Thu·Apr 23, 2026Thursday·April 23, 2026

1. 01*

   A First Account of the Impact of Ion Electromagnetic Dissociation on Event Exclusivity in Ultraperipheral LHC Collisions

   M. Dyndal🇵🇱 · L. A. Harland-Lang🇬🇧

   In this Letter we explore the modelling of hadron production in electromagnetic ion dissociation (EMD) processes in high-energy ultraperipheral collisions at LHC energies. Since EMD can accompany exclusive particle production in these interactions, we demonstrate that the resulting hadrons can break the exclusivity vetos typically imposed by experiments. As two representative examples, we calculate the impact on existing LHC measurements of exclusive muon pair production ($\gamma \gamma \to \mu \mu$) and exclusive coherent $J/\psi$ production. We demonstrate that accounting for this effect resolves long-standing tensions between theoretical predictions and experimental measurements.

   hep-phhep-exnucl-exnucl-th5 citations
2. 02*

   Ultra-High-Energy Tau Neutrinos as Probes of Lorentz Invariance

   Vedran Brdar🇺🇸 · Samiur R. Mir🇺🇸

   Neutrino telescopes have detected astrophysical neutrinos with energies up to $O(100)$ PeV. Several current and proposed experiments aim to observe neutrinos at even higher energies, with the goal of detecting cosmogenic neutrinos. This increase in neutrino energy makes tests of Lorentz invariance violation (LIV) particularly appealing, since the effects of higher-dimension LIV operators on neutrino propagation grow rapidly with energy. In this work, we investigate the potential of the upcoming experiments GRAND and POEMMA to probe LIV in the neutrino sector through the detection of ultra-high-energy tau neutrinos. We generate the cosmogenic neutrino flux using SimProp and interface it with a calculation of neutrino flavor transition probabilities in the presence of LIV effects. Deviations from standard flavor transition probabilities manifest as changes in the expected tau neutrino event rates at GRAND and POEMMA. We first consider the case with a single nonzero LIV operator of various dimensions, and find that the projected sensitivities exceed existing limits from lower-energy probes by orders of magnitude. We then explore scenarios with multiple nonzero LIV parameters and show that their interplay can significantly modify the sensitivities compared to the single-parameter case. Overall, we find that upcoming observations of ultra-high-energy tau neutrinos will place some of the most stringent constraints on LIV.

   hep-phastro-ph.HEhep-ex1 citation
3. 03*

   Sub-GeV dark matter from cosmic ray bremsstrahlung in the atmosphere

   Branden Aitken🇨🇦 · Peter Reimitz🇧🇷 · Adam Ritz🇨🇦

   We explore the sensitivity of neutrino observatories and direct dark matter detection experiments to boosted sub-GeV dark matter produced by inelastic cosmic ray collisions in the atmosphere. We revisit earlier approaches and extend the sensitivity to higher mass by modeling the proton bremsstrahlung production mode via initial state radiation. For vector-mediated dark matter models, the peak of the cosmic ray flux allows for enhanced DM production for mediator masses near the $\rho /\omega$ resonances. We determine and compare the ensuing sensitivity of direct detection experiments LZ and PandaX-4T and the neutrino detectors Borexino and Super-K.

   hep-phPRD(2026)·0 citations
4. 04*

   Introduction to transverse momentum imaging

   Andrea Signori🇮🇹

   This set of notes complements the lectures and recitation sessions discussed in the following graduate schools: HUGS at Jefferson Lab (years 2018, 2019, 2021), the International School and Workshop on Probing Hadron Structure at the Electron-Ion Collider at ICTS (2024), Frontiers in Nuclear and Hadronic Physics at GGI (2025), and the International Workshop and School on Hadron Structure and Strong Interactions at Nanjing University (2025).

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

   Photon and neutrino fluxes from spheroidal dwarf galaxies in a decaying DM model

   A. Carrillo-Monteverde🇲🇽 · L. López-Lozano🇲🇽 · F. San Juan-Villegas🇲🇽

   In this work, we investigate a decaying dark matter scenario and its associated indirect detection signatures. The model consists of a scalar singlet with a lifetime exceeding the age of the Universe. Stability is ensured by a $Z_2$ symmetry imposed on the Lagrangian, allowing decay through a non-minimal gravitational coupling. The decay of dark matter produces Standard Model particles, which subsequently yield products such as gamma rays, neutrinos, and charged particles. We computed the gamma-ray and neutrino fluxes generated by this candidate in the Milky Way and in 14 dwarf spheroidal galaxies, as well as the corresponding expected number of events in selected experiments, using dedicated numerical tools. Results are presented for three benchmark masses and three coupling values consistent with cosmological constraints, showing that the predicted signals can be observable in specific regions of parameter space.

   hep-phastro-ph.HE0 citations
6. 06*

   Graph-theoretic determination of massless modes in latticized theory-space models

   Ketan M. Patel🇮🇳

   A graph-theoretic method is introduced for analyzing fermion mass spectra in latticized theory-space models, including chain models arising from dimensional deconstruction. Fermion mass terms are mapped to bipartite graphs, with fields as vertices and nonvanishing mass terms as edges. The number of massless modes is shown to be fixed by the cardinality of a maximum matching of the associated graph. Moreover, the wave-function support of these modes is restricted to fields reachable from exposed or unmatched vertices by even-length maximum-matching-alternating paths, as characterized by the Dulmage-Mendelsohn decomposition. These results depend only on the topology of latticized theory space and are independent of model parameters. The method enables a systematic construction of latticized models with prescribed numbers and localization properties of massless modes.

   hep-phhep-thmath-phmath.MP0 citations
7. 07*

   Impact of nuclear deformation on particle production in $Ne+Ne$ collisions at \five from AMPT-SM

   M. U. Ashraf🇺🇸 · A. M. Khan🇺🇸 · M. Shahid🇺🇸 · Faraz Mohd Mehdi🇺🇸

   We present a systematic study of particle production in $Ne+Ne$ collisions at $\sqrt{s_{\mathrm{NN}}}=5.36$ TeV using the A Multi-Phase Transport (AMPT) model with string melting (SM) configuration. The analysis compares spherical and deformed configurations of ${}^{20}\mathrm{Ne}$ to investigate the influence of initial-state nuclear deformation on bulk observables. Charged-particle pseudorapidity ($⟨d{N}_{\mathrm{ch}}/d\eta ⟩$) densities, identified particle yields ($dN/dy$), transverse momentum ($p_T$) spectra, mean transverse momentum ($⟨p_{\mathrm{T}}⟩$), and $p_{\mathrm{T}}$-differential particle ratios ($K/\pi$ and $p/\pi$) are studied as functions of multiplicity and centrality. The results show that all observables exhibit the expected dependence on event activity, including smooth multiplicity scaling, mass ordering in $⟨p_{\mathrm{T}}⟩$, and characteristic features associated with radial flow and quark coalescence. Differences between the two configurations on bulk observables remain small across all observables, typically at the level of a 2\%--6\% percent, with slightly enhanced sensitivity observed in peripheral collisions. These findings suggest that, within the AMPT-SM framework, the collective dynamics and hadrochemical composition are primarily governed by the overall system density and interaction dynamics, while the influence of initial-state deformation is subleading. This study provides a baseline for understanding deformation effects in light-ion collision systems and highlights the limited sensitivity of bulk observables to initial nuclear geometry in transport-based approaches.

   hep-phnucl-th0 citations
8. 08*

   Chiral first order phase transition at finite baryon density and zero temperature from self-consistent pole masses in the linear sigma model with quarks

   Alejandro Ayala🇲🇽 · Bruno El-Bennich🇧🇷 · Ricardo L. S. Farias🇧🇷 · Luis A. Hernández🇲🇽 · Bruno S. Lopes🇧🇷 · Luis C. Parra L.🇲🇽 · Renato Zamora🇨🇱

   We use the two-flavor Linear Sigma Model with quarks as an effective description of QCD to investigate the nature of the chiral phase transition at finite baryon chemical potential and zero temperature. We work at one-loop order to set up and solve the system of self-consistent coupled equations for the particle pole masses. The chemical potential-dependent value of the chiral order parameter is obtained by minimizing the one-loop effective potential. This treatment goes beyond the conventional ring-diagram approximation and provides a description valid for arbitrary values of the chemical potential. We find that the phase transition is of first order, and occurs when the quark chemical potential reaches the value of the vacuum quark mass for the chosen set of parameters. The first order nature of the transition is signaled by the discontinuous behavior of the chiral condensate, the masses and the couplings. The thermodynamics of the system is readily implemented and in particular, we find that the square of the speed of sound exhibits a discontinuity at the phase transition and then smoothly approaches the conformal limit from below.

   hep-phhep-thnucl-thPRD(2026)·1 citation
9. 09*

   Target-Mass Corrections in the OPE Sum-Rule Approach to Quarkonium-Nucleon Interactions with Global-Fit PDFs: an $x$-Resolved Analysis

   Arkadiy I. Syamtomov🇺🇦

   We derive an exact all-orders treatment of target-mass corrections (TMCs) within the leading-twist Coulombic OPE for the absorptive quarkonium-nucleon spectral baseline. Resumming the complete trace series before analytic continuation yields a closed spectral kernel, a shifted-convolution expression, and a moment representation that preserves the on-shell incoming domain $0<y\le 1$, with $y=m_N/\lambda$ and $\lambda$ the nucleon energy in the quarkonium rest frame. Using native ABMP16, MSHT20, CT18, and NNPDF4.0 grids, we find at $Q=10$~GeV and ${ϵ}_0=0.16$~GeV that the TMC/no-TMC moment ratio decreases from about $0.85$ at $n=4$ to $0.42$-$0.48$ at $n=12$. At the first tabulated energies above the incoming two-body endpoint, the leading-twist cross-section ratio is strongly suppressed but rapidly approaches unity with increasing energy. The strict endpoint has an integrable inverse-velocity behaviour, whose hadronic-threshold interpretation lies outside the leading-twist construction.

   hep-phNPB(2026)·1 citation
10. 10*

    No planar degeneracy for the Landau gauge quark-gluon vertex

    Georg Wieland🇦🇹 · Reinhard Alkofer🇦🇹

    Based on a suitable basis system for the quark-gluon vertex' transverse tensor structures and on carefully chosen kinematical variables, the transverse part of the quark-gluon vertex in quenched QCD in the Landau gauge is obtained from a system of Dyson-Schwinger equations. We demonstrate by analysing this solution that the angular dependence of these transverse quark-gluon vertex form factors is seemingly weak. We nevertheless argue that this does not imply a planar degeneracy for this vertex because even this mild dependence cannot be neglected when aiming for reasonably precise results for derived quantities. Last but not least, for a self-consistently coupled systems of 3PI Dyson-Schwinger equations for the quark propagator and the quark-gluon vertex we confirm that the core ingredient to dynamical chiral symmetry breaking is the dynamically generated tensor coupling of glue to quarks which itself is only possible because of chiral symmetry breaking. Furthermore, we find (i) a relation in between the calculated chirality violating vertex form factors; (ii) that the quark propagator is identical within numerical errors when obtained either from a decoupling solution or the scaling solution for the Yang-Mills propagators and vertex functions; and (iii) that the resulting quark propagator is consistent with possessing poles only on the real time-like half-axis. Furthermore, we provide high-precision fits for the form factors based on sometimes astonishingly simple model functions.

    hep-phhep-thnucl-th2 citations
11. 11*

    When Does Leptogenesis Survive Lepton Flavor Violation Constraints? High- and Low-Scale Realizations in the Scotogenic Model

    Avinanda Chaudhuri🇮🇳

    We investigate the interplay between lepton flavor violation (LFV) and leptogenesis in the minimal scotogenic model, comparing high-scale hierarchical leptogenesis and low-scale resonant leptogenesis within a unified Casas--Ibarra framework. Since the same Yukawa couplings simultaneously govern radiative neutrino mass generation, charged LFV processes, and the CP asymmetry required for baryogenesis, strong phenomenological correlations arise. We show that high-scale leptogenesis remains naturally viable due to the effective decoupling between LFV and baryogenesis, while low-scale resonant leptogenesis is strongly constrained by the MEG bound on $\mu \to e\gamma$. Nevertheless, we identify a narrow but nonvanishing resonant window where successful baryogenesis, controlled washout, and LFV safety coexist simultaneously. In particular, we obtain fully allowed benchmark points characterized by quasi-degenerate heavy fermions, resonantly enhanced CP asymmetry, and suppressed flavor violation through Casas--Ibarra phase alignment.

    hep-ph0 citations
12. 12*

    Near-Threshold OPE Constraints and High-Energy Diffractive Dynamics in J/psi Photoproduction

    Arkadiy I. Syamtomov🇺🇦

    We study the forward $J/\psi N$ amplitude $M_{\psi N}(\lambda )$ using a leading-twist Coulombic operator-product expansion, exact physical-domain target-mass resummation, and modern gluon PDFs. Forward-intercept extrapolations reported by GlueX and CLAS12 constrain the amplitude modulus within a vector-meson-dominance normalization. After fitting an overall scale and a subtraction constant, the exact-TMC and no-TMC descriptions differ by only $\Delta {\chi }^2=0.021$, while a two-parameter empirical exponential gives an equally good fit. The point $C_{\mathrm{sub}}=0$ changes the profiled minimum by only $0.033$. Current near-threshold data therefore determine neither the target-mass correction nor the subtraction constant separately. An independent correlated fit to HERA data gives $\delta =0.695\pm 0.023$. The absence of direct-proton measurements between $W\simeq 4.73$ and $20\mathrm{GeV}$ prevents a data-driven determination of the crossover to high-energy diffraction.

    hep-phNPA(2026)·0 citations
13. 13*

    A Lightning-Fast Three-Flavor Neutrino Oscillation Calculator in Constant-Density Matter with Built-In Uncertainty Propagation

    Aaryan Chaulagain🇳🇵 · Daya Nidhi Chhatkuli🇳🇵 · Anju Dhakal🇳🇵

    Neutrino oscillation experiments are entering an era of precision, requiring both fast calculations and reliable uncertainty estimates. We present a compact three-flavor oscillation calculator for constant-density matter, built on analytic perturbative formulas and validated against established series expansions. Using the NuFIT 6.0 global-fit covariance matrix, the tool incorporates up-to-date parameter values and correlations. It accurately computes appearance and disappearance probabilities over 0.3-5 GeV at a 295 km baseline, offering two computation modes: exact Hamiltonian diagonalization for high-fidelity results, and a faster perturbative approximation that runs roughly 27x quicker. A hybrid scheme handles the MSW resonance region, combining speed with accuracy. Uncertainties can be propagated via Monte Carlo sampling or a fast linearized approach, producing reliable confidence bands. The implementation preserves unitarity, reproduces vacuum and resonance limits, and captures high-energy suppression effects. This calculator provides a fast, reliable framework for parameter scans, phenomenological studies, and sensitivity estimates for current and future long-baseline experiments like Hyper-Kamiokande and DUNE.

    hep-ph0 citations
14. 14*

    Technically Natural Suppression of Fifth Force

    Kensuke Homma🇯🇵 · Taishi Katsuragawa🇨🇳 · Shinya Matsuzaki🇨🇳

    Light scalars generically mediate a fifth force incompatible with local tests of gravity unless their couplings are parametrically suppressed or screening mechanisms are introduced. We demonstrate that such suppression can arise from symmetry. We propose a $Z_2$-symmetric mirror extension of the Standard Model within a bi-conformal gravity construction, where spontaneous breaking of scale invariance produces a light scalaron as a pseudo-Nambu-Goldstone boson. This scalaron couples to the difference of trace anomalies between the Standard Model and mirror sectors. We find a parameter-independent correlation between the fifth-force strength $\alpha$ and the scalaron mass $m_{\sigma }$, with the proportionality set by QCD observables and the electroweak scale. The Standard Model predicts $\alpha \lesssim 10^{-3}$ above 10~cm scales for $m_{\sigma }\lesssim 10^{-6}$ eV, which is directly in the target window of next-generation experiments. In contrast to environmental screening mechanisms, this suppression mechanism follows directly from symmetry rather than nonlinear scalar dynamics.

    hep-phgr-qchep-exhep-th0 citations
15. 15*

    Baryon-Meson Sum Rule for $b\to s\nu \bar{\nu }$

    Teppei Kitahara🇯🇵 · Manas Kumar Mohapatra🇮🇳 · Kota Sasaki🇯🇵

    We derive a robust sum rule among the branching fractions of ${\Lambda }_b\to \Lambda \nu \bar{\nu }$ and $B\to K^{(\ast )}\nu \bar{\nu }$, assuming that right-handed neutrinos are decoupled. Despite the presence of 18 independent Wilson coefficients in the effective Hamiltonian, this relation remains exact. Remarkably, it is found that the coefficients of this baryon-meson sum rule are numerically identical to those of the $b\to c$ semileptonic sum rule among the branching fractions of ${\Lambda }_b\to {\Lambda }_c\tau \bar{\nu }$ and $B\to D^{(\ast )}\tau \bar{\nu }$. Once the decay rate of $B\to K^{\ast }\nu \bar{\nu }$ is measured, the decay rate of ${\Lambda }_b\to \Lambda \nu \bar{\nu }$ can be determined in a model-independent manner for new-physics scenarios involving only left-handed neutrino interactions. This clearly demonstrates that observables in baryonic and mesonic $b\to s\nu \bar{\nu }$ transitions will serve as a powerful probe for discriminating among new-physics scenarios.

    hep-phhep-ex2 citations
16. 16*

    Prospects of boosted magnetic dipole inelastic fermion dark matter at ILC-BDX

    I. V. Voronchikhin🇷🇺 · D. V. Kirpichnikov🇷🇺

    In this work, we investigate the projected sensitivity of the Beam-Dump eXperiment at the International Linear Collider (ILC-BDX) to inelastic fermionic dark matter coupled to the Standard Model photon through an off-diagonal magnetic dipole operator. We compute the production rate of dark matter states in the bremsstrahlung like process $e^{-}N\to e^{-}N{\gamma }^{\ast }(\to {\chi }_1{\bar{\chi }}_0)$, induced by the scattering of high-energy electrons on target nuclei. The resulting boosted dark matter fluxes are then propagated to the detector, where the signal events arise from scattering off detector electrons or monophoton decay of heavier state. The projected exclusion limits are derived using the expected numbers of electrons on target (this implies a typical rate of $4.0\times 10^{21}/\text{mbox}year$) corresponding to 1 year and 10 years of data taking. To characterize the impact of inelasticity, we consider two benchmark relative mass splittings, $\Delta =0.05$ and $\Delta =0.001$, motivated by thermal dark matter scenarios. Our results show that ILC-BDX can probe inelastic magnetic-dipole dark matter over a phenomenologically viable region of parameter space.

    hep-ph1 citation
17. 17*

    QCD sum rule analysis of local meson-meson currents for the $K(1690)$ state

    Yi-Qi Mu🇨🇳 · Peng-Wen Xu🇨🇳 · Si-Tong Chen🇨🇳 · Yi-Tong Wei🇨🇳 · Ge-Jia Zhang🇨🇳 · Bing-Dong Wan🇨🇳

    The nature of the recently observed $K(1690)$ state, reported by the COMPASS Collaboration as a candidate strange crypto-exotic meson with $J^P=0^{-}$, remains unclear. In this work, we investigate whether it can be described by local meson-meson currents within the framework of QCD sum rules. We construct a set of independent local color-singlet meson-meson interpolating currents with $J^P=0^{-}$ and analyze their QCD sum rules. For the currents that admit reliable Borel windows, the extracted effective mass scales are consistently in the range of $2.0$--$2.3\mathrm{GeV}$, significantly above the experimental mass of the $K(1690)$. Within the standard pole-plus-continuum framework, none of the selected local currents yields a separately resolved low-lying pole compatible with the COMPASS signal. These results indicate that the selected local color-singlet meson-meson currents do not isolate the $K(1690)$ signal within the present framework, while leaving open the possibility of more extended molecular dynamics and other configurations beyond the present analysis.

    hep-ph3 citations
18. 18*

    Reconstructing the Invisible Fraction of Semi-visible Jets in ISR-Boosted Events via Neural Network Regression

    Yin Li · Bingxuan Liu🇨🇳 · Jianbin Wang🇺🇸 · Jiaqi Xie · Kairong Xu🇩🇪 · Ruihan Ye · Zihuan Huang

    Semi-visible jets (SVJs) provide a characteristic collider signature of strongly interacting dark sectors, in which the key model parameter $r_{\mathrm{inv}}$ controls the fraction of dark hadrons decaying to dark matter candidates. In this work, a regression model is developed to reconstruct $r_{\mathrm{inv}}$ in SVJ events produced in association with an energetic photon. The model uses information from high-level physics objects only, and the training procedure is optimized to ensure applicability. The performance is found to be robust against varying signal parameters and $r_{\mathrm{inv}}$ can be reconstructed at a much higher precision, compared to previously developed analytical method. It offers a new approach to conduct SVJ searches that can potentially unify both $s$-channel and $t$-channel productions, enhancing the sensitivities.

    hep-phhep-ex0 citations
19. 19*

    Dilaton-Induced Resonant Production of Ultralight Vector Dark Matter

    Imtiaz Khan🇨🇳 · G. Mustafa🇨🇳 · Jehanzad Zafar🇨🇳 · Farruh Atamurotov🇺🇿 · Ahmadjon Abdujabbarov🇨🇳 · Chengxun Yuan🇨🇳

    A dilatonic half-mass resonance can produce ultralight vector dark matter only if the Floquet instability becomes efficient before the oscillating spectator scalar dominates the cosmic expansion. We formulate this requirement in terms of the microscopic modulation parameter ${ϵ}_i={\Phi }_i/M$ and the gravitational onset fraction $r_i={\Phi }_i^2/(6{\text{Mpl}}^2)$. For a background with constant equation-of-state parameter $w_b$, the narrow-band Floquet exponent obeys $\mu /H\propto a^{3w_b/2}$; during radiation domination this ratio grows as $a^{1/2}$, while it remains constant for matter-like expansion. Imposing that the delayed instability occurs before spectator domination yields the amplitude-independent bound $M/\text{Mpl}\lesssim \sqrt{6},c_1\simeq 0.31$, with $c_1\simeq 1/8$ determined by the linear half-mass branch. An explicit expanding-background analysis confirms that $a_{\star }<a_{\mathrm{dom}}$ for sub-Planckian $M$, whereas $M\simeq \text{Mpl}$ postpones efficient growth until after domination. Combining this embedding condition with the efficient-transfer normalization gives $m_{{\gamma }^{\prime }}\propto r_i^{-2}$, implying that the ultralight range $m_{{\gamma }^{\prime }}\sim 10^{-20}$--$10^{-18},\mathrm{eV}$ corresponds to $r_i\sim 10^{-5}$--$10^{-4}$ rather than to early spectator domination. The polarization-resolved canonical analysis shows that longitudinal production is more strongly concentrated in the infrared than transverse production, while derivative terms from canonical normalization modify the leading Floquet exponents at order unity. Stückelberg and Higgsed completions impose distinct ultraviolet consistency conditions, including radial decoupling and symmetry-restoration constraints. The viable branch is therefore radiation-era, perturbative, infrared-dominated, and associated with a sub-Planckian kinetic scale.

    hep-ph2 citations
20. 20*

    Flavon assisted low scale leptogenesis

    Yan Shao🇨🇳 · Zhen-hua Zhao🇨🇳

    Low-scale leptogenesis scenarios, such as the resonant or ARS leptogenesis, typically require a highly degenerate mass spectrum of right-handed neutrinos (RHNs). This requirement can be circumvented by extending the seesaw framework with a scalar singlet $S$ that couples to RHNs via the $S{N}_I^{}{N}_J^{}$ terms (with $I\ne J$), which opens up new decay channels $N_I^{}\to N_J^{}S$ and provides additional sources of CP violation, thereby enabling successful leptogenesis at the TeV scale without the need for mass degeneracy. In this work, we point out that the flavon fields, which are introduced in many flavor-symmetry neutrino mass models to be responsible for the generation of RHN masses through the acquisition of non-zero vacuum expectation values, serve as ideal candidates for the $S$ field. Taking as an example a flavor-symmetry neutrino mass model that naturally realizes the experimentally allowed TM1 mixing pattern and has the attractive features that only one flavon field plays the role of $S$ and that it couples to only two RHNs, we demonstrate that the observed neutrino masses and mixing angles can be consistently reproduced, while the observed baryon asymmetry can be achieved within a parameter space compatible with current experimental constraints.

    hep-ph1 citation
21. 21*

    $P_{c\bar{c}s}(4459{)}^0$, $P_{c\bar{c}s}(4338{)}^0$ and mass spectrum of strange hidden-charm pentaquarks

    Zhe-Hao Cao🇨🇳 · Zhi-Yuan Chen🇨🇳 · You-You Lin🇨🇳 · Ji-Ying Wang🇨🇳 · Ailin Zhang🇨🇳

    Strange hidden-charm pentaquark states have been systematically investigated within a diquark-triquark model. Through a Gaussian expansion method, masses of some diquarks, triquarks and strange hidden-charmed pentaquark states from S-wave to P-wave excitations have been calculated with the non-relativistic Semay and Silvestre-Brac potentials in terms of the same parameters employed for tetraquark states. Masses of pentaquark states in S-wave excitations are found between $4200$ MeV and $4590$ MeV, while masses of all P-wave excitations are found above $4600$ MeV. Mass splittings between the S-wave and P-wave pentaquark states are about $350-570$ MeV. In comparison to the experimental data, $P_{c\bar{c}s}(4459{)}^0$ observed by LHCb in decay channel ${\Xi }_b^{-}\to J/\psi \Lambda K^{-}$ is assumed as the $|1;0,1/2;3/2,0{⟩}_{3/2}$ $[sq][\bar{c}cq]$ pentaquark state with $J^P={\frac{3}{2}}^{-}$, while $P_{c\bar{c}s}(4338{)}^0$ observed in the decay channel $B^{-}\to J/\psi \Lambda \bar{p}$ is very possibly the $|0;1,1/2;1/2,0{⟩}_{1/2}$ $[cq][\bar{c}sq]$ pentaquark state with $J^P={\frac{1}{2}}^{-}$. We predict a lowest strange hidden-charm pentaquark state with $J^P={\frac{1}{2}}^{-}$ around $4200$ MeV.

    hep-ph0 citations
22. 22*

    Search for Axion Like Particles produced via the Primakoff process at COMPASS

    Mehran Dehpour🇨🇿

    Axion-Like Particles (ALPs) are well-motivated candidates for dark matter and potential mediators to the dark sector. We present a search for ALPs coupled to photons, based on a reinterpretation of COMPASS data. Using the 2009 dataset consisting of $190\text{GeV}$ ${\pi }^{-}$ and ${\mu }^{-}$ beams impinging on a fixed nickel target, we investigate the Primakoff production of ALPs. Due to the high beam energy, ALPs in the MeV mass range are produced with a significant Lorentz boost, leading to strongly collimated decay photons. Consequently, these photons are not spatially resolved by the electromagnetic calorimeter and are instead reconstructed as a single merged cluster. This signature mimics the single-photon signal of Standard Model Primakoff Compton scattering, which was the primary focus of the original COMPASS analysis. By quantifying this potential ALP contamination in the Compton scattering sample, we derive exclusion limits on the ALP-photon coupling $g_{a\gamma \gamma }$ in the mass range $0.2\lesssim m_a\lesssim 600\text{MeV}$. Our results exclude couplings $g_{a\gamma \gamma }\gtrsim 10^{-1}{\text{GeV}}^{-1}$ at 95% C.L., providing independent constraints on the parameter space that bridges beam dump experiments and high energy colliders. While current collider-based limits remain more stringent, this work establishes a novel reinterpretation framework and provides a baseline for future studies of resolved diphoton states in complementary kinematic regimes, such as Primakoff ${\pi }^0$ production.

    hep-phhep-exEPJC(2026)·0 citations
23. 23*

    Spontaneous Baryogenesis from Axions on Induced Electroweak Walls

    Miguel Vanvlasselaer🇪🇸 · Wen Yin🇯🇵

    We propose a baryogenesis mechanism in which an electroweak phase boundary is induced by a wall-like configuration of a scalar field, such as a domain wall or a shock wave, coupled to the Higgs field. If the Higgs mass parameter depends on the scalar field value, the wall locally separates the electroweak-symmetric and broken phases, thereby providing an induced electroweak wall. We focus on the case where the scalar field is an axion-like particle coupled to the SU(2) Chern--Simons density. The motion of the wall then generates a local effective chemical potential for B+L, realizing a spontaneous baryogenesis mechanism. In the presence of unsuppressed sphaleron transitions in front of the wall, this biases the plasma and leads to baryon asymmetry generation. We discuss the parametric conditions for the induced wall, cosmological realizations based on domain walls and shock waves, and the associated implications for baryon inhomogeneities and gravitational waves. The axion coupling is predicted to be sufficiently weak to evade current experimental and observational bounds.

    hep-phastro-ph.CO5 citations
24. 24*

    Primordial Magnetogenesis and Gravitational Waves from ALP-assisted Phase Transition

    Pankaj Borah🇮🇳 · P. S. Bhupal Dev🇺🇸 · Anish Ghoshal🇬🇧

    Sufficiently strong first-order phase transitions (FOPTs) in the early Universe can simultaneously produce an observable stochastic gravitational wave background (SGWB) and a large-scale primordial magnetic field (PMF). The recent $3.8\sigma$ evidence for a non-zero intergalactic magnetic field from anisotropic pair-halo searches using \textit{Fermi}-LAT data further motivates a cosmological origin. We investigate an FOPT-origin of both cosmic signatures, namely, PMF and SGWB, and their correlation, within a minimal axion-like particle (ALP) framework in which a global $U(1)$ symmetry is spontaneously broken through radiative corrections, with the ALP sector coupled to the Standard Model (SM) via a Higgs-portal. We compute the present-day PMF amplitude and coherence length for both maximally helical and non-helical configurations, accounting for inverse cascade effects. For maximally helical configurations, we find peak field strengths up to $B_0\sim 10^{-9}$ G at coherence length ${\lambda }_0\sim 10^{-3}-10^{-1}$ Mpc, consistent with lower bounds on the IGMF inferred from blazar observations by MAGIC, H.E.S.S. and {\it Fermi}-LAT. We show that the ALP parameter region consistent with $\gamma$-ray blazar data (assuming maximally helical fields) simultaneously produces stochastic GW signals detectable at future space-based interferometers, such as LISA, etc., over the ALP decay constant range $10^3\text{GeV}\lesssim f_a\lesssim 10^5\text{GeV}$. We demonstrate that these correlated constraints can be directly mapped onto effective ALP couplings to SM particles, e.g., photons, gluons, and fermions. This establishes a multi-messenger complementarity between cosmological observables and laboratory/astrophysical ALP searches, with combined constraints preferring relatively heavy ALPs, $m_a\gtrsim 0.1\text{GeV}$, accessible to next-generation intensity and energy-frontier experiments.

    hep-phastro-ph.COhep-th1 citation
25. 25*

    Probing QCD instantons using jet correlation observables in proton-proton collisions at the LHC

    Sayak Guin🇮🇳 · Swagatam Tah🇮🇳 · Nihar Ranjan Sahoo🇮🇳 · Sayantan Sharma🇮🇳

    Discovery of instantons in colliders will provide experimental evidence for the topological properties of the QCD vacuum. In this work, we propose jet correlation observables that can unambiguously discriminate between instanton-induced processes and perturbative hard scattering events in pp collisions at LHC energies. By calculating the instanton sizes and their separations in 2+1 flavor QCD with physical quark masses, we provide constraints on the center-of-mass energies of the produced hadrons in an instanton-induced process. Our proposal is directly applicable for future ep measurements at the Electron-Ion Collider, offering a cleaner environment to probe instanton-induced processes.

    hep-phhep-exhep-latnucl-ex+1PLB(2026)·1 citation
26. 26*

    Irreducible Gravitational Wave Background as a Particle Detector

    Anish Ghoshal🇬🇧 · Angus Spalding🇬🇧 · Graham White🇬🇧

    Beyond the standard model particles can imprint a temporary early matter-dominated epoch on a stochastic gravitational-wave background. For a freely propagating background whose production has ceased, we show that the resulting feature contains two characteristic frequencies that determine the particle decay rate $\Gamma$ and the abundance-weighted mass $Y_{i}M$, independently of the microphysical origin of the gravitational-wave source. Using numerical scans, we derive semi-analytic relations between these characteristic frequencies and the BSM particle parameters, and quantify the parameter ranges over which these relations remain valid. For backgrounds that remain actively sourced, the end of early matter domination continues to define a source-independent cosmological frequency scale controlled by $\Gamma$, although the second feature, and hence the inference of $Y_{i}M$, is source dependent. Once a particle model and production mechanism are specified, the measured combinations can be translated into masses and microscopic couplings. Remarkably, decay lengths targeted by upcoming long-lived-particle searches map directly onto the nanohertz range in which NANOGrav has reported evidence for a stochastic gravitational-wave background.

    hep-phastro-ph.CO4 citations
27. 27*

    Sharpening New Physics Searches in Neutrino Oscillations with DUNE-PRISM

    Josu Hernández-García🇪🇸 · Jacobo López-Pavón🇪🇸 · Salvador Urrea🇫🇷

    Upcoming long-baseline neutrino oscillation experiments such as DUNE aim to achieve unprecedented precision, but their physics reach is ultimately constrained by systematic uncertainties in neutrino flux predictions and neutrino-nucleus cross sections. These limitations are especially critical for new-physics searches in neutrino oscillations at the near detector, including non-unitarity and sterile neutrinos, where the signal manifests as small distortions in the energy spectrum and is therefore highly sensitive to spectral uncertainties. The PRISM (Precision Reaction Independent Spectrum Measurement) technique offers a robust strategy to mitigate these effects by exploiting measurements at multiple off-axis angles, effectively providing a data-driven handle to reduce systematics. In this work, we demonstrate that PRISM can significantly reduce the impact of large systematic uncertainties, restoring sensitivity to non-unitarity and sterile neutrino scenarios in the electron and muon sectors to a level comparable to that obtained with small spectral uncertainties. We also include the results for the $\tau$ sector with PRISM; however, in this case, since the majority of the flux measured at off-axis angles lies below the $\tau$ production threshold, we find the improvement to be marginal. As part of this work, we have obtained neutrino and antineutrino fluxes for different off-axis angles with higher statistics than those provided by the DUNE collaboration. We make available these fluxes as auxiliary material to this manuscript.

    hep-phhep-ex1 citation
28. 28*

    Improving the robustness of the ${\delta }_{CP}$ determination with $\nu$SCOPE

    João Paulo Pinheiro🇨🇳 · Salvador Urrea🇫🇷

    The determination of leptonic CP violation is a primary goal of future long-baseline neutrino experiments such as DUNE and T2HK. The extraction of ${\delta }_{\mathrm{CP}}$ relies on the near-to-far extrapolation and on the assumed knowledge of the cross-section ratios ${\sigma }_{{\nu }_e}/{\sigma }_{{\nu }_{\mu }}$ and ${\sigma }_{{\bar{\nu }}_e}/{\sigma }_{{\bar{\nu }}_{\mu }}$, which are typically inferred under theoretical assumptions such as lepton universality and depend on nuclear modeling. In this work, we quantify how much of the sensitivity of DUNE and T2HK arises from these assumptions by performing a model-agnostic, data-driven estimation of systematic uncertainties in ${\nu }_e$ and ${\bar{\nu }}_e$ cross sections. We find that adopting such an agnostic approach can substantially degrade the CP-violation sensitivity, reducing it by nearly $3\sigma$ at maximal CP violation for DUNE, and $4\sigma$ for T2HK. We then assess the impact of the proposed $\nu$SCOPE experiment, which, through a combination of neutrino tagging and the Narrow-Band Off-Axis technique, can provide percent-level measurements of ${\sigma }_{{\nu }_{\mu }}$ and ${\sigma }_{{\bar{\nu }}_{\mu }}$ and constrain the ratio ${\sigma }_{{\nu }_e}/{\sigma }_{{\nu }_{\mu }}$ at the $\sim 2\%$ level. We show that including prospective $\nu$SCOPE measurements largely restores the lost sensitivity, highlighting that precise external cross-section measurements may be essential for a fully robust determination of ${\delta }_{\mathrm{CP}}$ and for breaking its degeneracy with nuclear mis-modeling or possible new physics affecting neutrino detection.

    hep-phhep-ex1 citation
29. 29*

    Kitchen Sink Anomaly Detection

    Ranit Das🇺🇸 · Marie Hein🇩🇪 · Gregor Kasieczka🇩🇪 · Michael Krämer🇩🇪 · Lukas Lang🇩🇪 · Radha Mastandrea🇺🇸 · Louis Moureaux🇩🇪 · Alexander Mück🇩🇪 · David Shih🇺🇸

    An enormous amount of R&D effort has resulted in many new resonant anomaly detection methods being proposed in recent years. However, the vast majority of previous R&D studies have suffered from two limitations: they have focused on a very small set of simulated signal benchmark models; and they have either used small sets of carefully crafted high-level jet substructure observables, which can be highly performant but are prone to model dependence, or the full collider event phase space, which is more agnostic but suffers from reduced sensitivity. In this work, we address both limitations: we formulate a number of new simulated signal benchmarks, which we make publicly available in a format fully compatible with the LHCO R&D benchmark; and we explore a high-level, yet highly agnostic, observable set consisting of Energy Flow Polynomials in addition to the usual subjettiness variables. We evaluate this "kitchen sink" observable set for both an idealized anomaly detector and the CWoLa hunting task, along with three baseline observable sets (the Baseline LHC Olympics set, subjettiness observables, and Energy Flow Polynomials). We find that our kitchen sink approach is the most sensitive to a broad range of signal types. Furthermore, we show that an attribute bagging variant, in which each ensemble member is trained on a random subset of substructure observables, yields comparable anomaly detection performance while significantly reducing training cost.

    hep-phhep-exphysics.data-an4 citations
30. 30*

    Nuclear geometry driven symmetry plane correlations in OO and Ne--Ne collisions at the Large Hadron Collider

    Suraj Prasad🇭🇺 · Raghunath Sahoo🇮🇳

    Symmetry-plane correlations (SPCs) are key observables sensitive to the medium's transport properties and are driven by participant-plane correlations (PPCs) in the nuclear overlap region. This study explores the possibility of nuclear-geometry-driven SPCs in Oxygen--Oxygen (OO) and Neon--Neon (Ne--Ne) collisions at $\sqrt{s_{\mathrm{NN}}}=5.36$ TeV using nuclear geometry simulations based on Nuclear Lattice Effective Field Theory (NLEFT) and Projected Generator Coordinate Method (PGCM) configurations. We investigate $⟨\cos [4({\psi }_2-{\psi }_4)]{⟩}_{\mathrm{GE}}$ and $⟨\cos [6({\psi }_3-{\psi }_6)]{⟩}_{\mathrm{GE}}$ in OO and Ne--Ne collisions at $\sqrt{s_{\mathrm{NN}}}=5.36$ TeV using the A Multi-Phase Transport (AMPT) model. We find that Ne--Ne collisions exhibit larger $⟨\cos [4({\psi }_2-{\psi }_4)]{⟩}_{\mathrm{GE}}$ values than OO collisions, whereas $⟨\cos [6({\psi }_3-{\psi }_6)]{⟩}_{\mathrm{GE}}$ is larger in OO than in Ne--Ne collisions. This behavior indicates a strongly deformed shape of the ${}^{20}$Ne nucleus and a tetrahedral structure of the ${}^{16}$O nucleus. We also explore SPCs for events with tip-tip and body-body collision configurations, which further support these findings.

    hep-phhep-exhep-thnucl-ex+11 citation
31. 31*

    Prospects for measuring exclusive diffractive $\eta ,{\eta }^{\prime }$ at the LHC

    Rainer Schicker🇩🇪

    Central exclusive diffractive production in proton-proton collisions at hadron colliders is characterised by hadronic activity at or close to midrapidity, and by the two forward scattered protons, or their remnants. In such events, no particles are produced between the midrapidity system and the forward beam particles. These events can hence be identified with appropriately placed detectors for measuring the forward scattered protons, or their remnants, and a detector system covering the midrapidity range. At the energies of the LHC, central diffractive production in proton-proton collisions is dominated by pomeron-pomeron fusion. The description of the pomeron within the Regge approach is summarized, and the feasibility of identifying pseudoscalar mesons $\eta ,{\eta }^{\prime }$ in pomeron-pomeron fusion is studied for determining the spin structure of the pomeron.

    ↳ hep-exhep-phPoS(2026)·0 citations
32. 32*

    Unraveling Chemical Enrichment in Extreme Emission-Line Galaxies: A Multi-Element Bayesian View of Bursty Star Formation and Galaxy Evolution in DESI

    Razieh Emami · James A. A. Trussler · Tiger Yu-Yang Hsiao · Kaley Brauer · Lars Hernquist🇺🇸 · Randall Smith · Douglas Finkbeiner · Fengwu Sun🇨🇳 · Rebecca Davies · James F. Steiner · Mark Vogelsberger🇺🇸 · Tobias Looser · Grant Tremblay · Letizia Bugiani

    Extreme emission-line galaxies (EELGs) probe chemical enrichment in low-mass, bursty systems where star formation, feedback, and gas accretion are poorly constrained. Using DESI DR1, we select 23 nearby EELGs with detections of 19 ionic species (S/N $\ge$ 4), stellar masses $M_{\ast }\ge 10^7{M}_{\odot }$, and extreme H$\alpha$ and [O III] 5007 equivalent widths (EW $\ge$ 500 Angstrom). We infer non-parametric star-formation histories and fit a Bayesian single-zone chemical-evolution model to O, N, Ne, S, and Ar, allowing time-dependent star-formation efficiency, outflow mass loading, and evolving inflow metallicity. We find short depletion timescales and large mass-loading factors, indicating rapid gas cycling in a burst-driven, non-equilibrium regime, with depletion times below Kennicutt-Schmidt expectations. Star-formation efficiency and outflows are well constrained, while inflow metallicity is weaker due to degeneracies with metal production. Abundance ratios isolate physical drivers: star-formation efficiency sets evolutionary tracks, outflows regulate metal retention and X/O normalization, and inflow metallicity sets baseline enrichment. N/O strongly constrains burst timing and gas flows, Ne/O remains nearly invariant, and S/O and Ar/O show intermediate sensitivity. These results demonstrate that multi-element abundances provide a direct probe of baryon-cycle processes in extreme low-mass starbursts.

    ↳ astro-ph.GAastro-ph.COastro-ph.SRhep-ph0 citations
33. 33*

    Purely quadratic non-Gaussianity from tachyonic instability: Primordial black holes and scalar-induced gravitational waves

    He-Xu Zhang🇨🇳 · Mei Huang🇨🇳

    We investigate primordial black hole (PBH) formation in a cosmological scenario where curvature perturbations follow purely quadratic non-Gaussianity, $\zeta =A({\varphi }^2-langle{\varphi }^2⟩)$, arising from tachyonic instability in multicomponent inflationary models. Within an extended Press-Schechter framework based on the compaction function, we derive the probability distribution of the linear compaction function and its asymptotic exponential tail, demonstrating that the PBH abundance is exponentially sensitive not only to the amplitude of perturbations but also to the correlation coefficient $\rho$ between the smoothed field and its radial gradient. We further find that, in this tachyonic amplification scenario, the spectral width of the curvature power spectrum plays a decisive role in avoiding PBH overproduction: broad spectra yield mildly negative $\rho$ and fail to suppress PBH formation, while sufficiently narrow spectra drive $\rho \to -1$, resulting in exponential suppression while maintaining a sizable gravitational-wave signal. Thermal inflation serves as a benchmark for asteroid-mass PBH dark matter and high-frequency scalar-induced gravitational waves potentially detectable by future space-based interferometers, but its typically broad spectra make it challenging to reconcile pulsar timing array observations with PBH constraints.

    ↳ astro-ph.COgr-qchep-phPRD(2026)·3 citations
34. 34*

    A Poincaré-covariant study of strange quark stars

    Hao-Ran Zhang🇨🇳 · Bo-Lin Li🇨🇳 · Zhu-Fang Cui🇨🇳

    We investigate the properties of dense quark matter and strange quark stars within a nonperturbative, Poincaré-covariant framework. Employing a symmetry-preserving vector$\otimes$vector contact interaction model, we extend the quark gap equation to the regime of zero temperature and finite quark chemical potential. From the resulting momentum-independent quark propagator, we construct the equation of state (EOS) and solve the Tolman-Oppenheimer-Volkoff (TOV) equations to evaluate the mass-radius relations and tidal deformabilities of strange quark stars. We systematically analyze the sensitivity of the EOS and the macroscopic stellar properties to the model parameters, specifically the effective interaction strength and the ultraviolet cutoff. We demonstrate that reducing the coupling constant stiffens the EOS, whereas increasing the ultraviolet cutoff softens it. By confronting our predictions with multi-messenger astrophysical constraints-including pulsar mass measurements and gravitational-wave data-we identify parameter regimes that successfully describe current observations. Specifically, we find that parameter sets with ${\alpha }_{ir}=0.735\pi$, ${\Lambda }_{uv}=0.905\mathrm{GeV}$ and ${\alpha }_{ir}=0.588\pi$, ${\Lambda }_{uv}=0.9955\mathrm{GeV}$, alongside a vacuum bag pressure of $B\approx (0.106\mathrm{GeV}{)}^4$, yield stellar properties in excellent agreement with empirical constraints.

    ↳ nucl-thhep-ph0 citations
35. 35*

    The phase diagram of confining holographic theories on constant curvature manifolds in the presence of a $\theta$-angle

    Ahmad Ghodsi🇮🇷 · Elias Kiritsis🇫🇷 · Francesco Nitti🇫🇷

    Large families of confining holographic QFTs, described by Einstein-Dilaton gravity, are considered on constant-curvature manifolds in the presence of a $\theta$-angle. The space of ground states of such theories is explored as a function of the UV parameters, namely the dimensionless curvature and the $\theta$ angle. The free energy is computed, and the phase structure is determined. For constant negative curvature manifolds, we find solutions dual to single QFTs as well as solutions describing interfaces. The single QFTs exhibit an infinite family of saddle points, with the leading one dominating the gravitational path integral and no phase transitions present. For constant positive curvature manifolds, like de Sitter, the ($\theta$-angle, curvature) phase diagram exhibits both first and second order phase transitions, as a function of the class of theories considered. We also show that when $\theta =0$, a holographic Vafa-Witten-like theorem can be proven.

    ↳ hep-thgr-qchep-phJHEP(2026)·4 citations
36. 36*

    Heavy quark thermodynamics with anisotropic lattices

    Jon-Ivar Skullerud🇮🇪 · Rachel Horohan D'Arcy🇮🇪 · Gert Aarts🇬🇧 · Chris Allton🇬🇧 · M. Naeem Anwar🇬🇧 · Timothy J. Burns🇬🇧 · Ben Page🇬🇧 · Ryan Bignell🇮🇪 · Sinéad M. Ryan🇮🇪 · Benjamin Jäger🇩🇰 · Seyong Kim🇰🇷 · Maria Paola Lombardo🇮🇹 · Alexander Rothkopf🇰🇷 · Antonio Smecca🇬🇧

    We present recent results from the FASTSUM collaboration, using anisotropic lattice QCD to study spectral properties of heavy quarkonia and open heavy flavour systems at high temperature. For heavy quarkonium, our results using a number of different methods suggest a small but significant and robust negative mass shift as well as an increasing thermal width. We present the first lattice results for masses and spectral functions of B mesons at high temperature, and preliminary results for a high-precision calculation of the static quark potential.

    ↳ hep-lathep-phActa Phys.Polon.Supp.(2026)·3 citations
37. 37*

    Charged-Current Neutrino-Induced Single-Pion Production in the Superscaling Approach and Relativistic Distorted-Wave Impulse Approximation

    Jesus Gonzalez-Rosa🇪🇸 · Alexis Nikolakopoulos🇺🇸 · Maria B. Barbaro🇮🇹 · Juan A. Caballero🇪🇸 · Raúl González-Jiménez🇪🇸 · Guillermo D. Megias🇪🇸

    In this work, we present a detailed comparison of the SuSAv2 (SuperScaling Approach version 2) and RDWIA (Relativistic Distorted-Wave Impulse Approximation) models with measurements of charged-current neutrino-induced single-pion production from different experiments (T2K, MINERvA and MiniBooNE), studying the differences between the two theoretical descriptions. The neutrino energy range in these experiments spans from hundreds of MeV to roughly 20 GeV, and the nuclear targets are mainly composed of ${}^{12}$C. The SuSAv2 model uses the single-nucleon inelastic structure functions from the ANL-Osaka DCC model, which allows for a separation of pion production channels, distinguishing between the ${\pi }^{+}$, ${\pi }^{-}$ and ${\pi }^0$ final states. In the RDWIA approach, the Hybrid model developed by the Ghent group is used for the description of the boson-pion-nucleon vertex.

    ↳ nucl-thhep-exhep-phhep-thUniverse(2026)·1 citation
38. 38*

    SubTropica

    Mathieu Giroux🇺🇸 · Sebastian Mizera🇺🇸 · Giulio Salvatori🇺🇸

    We present SubTropica, a Mathematica package that performs symbolic integration of multi-polylogarithmic integrals using recent advances in tropical geometry. It focuses on the class of linearly-reducible Euler integrals, such as Feynman integrals, and expands them using a tropical subtraction scheme. The engine behind it is HyperIntica, a native Mathematica package for hyperlogarithm integration that can be used independently. This paper documents both packages and illustrates their usage on examples from across different physics applications. Additionally, we introduce an AI-driven library of Feynman integrals, which catalogs diagrams discussed in the literature and serves as a database for computed results. Its online version is available at: https://subtropi.ca and features a graphical user interface for diagram input and retrieval of records.

    ↳ hep-thhep-ph5 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.