HEP Phenomenology·hep-ph

Mon·Sep 7, 2026Monday·September 7, 2026

28 papers—25 primary·3 cross-listed

01
Dark matter glueball candidate from a $G (2)$ -- $E_{6}$ -- $E_{7}$ exceptional grand unified theory: $G$ -parity, spin, mass and stability
Nicolo' Masi🇮🇹
We determine the gauge-invariant identity, mass scale and ultraviolet stability of the dark matter candidate arising from $G(2)\to SU(3)_C$ in the exceptional $G(2)\!-\!E_6\!-\!E_7$ construction. The broken $G(2)$ sector contains odd $1^{+-}$ and $0^{--}$ channels, whereas the scalar $0^{++}\sim X\bar X$ state is even and unprotected. For $m_X\simeq5.7\times10^{13}\,\mathrm{GeV}$, weak-binding reference masses are $M_{2X}\simeq1.14\times10^{14}\,\mathrm{GeV}$ and $M_{3X}\simeq1.71\times10^{14}\,\mathrm{GeV}$, while the exact pole masses remain nonperturbative. Gauge-invariant Fröhlich--Morchio--Strocchi (FMS) operators, Hall--Post bounds, $Y$-junction arguments and the pure-$SU(3)$ glue spectrum favor $1^{+-}$ in their controlled regimes without excluding a deeply bound $0^{--}$ state. We then test whether this dark grading survives the full chiral exceptional embedding. An on-shell analysis finds no independent purely dark odd operator through dimension seven: the first nonvanishing basis appears at dimension nine. So the minimal one-copy exceptional embedding does not provide an exact ultraviolet dark $G$-parity. Moving the dark Higgs from the common $\mathbf{1463}_H$ parent to a separated $\mathbf{1539}_H$ removes the scalar-parent obstruction and the relevant dimension-nine exceptional parents vanish on the selected pure-dark component in the undressed limit. A genuinely gauged or geometric $\mathbb Z_{2,D}$ would therefore leave a bosonic parity after dark Higgsing. Its extension to the mirror-free theory nevertheless fails because the required $G(2)$ conjugation also conjugates color, $\mathbf3_C\leftrightarrow\bar{\mathbf3}_C$. The remaining obstruction to exact dark matter stability is therefore ultraviolet and chiral, rather than low-energy or purely scalar.
hep-phhep-th0 citations
02
Hadronization effects and electroweak contributions in DIS one-jettiness
Radja Boughezal🇺🇸 · Haotian Cao🇺🇸 · Zhong-Bo Kang🇺🇸 · Xiaohui Liu🇨🇳 · Sonny Mantry🇺🇸 · Frank Petriello🇺🇸
We study the structure of leading hadronization effects and the contributions of massive electroweak gauge boson exchange in the $τ_{1}$ and $τ_{1 a}$ 1-Jettiness global event shapes for deep inelastic scattering (DIS). The leading hadronization effects in $τ_{1}$ acquire a non-trivial dependence on the hard scattering kinematics. This kinematic dependence is explicitly calculable, so that the leading hadronization effects in $τ_{1}$ , $τ_{1 a}$ , and DIS thrust are universal and described by the same underlying shape function. The additional calculable kinematic dependence in $τ_{1}$ provides an independent lever arm for simultaneously constraining hadronization effects in these observables. We present corresponding results at the N $^{3}$ LL+ $O (α_{s}^{2})$ level of accuracy. We extend previous results by including the contributions mediated by the exchange of the massive $Z$ and $W$ electroweak gauge bosons for neutral current (NC) and charged current (CC) DIS, respectively, including $O (α_{s})$ QCD corrections to obtain N $^{2}$ LL+ $O (α_{s})$ results. We compare theoretical predictions to Pythia simulation and demonstrate the universality of leading hadronization effects across NC and CC DIS processes and a wide range of kinematics relevant to HERA and the EIC.
hep-phnucl-th0 citations
03
Probing $ν$ SMEFT at Belle II with displaced dilepton vertices
Patrick D. Bolton🇸🇮 · Fabian Esser🇨🇿 · Lukáš Gráf🇨🇿 · Juraj Klarić🇭🇷 · Suchita Kulkarni🇦🇹 · Abner Soffer🇮🇱
The existence of right-handed (RH) neutrinos is strongly motivated by the observation of small neutrino masses and as a means to shed light on the origin of parity violation in the Standard Model (SM). Experimental searches for the corresponding mass eigenstates, referred to as heavy neutral leptons (HNLs), have been carried out in a variety of experiments and within different HNL models. In the current work we use the SM effective field theory with added RH neutrinos, known as $ν$ SMEFT, to study GeV-scale HNL production in $e^{+} e^{-}$ collisions at the Belle~II experiment. We focus on leptonic decays of long-lived HNLs that produce a displaced vertex in the Belle~II detector. Accounting for detection efficiency and backgrounds, we estimate the sensitivity of Belle~II to the new-physics scale of four-fermion, Higgs-current, and dipole operators in $ν$ SMEFT. We find that for most operators, the search we propose probes large regions of parameter space that are not excluded by other searches.
hep-phhep-ex0 citations
04
Reinterpreting Supersymmetry
Igor Salom🇷🇸
The mathematically elegant and promising idea of supersymmetry faces severe challenges as its conventional weak-scale realizations are increasingly constrained by the lack of experimental evidence of superpartners. However, we point out that the prediction of new (seemingly non-existing) supersymmetric particles is not a necessity: if we slightly relax our expectations from the supersymmetric models, generators $Q_{α}^{a}$ of $N$ -extended supersymmetry can be readily interpreted as carrying a quantum number of the internal gauge group, thus connecting particles with different gauge properties. In this view, operators $Q_{α}^{a}$ remain ``square roots'' of translations, but do not by themselves generate symmetries of the model. They merely represent transformations that mathematically relate bosonic and fermionic fields; it is only the gauge-invariant combinations of the form $\sum_{a} {Q_{α}^{a}, Q ˉ_{a β}}$ that correspond to spacetime momenta and thus represent symmetries of the model. With this conceptual modification, the simplest Yang-Mills supersymmetric model no longer connects vector bosons with hypothetical gauginos, but with far less exotic chiral fermions, e.g.\ with left-handed leptons. Further adding an $S U (2)$ doublet of Higgs scalars no longer introduces Higgsinos, but a fermion that naturally corresponds to the right-handed lepton, with the familiar Yukawa term showing up as a mathematical necessity. Despite giving up the requirement that operators $Q_{α}^{a}$ alone generate symmetries of the action, this approach to supersymmetry is strikingly mathematically similar to standard SUSY, raising hopes that many of the favorable properties of standard supersymmetry can be retained, while potentially reconciling the idea of supersymmetry with experimental data. The approach is still quite restrictive: the relative coefficients of such models are strongly determined.
hep-phhep-th0 citations
05
Quantum Graph Neural Networks for Jet Tagging on Quantum Hardware
Benjamin Jobilal🇺🇸 · Jinghong Yang🇺🇸 · Trevor Smith🇺🇸 · Vincent Calvo🇺🇸 · Zhong-Bo Kang🇺🇸 · Shabnam Jabeen🇺🇸
Jets are central to the physics programs of both current and future colliders, from precision Standard Model measurements and searches for new physics at the Large Hadron Collider to studies of nucleon structure at the future Electron-Ion Collider. Motivated by these applications, we explore quantum machine learning for jet classification and present a permutation-invariant Quantum Graph Neural Network (QGNN) applied to particle-cloud representations of jets. We apply the model to two such discrimination tasks: quark vs. gluon and up vs. down quark flavor tagging, with the latter being, to our knowledge, the first application of a quantum model to this problem. In the ideal simulation, the QGNN performs competitively against the Particle Flow Network and traditional QCD observables. We further deploy scaled-down models to IBM and IonQ quantum processing units (QPUs), where we train and evaluate them, obtaining promising results. Finally, we perform an interpretability analysis to characterize the observables learned by the quantum model, relating them to generalized angularities for the quark-gluon study and to jet charge for the flavor study.
hep-phhep-exquant-ph0 citations
06
Earth-scale searches for displaced vertices: KM3NeT meets the LHC
Ui Min🇯🇵 · Wen Yin🇯🇵
At high-energy colliders, enormous numbers of feebly interacting particles beyond the Standard Model can be produced with negligible missing-energy signatures in the main detectors. These particles can travel macroscopic distances and decay inside a distant large-volume detector, leaving visible signals. In this sense, we may not need new detectors to search for very long-lived particles. In this paper, we show that long-lived dark particles produced in rare meson decays in proton-proton collisions during LHC Run 3 and at the HL-LHC can leave observable imprints in KM3NeT detectors such as ORCA. If no anomalous signal has been observed in ORCA to date, our projected sensitivity for LHC Run 3 will correspond to one of the strongest limits on kaon decays into light long-lived particles.
hep-ph0 citations
07
$Z$ -plus-jet Production with JETHAD-DYnamis: Angular Structure, Polarization, Fixed-Order Matching
Francesco Giovanni Celiberto🇪🇸 · Francesca Lonigro🇪🇸
Recent NLO analyses of inclusive Higgs production indicate that high-energy resummation corrections can reach the 10\% level, highlighting the growing impact of high-energy QCD dynamics on electroweak observables from LHC to FCC energies. We extend this precision program to Drell-Yan plus jet production by deriving high-energy-resummed predictions for rapidity and transverse-momentum distributions of electroweak bosons. Fixed-order NLO accuracy is consistently combined with next-to-leading energy-logarithmic resummation (NLL/NLO). We outline a JETHAD-DYnamis-POWHEG matching strategy that retains polarization and angular correlations while enabling realistic lepton-level kinematics. This setup provides the first high-energy-resummed description of rapidity-separated electroweak-boson plus jet final states. The resulting framework offers a precision-oriented description of Drell-Yan observables for present LHC measurements and the High-Luminosity LHC, where percent-level theoretical control will become increasingly important.
hep-phhep-ex0 citations
08
Cosmological moduli problem ameliorated by decaying WIMPs
Howard Baer🇺🇸 · Vernon Barger🇺🇸 · Robert Wiley Deal🇺🇸
We investigate the cosmological moduli problem (CMP) in the context of supersymmetric models where discrete R-symmetries are used to suppress the mu term, and where mu is regenerated via Kim--Nilles superpotential operators. In such theories, a global U(1)_{PQ} emerges as an accidental, approximate symmetry which solves the strong CP problem. R-parity is also generated as accidental but approximate, where RPV operators gain a (f_a/m_P)^n suppression. When n=1, the thermally-produced LSPs may decay before BBN in the early universe, leaving axion-only dark matter of the SUSY DFSZ type. Meanwhile, the dominant cosmological constraint on light stringy moduli previously came from the modulus-induced WIMP overproduction problem. WIMP overproduction is now ameliorated by the RPV WIMP decays, but the moduli-induced BBN bound may be exacerbated by convolving long-lived modulus decay with long-lived RPV WIMP decay: long-lived particle (LLP) cascade decays. In this context, moduli as light as m_\phi ~ 130 TeV may be allowed which can reconcile naturalness with the presence of stringy moduli in the early universe.
hep-ph0 citations
09
Stability of Collective Neutrino Oscillations -- A Distributional Approach
Rupak Majumder🇮🇳 · Dwaipayan Mukherjee🇮🇳 · Shamik Gupta🇮🇳 · Basudeb Dasgupta🇮🇳
We study the stability of collective neutrino oscillations using a distributional approach motivated by the statistical mechanics of Kuramoto synchronization. Treating the ensemble of neutrino flavor polarization vectors in the thermodynamic limit $N \to \infty$ , we derive an exact nonlinear Fokker--Planck (continuity) equation for the one-body distribution $F (S, ω, t)$ on the flavor sphere. This equation admits a two-parameter family of azimuthally symmetric stationary solutions, whose stability we analyze by linearizing around them. The resulting eigenvalue condition determines the growth or decay rate of small perturbations from \emph{any} initial distribution -- not merely from a state close to full flavor coherence -- thereby going significantly beyond the conventional linear stability analysis of collective modes. In special limits the condition reproduces known synchronization thresholds in the two-beam model, providing a non-trivial check of the framework. We present analytical results for the eigenvalue equation and explore stability phase diagrams for physically relevant frequency distributions.
hep-phastro-ph.SRcond-mat.stat-mechnlin.AO0 citations
10
Systematic study of baryon-baryon interactions in singly bottomed systems
Yuxuan Du🇨🇳 · Yanyue Pan🇨🇳 · Xinmei Zhu🇨🇳 · Zhiyun Tan🇨🇳 · Hongxia Huang🇨🇳 · Jialun Ping🇨🇳
In this work, we systematically investigate the baryon-baryon interactions in singly bottomed dibaryon systems within the chiral quark model and search for possible bound states. By exploring the baryon-baryon interaction, we find that low-isospin channels tend to generate deeper attractive interactions and are prone to form bound states. We also find that decuplet-decuplet systems tend to show stronger attraction and support a larger number of bound states, whereas octet-octet systems generally exhibit weaker attraction and fewer bound solutions. The binding behavior of octet-decuplet systems generall lies between these two cases. Several bound states are obtained, which are $Δ Σ_{b}^{*}$ with $I J = \frac{1}{2} 0$ , $\frac{1}{2} 1$ , $\frac{1}{2} 2$ , $\frac{1}{2} 3$ , and $\frac{3}{2} 3$ , the $Δ Σ_{b}$ with $I J = \frac{1}{2} 1$ , $\frac{1}{2} 2$ , $\frac{3}{2} 1$ , and $\frac{3}{2} 2$ , the $N Σ_{b}^{*}$ with $I J = \frac{1}{2} 2$ , the $Σ Σ_{b}$ with $I J = 00$ , $01$ , and $11$ , the $Σ Σ_{b}^{*}$ with $I J = 01$ and $02$ , the $Σ^{*} Σ_{b}$ with $I J = 01$ and $02$ , and the $Σ^{*} Σ_{b}^{*}$ with $I J = 00$ , $01$ , $02$ , $03$ , and $13$ . Further investigations of the corresponding scattering processes are still required to determine whether these bound-state candidates can be identified. These states deserve further experimental investigation.
hep-phhep-exhep-latnucl-th0 citations
11
Scalar propagator in a rotating thermal medium: Consistency checks and applications
Luis A. Hernández🇲🇽 · R. Zamora🇨🇱
We derive the scalar propagator in a thermal medium under global rotation without restricting the spacetime points to a common comoving trajectory. The resulting propagator retains an explicit dependence on the radial coordinates, reflecting the lack of translational invariance in the transverse plane, and therefore cannot in general be formulated solely in momentum space. We show that the usual free Feynman propagator is exactly recovered in the nonrotating limit, providing a first consistency check of the formulation. As a nontrivial test, we apply the propagator to the interacting $λ ϕ^{4}$ theory at finite temperature and rotation. The one-loop scalar self-energy obtained within the Matsubara formalism correctly separates into vacuum and medium contributions and reproduces the standard finite-temperature result when $Ω \to 0$ . We subsequently construct the effective potential including screening effects through ring resummation and, for $Ω/ T ≪ 1$ , evaluate the rotational corrections up to $O (Ω^{4})$ . Within this model, the resulting effective potential exhibits the expected thermal restoration of the spontaneously broken $Z_{2}$ symmetry, while global rotation favors symmetry restoration and enhances this effect as the transverse size of the system increases. These results provide complementary consistency checks of the rotating scalar propagator and highlight the need to retain its explicit position-space structure in more general perturbative calculations.
hep-phhep-th0 citations
12
QCD sum rule analysis of hidden strange $1^{++}$ tetraquark masses and radial excitations
Zhuo-Ran Huang🇨🇳 · Wei Chen🇨🇳 · Jason Ho🇺🇸 · Lei-Hua Liu🇨🇳
We revisit the light tetraquark states with quantum numbers $J^{P C} = 1^{++}$ using QCD sum rules, focusing on a complete set of derivative-free diquark-antidiquark interpolating currents. By calculating the operator product expansion up to dimension-eight condensates, we extract the ground-state mass of the hidden-strange $u s u ˉ s ˉ$ tetraquark from both Laplace sum rules (LSR) and finite-energy sum rules (FESR). Our combined analysis yields $M_{u s u ˉ s ˉ} = 1.45 \pm 0.11$ ~GeV, which agrees well with the mass of the $a_{1} (1420)$ resonance and supports its tetraquark interpretation. Furthermore, we perform Gaussian sum rule (GSR) analyses to probe radial excitations, adopting a two-resonance narrow-width model. The GSR fit reveals a heavier state with mass $m_{2} = 1.86 \pm 0.12$ ~GeV and a relative coupling $r = 0.15 \pm 0.03$ for the lighter state, indicating that the $a_{1} (1930)$ is a promising candidate for a compact $1^{++}$ tetraquark. We also discuss the dominant decay modes of these tetraquark candidates, emphasizing hidden-strange channels such as $K^{*} K$ and $f_{0} (980) π$ , which can be tested in future experiments.
hep-ph0 citations
13
Self-Interacting Sterile Neutrino Cold Dark Matter: Resonant Production Mechanism in the Early Universe
Eung Jin Chun🇰🇷 · Kenji Kadota🇨🇳 · Seokhoon Yun🇰🇷
Sterile neutrinos are well-motivated dark matter candidates, but their conventional production through active-sterile mixing is tightly constrained by X-ray searches and structure-formation observations. We propose a distinct production mechanism operating entirely within a sterile sector: two sterile neutrinos, $N_{1}$ and $N_{2}$ , coupled to a singlet scalar $ϕ$ , with $N_{1}$ the dark matter candidate and $N_{2}$ held in equilibrium through frequent scattering induced by its scalar interaction. Thermal self-energies induced by the $N_{2}$ and $ϕ$ backgrounds generate both a temperature-dependent mass splitting and an off-diagonal mixing between $N_{1}$ and $N_{2}$ . As the Universe cools, the in-medium levels can undergo a level crossing, leading to resonantly enhanced conversion of the thermal $N_{2}$ population into $N_{1}$ . We formulate the conversion using a density-matrix kinetic equation that consistently incorporates coherent $N_{1}$ - $N_{2}$ conversion, collisional decoherence, and thermal repopulation of $N_{2}$ . For a narrow resonance, the integrated conversion probability admits a simple analytic form that coincides with the Landau-Zener result, despite the underlying collisionally damped dynamics. In the weak-conversion regime relevant for freeze-in, this correspondence provides a robust analytic description of the resonant production. We derive the resulting dark matter abundance and identify the conditions for cosmological stability of $N_{1}$ and for resonant conversion to dominate over direct scattering and decay production. The resulting relic abundance scales as $Y_{1} \propto g_{12}^{2} g_{22} M_{Pl} / m_{1}$ , making the dark matter energy density approximately independent of $m_{1}$ . This mechanism provides a new route to sterile-neutrino dark matter that does not require appreciable active-sterile mixing.
hep-ph0 citations
14
Exothermic and Endothermic Inelastic Dark Matter Interpretations at LZ: Sideband Constraints and Future Prospects
James B. Dent🇺🇸 · Jayden L. Newstead🇦🇺
The LZ experiment has extended its nuclear-recoil search to 270 keV and reports a single nuclear-recoil-like event, LZ230616, at $\sim 250$ keV, in a region with negligible expected background. We show that exothermic inelastic dark matter, in which the ambient dark state down-scatters and releases its mass splitting $∣ δ ∣$ as recoil energy, can naturally produce a recoil peak at this energy while remaining consistent with the null result at lower energies. Our simple fit leaves the mass unconstrained, because a heavy candidate can hide its peak above the LZ region-of-interest. However, we show that the empty high-energy sideband, which LZ uses for background validation, disfavors broadly peaked spectra. For an exothermic explanation, the sharper peaks produced by lighter dark matter with larger mass splittings are therefore preferred. Realizing this scenario requires cosmologically stable states and a leptophobic mediator. Normalizing to the one observed event, we predict $≃ 4.5$ signal events in LZ's projected 1000 live-day exposure, and show that existing XENONnT and PandaX-4T data could already test the interpretation in an extended analysis window.
hep-ph5 citations
15
Flavor Tomography of Long-Lived Neutrino-Mass Mediators: Probing the Neutrino Mass Ordering at the HL-LHC
Renjie Wang🇨🇳
The neutrino mass ordering remains unresolved because long-baseline oscillation measurements are entangled with the unknown CP phase $δ_{C P}$ ; a collider probe free of this degeneracy would provide a qualitatively different, complementary test. We show that when the long-lived charged particle producing a displaced-lepton signal at the High-Luminosity LHC is also the mediator responsible for Majorana neutrino masses---the \textit{shared-coupling condition}---the Casas--Ibarra parametrization determines the lepton flavor ratio $N_{e} / N_{μ}$ of time-delayed leptons in terms of Pontecorvo--Maki--Nakagawa--Sakata (PMNS) mixing parameters alone. Within the resulting \textit{shared-coupling class} of models the ratio is fixed by oscillation data, independent of all beyond-Standard-Model mass and coupling parameters up to calculable corrections bounded by charged-lepton-flavor-violation data, yielding $N_{e} / N_{μ} = 0.140$ for the Normal and $2.11$ for the Inverted Hierarchy---a separation of more than an order of magnitude between the two predictions. This prediction holds identically across the Scotogenic model, the Type-III seesaw, the inverse and linear seesaw, and lepton-portal dark matter, and is stable against oscillation-parameter uncertainties and detector-efficiency variations, which cancel in the ratio. A single efficiency-corrected decision criterion identifies the hierarchy, and explicit signal-yield estimates combined with an exact Poisson test show that $O (25)$ displaced-lepton events suffice for a $3 σ$ discrimination with the timing infrastructure already under construction at CMS and ATLAS---so that a positive long-lived-particle signal would simultaneously resolve the mass ordering, with no dependence on $δ_{C P}$ .
hep-phhep-ex0 citations
16
Higgs Boson Pair Production via Gluon Fusion: Higher-Order Corrections and Theoretical Uncertainties
Ajjath A H🇬🇧 · Simone Alioli🇮🇹 · Emanuele Bagnaschi🇮🇹 · Arunima Bhattacharya🇪🇸 · Huan-Yu Bi🇨🇳 · Roberto Bonciani🇮🇹 · Marco Bonetti🇩🇪 · Francisco Campanario🇪🇸 · Sauro Carlotti🇩🇪 · Jamie Chang🇨🇭 · Long-Bin Chen🇨🇳 · Xuan Chen🇨🇳 and 42 other authors
In this contribution, the higher-order QCD and electroweak corrections to Standard Model Higgs boson pair production via the gluon-fusion mechanism, $g g \to hh$ , are summarized and the different sources of theoretical uncertainty are assessed. The discussion includes finite top quark mass effects, matching to parton showers, approximate NNLO and N $^{3}$ LO QCD corrections, NLO electroweak effects, and uncertainties associated with the top quark mass scheme and perturbative scale choices. In addition, we provide an updated state-of-the-art recommendation for the inclusive gluon-fusion Higgs boson pair production cross section and the corresponding Higgs boson pair invariant-mass distribution.
hep-phhep-ex0 citations
17
Di-hadron Fragmentation Functions beyond LO
Luca Polano🇮🇹 · Alessandro Bacchetta🇮🇹 · Marco Radici🇮🇹
In this talk, we discuss the extraction of Dihadron Fragmentation Functions (DiFFs) beyond leading order. In particular, we review the latest extraction by the MAP Collaboration of the Unpolarized Dihadron Fragmentation Functions (DiFFs) from a fit of the 2017 BELLE data for the inclusive $π^{+} π^{-}$ pair production within the same jet in $e^{+} e^{-}$ annihilations. This new extraction improves the perturbative QCD accuracy by including NNLO calculations, relies on Monte Carlo generators only for flavor decomposition, and complements the traditional physics-informed parametrization with a Neural Network extraction. We also discuss the setup for the extraction of the transversely polarized DiFFs, where we revisit the NLO calculation for $e^{+} e^{-}$ annihilation into a transversely polarized quark-antiquark pair, obtaining a result different from the one reported in the literature.
hep-ph0 citations
18
Global Fixed Point Potentials in the Abelian Higgs Model with $N$ flavors
Gergely Fejős🇭🇺 · Shunsuke Yabunaka🇯🇵
Existence of charged fixed points in the Abelian Higgs model with $N$ flavors in $d$ dimensions is studied using the functional renormalization group. We numerically solve the coupled fixed point equations for the scale dependent charge and the non-perturbative effective potential for the scalar field. We show that the $ϵ = 4 - d$ expansion, famously successful in theories with $O (N)$ symmetry, fails to produce reliable results when taking the $ϵ \to 1$ limit. By determining global fixed point potentials, it is shown that the critical flavor number at which charged fixed points appear, modifies significantly compared to the perturbative treatment. In $d = 3$ , signs of a richer fixed point structure with presumably multicritical fixed points are also found. Discussions include subtleties of the gauge fixing and the corresponding modified Ward-Takahashi identities, including the possibility of a nonzero dimensionless photon mass at the infrared fixed point.
hep-phcond-mat.supr-con0 citations
19
Tracing Gluon Saturation through Hadronization at EIC
Weiyao Ke🇨🇳 · Xu Liu🇨🇳 · Yu Shi🇨🇳 · Xin-Nian Wang🇨🇳 · Jian Zhou🇨🇳
Gluon saturation provides a window into the nonlinear nature of the strong interaction in nuclear matter. One direct consequence of saturation is the $k_{T}$ broadening in the final state.We investigate how hadronization reshapes conventional signatures of gluon saturation at EIC within a complete event-generator framework. To this end, we implement in eHIJING an initial-state-radiation algorithm based on nonlinear small- $x$ evolution and complete the events with beam remnants, final-state radiation, and hadronization. In our simulations, the signal of parton-level nuclear $k_{T}$ broadening is strongly diluted in both the nucleon energy correlator and leading-dihadron azimuthal decorrelation after hadronization. Global hadronic recoil, by contrast, remains sensitive to the underlying $k_{T}$ broadening. We further demonstrate that Bayesian unfolding of the global hadronic recoil provides access to the underlying hard-scattering $k_{T}$ distribution. These results establish the global hadronic recoil as a promising saturation observable at the EIC.
hep-ph0 citations
20
The axial-vector nucleon form factor in the meson dominance picture: the role triangle singularities from a dispersive view
Enrique Ruiz Arriola🇪🇸 · Pablo Sanchez-Puertas🇪🇸
The nucleon axial form factor is analyzed in terms of a dispersion relation comprising chiral perturbation theory (ChPT) and perturbative QCD (pQCD) in the low- and high-momentum regimes respectively, which implies a set of superconvergence sum rules for the $A \to N N ˉ$ spectral function. In the timelike region below the $N N ˉ$ production threshold we include the $a_{1}$ and $a_{1}^{'}$ resonances, with finite-width effects modeled through $ρ π$ and $σ π$ intermediate states. Above the $N N ˉ$ threshold, we model an infinite tower of radially excited $1^{++}$ resonances with a non-integer power fall-off, eventually matching pQCD. In this setup, we find that both the ChPT and pQCD contributions are tiny. In turn, the dominant $ρ π$ triangle provides the leading deviations from axial meson dominance. Our calculation is not a fit; it contains parameters with a priori uncertainties estimates. The axial radius is predicted to be $r_{A}^{2} = (0.28 - 0.33) fm^{2} = (0.47 - 0.57 fm)^{2}$ in agreement with recent lattice QCD results but inconsistent with the MINER $ν$ A determination. A simple semiempirical formula is provided accounting for the main physical effects.
hep-phhep-exhep-lat0 citations
21
Exothermic Dark Matter at LZ
Carlos Henrique de Lima🇨🇦
We investigate whether the high-energy nuclear recoil reported by the LUX-ZEPLIN (LZ) experiment can be explained by exothermic dark matter. We realize this framework in a minimal inelastic dark photon model and show that both freeze-out and low-reheating-temperature freeze-in cosmologies can reproduce the observed rate, with GeV-scale mediator masses and small kinetic mixing. We find that the LZ event can occur in a preferred parameter region with dark matter mass around $m_{χ} \sim 30 - 200 GeV$ , and mass splitting $δ \sim 0.5 - 1 MeV$ . The scenario is largely insensitive to halo uncertainties and has robust predictions for different targets. In particular, argon and germanium detectors are expected to observe events at energies above the current xenon window.
hep-phhep-ex5 citations
22
New measurements in leptonic kaon and pion decays: experimental and theoretical perspectives
Lukas Allwicher🇩🇪 · Stefan Alexandru Ghinescu🇷🇴 · Federico Mescia🇮🇹 · Tommaso Spadaro🇮🇹 · Lucine Tabatt🇩🇪
We study the future prospects for precision measurements of purely leptonic charged-current kaon and pion decays. In particular, we consider the single ratios $R_{K π}^{ℓ = μ, e} = Γ (K \to ℓ ν) /Γ (π \to ℓ ν)$ , for which many experimental uncertainties cancel, as well as the double ratio $R_{K π}^{e} / R_{K π}^{μ}$ , which provides a particularly sensitive probe of new physics. This study is timely in light of two converging developments. On the experimental side, a new conceptual design for a dedicated setup based on a slow-extracted proton beam and a multi-year data-taking program, is expected to achieve a precision at the $1 0^{- 4}$ level. On the theory side, recent lattice-QCD calculations have reached a comparable level of accuracy. Finally, we assess the impact of these next-generation measurements on searches for physics beyond the Standard Model and show that they can provide constraints that are either competitive with or complementary to existing bounds.
hep-phhep-ex0 citations
23
Inelastic from the Other Side: Xenon Excitation Signals in Light of the LZ High-Recoil Event
Guanhua Gu🇨🇳 · Lingfeng Li🇨🇳 · Shao-Song Tang🇨🇳 · Yongheng Xu🇨🇳
The LUX-ZEPLIN (LZ) experiment recently reported a single event consistent with a nuclear recoil of $E_{NR} \sim 248 \pm 23 (stat) \pm 23 (syst)$ ~keV in an extended-energy search. We study the accompanying inelastic-xenon channel, $χ + \Xe \to χ + \Xe^{*}$ , which provides a complementary test of DM interpretations of such high-recoil events. Using the non-relativistic effective-field-theory (NREFT) framework with shell-model nuclear-transition inputs, we compute the inelastic-xenon rates for representative scenarios including inelastic dark matter and accelerated DM populations. We also simulate their S1--S2 responses, with detector modeling validated against public LZ data. The nuclear de-excitation adds an electromagnetic component shifting the signal toward the electronic-recoil band and, in some cases, toward clustered backgrounds from isotopes. We therefore construct a schematic, physics-motivated background model and perform a simplified statistical analysis. For many benchmarks, the inelastic-xenon rate is $O (0.1)$ of the elastic rate or below, suggesting that substantially larger exposures are required before this companion channel becomes observable. Our results illustrate the importance of isotope-induced background structures in the extended-energy region and extend the phenomenology of inelastic-xenon signatures to a wider range of DM scenarios.
hep-phhep-ex5 citations
24
Chaos is Target-Blind in High-Energy QCD Evolution
Raktim Abir🇮🇳
Chaotic evolution measures how rapidly nearby configurations separate, but the existence of such rapid evolution does not by itself determine what physical information the evolution actually carries. For fixed-coupling JIMWLK evolution with fresh transverse-local, color-isotropic noise, we show that this distinction becomes exact - leading to a no go theorem. At finite rapidity step and finite transverse regulator, the exact linearized update depends on the Wilson-line background only through local adjoint rotations of fresh color-isotropic noise. Once the past is conditioned upon, these rotations leave the complete local noise measure invariant, so the tangent process has the same probability law for any target ensemble evolved with the same regulated fixed-coupling dynamics, including dilute and saturated ensembles. After the exact global color-rotation mode is removed, the reduced tangent process found to have a positive leading Lyapunov exponent which indicate chaotic evolution. Fixed-coupling JIMWLK therefor can be dynamically chaotic while its tangent-only statistics carry no information about the target ensemble. Spatially nonlocal noise however evades the argument because correlations between distinct sites leave relative Wilson lines in the conditional covariance.
hep-phhep-thmath-phmath.MP+20 citations
25
Displaced Signals from Long-lived Particles in Neutrinoless Double Beta Decay
Patrick D. Bolton🇸🇮 · Noor-Inès Boudjema🇬🇧 · Frank F. Deppisch🇬🇧 · Chandan Hati🇪🇸 · Chayan Majumdar🇨🇳
Much of the literature on neutrinoless double beta ( $0 ν β β$ ) decay with light new-physics mediators focuses on invisible missing energy. We investigate the scenario in which a massive Majoron-like particle $ϕ$ is produced on-shell during $0 ν β β$ decay and subsequently decays into visible final states after travelling a macroscopic distance. Specifically, we analyze the displaced energy deposition from $ϕ$ decays into a photon pair ( $γ γ$ ), a photon and a dark photon ( $γ γ_{D}$ ) and an electron-positron pair ( $e^{+} e^{-}$ ). We demonstrate that the displaced decays modify the expected visible energy spectra and provide novel, distinct experimental signatures at current and upcoming $0 ν β β$ experiments, with the promise of improving the sensitivity of the standard invisible Majoron searches in $0 ν β β$ decay by more than two orders of magnitude. The relevant effective couplings can naturally arise in well-motivated ultraviolet-complete scenarios that conventional $0 ν β β$ decay searches cannot probe.
hep-phhep-ex0 citations
26
Supernova microlensing as a probe of ultracompact minihalos and primordial cosmology
Djuna Croon🇬🇧 · Sergio Sevillano Muñoz🇬🇧 · Miguel Zumalacarregui🇩🇪
We propose using supernova microlensing to search for ultracompact minihalos and other extended dark structures seeded by enhanced primordial small-scale power. Unlike conventional microlensing searches, which are often optimized for primordial black holes, cosmological supernovae are sensitive to lenses with physical sizes comparable to their Einstein radii (up to $\sim pc (M /1 0^{4} M_{⊙})^{1/2}$ scale), opening a qualitatively different region of dark object parameter space. We compute the extended object detection efficiency relative to point lenses. We then show how projected limits on the abundance of ultracompact minihalos can be mapped, in benchmark formation scenarios, onto constraints on the primordial power spectrum. With the Vera C. Rubin Observatory expected to deliver an unprecedented LSST supernova sample, supernova microlensing is poised to become a timely and complementary probe of small-scale structure and the physics of the early Universe.
↳ astro-ph.COastro-ph.HEhep-ph0 citations
27
Percent-Level Prediction of the Deuteron Magnetic Polarizability
Rishi Cherukuri🇺🇸 · Jiunn-Wei Chen🇹🇼 · Xiangdong Ji🇨🇳
Working through next-to-next-to-leading order (NNLO) accuracy in pionless effective field theory, we compute the isovector magnetic-dipole contribution to the scalar deuteron magnetic polarizability. The polarizability follows from detailed balance and a dispersion integral with the two magnetic current counter-terms fixed by the thermal $n p \to d γ$ rate. The conventional $ρ$ and $Z$ expansion schemes differ by $12.3%$ at next-to-leading order but agree to $0.165%$ at NNLO, resulting an apparent scheme dependence and supplying an independent convergence diagnostic. We obtain $β_{M 0}^{(M 1_{v})} = 0.0789 \pm 0.0010 fm^{3}$ , a $1.3%$ uncertainty, compared with $4.9%$ previously.
↳ nucl-thhep-ph0 citations
28
Accessing the Wess-Zumino-Witten term using Lattice QCD
Fernando Romero-López🇨🇭 · Stephen R. Sharpe🇺🇸
The Wess-Zumino-Witten interaction in chiral perturbation theory is a manifestation of chiral anomalies. One of its consequences is the presence of a nonvanishing $K K \to π^{+} π^{0} π^{-}$ amplitude. We derive the finite-volume formalism that allows one to access this, and related, amplitudes, using the spectra of two and three particles in finite volumes, spectra that can be calculated using lattice QCD. Specifically, we present the formalism for the systems $K K + 3 π$ with $I = 0$ and $π K + π π K$ with $I = 1/2$ and $3/2$ . In addition, we determine the threshold expansions for the $2 \leftrightarrow 3$ and $3 \leftrightarrow 3$ K matrices that enter the formalism, and calculate the leading order predictions from chiral perturbation theory for the coefficients that enter these expansions.
↳ hep-lathep-phnucl-th0 citations

Affiliations

first authorsco-authorsvia INSPIRE