Full NLO QCD+EW corrections now automated for arbitrary SM processes
The upgrade makes mixed QCD and electroweak corrections a standard, user-level step in collider simulations.
hep-ex
High Energy Physics - Experiment
Results from high-energy/particle physics experiments and prospects for future experimental results, including tests of the standard model, measurements of standard model parameters, searches for physics beyond the standard model, and astroparticle physics experimental results. Does not include: detectors and instrumentation nor analysis methods to conduct experiments.
sort pith recommended most recent
First proton directed-flow measurement from Xe+Cs at 3.8 AGeV
New NICA data match JAM and extend equation-of-state tests to a new system.
· “Analysis Note: Directed flow v₁ of protons in the Xe+Cs(I) collisions at 3.8 AGeV”
First fully corrected energy correlator spans collinear to back-to-back QCD
Using archived ALEPH data, the strong force now has a single measurement reaching the back-to-back limit.
Zc(3900) pole position decides if DDD* is bound
Measure the Zc(3900) pole: it tells whether the three-hadron DDD* state is bound or not.
· “Constraining the DDD^* three-body bound state via the Z_c(3900) pole”
One in 1.4 trillion J/psi decays may create true muonium
The predicted rate is too small for today's data, but a super tau-charm factory could catch a few events per year.
Neutrino charge hunt reaches 10^-22 with split laser arms
A Mach-Zehnder interferometer with one arm underground would reveal a phase shift if relic neutrinos carry charge.
· “Probing Terrestrial Relic Neutrino Charge with Mach-Zehnder Interferometer”
A modest laser sends 10-megawatt terahertz pulses down a wire
A 3 mJ subrelativistic pulse makes single-cycle THz surface waves at 2.4% conversion, the highest reported.
· “Efficiently Laser Driven Terahertz Surface Plasmon Polaritons on Long Metal Wire”
40 to 60 degrees is where LGAD gain suppression peaks
Measured with MeV protons across 50, 100, and 150 µm sensors; suppression grows with bias voltage.
· “Measured gain suppression in FBK LGADs with different active thicknesses”
Y(10753) is a threshold bump
Bottomonium masses, decay widths, and the 10.71 GeV bump all fall out of one quark model with meson-pair loops.
Millicharge limits fall 10,000-fold when electron scattering is fitted
Including neutrino-electron scattering in the CONUS+ fit sets the tightest light-scalar limit above 6 MeV
· “Probing Standard Model and Beyond with Reactor CEνNS Data of CONUS+ experiment”
First prediction of muon-containing tetralepton states
A QED Coulomb calculation predicts bound and resonant states from −30 to −1 eV, a clean analog of tetraquark physics.
· “Trilepton and tetralepton bound and resonant states: the QED counterpart of multiquark states”
Quark model predicts exotic tetraquarks near 7.1 GeV
New narrow states with forbidden quantum numbers could appear in J/ψ pair data; X(6400) and X(6600) remain unexplained.
· “Fully charmed P-wave tetraquark resonant states in the quark model”
Rare B decay angles show up to 6.4σ deviation from standard model
B0→K*0μ+μ− is loop-suppressed, so P2 and P5' tensions could signal new particles.
Quantum tech takes on dark matter
A review maps four ways quantum information science could meet particle physics' biggest open problems.
Double-beta decay amplitude predicted at next-to-leading order
First uncertainty-quantified EFT value for the elementary decay process could shrink nuclear matrix element errors.
· “Next-to-leading-order prediction for the neutrinoless double-beta decay”
A QCD calculation matches LHCb on B_c to χ_c2 and χ_c1 pion ratios
It also predicts near-unity polarization and a χ_c0 ratio open to future data.
· “Study of B_c to chi_(cJ)\ (P, V) decays in the improved perturbative QCD formalism”
Radial-flow fits get a hotter freeze-out from v0(pT)
Blast-wave model with flow and temperature fluctuations explains the new v0(pT) data and yields hotter freeze-out than pT-spectra fits.
· “Study of p_T-differential radial flow in blast-wave model”
3.4 trillion J/psi decays put hyperon CP tests at 10^-4
The same runs would sharpen tau and charm CP searches and improve kaon CPT limits tenfold.
Neural nets beat standard fits for quark momentum shapes
A 42-parameter network cuts reduced chi-square from 1.28 to 0.97 on Drell-Yan data, a first for TMD extraction.
· “A Neural-Network Extraction of Unpolarised Transverse-Momentum-Dependent Distributions”
Reactor neutrinos set tightest limit on electron neutrino millicharge
Low-threshold germanium detectors turn reactor neutrinos into a precision electroweak probe.
· “Reactor antineutrinos CEνNS on germanium: CONUS+ and TEXONO as a new gateway to SM and BSM physics”
One rescaling factor maps any two-scalar model to LHC limits
A single six b-jet analysis, rescaled once, constrains any model with two narrow heavy scalars.
· “Triple Higgs Boson Production with Two Heavy Scalars at the LHC via a Simplified Approach”
Yttrium-doped BaF2 crystal times particles to 82 ps
Large 200-mm scintillator keeps its fast component while suppressing the slow one, promising sub-100 ps detectors.
· “Scintillation and Timing Performance of a 3at% Yttrium-Doped Barium Fluoride Crystal”
Twist-3 framework captures all vector-meson helicity states
Shockwave-based amplitudes include transversely polarized meson production at small x, with no endpoint singularities.
· “Exclusive leptoproduction of a light vector meson at the twist-3 in a GTMD framework”
Lepton ratios put alpha_em precision below 1e-5 at Tera-Z
Comparing forward electrons with muons and positrons reaches 0.6e-5 statistical sensitivity at the Z pole.
Chiral dynamics still underpins low-energy QCD
A status review shows pion-pion, nuclear, and Big Bang results all still need the chiral QCD framework.
Triplet-plus-fermion dark matter hums at LISA
A singlet fermion rescues the sub-TeV triplet window and drives the strong transition whose GW signal passes SNR>10 at future space…
· “Prospecting bipartite Dark Matter through Gravitational Waves”
A 365 GeV pseudoscalar Higgs leaves a fourfold interference signature
Mass-window and energy-scaling ratios separate a heavy pseudoscalar from toponium.
· “Contrasting Pseudoscalar Higgs and Toponium States at the LHC and Beyond”
Rare two-pion decay yields 126 events
Branching fraction of B0→π0π0 measured to (1.25±0.23)×10⁻⁶, tightening the CKM angle φ2 constraint.
Tracking that scales with hit count
A trained Hough-style algorithm treats arrival time as a coordinate and fits particle mass directly.
· “A space-time tracking algorithm for high occupancy events at future colliders”
MuSIC could beat current limits in four new-physics searches
A TeV muon beam on heavy ions reaches leptoquarks, Z' bosons, ALPs, and sterile neutrinos beyond today's experiments.
· “New Physics at the Muon (Synchrotron) Ion Collider: MuSIC for several scales”
Subleading corrections shift B→K* form factors by 30%
New power corrections are as big as the NLL terms, tightening SM rare-decay rates to ~10%.
Glass-fiber cryostat cools axion prototype below 10 K
Flowing helium gas keeps a MADMAX booster cold for 29 hours in a 1.6 T field, enabling a first dark-matter search.
· “Non-magnetic glass-fiber cryostat for MADMAX prototype tests”
Hadron-decaying vector cancels its own muon g-2 signal
In the data-driven (g-2) test, a vector that decays to hadrons leaves almost no trace; the lattice-vs-dispersion HVP test takes over.
· “Searching for hadronic scale baryonic and dark forces at (g-2)_μ's lattice-vs-dispersion front”
Boron cosmic rays harden at 182 GeV/n
Eight years of DAMPE data show a secondary cosmic-ray break twice as strong as in protons and helium.
· “Observation of a spectral hardening in cosmic ray boron spectrum with the DAMPE space mission”
Timelike hyperon form factors: theory fits
Review says final-state interactions set threshold shapes and vector-meson models set the continuum; the open problems are experimental.
· “Electromagnetic form factors of hyperons in the timelike region: A short review”
Anomaly-scan finds no new dijet resonances in CMS data
ML anomaly scans of 138 fb-1 of 13 TeV data find no bumps; several benchmark limits are firsts.
Neighboring hadron pairs inherit spin correlation from QCD evolution
Even starting from zero, the correlation builds up and can expose the longitudinal spin transfer G1L.
Heat kernel turns thermal effective action into Polyakov-loop sums
Systematic dimension-six thermal effective actions now include Polyakov-loop effects to all orders.
0.0013–1.9 kg-years of exposure can pin an LDMX excess as dark matter
A silicon detector needs only that much exposure to cross-check a fixed-target dark matter hint.
GERDA sees no neutrinoless double-beta decay in 82.4 kg·yr
Half-life limit tops 10^26 years, making GERDA the first search to reach that sensitivity.
LHC observation of eta mesons would rule out a scalar pomeron
Tensor-pomeron model predicts up to 2.5 microbarns for pp→pp eta and 0.3–0.7 for eta' at 13 TeV.
First precise rates for rho0-plus-dimuon coincidences match LHC data
A percent-level coincident background is now calculable, and its ZDC and kinematic dependence matches measurement.
· “Modelling Coincident Particle Production in Ultraperipheral Heavy Ion Collisions”
Curved silicon sensors cut FCC-ee vertex detector material by 3x
Thinner inner layers improve impact-parameter resolution, opening rare B-decay measurements at the proposed collider.
· “Design, performance and future prospects of vertex detectors at the FCC-ee”
MilliQan null search tightens limits on millicharged particles
Zero clean candidates in 124.7 fb^-1 of 13.6 TeV proton collisions set the strongest bounds yet for charges below 0.24e.
· “Search for millicharged particles in proton-proton collisions at sqrt{s} = 13.6 TeV”
W boson mass now matches Standard Model
LHC+Tevatron average gives 80361±8 MeV, matching the Standard Model; CDF's 80433 MeV is the lone outlier.
· “Status of the W boson mass and the future of the electroweak fit in the next decades”
Nova reaction rate climbs 23% after underground re-measurement
Two low-energy resonances measure 1.5x stronger, lifting the 21Ne(p,γ)22Na rate in the nova range.
· “Improved direct measurement of low-energy resonances in the ²¹Ne(p,γ)²²Na reaction”
Q-ball collapse seeds tiny black holes and nHz gravitational waves
Boson bubbles collapsing to ~10^15 g black holes would ring in nHz gravitational waves and glow in gamma rays.
· “Primordial black holes from Q-balls produced in a first-order phase transition”
Non-coherent dark matter still rings a resonant cavity at full power
Conversion power tracks average energy density, not phase coherence, so resonant-cavity search formulas stand either way.
· “Classical Analysis of Non-Coherent Dark Matter to Photon Conversion in a Resonant Cavity”
Deep-UV asymptotics fix six flavors and the full QCD coupling
The same boundary condition predicts the Z-pole coupling at 0.1161 and matches data from 1 GeV to multi-TeV.
· “Asymptotic gauge symmetry and UV extension of the nonperturbative coupling in holographic QCD”
Hadron energy-energy correlator solved analytically at leading order
Gluon scattering decomposes into celestial blocks, linking collinear, Sudakov, and Regge regimes in one formula.
· “Energy-Energy Correlator at Hadron Colliders: Celestial Blocks and Singularities”
First NLL' resummation of a transverse one-jettiness
It joins N3LL qT resummation to power NNLO+PS Higgs generators from beauty and charm quark pairs.
· “Resumming transverse observables for NNLO+PS matching in GENEVA”
Sapphire detector study finds stronger light-mediator limits
One year of reactor antineutrinos would also gauge the weak mixing angle to ~7% and probe neutrino magnetic moments at 10⁻¹¹ μ_B.
Normalising flows can shrink physics likelihoods to checked files
A trained flow passes a joint-distribution test and packs a likelihood into a few megabytes, easing reuse.
Precision W-boson cross sections match theory to sub-1% level
New low-pile-up ATLAS data at 5.02 and 13 TeV also cut valence-quark PDF uncertainties by half.
Off-shell nucleon recipes shift neutrino rates by up to 10%
DUNE's few-percent error budget cannot absorb the 2–10% spread among standard off-shell treatments.
Top Yukawa measurable to ~1% via WW scattering at muon collider
Selecting helicities of the top pair and Z in W W scattering yields a percent-level Yukawa bound without a shape analysis.
· “Measuring Top Yukawa Coupling through 2rightarrow 3 VBS at Muon Collider”
Cone-shaped GEM hole cuts ion backflow and boosts gain
Simulations show a single conical hole with thicker lower copper improves detector gain and durability.
· “Dynamics of Hot QCD Matter 2024 -- New facilities and instrumentation”
Reweighting cuts negative MC event weights by 99.97%
In NLO e+e− → q qbar + 1 jet generation the sign problem nearly vanishes while visible distributions stay unchanged.
Bhabha scattering can produce nearly maximally entangled free pairs
A two-stage scattering scheme turns the hidden spin correlation into a measurable 1.29 angular ratio.
· “Testing spooky action between free-traveling electron-positron pairs”
1950: Wu's experiment made the first entangled photons
A reanalysis credits Chien-Shiung Wu with the first controlled quantum entanglement, ahead of later Bell tests.
· “Chien-Shiung Wu as the experimental pioneer in quantum entanglement: a 2022 note”
g_A lands on experiment: 1.250(24) from physical-point QCD
No chiral extrapolation needed: sigma_piN = 41.9(8.1) MeV and tensor/scalar charges follow from three physical-mass ensembles.
· “Nucleon axial, tensor, and scalar charges and σ-terms in lattice QCD”
Segmented GAGG detector splits solar neutrino double pulses
Prototype segments hit 6.57% energy resolution at 662 keV and clock 57Co's 98.47 ns double-pulse delay.
NA62 beam-dump search sees zero hadronic dark-sector decays
Seven final states, from ππ to KKπ0, close new windows on dark photons, dark scalars, and axions.
· “Search for hadronic decays of feebly-interacting particles at NA62”
Radon in XENONnT drops to 0.90 µBq/kg
Cryogenic distillation cuts radon backgrounds down to the solar neutrino floor for the first time.
· “Radon Removal in XENONnT down to the Solar Neutrino Level”
FCC-ee vertexing: only MAPS sensors can meet the spec
If right, the next electron-positron collider's tracker R&D must focus on monolithic pixel sensors.
X-ray dose cuts CMOS pixel threshold
Threshold falls after $10^4$ Gy but noise holds steady, easing calibration of future trackers
KM3NeT's first tau-neutrino measurement tightens unitarity bound
Counting 92 tau-neutrino events sets the tau-row unitarity bound at alpha33 > 0.95.
Detector concept keeps 10 TeV muon physics above 95% efficiency
Simulated beam background barely dents central-region reconstruction of tracks, photons, and neutrons.
Tiny levitated spheres could spot dark matter at 85 eV
Optical traps with 15-nm SiO2 spheres may reach couplings beyond SNO and SN1987A limits.
· “Probing Light Particles With Optically Trapped Sensors Through Nucleon Scattering”
Ion source control moves to EPICS Linux by renaming FPGA registers
The FPGA logic stays untouched, so existing ion-source behavior carries into a full Linux EPICS environment.
· “RIO EPICS device support application case study on an ion source control system (ISHP)”
Four-body VBS probes Higgs self-couplings at 10x lower scales
If the paper is right, 2-to-4 signals outgrow 2-to-3 ones at a few TeV, within future collider reach.
One formula predicts when dual-readout calorimeters help
The dual-readout correction helps only if electromagnetic-fraction fluctuation beats Cherenkov noise
One code now automates NLO QCD for proton-nucleus collisions
Extension of MadGraph5_aMC@NLO validates on pPb W/Z and pion-tungsten Drell-Yan, with automatic uncertainties.
· “Automated NLO calculations for asymmetric hadron-hadron collisions in MadGraph5_aMC@NLO”
Single-photon detector chip reaches 72.5% fill factor
Daisy-chained chips form ~70%-fill-factor planes for liquid noble gas experiments with 10-ns photon timing.
Quantum-dot color layers read shower depth in one crystal
If the simulation holds, four thin quantum-dot sheets give a single crystal the depth resolution of a segmented calorimeter.
Generative unfolding now measures the top mass without training bias
Batch-level mass conditioning and mixed-mass training let unfolded top decays reveal the true top mass.
10-year neutrino run tests 72% of CP-violation phase at 5σ
The proposed ESS experiment would measure the CP-violating phase to better than 8 degrees for any true value.
New b-jet triggers record 50% more Higgs-pair events
Run 3 trigger upgrades keep rates flat while catching about 1.5 times as many HH→bbbb and HH→bbττ decays.
Realistic πK interactions shrink femtoscopy radii
A dispersive πK amplitude plus relativity fits ALICE data with 3 parameters and returns source radii of 0.35–0.67 fm
ORCA6 data put first bound on invisible neutrino decay
433 kiloton-years of atmospheric neutrinos hold the decay parameter to a 2.1-sigma window around the Standard Model.
· “Probing invisible neutrino decay with the first six detection units of KM3NeT/ORCA”