Tue·Apr 9, 2024Tuesday·April 9, 2024

1. 01*

   Constraints on Lepton Number Violation with the 2 tonne$\cdot$yr CUORE Dataset

   CUORE Collaboration: D. Q. Adams🇺🇸 · C. Alduino🇺🇸 · K. Alfonso🇺🇸 · F. T. Avignone III🇺🇸 · O. Azzolini🇮🇹 · G. Bari🇮🇹 · F. Bellini🇮🇹 · G. Benato🇮🇹 · M. Beretta🇺🇸 · M. Biassoni🇮🇹 · A. Branca🇮🇹 · C. Brofferio🇮🇹 and 105 other authors

   Matter-antimatter asymmetry underlines the incompleteness of the current understanding of particle physics. Neutrinoless double-beta decay ($0\nu \beta \beta$) may help explain this asymmetry, while unveiling the Majorana nature of the neutrino. The CUORE experiment searches for $0\nu \beta \beta$ of ${}^{130}$Te using a tonne-scale cryogenic calorimeter operated at milli-kelvin temperatures. We report no evidence of $0\nu \beta \beta$ and place a lower limit on the half-life of $T_{1/2}>3.5\times$ 10${}^{25}$~years (90\% C.I.) with over 2~tonne$\cdot$year TeO${}_2$ exposure. The tools and techniques developed for this result and the 5 year stable operation of nearly 1000 detectors demonstrate crucial infrastructure for a future-generation experiment capable of searching for $0\nu \beta \beta$ across multiple isotopes.

   nucl-exScience(2025)·53 citations
2. 02*

   Evolution of the nuclear spin-orbit splitting explored via the ${}^{32}$Si($d$,$p$)${}^{33}$Si reaction using SOLARIS

   J. Chen🇨🇳 · B. P. Kay🇺🇸 · C. R. Hoffman🇺🇸 · T. L. Tang🇺🇸 · I. A. Tolstukhin🇺🇸 · D. Bazin🇺🇸 · R. S. Lubna🇺🇸 · Y. Ayyad🇪🇸 · S. Beceiro-Novo🇺🇸 · B. J. Coombes🇦🇺 · S. J. Freeman🇬🇧 · L. P. Gaffney🇬🇧 and 21 other authors

   The spin-orbit splitting between neutron 1$p$ orbitals at ${}^{33}$Si has been deduced using the single-neutron-adding ($d$,$p$) reaction in inverse kinematics with a beam of ${}^{32}$Si, a long-lived radioisotope. Reaction products were analyzed by the newly implemented SOLARIS spectrometer at the reaccelerated-beam facility at the National Superconducting Cyclotron Laboratory. The measurements show reasonable agreement with shell-model calculations that incorporate modern cross-shell interactions, but they contradict the prediction of proton density depletion based on relativistic mean-field theory. The evolution of the neutron 1$p$-shell orbitals is systematically studied using the present and existing data in the isotonic chains of $N=17$, 19, and 21. In each case, a smooth decrease in the separation of the $1p_{3/2}$-$1p_{1/2}$ orbitals is seen as the respective $p$-orbitals approach zero binding, suggesting that the finite nuclear potential strongly influences the evolution of nuclear structure in this region.

   nucl-exPLB(2024)·12 citations
3. 03*

   QCD Predictions for Meson Electromagnetic Form Factors at High Momenta: Testing Factorization in Exclusive Processes

   Heng-Tong Ding🇨🇳 · Xiang Gao🇺🇸 · Andrew D. Hanlon🇺🇸 · Swagato Mukherjee🇺🇸 · Peter Petreczky🇺🇸 · Qi Shi🇨🇳 · Sergey Syritsyn🇺🇸 · Rui Zhang🇺🇸 · Yong Zhao🇺🇸

   We report the first lattice QCD computation of pion and kaon electromagnetic form factors, $F_M(Q^2)$, at large momentum transfer up to 10 and 28 ${\mathrm{GeV}}^2$, respectively. Utilizing physical masses and two fine lattices, we achieve good agreement with JLab experimental results at $Q^2\lesssim 4{\mathrm{GeV}}^2$. For $Q^2\gtrsim 4{\mathrm{GeV}}^2$, our results provide $\text{ab-initio}$ QCD benchmarks for the forthcoming experiments at JLab 12 GeV and future electron-ion colliders. We also test the QCD collinear factorization framework utilizing our high-$Q^2$ form factors at next-to-next-to-leading order in perturbation theory, which relates the form factors to the leading Fock-state meson distribution amplitudes. Comparisons with independent lattice QCD calculations using the same framework demonstrate, within estimated uncertainties, the universality of these nonperturbative quantities.

   ↳ hep-lathep-phnucl-exnucl-thPRL(2024)·34 citations
4. 04*

   Quantum mechanical aspects of coherent photoproduction: the limits of coherence, and multiple vector mesons

   Spencer R. Klein🇺🇸

   Quantum mechanics is central to coherent photoproduction in ultra-peripheral collisions (UPCs). This writeup will discuss some surprising aspects of UPCs that stem from these quantum mechanical roots. The Good-Walker (GW) paradigm, which connects coherent photoproduction with the target nucleus remaining in its ground state. This contrasts with a semi-classical picture, where coherence depends on the positions of the individual nucleons and the momentum transfer. Unlike the GW approach, the semiclassical picture is consistent with the observed data on coherent photoproduction with nuclear breakup, and with coherent photoproduction in peripheral collisions. The semiclassical approach allows for a wider variety of coherent UPC reactions, such as coherent photoproduction of charged mesons, including some non $q\overline{q}$ exotica. Quantum mechanics is also key to the coherent photoproduction of multiple vector mesons by the interactions of a single ion pair. The vector mesons share a common impact parameter, and so can exhibit richer interference patterns than single mesons. At forward rapidities, the cross sections to produce multiple identical vector mesons are enhanced due to superradiance. With enough statistics, multi-meson events may provide an opportunity to observe stimulated decays.}

   ↳ hep-phnucl-exnucl-thquant-phPhys.Proc.UPC(2024)·3 citations
5. 05*

   Influence of the chiral magnetic effect on particle-pair elliptic anisotropy

   Han-Sheng Li🇺🇸 · Yicheng Feng🇺🇸 · Fuqiang Wang🇨🇳

   Chiral Magnetic Effect (CME) is a phenomenon in which electric charge is separated by a strong magnetic field from local domains of chirality imbalance in quantum chromodynamics. The CME-sensitive, azimuthal correlator difference $\Delta \gamma$ between opposite-sign (OS) and same-sign (SS) charged hadron pairs is contaminated by a major physics background proportional to the particle elliptic anisotropy ($v_2$). The CME signal, on the other hand, contributes to the difference in the pair elliptic anisotropies between OS and SS pairs ($\Delta v_{2,\mathrm{pair}}$). We investigate $\Delta v_{2,\mathrm{pair}}$ and found its sensitivity to CME to be similar to that of the $\Delta \gamma$ observable.

   ↳ hep-phnucl-exnucl-thPRC(2025)·6 citations
6. 06*

   Analysis of $B_s^0\to X(3872)[\psi (2S)]{\pi }^{+}{\pi }^{-}(K^{+}{K}^{-})$ decays

   Hao-Nan Wang🇨🇳 · Li-Sheng Geng🇨🇳 · Gang Li🇨🇳 · Ju-Jun Xie🇨🇳

   We have phenomenologically investigated the decays $B_s^0\to X(3872){\pi }^{+}{\pi }^{-}(K^{+}{K}^{-})$ and $B_s^0\to \psi (2S){\pi }^{+}{\pi }^{-}(K^{+}{K}^{-})$. In our analysis, the scalar meson $f_0(980)$ is formed through the final state interactions of coupled channels $\pi \pi$ and $K\bar{K}$. Our findings indicate that the ${\pi }^{+}{\pi }^{-}$ invariant mass distribution of the $B_s^0\to \psi (2S){\pi }^{+}{\pi }^{-}$ decay can be accurately reproduced. Furthermore, we have explored the ${\pi }^{+}{\pi }^{-}(K^{+}{K}^{-})$ invariant mass distribution of the $B_s^0\to X(3872){\pi }^{+}{\pi }^{-}(K^{+}{K}^{-})$ decay, accounting for the different production mechanisms between $X(3872)$ and $\psi (2S)$, up to a global factor. It is found that the production rates for $X(3872)$ and $\psi (2S)$ are much different, which indicates that the structure of $X(3872)$ is more complicated than the $\psi (2S)$, which is a conventional $c\bar{c}$ state. Additionally, we have considered the contributions from $f_0(1500)$ to ${\pi }^{+}{\pi }^{-}$ and the $\varphi$ meson to $K^{+}{K}^{-}$ in our analysis. Utilizing the model parameters, we have calculated the branching fraction of $B_s^0\to X(3872)K^{+}{K}^{-}$, and anticipate that the findings of our study can be experimentally tested in the future.

   ↳ hep-phhep-exnucl-exnucl-thPRD(2024)·3 citations
7. 07*

   Perspectives from a cold antideuteron beam in the AD/ELENA facility

   Ruggero Caravita🇮🇹

   The perspectives opened by the development of a low-energy antideuteron beam are here reviewed: precision measurements of the antideuteron properties; formation and spectroscopic analysis of antideuteronic atoms and antideuterium; the pioneering synthesis of heavier anti-elements in particle traps and at low energies. Some practical aspects of generating a low-energy antideuteron beam in the existing AD/ELENA facility are discussed.

   ↳ hep-phnucl-exphysics.acc-phphysics.atom-ph6 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.