Thu·Jan 8, 2026Thursday·January 8, 2026

1. 01*

   Estimating JUNO's Sensitivity to Solar Neutrino-to-antineutrino Conversion and Neutrino Magnetic Moments

   C. V. Ventura🇵🇪 · Saul J. Panibra Churata🇵🇪

   We investigated JUNO's sensitivity to a possible conversion of solar neutrinos into antineutrinos via the spin-flavor precession (SFP) mechanism, and assessed the implications for constraining the neutrino-magnetic moment (NMM). Using a sensitivity-based framework appropriate for counting experiments with no prior observations, we derive 90\% C.L.\ ensemble-average sensitivities on the solar antineutrino flux for 1.8--16.8 MeV and 8.0--16.8 MeV. For the entire energy window, the results do not improve the restrictions of other experiments; the relevance occurs in the highes-energy window. In this window, we report a flux of ${\varphi }_{\lim }\le 4.01\times 10^1\mathrm{c}{\mathrm{m}}^{-2}{\mathrm{s}}^{-1}$ and a probability of $P_{{\nu }_e\to {\bar{\nu }}_e}\le 2.07\times 10^{-5}$, the latter normalized to the ${}^8$B flux above threshold, ${\Phi }_{\mathrm{SSM}}(E>8\mathrm{MeV})$. Assuming transverse solar magnetic fields of $B_{\perp }=50$ and $100$~kG, the corresponding magnetic-moment sensitivities are ${\mu }_{\nu }\le 7.27\times 10^{-11}{\mu }_B$ and $3.64\times 10^{-11}{\mu }_B$ in the high-energy window. These results highlight that JUNO has the potential to achieve sensitivities comparable to the most stringent astrophysical limits; in particular, the high-energy selection (8.0--16.8~MeV) provides a sensitivity that is competitive with current results, while the full-energy window remains primarily limited by near-reactor backgrounds.

   hep-phApJ(2025)·1 citation
2. 02*

   A Direct Algebraic Pathway to Hadronic Observables in the Contact Model

   Jiayin Kang🇨🇳 · Zanbin Xing🇨🇳 · Lei Chang🇨🇳

   We present a novel algebraic framework for computing hadron properties directly within the contact interaction model. Utilizing Fierz transformations, the method recasts the Bethe-Salpeter dynamics into equations for a minimal set of \emph{projected amplitudes} for bound-state static properties and form factors, bypassing the conventional need for the meson wave function. This approach is fully demonstrated for the vector meson, enabling the direct extraction of its decay constants and form factors. The formalism provides a more efficient and unified pathway to hadron observables, with clear potential for extension to baryons and more sophisticated interactions.

   hep-phPRD(2026)·0 citations
3. 03*

   Fully-strange tetraquarks: fall-apart decays and experimental candidates

   Feng-Xiao Liu🇨🇳 · Xian-Hui Zhong🇨🇳 · Qiang Zhao🇨🇳

   We presents a systematic analysis of the fall-apart decays for the $1S$, $1P$, and $2S$-wave fully-strange tetraquark states. It shows that most of the fully-strange tetraquark states have a relatively narrow fall-apart decay width of $\mathcal{O}(10)$ MeV. The newly observed axial-vector state $X(2300)$ at BESIII may favor the low-lying $1S$-wave $1^{+-}$ state $T_{(4s)1^{+-}}(2323)$, while the $X(2500)$ resonance observed in the earlier BESIII experiment may favor the low-lying $1P$-wave $0^{-+}$ state $T_{(4s)0^{-+}}(2481)$. Some fully-strange tetraquark states predicted in theory can be searched for in their dominant fall-apart decay channels in experiment, such as $\varphi \varphi$, $\varphi \varphi (1680)$, ${\eta }^{(\prime )}\varphi$, ${\eta }^{(\prime )}{h}_1(1415)$, and $\varphi f_2^{\prime }(1525)$, to which they have relatively large couplings.

   hep-ph4 citations
4. 04*

   Role of $\Sigma (1660)$ in the $K^{-}p\to {\pi }^0{\pi }^0{\Sigma }^0$ reaction

   Xing-Yi Ji🇨🇳 · Si-Wei Liu🇨🇳 · Wen-Tao Lyu🇨🇳 · De-Min Li🇨🇳 · En Wang🇨🇳 · Ju-Jun Xie🇨🇳

   The processes of $K^{-}p\to {\pi }^0{\pi }^0{\Sigma }^0$ and $K^{-}p\to {\pi }^0\Lambda (1405)$ are studied within the effective Lagrangian approach. In addition to the ``background" contribution from the $u$-channel nucleon pole term, contribution from the $\Sigma (1660)$ resonance with spin-parity $J^P=1/2^{+}$ is also considered. For the $K^{-}p\to {\pi }^0{\pi }^0{\Sigma }^0$ reaction, we perform a calculation for the total and differential cross sections by considering the contribution from the $\Sigma (1660)$ intermediate resonance decaying into ${\pi }^0\Lambda (1405)$ with $\Lambda (1405)$ decaying into ${\pi }^0{\Sigma }^0$. With our model parameters, the available experimental data on both the $K^{-}p\to {\pi }^0{\pi }^0{\Sigma }^0$ and $K^{-}p\to {\pi }^0\Lambda (1405)$ reactions can be fairly well reproduced. It is shown that we really need the contribution from the $\Sigma (1660)$ resonance, and that these experimental measurements could be used to determine some properties of the $\Sigma (1660)$ resonance.

   hep-phnucl-thCPC(2026)·0 citations
5. 05*

   Why is the $Z_c(3900)$ absent in the $h_c\pi$ final state?

   Quanxing Ye🇨🇳 · Ying Zhang🇨🇳 · Peng-Yu Niu🇨🇳 · Qian Wang🇨🇳

   In this work, we perform a comprehensive phenomenological analysis of the exotic hadronic states $Z_c(3900)$, $Z_c(4020)$, $Z_b(10610)$ and $Z_b(10650)$ within the framework of Heavy Quark Spin Symmetry (HQSS) and its violation. By constructing S-wave contact interactions between elastic ($D{\bar{D}}^{\ast }/D^{\ast }{\bar{D}}^{\ast }$ or $B{\bar{B}}^{\ast }/B^{\ast }{\bar{B}}^{\ast }$) and inelastic ($J/\psi \pi ,h_c\pi$ or ${\rm Y}\pi$, $h_b\pi$) channels, we solve the Lippmann-Schwinger equation to obtain physical production amplitudes and perform a global fit to experimental invariant-mass spectra. Our results demonstrate a striking difference between the charm and bottom sectors: HQSS violation is negligible in the bottom system, leading to comparable peak structures for both $Z_b$ states in all hidden-bottom decay channels. In contrast, significant HQSS breaking is required to describe the $Z_c$ system, where the violation is predominantly concentrated in the elastic interactions. This explains the observed selectivity: $Z_c(3900)$ appears prominently only in $J/\psi \pi$, while $Z_c(4020)$ appears only in $h_c\pi$. Pole analysis confirms the molecular nature of the states, with the $Z_c(4020)$ likely arising from a threshold cusp effect. The model's robustness is verified against variations of the form factor and cutoff, showing stable results.

   hep-phPRD(2026)·2 citations
6. 06*

   Chiral anomaly: from vacuum to Columbia plot

   Francesco Giacosa🇵🇱 · Győző Kovács🇵🇱 · Péter Kovács🇭🇺 · Robert D. Pisarski🇺🇸 · Fabian Rennecke🇩🇪

   We use a low-energy effective approach, the extended linear sigma model, to study realizations of the $U(1{)}_A$ anomaly with different operators, linear and quadratic in the 't Hooft determinant. After discussing the parameterization in agreement with vacuum's phenomenology, we investigate the influence of these different anomaly terms on the Columbia plot: the square of the 't Hooft determinant favors a cross-over for small quark masses. Finally, we also discuss the extension of the 't Hooft determinant to cases in which different mesonic multiplets interact with each other. Novel chiral anomalous interaction terms involving excited (pseudo)scalar states, pseudovector, and pseudotensor mesons are expressed via a mathematical extension of the determinant, denoted as a polydeterminant.

   hep-phhep-thJ.Subatomic Part.Cosmol.(2026)·0 citations
7. 07*

   Addicted to Flavour: 1976-2026

   Andrzej J. Buras🇩🇪

   I describe my activities in Flavour Physics from 1976 to 2026. However, this 50th anniversary is not the only motivation for this writing. The second reason is the 350th anniversary of the discovery of the first animalcula by van Leeuvanhoek in 1676. Flavour physics makes it possible to search for new animalcula at distance scales far shorter than those resolved by van Leeuwenhoek in 1676 and even shorter than those directly accessible at the Large Hadron Collider. Achieving this goal requires not only precise measurements of a wide variety of processes, but also equally precise theoretical calculations, both within the Standard Model (SM) and beyond it. In this respect, next-to-leading-order (NLO) and next-to-next-to-leading-order (NNLO) QCD calculations of various Wilson coefficients in the SM and beyond it, in which I was involved for two decades, as well as reliable treatments of non-perturbative QCD effects, are indispensable. Equally important is the proper choice of observables that are best suited to revealing these new animalcula of particle physics. Moreover, in my view it is crucial to develop strategies for the search for New Physics (NP) that go beyond the global fits that are very popular today. While effective field theories such as WET and SMEFT are formulated in terms of Wilson coefficients of the relevant operators, with correlations characteristic of the SM and of specific NP scenarios, the most direct tests of the SM and its extensions are, in my opinion, correlations among different observables that are characteristic of particular new animalcula at work. Numerous colourful plots in this article illustrate this point. I hope that these ideas are clearly conveyed in my Flavour Autobiography, which also includes my memories of many conferences, workshops, and schools, as well as related anecdotes that are not always directly connected to physics.

   hep-phhep-exhep-lathep-th3 citations
8. 08*

   Topological quantization of vector meson anomalous couplings

   Chao-Qiang Geng🇨🇳 · Chia-Wei Liu🇨🇳 · Yue-Liang Wu🇨🇳

   We identify an overlooked Wess--Zumino--Witten structure in the hidden-local-symmetry~(HLS) formulation of vector mesons. The newly identified term generically leads to the topological quantization of the vector-meson anomalous couplings. If confirmed experimentally, this structure would expose the gauge nature of vector mesons in the anomalous sector and single out HLS over matter-field descriptions. The observed success of vector-meson dominance in anomalous interactions can then be explained by topological-action saturation of the odd-intrinsic-parity processes. Precision measurements of ${\eta }^{(\prime )}\to {\pi }^{+}{\pi }^{-}{\gamma }^{\ast }$ form factors at BESIII and the Super $\tau$-Charm Facility can directly test this saturation picture.

   hep-phhep-ex1 citation
9. 09*

   Beyond Form Factors: Precise Angular Tests in Hadronic $\tau$ Decays

   E. Estrada🇲🇽 · E. Passemar🇺🇸 · S. Paz🇪🇸 · A. Rodríguez-Sánchez🇪🇸 · P.Roig🇲🇽

   Semileptonic $\tau$ decays mainly proceed via interactions between charged lepton and quark currents. The hadronization of the quark current is intrinsically nonperturbative and generally cannot be addressed analytically. In these proceedings, we propose using symmetry arguments alone to construct clean angular observables, which, within the Standard Model and in the absence of long-distance electromagnetic corrections, remain form-factor independent. These predictions can be experimentally tested, and any observed deviation could signal either effects of physics beyond the Standard Model or provide a clean benchmark for long-distance electromagnetic corrections. We also perform a first estimate of the expected impact of new physics in an EFT framework.

   hep-phhep-ex1 citation
10. 10*

    Axion-like particles from soft supersymmetry breaking

    Gayatri Ghosh🇮🇳

    We study a supersymmetric effective field theory in which the mass of an axion-like particle (ALP) is generated predominantly by soft supersymmetry-breaking effects. The Peccei--Quinn symmetry is exact in the supersymmetric limit and is explicitly broken only by soft terms induced by supergravity, leading to a naturally heavy ALP whose mass is controlled by the supersymmetry-breaking scale. We analyze the resulting ALP, saxion, and axino spectrum and investigate the phenomenological implications for laboratory searches, astrophysical observations, and cosmology. The framework is treated as an effective field theory without specifying a unique ultraviolet completion, and no attempt is made to explain the origin of a small strong CP phase, which is assumed to be suppressed by ultraviolet physics or by an independent mechanism. Instead, the focus is on the generic and testable phenomenology of heavy axion-like particles whose masses arise from supersymmetry breaking.

    hep-phJHEP(2026)·1 citation
11. 11*

    Effect of event classification on the Tsallis-thermometer

    Laszlo Gyulai🇭🇺 · Gabor Biro🇭🇺 · Robert Vertesi🇭🇺 · Gergely Gabor Barnafoldi🇭🇺

    We analyze identified hadron spectra in pp collisions at $\sqrt{s}=13$ TeV measured by ALICE within a non-extensive statistical framework. Spectra classified by multiplicity, flattenicity, and spherocity were fitted with the Tsallis-Pareto distribution, and the parameters were studied on the Tsallis-thermometer. Multiplicity and flattenicity classes follow a previously observed scaling, while the non-extensivity parameter shows a distinct sensitivity to the spherocity. A data-driven parametrization confirms a proportionality between the Tsallis temperature and mean transverse momentum, offering a simple estimate of the effective temperature. These results highlight the ability of the Tsallis-thermometer to capture both multiplicity and event-shape effects, linking soft and hard processes in small systems.

    hep-phPRD(2026)·1 citation
12. 12*

    Complete NLO BFKL impact factors for quarkonium hadroproduction in NRQCD: the case of ${}^1{S}_0^{[1]}$, ${}^1{S}_0^{[8]}$, and ${}^3{S}_1^{[8]}$ states

    Michael Fucilla🇵🇱 · Jean-Philippe Lansberg🇫🇷 · Maxim Nefedov🇮🇱 · Lech Szymanowski🇵🇱 · Samuel Wallon🇫🇷

    We present the first complete next-to-leading-order calculation of the impact factors for hadroproduction of the ${}^1{S}_0^{[1]}$, ${}^1{S}_0^{[8]}$, and ${}^3{S}_1^{[8]}$ NRQCD states within the BFKL formalism. We complete the recent virtual-correction computation presented in JHEP 12 (2024) 129 by that of the real-emission contributions. We observe the cancellation of the soft divergences between these real- and virtual-emission contributions and we note that the surviving collinear singularities are compatible with factorisation up to one loop for a novel class of processes where BFKL resummation can be applied. Our work indeed represents the first complete NLO quarkonium impact factor in the BFKL framework and paves the way to first next-to-leading-logarithmic-precision studies for hadroproduction of forward-backward quarkonium associated production at hadron colliders.

    hep-phhep-exnucl-thJHEP(2026)·0 citations
13. 13*

    Spectator Composes a Gravitational Canon: Spectator-field-triggered Phase Transition During Inflation and its Anisotropic Gravitational Wave Signals

    Yunjia Bao🇺🇸 · Keisuke Harigaya🇺🇸

    We propose a general framework in which a phase transition is triggered during cosmic inflation by the slow-roll dynamics of a spectator field. The topological defects formed at the transition are inflated outside the horizon, reenter it after inflation, and can subsequently generate characteristic gravitational-wave (GW) signals. Quantum fluctuations of the spectator field modulate the timing of the transition, imprinting large-scale anisotropies in the resulting GW background. As an explicit realization, the spectator field may be identified with the Higgs field in a supersymmetric Standard Model. More generally, our framework applies to a wide class of spectator-modulated phenomena, providing a generic mechanism for producing anisotropic GW signals.

    hep-phastro-ph.COgr-qchep-th3 citations
14. 14*

    Threshold resummation of rapidity distributions at fixed partonic rapidity

    Lorenzo De Ros🇩🇪 · Stefano Forte🇮🇹 · Giovanni Ridolfi🇮🇹 · Davide Maria Tagliabue🇩🇪

    We derive a general expression for the resummation of rapidity distributions for processes with a colorless final state, such as Drell-Yan or Higgs production, in the limit in which the center-of-mass energy goes on threshold, but with fixed rapidity of the Higgs or gauge boson in the partonic center-of-mass frame. The result is obtained by suitably generalizing the renormalization-group based approach to threshold resummation previously pursued by us. The ensuing expression is valid to all logarithmic orders but the resummation coefficients must be determined by comparing to fixed order results. We perform this comparison for the Drell-Yan process using the fixed-order next-to-next-to-leading (NNLO) result, thereby determining resummation coefficients up to next-to-next-to-leading logarithmic (NNLL) accuracy, for the quark-antiquark coefficient function in the quark nonsinglet channel. We provide a translation to direct QCD of a result for this resummation previously obtained using SCET methods, and we show that it agrees with our own.

    hep-phJHEP(2026)·2 citations
15. 15*

    Metastable cosmic strings are broken at the start

    Lorenzo Tranchedone🇬🇧 · Ethan Carragher🇬🇧 · Edward Hardy🇬🇧 · Natálie Koscelanská van IJcken🇬🇧

    We show that metastable cosmic strings break at early times, either via finite-temperature effects or by attaching to pre-existing monopoles during network percolation. The resulting segments can be initially super-horizon in size and thus persist for a significant amount of time. If the strings do not re-percolate, the network's eventual destruction is typically due to this early-time breaking rather than late-time quantum tunnelling. Survival of strings to epochs probed by NANOGrav requires $m_M^2/\mu \gtrsim 10^3$, where $m_M$ and $\mu$ are the monopole mass and the string tension respectively, over an order of magnitude larger than previous estimates. We also revisit quantum-tunnelling induced breaking. Results from numerical simulations suggest that this occurs mainly at rare high-tension points on the strings, yielding a rate much larger than is usually assumed. We briefly discuss the related scenario of flux tubes in a dark QCD-like hidden sector with dark-quark masses above the confinement scale.

    hep-phastro-ph.COJHEP(2026)·8 citations
16. 16*

    Compatibility of the Updated $(g-2{)}_{\mu }$, $(g-2{)}_e$ and PADME-Favored Couplings with the Preferred Region of ATOMKI X17

    Emrys Peets🇺🇸

    We re-evaluate the viability of a kinetically mixed dark photon ($A^{\prime }$) as a solution to the muon anomalous magnetic moment $(g-2)\mu$ discrepancy and the ATOMKI nuclear anomalies near 17~MeV, using the final FNAL measurement and the latest theory predictions (BMW21, WP25). For $m_{A^{\prime }}=17$~MeV, the allowed kinetic mixing parameter narrows to ${\epsilon }_{\mu }=7.03(58)\times 10^{-4}$ (WP25). We then directly compare the allowed region for the muon and X17 bands to those preferred by the electron magnetic moment measurements. For the electron, we obtain ${\epsilon }_e=1.19(15)\times 10^{-3}$ (Cs, 2018) and ${\epsilon }_e=0.69(15)\times 10^{-3}$ (Rb, 2020), based on two recent measurements of the fine structure constant compared to the most recent experimental value determined using a one-electron quantum cyclotron. This study focuses on the protophobic vector interpretation of X17 and assumes ${\epsilon }_{\nu }<<{\epsilon }_l$. While a mild tension persists, we identify a narrow overlapping region, $6.8\times 10^{-4}\lesssim \epsilon \lesssim 9.6\times 10^{-4}$, between recent PADME results, the NA64 exclusion, and within the 2$\sigma$ preferred coupling region given by the Rb 2020 determination of ${\alpha }_{\epsilon }$. These results provide well-defined targets for future experimental searches and motivate further theoretical refinements, both of which will play a decisive role in assessing the validity of the ATOMKI anomaly claims. Of particular note is the fixed target X17 experiment to be conducted in Hall-B of Thomas Jefferson National Accelerator Facility in Summer of 2026.

    hep-phhep-ex0 citations
17. 17*

    A universal vision transformer for fast calorimeter simulations

    Luigi Favaro🇧🇪 · Andrea Giammanco🇧🇪 · Claudius Krause🇦🇹

    The high-dimensional complex nature of detectors makes fast calorimeter simulations a prime application for modern generative machine learning. Vision transformers (ViTs) can emulate the Geant4 response with unmatched accuracy and are not limited to regular geometries. Starting from the CaloDREAM architecture, we demonstrate the robustness and scalability of ViTs on regular and irregular geometries, and multiple detectors. Our results show that ViTs generate electromagnetic and hadronic showers with minimal deviations from Geant4 in multiple evaluation metrics, while maintaining the generation time in the $\mathcal{O}(10-100)$ ms on a single GPU. Furthermore, we show that pretraining on a large dataset and fine-tuning on the target geometry leads to reduced training costs and higher data efficiency, or altogether improves the fidelity of generated showers.

    hep-phcs.LGhep-exphysics.ins-detMach.Learn.Sci.Tech.(2026)·4 citations
18. 18*

    Real-time Gravitational Wave Response in Thermal Spinning fields

    Atsuhisa Ota🇨🇳 · Hui-Yu Zhu🇰🇷 · Yuhang Zhu🇰🇷

    We study how the spin content of the thermal plasmas affects the propagation of gravitational waves in a radiation-dominated universe. As a simple but representative setup, we consider conformal scalar, Weyl fermion, and Maxwell fields that provide the background radiation, and we ask whether the resulting damping and phase shift of gravitational waves retain any memory of their spins. We revisit this question in a real-time quantum-field-theoretic framework, where the stress tensor splits into a background part, a dynamical (history-dependent) response, and local contact terms, with an additional on-shell projection fixed by the Friedmann equation. We find that the dynamical spin-dependent response arises on a short time scale characterized by the radiation temperature, which is exactly canceled by the local responses. As a result, the remaining long-time response is universal and consistent with kinetic theory in the hard thermal limit. Although the underlying mechanism exhibits strong spin dependence, it leaves no observable imprint on the large-scale effective dynamics of gravitational waves in this setup.

    ↳ hep-thastro-ph.COgr-qchep-phJHEP(2026)·2 citations
19. 19*

    Light-Flavour Resonance Production in High-Energy Heavy-Ion Collisions: An Experimental Review

    Prottay Das🇨🇭 · Ajay Kumar Dash🇮🇳 · Sandeep Dudi🇮🇹 · Sourav Kundu🇨🇭 · Dukhishyam Mallick🇮🇹 · Bedangadas Mohanty🇮🇳 · Md Nasim🇮🇳 · Kishora Nayak🇮🇳 · Aswini Kumar Sahoo🇨🇳 · Subhash Singha🇨🇳 · Ranbir Singh🇮🇳

    Resonances provide sensitivity to the late-stage dynamics of heavy-ion collisions, as their lifetimes are comparable to the duration of the hadronic phase. This review summarizes state-of-the-art measurements of light-flavour mesonic and baryonic resonances, including $\rho$(770), $K^{\star }$(892), $\varphi$(1020), $\Delta$(1232), ${\Lambda }^{\star }$(1520), ${\Sigma }^{\star }$(1385) and ${\Xi }^{\star }$(1530), in pp, p-A and A-A collisions at SPS, RHIC and the LHC. Systematic trends in yields, mass and width modifications, transverse-momentum spectra, nuclear modification factors, and particle ratios reveal the interplay of re-scattering and regeneration, medium-induced suppression, and the development of collective dynamics with increasing system size and multiplicity. Anisotropic flow results confirm the coupling of resonances to the expanding medium, while recent vector-meson spin-alignment measurements offer fresh insights into hadronization mechanisms and local fields. Ultra-peripheral collisions provide vacuum-like baselines for isolating in-medium effects. Emerging opportunities for charm-resonance studies in upcoming high-luminosity experiments are also outlined.Together, these advances demonstrate the important role of resonance measurements in constraining the space-time evolution of strongly interacting matter.

    ↳ nucl-exhep-exhep-phPPNP(2026)·2 citations
20. 20*

    Renormalizable and unitary nonlocal quantum field theory with CPT violation and its implication

    Moshe M. Chaichian🇫🇮 · Markku A. Oksanen🇫🇮 · Anca Tureanu🇫🇮

    It is a common belief that any relativistic nonlocal quantum field theory encounters either the problem of renormalizability or unitarity or both of them. It is also known that any local relativistic quantum field theory (QFT) possesses the CPT symmetry. In this Letter we show that a previously proposed nonlocal Lorentz invariant QFT, which violates the CPT theorem, is both renormalizable and unitary, thus being a first presented example in the literature of such a nonlocal theory. The theory satisfies the requirement of causality as well. A further generalization of such a nonlocal QFT to include the gauge theories is also envisaged. In particular, dressing such a Standard Model with a CP violating phase, will make the theory satisfying most of the necessary criteria to finally explain the baryon asymmetry of the universe by a viable QFT. As for the necessity of baryon number violation, there are hopefully several possibilities such as by GUT and electroweak baryogenesis, leptogenesis or sphalerons.

    ↳ hep-thhep-ph1 citation
21. 21*

    Scattering phase shift in quantum mechanics on quantum computers

    Peng Guo🇺🇸 · Paul LeVan🇺🇸 · Frank X. Lee🇺🇸 · Yong Zhao🇺🇸

    We investigate the feasibility of extracting infinite volume scattering phase shift on quantum computers in a simple one-dimensional quantum mechanical model, using the formalism established in Ref.~\cite{Guo:2023ecc} that relates the integrated correlation functions (ICF) for a trapped system to the infinite volume scattering phase shifts through a weighted integral. The system is first discretized in a finite box with periodic boundary conditions, and the formalism in real time is verified by employing a contact interaction potential with exact solutions. Quantum circuits are then designed and constructed to implement the formalism on current quantum computing architectures. To overcome the fast oscillatory behavior of the integrated correlation functions in real-time simulation, different methods of post-data analysis are proposed and discussed. Test results on IBM hardware show that good agreement can be achieved with two qubits, but complete failure ensues with three qubits due to two-qubit gate operation errors and thermal relaxation errors.

    ↳ quant-phhep-lathep-phnucl-thPRD(2026)·5 citations
22. 22*

    Parity-violating Dark Photon Halos

    Stephon Alexander🇺🇸 · Lawrence Edmond IV🇺🇸 · Cooper Niu🇺🇸

    We propose a mechanism for the generation of gravitationally bound dark photon halos during the matter-dominated era. Coupled to an ultralight axion field through a parity-violating Chern-Simons term, dark photons can be produced by the tachyonic instability of axion coherent oscillation. The dark photons with a net helicity lead to a metric vorticity and can generate chiral substructures. For axion masses in the range $10^{-28}\mathrm{eV}\lesssim m_a\lesssim 10^{-22}\mathrm{eV}$, the resulting inhomogeneities collapse to form halos with masses spanning $M_{\mathrm{halo}}\sim 10^5{M}_{\odot }$ to $10^{11}{M}_{\odot }$, with halo sizes ranging from $O(1)$ to $O(10^6)\mathrm{pc}$. During halo collapse, the induced vorticity could mediate efficient angular-momentum transport, which enables monolithic collapse and provides primordial seeds for the early formation of supermassive black holes.

    ↳ gr-qcastro-ph.COhep-ph1 citation
23. 23*

    Three-particle scattering amplitudes from lattice QCD

    Stephen R. Sharpe🇺🇸

    I review recent progress in calculating scattering amplitudes and resonance properties involving three particles using results from lattice QCD. The necessary input is the finite-volume spectrum, and the outputs -- via solutions of integral equations -- are scattering amplitudes that can be continued into the complex plane to search for resonance poles. I describe the outlook for future extensions and applications of this work.

    ↳ hep-lathep-phhep-thnucl-thPoS(2026)·10 citations
24. 24*

    QFT as a set of ODEs

    Manuel Loparco🇨🇭 · Grégoire Mathys🇨🇭 · Joao Penedones🇨🇭 · Jiaxin Qiao🇨🇭 · Xiang Zhao🇨🇭

    Correlation functions of local operators in Quantum Field Theory (QFT) on hyperbolic space can be fully characterized by the set of QFT data $\{{\Delta }_i,C_{ijk},b_j^{\hat{\mathcal{O}}}\}$. These are the scaling dimensions of boundary operators ${\Delta }_i$, the boundary Operator Product Expansion (OPE) coefficients $C_{ijk}$ and the Boundary Operator Expansion (BOE) coefficients $b_j^{\hat{\mathcal{O}}}$ that characterize how each bulk operator $\hat{\mathcal{O}}$ can be expanded in terms of boundary operators ${\mathcal{O}}_j$.For simplicity, we focus on two dimensional QFTs and derive a universal set of first order Ordinary Differential Equations (ODEs) that encode the variation of the QFT data under an infinitesimal change of a bulk relevant coupling. In principle, our ODEs can be used to follow a Renormalization Group (RG) flow starting from a solvable QFT into a strongly coupled phase and to the flat space limit.

    ↳ hep-thhep-phJHEP(2026)·7 citations
25. 25*

    Neutrino decays as a natural explanation of the neutrino mass tension

    Guillermo Franco Abellán🇳🇱

    A new tension is emerging between the tight cosmological upper bounds on the total neutrino mass ($\sum m_{\nu }\lesssim 0.06\mathrm{eV}$) and the lower limits from oscillation experiments, with potentially far-reaching implications for cosmology and particle physics. Neutrinos decaying into massless BSM particles with lifetimes ${\tau }_{\nu }\sim 0.01-1\mathrm{Gyr}$ represent a theoretically well-motivated mechanism to reconcile such measurements. Using DESI DR2 and CMB datasets, we show that such decays relax the bound on the total neutrino mass up to $\sum m_{\nu }<0.23\mathrm{eV}$ (95%), restoring full agreement with oscillation data. We also present the first late-time cosmological analysis of neutrino decays into lighter neutrinos in a manner consistent with the measured mass splittings. In contrast to the decays into massless BSM particles, we find that this scenario only marginally alleviates - or even tightens - the cosmological neutrino mass bounds, depending on the mass ordering.

    ↳ astro-ph.COhep-phhep-thPRD(2026)·8 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.