Forbidden decay tail: 4-23 events predicted in η→π0γγ
A nucleon-triggered boson would push rare η decays past their kinematical edge, tied to the recoil proton.
hep-ph
High Energy Physics - Phenomenology
Theoretical particle physics and its interrelation with experiment. Prediction of particle physics observables: models, effective field theories, calculation techniques. Particle physics: analysis of theory through experimental results.
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Collisions raise heavy quark energy loss by 8% in QGP
A full QCD calculation finds a moderate increase from thermal parton collisions at large velocities for typical coupling.
· “Energy Loss of a Heavy Quark in a Collisional Quark-Gluon Plasma”
LIGO rules out boson clouds around Cygnus X-1's black hole
First directed search finds no gravitational waves from ultralight vector boson clouds, excluding masses 0.85–1.59 × 10^-13 eV.
Now computed: ttW two-loop amplitudes with full top and W masses
Exact pole cancellation plus finite-field coefficients deliver the NNLO cross-section grid.
· “Two-loop QCD amplitudes for tbar{t}W production at the LHC in the leading-colour approximation”
CLFQM form factors give R(D) at 3.1 sigma below HFLAV
Tau-mode branching ratios fall short of measurements while electron and muon modes match data; 2S states yield 10^{-4} to 10^{-3} rates.
· “Semi-leptonic decays B to D^((*))(1S,2S)ell ν_(ell) within the covariant light-front approach”
New Domain Wall action yields F_K/F_π = 1.1962(34)
The ratio extracted from 30 ensembles with physical pion masses tests a low-cost chiral formulation for future precision QCD work.
· “F_K/F_π as a precision test of a new four flavor Domain Wall Fermion action”
Refined calculations lower argon neutrino absorption rates by 20%
Previous models overestimated supernova event yields in DUNE-like detectors, but the new angular distribution improves pointing prospects.
· “Continuum contribution to charged-current absorption of low-energy ν_e on ⁴⁰Ar”
Full-time integrals make correlators simpler than wavefunctions
Around every pole the first subleading Laurent term vanishes; total-energy expansions become a differential operator on amplitudes.
Bosenova hits QCD axion miniclusters above overdensity 100
Self-interactions let central axion stars grow past stability and explode within cosmic time for dense enough structures.
Lectures derive the benchmarks that guide dark matter searches
Rotation curves, relic freeze-out, and recoil rates connect in one working picture.
POWHEG method matches NLO QCD with parton showers generally
The interface is specified in both Catani-Seymour and FKS subtraction schemes and demonstrated for e+e- hadron production and Drell-Yan.
· “Matching NLO QCD computations with Parton Shower simulations: the POWHEG method”
N3LO corrections to boosted WH production reach +2%
The shift typically exceeds the NNLO scale band while shrinking residual theory uncertainty below one percent
· “Boosted Higgs-strahlung off a W boson at next-to-next-to-next-to-leading order in QCD”
Lattice QCD yields first full form factors for rare kaon decay
Physical-mass ensembles and spectral reconstruction control errors across all four lepton channels
· “Complete lattice QCD calculation of K⁻to ell⁻bar{ν}_(ell)ell^('+)ell^('-) form factors”
Helium-4 shows separate maps for quarks and gluons
Calculations using QCD factorization deliver the first 3D parton tomography of a light nucleus.
Charge and angle data alone extract the Sivers effect
The one-point charge correlator factorizes into the Sivers distribution and a perturbative jet function, eliminating fragmentation inputs.
String loops, not radiation, can park the volume modulus
NS5-brane loops absorb 97% of the energy at a tracker fixed point, gentling the modulus into its minimum.
· “Dynamics of Cosmic Superstrings and the Overshoot Problem”
Bent magnetic fields still host QCD's chiral soliton lattice
In the massless limit the pion field is the magnetic field's scalar potential; bending costs energy, not order.
This paper is the opening keynote of a 2025 history of particle physics symposium
A historical keynote recounts how the 1974 November Revolution led to the standard model of particle physics, with no new scientific…
Ghost of quadratic gravity obeys a dipole equation and is confined
If bound states form, gravity's ghost vanishes from physical amplitudes and unitarity returns.
· “Massive Ghost Confinement, Dipole Equation and Multipole States in Quadratic Gravity”
Leptonic reality makes the PMNS CP phase a calculable output
One reality condition ties neutrino CP to neutrino mass, parity breaking, and strong CP.
· “Strong CP and the PMNS Phase in Dirac Left-Right Symmetry”
Moat instabilities in dense quark matter are regulator-proof
Only divergent vacuum terms need a cutoff; with that fix, three regulator schemes agree on the phase boundaries.
Mixing pinches Ds1(2536) photon width to 0.55 keV
Two spin-state contributions cancel, explaining why Ds1(2536) to Ds gamma remains unseen.
Resonance peaks and poles obey one geometric rule
Unitarity fixes beta=alpha, predicts unknown residue phases, and extracts the Upsilon(4S) pole from its measured peak.
· “How elastic unitarity governs resonance peaks and residue phases”
A single open-source code covers the full DIS correction chain
Lecture notes trace the full chain from factorization to heavy-quark schemes into one working code, Yadism, used in real PDF fits.
Cosmic-string axions leave a sharp tail in the dark-matter spectrum
The tail yields new limits on axion mass and symmetry-breaking scale, plus a monochromatic gravitational-wave signal from cloud transitions.
· “Topics in the phenomenology of axions: the cases of cosmic strings and superradiance”
Gluon energy in proton is more compact than photon energy
QCD sum rules give gluon mass radius 1.07 fm, photon mass radius 1.33 fm
· “Photon and gluon gravitational form factors of proton in QCD”
Neural net learns pion scattering without a fixed formula
Physics constraints are imposed during training, and a new clustering step automatically drops incompatible experiments.
· “S-matrix informed neural networks for amplitude analysis”
First S-matrix-informed network extracts three pion resonance poles
The same constrained neural ensemble yields scattering lengths and Adler zeros, with uncertainties from 10,000 replicas.
Lattice QCD computes the Compton form factor directly
Bypasses the ill-posed inversion that kept lattice QCD and DVCS experiments apart.
· “Femtoscale imaging of the proton with Ioffe-time distributions”
Laguerre regulators erase the hard Higgs mass divergence
A family of zero-volume regulators turns the quadratic divergence into a soft, mass-suppressed correction.
Phantom dark energy may be a mirage of coupled dark sectors
A scalar-field model ties dark matter mass to dark energy and matches the w0-wa fit to CMB, BAO, and supernovae without a phantom field.
· “Beyond w₀-w_a and Phantom Crossing: Testing Models of Coupled Dark Sector”
Precision ion g-factors bound new scalar forces between electrons
Highly charged ions magnify short-range forces, so g-factor data can probe new scalar mediators
· “Testing New Scalar Interactions in Few-Electron Highly Charged Ions”
Deuterium-production rate pinned to 0.25–0.27%
A joint fit to thermal capture and photodisintegration data retires n+p→d+γ from the BBN error budget.
· “Deuterium Production in an Effective Field Theory Constructed from On-Shell Amplitudes”
Lattice QCD computes CP-violating pion-nucleon coupling directly
New calculation bypasses indirect chiral estimates and independently tests the neutron-proton mass-splitting relation.
· “Direct lattice QCD calculation of the θ-induced CP-violating pion-nucleon coupling”
No HL-LHC signal, no LISA hum from 2HDM transitions
Nearly every phase transition loud enough for LISA also makes an H→ZZ signal the HL-LHC can see; the reverse is not true.
· “When the HL-LHC is blind, LISA is deaf (but not vice versa): 2HDM collider-cosmology synergies”
Entropy correction shifts inflation's tilt and tensor ratio
Single-field slow-roll spectra keep their shape while amplitude, tilt, runnings, and r gain δ=ακH² terms.
· “Primordial spectra from modified Bekenstein-Hawking entropy law”
de Sitter stability depends on scalar mass
A Wilsonian flow with Hubble as the cutoff turns pure de Sitter into a saddle, while m > 0 restores an attractor.
Chiral breaking loses its grip near 7.3 flavors
Functional RG corrections make the critical gauge coupling spike, pointing to a first-order transition instead of walking.
Two-loop cancellations keep the 5D SUSY Higgs at 125 GeV
KK tower supplies the 2-6 GeV shift that reaches the 125 GeV Higgs while electroweak precision stays inside 68% CL.
· “Two-loop renormalisation and Higgs phenomenology in the five-dimensional MSSM”
Charge tweak relaxes Z' mass limit by up to 2.5 TeV
An invisible-heavy Z' cuts dilepton rates to 0.8%, and scalar channels rescue dark matter from 60 GeV to 10 TeV.
· “Generalized Chiral U(1)_(B-L): Towards a Less Constrained Z' and Dark Matter”
First NLO QCD widths for quarkonium Dalitz decays
Lepton-pair spectra distinguish J=0,1,2 states; cut dependence tests the theory.
· “Next-to-leading-order QCD corrections to S- and P-wave heavy quarkonium decay to l⁺l⁻ γ”
A single decay rate can settle X(2370)'s glueball nature
Rate depends sharply on the glueball-charmonium mixing angle, so a collider experiment can read off the state's nature.
Interference exposes tensor X(6900) in radiative charm pairs
Coherent continuum-plus-resonance sum reshapes the J/psi J/psi gamma line; eta_c eta_c gamma stays continuum-dominated.
Molecule X0 decays to rho over omega in a fixed 2.26 ratio
A cutoff-stable prediction lets experiments test the molecular nature of the 0++ partner of X(3872).
· “Radiative decays of the isoscalar S-wave Dbar D molecule”
Direct waves home in on the remnant black hole's horizon
As remnant spin varies, the signal's frequency approaches twice the horizon rotation rate from above or below.
· “Complex frequency evolution of direct waves from binary black hole mergers”
Pure qutrit rank bound caps neutrino QFI at four
Broadband spectra can restore rank, but detector response and attainable measurements decide real sensitivity.
4-b-jet scalar cascade could hit 14 sigma at HL-LHC
A W-plus-scalar channel with a lepton and four b-jets separates signal from background; the paper predicts discovery for most benchmark…
· “Search for Light Scalars in the Two Real Singlet Model at the LHC”
Tangent vectors keep measurement deltas from blocking loop reductions
Measurement deltas become spectators, so top-pair and Higgs transverse-momentum spectra reduce to master integrals.
· “Integration-by-parts identities in the presence of measurement delta functions”
Granule ripples in fuzzy dark matter shrink as 1/N with added fields
With N equal-mass components, halo density ripples drop by 1/N, yet the central core still heats stars.
· “Dynamics of Wave Structures in Multifield Fuzzy Dark Matter Halos”
Master equations alone can pick the optimal QGP observables
It finds the best thermometer and transport probes without solving the full density matrix.
· “Open Quantum Systems Approaches for Heavy-Ion Collisions”
Neural Boltzmann equations compute N_eff with no momentum grid
One conditioned training sweeps a dark-photon model over two parameters and finds m_phi in [8,13] MeV.
This paper analyzes new BESIII data on charmonium decays into pairs of cascade hyperons…
BESIII data on J/psi and psi(2S) decays into Xi Xibar pairs imply electric isospin-violating amplitudes near 10%, roughly three times the…
· “Disentangling isospin violation in charmonia decaying into Xi overline Xi pairs”
Gradient descent can now tune detector simulation cards
A differentiable Delphes-style simulator recovers 62 card parameters and beats the default card on full-sim data.
· “Differentiable Parametric Simulation and Reconstruction Models in Parnassus”
QCD sum rules set first rate for bottom-baryon to N(1520) decay
Electron and muon modes should be nearly equal at about 12 x 10^-5; tau mode about 5 x 10^-5.
· “Semileptonic Decay of Λ_b rightarrow N(1520)ell^-bar{ν}_(ell) from QCD Light-cone Sum Rules”
This paper calculates how friction on bubble walls and the shape of the bubble nucleation…
Bubble-wall friction and the nucleation-rate shape strongly alter primordial black hole mass and formation time in delayed first-order…
· “Impact of Bubble Nucleation History and Friction on Primordial Black Hole Formation”
This paper computes how the Delta(1232) particle
Including the Delta resonance in heavy-baryon chiral perturbation theory shifts QED corrections to the gA/lattice comparison toward zero…
· “Delta resonance contributions to QED radiative corrections in neutron and inverse beta decay”
This paper trains convolutional neural networks on synthetic scattering lineshapes to…
A CNN ensemble trained on synthetic uniformized S-matrix lineshapes classifies the CLAS Lambda(1405) data as globally dominated by a…
· “Revisiting the Λ(1405) pole structure with convolutional neural networks”
This paper proposes using lepton wave packets that carry orbital angular momentum (OAM)…
A localized OAM lepton wave packet provides a tunable transverse analyzer for elliptic small-x gluon tomography, producing finite-yield…
· “Orbital Angular Momentum as a Transverse Probe of Elliptic Small-x Gluon Tomography”
A unified axion framework is proposed in which a 1e-22 eV axion acts as dark matter and…
The paper argues that alignment in a multi-axion string sector can produce a transient 1e-28 eV component that reduces the sound horizon…
Nonlocal regulator makes four-loop Higgs-gluon graphs finite
Four-dimensional finite integrals replace ultraviolet subtractions for the N3LO gluon-fusion form factor.
· “On the Four-Loop Higgs--Gluon Form Factor in Nonlocal Quantum Field Theory”
Zero mode explains finite-momentum charmonium correlators in QGP
A covariant T-matrix fit at zero momentum predicts the full finite-momentum behavior seen on the lattice.
· “Charmonia at Finite Momentum and Spatial Correlators in Quark-Gluon Plasma”
Neutron EDM from QCD lattice: theta angle < 1e-11
A background-field lattice calculation extracts the neutron's theta-term dipole from local topological charge.
· “Calculation of neutron electric dipole moment from Lattice QCD”
Three technologies can measure ultra-high-energy neutrino flavors
Radio, Earth-skimming, and optical detectors together could separate all three neutrino flavors above 100 PeV.
· “Three-Technology Ultra-High-Energy Neutrino Flavor Measurement”
Resonance yields exact relic density for asymmetric dark matter
A velocity-dependent annihilation boost can match Planck relic density while nearing positron-excess limits.
· “Relic Density of Asymmetric Dark Matter with Breit-Wigner Enhancement”
Factorization reproduces three B_c decay ratios at LHCb
Computed with g = 0.30, the three ratios land at 1.70, 3.63 and 1.09 ×10⁻³, inside the new LHCb measurements.
Strong gluon fields break the naive eikonal expansion
Splitting off high-momentum modes and renormalizing color currents restores a consistent leading-order description.
· “Eikonal Expansion for Classical Gluon Fields: from Weak to Strong”
Analytic solution bridges Sudakov and BFKL gluon TMD evolution
One evolution factor reproduces both limits and puts the crossover at ξ* ≈ 0.04–0.15.
· “Analytical Solution of the Sudakov--BFKL Interpolation Equation for Small-x Gluon TMDs”
X(2370) data can't separate radial hybrid from mixed glueball
Coherent f0(980)eta, a0(980)pi, and K0*(1430) anti-K amplitudes could break the tie at chi-square about 6.5.
Scalar mechanisms in double-beta decay interfere: formula says how
The two couplings must be fit together: their interference adds one coefficient to the half-life.
· “Long-range scalar interactions in the effective field theory approach to 0νββ”
Dark Ages signal closes the cosmic-string escape hatch
The vector radiation that weakens the gravitational-wave signal would also erase the Dark Ages 21-cm absorption dip.
Cannibal self-cooling lets dark matter drop to 0.7 keV
Number-changing reactions inside the dark sector cool it down, relaxing Lyman-alpha mass limits by up to two orders of magnitude.
Particle dark matter built modern cosmology by 2000
A first-person history of the two decades that made dark matter a particle-physics problem.
Baryon density boosts the S1+iS2 condensate and suppresses the p-wave
Holographic model predicts the balanced S1=S2 phase dominates at high baryon density, relevant for neutron-star matter.
· “Holographic SU(3) color superconductivity at finite baryon chemical potential”
Two right-handed neutrinos fit neutrino data after symmetry breaking
One neutrino stays massless, RG running breaks mu-tau reflection, and observed mixing emerges with only four high-scale parameters.
· “Effects of RG running in breaking μ-τ reflection symmetry, conventional versus minimal seesaw”
Explicit relations kill all generators in two exotic 4-manifolds
The full presentations prove the reverse-engineered manifolds are simply connected and match the standard types.
ML down-quark tagging preserves top spin signal in all-hadronic pairs
A two-stage network lifts the spin-analysis factor from 0.152 to 0.255 at fixed background.
· “Down-Type Jet Identification in Fully Hadronic tbar t Events”
Six parameters reproduce every mass spectrum of a four-body charm decay
The decay's shape comes chiefly from one resonance chain: a1(1260) production, not from new meson states.
· “Theoretical description of the D⁺ to bar{K}⁰ π⁺ π⁰ π⁰ reaction”
Weak-lensing shear keeps the SIDM signal that 3D profiles lose
Baryons and projection wash out SIDM core signatures, but stacked shear still shows ~20% deviations for group-scale halos.
U(3) weak operator, not eta-prime, drives kaon axion emission
The new singlet weak term controls K→π+a rates and tightens ALP limits from rare kaon decays.
· “Axion-like particle production from kaon decays within U(3) chiral theory”
Uncertainty and entropy determine quark densities without a global fit
Its xF3 and valence ratio match standard global-fit sets and deep-inelastic data after QCD evolution.