submitted on 24 Dec 2024] (cross-list from hep-ph)
Low-Energy Neutrino-Nucleus Scattering and New Physics
S. Carey🇺🇸 · V. Pandey🇺🇸
The interactions of low-energy neutrinos with nuclei provide a unique window to explore various Standard Model (SM) and Beyond the Standard Model (BSM) processes. In particular, the recent observation of coherent elastic neutrino-nucleus scattering (CEvNS), predicted over five decades ago, has generated significant interest across disciplines. With its high cross section and suitability for compact detectors, particularly with stopped pion neutrinos, CEvNS offers a powerful probe for light, weakly coupled new physics. Ongoing global experimental efforts now aim to leverage CEvNS to test SM predictions and search for BSM signals, where deviations in event rates or spectra could reveal new physics. We present here an estimate of the number of recoil events obtained from CEvNS using the current and upcoming liquid argon based experiments. Furthermore, the event rate due to the inclusion of neutrino magnetic moment is also discussed.
Comments:
Proceedings of the 25th International Workshop on Neutrinos from Accelerators (NuFact 2024)
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2412.18055 [pdf]
1 citation
08
[Submitted on 24 Dec 2024] (cross-list from hep-ph)
Heavy-Quark Spin Symmetry Violation effects in Charmed Baryon Production
Nantana Monkata🇹🇭 · Prin Sawasdipol🇹🇭 · Nongnapat Ponkhuha🇹🇭 · Ratirat Suntharawirat🇹🇭 · Ahmad Jafar Arifi🇯🇵 · Daris Samart🇹🇭
In this work, we investigate the Heavy-Quark Spin Symmetry (HQSS) exhibited in the effective Lagrangians governing the three-point interactions of $D$ mesons, charmed baryons, and nucleons. We first construct the effective Lagrangians, and there are 12 distinct terms. As a result, we observe that the invariant Lagrangian under HQSS manifests exclusively in the pseudoscalar $D$ mesons coupling to nucleons and $Λ_{c}$ baryons, whereas nucleons and $Σ_{c}$ ( $Σ_{c}^{*}$ ) baryons only couple with vector $D$ mesons. By taking into account the violated heavy-quark spin transformation, one can recover all interactions from the effective Lagrangians. Furthermore, we compute the differential cross-sections of the $p p ˉ \to Y_{c} Y ˉ_{c}^{'}$ scatterings, where $Y_{c}, Y_{c} ˉ^{'} = Λ_{c}, Σ_{c}, Σ_{c}^{*}$ , to reveal the residue of the violating HQSS (VHQSS) on charmed baryon production. Ultimately, by accounting for VHQSS, we aim for precise predictions of production rates, which are essential for the High-Energy Storage Ring (HESR) experiments at the Facility for Antiproton and Ion Research (FAIR).
Comments:
23 pages, 10 figures, 2 tables
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2412.18280 [pdf]
0 citations
09
[Submitted on 24 Dec 2024] (cross-list from physics.atom-ph)
Using the Th III Ion for a Nuclear Clock and Searches for New Physics
V. A. Dzuba🇦🇺 · V. V. Flambaum🇦🇺
The 229Th nucleus possesses a unique low-frequency transition at 8.4 eV, which is being considered for the development of an extremely accurate nuclear clock. We investigate an electronic bridge process in the Th III ion, where nuclear excitation occurs via electronic transitions, and demonstrate that a proper choice of laser frequencies can lead to 10,000 enhancement of this effect. Electrons also reduce 1.7 times the lifetime of the nuclear excited state. Additionally, the electronic structure of the Th III ion exhibits features that make it particularly useful for probing new physics. Notably, it contains a metastable state connected to the ground state via a weak M2 transition, which can be utilized for quantum information processing, as well as searches for oscillating axion field, violation of local Lorentz invariance, test of the Einstein's equivalence principle, and measurement of nuclear weak quadrupole moment. The electronic states of the ion present a unique case of level crossing involving the 5f, 6d, and 7s single-electron states. This crossing renders the transition frequencies highly sensitive to potential time-variation of the fine-structure constant.
Subjects:
Atomic Physics (physics.atom-ph); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2412.18308 [pdf]
PRA(2025)·4 citations
10
[Submitted on 24 Dec 2024] (cross-list from hep-ph)
Non-radial oscillations of hadronic neutron stars, quark stars, and hybrid stars : Calculation of $f$ , $p$ , and $g$ mode frequencies
Atanu Guha🇰🇷 · Debashree Sen🇰🇷 · Chang Ho Hyun🇰🇷
The composition and equation of state (EoS) of dense matter relevant to compact stars are quite inconclusive. However, certain observational constraints on the structural properties of compact stars help us constrain the EoS to a fair extent. Moreover, gravitational asteroseismology gives a notion of the composition and EoS of compact stars. The next generation gravitational wave (GW) detectors are likely to detect several oscillation mode frequencies of the GWs. In this work we compute the fundamental ( $f$ ) and the first pressure ( $p_{1}$ ) mode frequencies ( $f_{f}$ and $f_{p 1}$ , respectively) with different compositions viz., hadronic, quark, and hybrid star (HS) matter. For HSs, we also study the gravity ( $g$ ) mode frequency ( $f_{g}$ ). For each phase we also study the correlation between the oscillation frequencies of 1.4 $M_{⊙}$ and 2.01 $M_{⊙}$ compact stars with other different properties. We find that various possible composition of compact stars substantially affects the oscillation frequencies. However, the mass-scaled angular $f$ mode frequency ( $ω_{f} M$ ) varies universally with compactness ( $C$ ) for all hadronic, quark and hybrid stars. The $f$ mode frequency ( $f_{f_{1.4}}$ ) of the canonical 1.4 $M_{⊙}$ compact star, obtained with different composition, is quite correlated with the canonical radius ( $R_{1.4}$ ) and tidal deformability ( $Λ_{1.4}$ ) while $f_{p_{1.4}}$ is well correlated with slope parameter of the symmetry energy. We also show that $f_{g_{1.4}}$ of the HSs varies almost linearly with $Λ_{1.4}$ . Should $g$ modes be detected, they could not only support the existence of HSs, but $f_{g}$ could be useful to understand the strength of quark repulsion in HSs.
Comments:
38 Pages, 12 Figures; Accepted for publication in EPJC
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
arXiv:
2412.18569 [pdf]
EPJC(2025)·11 citations

Affiliations

first authorsco-authorsvia INSPIRE

Improving ππ dispersive analyses and resonance determination with Forward Dispersion Relations

Low-Energy Neutrino-Nucleus Scattering and New Physics

Heavy-Quark Spin Symmetry Violation effects in Charmed Baryon Production

Using the Th III Ion for a Nuclear Clock and Searches for New Physics

Non-radial oscillations of hadronic neutron stars, quark stars, and hybrid stars : Calculation of f, p, and g mode frequencies

Affiliations

Improving $π π$ dispersive analyses and resonance determination with Forward Dispersion Relations

Non-radial oscillations of hadronic neutron stars, quark stars, and hybrid stars : Calculation of $f$ , $p$ , and $g$ mode frequencies