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Event Generation with Sherpa 2.2
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Sherpa is a general-purpose Monte Carlo event generator for the simulation of particle collisions in high-energy collider experiments. We summarize essential features and improvements of the Sherpa 2.2 release series, which is heavily used for event generation in the analysis and interpretation of LHC Run 1 and Run 2 data. We highlight a decade of developments towards ever higher precision in the simulation of particle-collision events.
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Learning Standard Model structure from LHC data with Riemannian flow matching
ShellFlow, a Riemannian flow-matching transformer fed only on-shell and invariant-mass priors and ~8×10^8 recorded ATLAS events, reproduces the SM's dilepton resonances, Weinberg angle, and top/W mass peaks in a singl...
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Single inclusive hadron and jet production in lepton-hadron scattering
Single inclusive high-PT hadron and jet production in lepton-hadron scattering is factorized using a joint QCD+QED approach with universal lepton distribution functions, and predictions are given for JLab and EIC energies.
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A search for electroweak $t\bar{t}Wj$ production in multileptonic final states at $\sqrt{s} = 13$ TeV with the ATLAS detector and bounds on effective field theory operators
First search for electroweak ttWj production at 13 TeV sets observed (expected) 95% CL upper limits of 251 fb (230 fb) versus the SM prediction of 47.7 fb and constrains the O_Ht and O_HQ^(1) EFT operators.
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Search for emerging jets in $pp$ collisions at $\sqrt{s} = 13.6$ TeV with the ATLAS experiment
No evidence for emerging jets was found in 51.8 fb-1 of 13.6 TeV ATLAS data; new exclusion limits are set on s-channel Z' and t-channel scalar mediator models producing pairs of emerging jets.
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Accelerating Berends-Giele recursion for gluons in arbitrary dimensions over finite fields
A publicly available GPU implementation of Berends-Giele recursion computes pure gluon amplitudes in arbitrary spacetime dimensions over finite fields.
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Search for Lorentz-boosted di-$\tau$ resonances produced in association with top quark pairs in $\sqrt{s}=13$ TeV pp collisions with the ATLAS detector
No excess is seen; ATLAS sets a 0.19 fb model-independent visible cross-section limit and 2HDM σ×BR limits of 0.4–0.05 pb for ma = 20–85 GeV using boosted di-τ reconstruction.
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Search for pair-production of vector-like $T$ quarks decaying into a top quark and a spin-0 particle in the diphoton final state in proton proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
No excess is observed in a first ATLAS search for pair-produced vector-like T quarks decaying via an exotic spin-0 particle to diphotons; fiducial cross-section limits and a model exclusion up to m_T≈1620 GeV are set.
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Search for $\textit{tH}$ production in the $ H \to \tau\tau$ decay mode, and a combination with other searches, using $\textit{pp}$ collisions at 13 TeV and 13.6 TeV with the ATLAS detector
ATLAS's combined tH search, including a new H→ττ channel, measures μ_tH = 3.3 ± 1.6 times the SM, with 2.3σ observed significance and an observed 95% CL limit of 6.1×SM.
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Search for heavy Majorana neutrinos in vector boson scattering with $\tau$-lepton final states with the ATLAS detector
ATLAS finds no evidence for heavy Majorana neutrinos in same-sign tau-lepton final states and sets new 95% CL upper limits on |V_τN|², reaching 0.30 at m_N = 900 GeV and extending to m_N = 6.5 TeV.
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Observation of the electroweak production of $\gamma\gamma jj$ at $\sqrt{s}=13$ TeV in $140\ \text{fb}^{-1}$ of $pp$ collision data with the ATLAS detector
ATLAS observes the electroweak production of gamma-gamma plus two jets at 6.2 sigma and measures 13.8 fb, consistent with the Standard Model.
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Agentic Re-Casting using Agentic Re-Simulations
An agentic AI system with a physicist in the loop re-casts an ATLAS ttZ measurement into a global top-quark SMEFT fit and recovers injected coloron Wilson coefficients in a repeatable benchmark.
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Cross-section measurements of boosted Higgs boson production in final states with pairs of hadronically decaying $\tau$-leptons with the ATLAS experiment
ATLAS reports the first boosted H→ττ cross-section measurements for Higgs pT > 300 GeV, with an observed (expected) significance of 3.8 (3.3) standard deviations, consistent with the Standard Model.
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Measurements of the electroweak production of a $W$ boson in association with two jets at $\sqrt{s}=13\,\mathrm{TeV}$ with the ATLAS detector
First differential electroweak W+two-jet cross sections at 13 TeV agree with the Standard Model and give competitive constraints on anomalous triple-gauge-boson couplings.
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Evidence for longitudinally polarised $Z$ bosons in electroweak $W^{\pm}Z$ production in association with two jets from $pp$ collisions at $\sqrt{s} = $ 13 TeV and 13.6 TeV with the ATLAS detector
First measurement of the fraction of longitudinally polarised Z bosons in electroweak WZ+two-jet production: f_X0 = 0.32 ± 0.09, a 4.0σ signal consistent with the Standard Model.
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Simultaneous efficiency measurements of $b$- and $c$-jets in $t\bar{t}$ events from $\sqrt{s}=13.6$ TeV $pp$ collision data collected with the ATLAS detector
Simultaneous measurements of b-jet tagging and c-jet mistagging efficiency scale factors for the ATLAS GN2 tagger achieve precisions below 2% and 5% respectively using 56 fb⁻¹ of 13.6 TeV ttbar data.
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An Optimal Transportation Approach for Improved Confidence Intervals
Optimal-transport couplings are used to construct confidence intervals that reduce coverage error relative to classical quantile-based intervals, with consistency theory and data-driven hyperparameters.
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Search for Higgs boson production at high transverse momentum in the WW decay channel in proton-proton collisions at $\sqrt{s}$ = 13 TeV
A first dedicated search for highly Lorentz-boosted H->WW decays at the LHC finds mu = -0.19 +0.48/-0.46, consistent with no signal above background.
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Measurement of the $|V_{cb}|$ element of the CKM matrix in $t\bar{t}$ decays with the ATLAS detector
ATLAS measures |Vcb|=(50 +11/−14)×10^−3 from on-shell W→cb decays in ttbar events, the first such measurement at the weak scale.
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Search for long-lived charginos and $\tau$-sleptons using final states with a disappearing track in $pp$ collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector
No excess found in 137 fb^-1 of 13 TeV pp data; new 95% CL exclusions reach chargino masses up to 880 GeV and tau-sleptons up to 320 GeV at ~1 ns lifetimes.
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Search for dimuon resonance in the 35 to 75 GeV mass range using 140 fb$^{-1}$ of 13 TeV $pp$ collisions with the ATLAS detector
No dimuon resonance is found in 35-75 GeV with ATLAS's 140 fb^-1 Run-2 dataset; 95% CL fiducial cross-section limits range from 20 to 110 fb.
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Measurement of differential $t$-channel single top (anti)quark production cross-sections at 13 TeV with the ATLAS detector
First separate differential tq and tbarq t-channel single-top cross-sections at 13 TeV, using the full ATLAS Run 2 sample, agree with NLO/NNLO QCD and set −0.12 < C_Qq^{3,1}/Λ² < 0.12 TeV⁻² at 95% CL.
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Search for higgsinos in compressed mass spectra using low-momentum tracks in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
No excess over the Standard Model is observed; ATLAS excludes chargino masses below 126 GeV at 95% CL for mass splittings of 0.3–2 GeV in a simplified higgsino model.
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Search for a Higgs boson produced in association with a charm quark and decaying to a W boson pair in proton-proton collisions at $\sqrt{s}$ = 13 TeV
The first search for a Higgs boson produced with a charm quark and decaying to a W-boson pair sees no excess, and combined with the diphoton channel limits the Higgs-charm coupling to below 47 times the standard model...
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Recoil-Safe Subtraction, Matching and Merging in e+e- to hadrons
The Alaric shower is matched to NLO matrix elements and merged to five jets in e+e- to hadrons, with new analytic subtraction terms validated against Catani-Seymour subtraction.
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NNLO+PS Double Higgs boson production with top-quark mass corrections in GENEVA
First NNLO+parton-shower simulation of double Higgs production in GENEVA that includes approximate finite top-quark mass corrections (FTapprox), validated against MATRIX.
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Search for decays of the Higgs boson into scalar particles decaying into four or six $b$-quarks using $pp$ collisions at $\sqrt{s}= 13\,\mathrm{TeV}$ with the ATLAS detector
With 140 inverse femtobarns of 13 TeV LHC data, ATLAS finds no excess of Higgs decays to new scalars producing four or six bottom quarks, and sets 95% CL upper limits from 4% to 38% on the branching fractions.
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Search for the nonresonant and resonant production of a Higgs boson in association with an additional scalar boson in the $\gamma\gamma\tau\tau$ final state in proton-proton collisions at $\sqrt{s}$ = 13 TeV
CMS finds no evidence for Higgs-pair or new-scalar production in the two-photon plus two-tau final state and sets new upper limits on these processes.
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Efficient many-jet event generation with Flow Matching
A Continuous Normalizing Flow trained with Flow Matching improves unweighting efficiency in high-multiplicity Drell-Yan and top-pair event generation by factors of 150 and 17 over Vegas.
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Theoretical modeling of QCD radiation in off-shell Higgs production through gluon fusion
A controlled three-generator comparison shows that NLO+PS and LO jet merging differ by up to a factor of two in off-shell gg to H to ZZ to 4l predictions, with MadGraph underproducing sub-leading jets.
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Measurements of differential cross-sections of $WbWb$ production in the dilepton channel in $pp$ collisions at $\sqrt{s}$ = 13 TeV using the ATLAS detector
Measurements of WbWb differential cross sections in the dilepton channel at 13 TeV with 140 fb^-1 of ATLAS data provide new constraints on ttbar and tW interference modeling.
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Local Baryon Number at the LHC
A TeV-scale local baryon number theory predicts long-lived charged fermions with kinked-track signatures, multi-lepton events, and a small h->gamma ZB branching ratio, with current LHC data still leaving large allowed...
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Measurement of $W^{\pm}$-boson differential cross-sections in proton-proton collisions with low pile-up data at $\sqrt{s} = 5.02$ TeV and $13$ TeV with the ATLAS detector
ATLAS reports new high-precision W-boson differential cross sections at 5.02 and 13 TeV, consistent with Standard Model predictions and useful for profiling proton parton distribution functions.
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Automated NLO calculations for asymmetric hadron-hadron collisions in MadGraph5_aMC@NLO
A public extension of MadGraph5_aMC@NLO now computes automated NLO QCD cross sections for asymmetric hadron-hadron collisions, validated against MCFM and JAM.
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Energy scale and resolution for anti-$k_t$ jets with radius parameters $R=0.2$ and 0.6 measured in proton-proton collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector
ATLAS presents the first JES and JER measurements for anti-k_t R=0.2 and R=0.6 jets at 13 TeV, using a new direct-matching in situ calibration against R=0.4 jets.
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Improved reconstruction of highly boosted $\tau$-lepton pairs in the $\tau\tau\rightarrow(\mu\nu_{\mu}\nu_{\tau})({hadrons}+\nu_{\tau})$ decay channels with the ATLAS detector
A muon-removal preprocessing step restores tau-hadron identification efficiency in boosted semileptonic tau-pair events to the isolated-tau level, as shown in simulation and validated with Z->tau tau data.
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Search for Higgs boson decays into a pair of pseudoscalar particles in the $\gamma\gamma\tau_{\text{had}}\tau_{\text{had}}$ final state using $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
Using 140 fb^-1 of 13 TeV pp collisions, ATLAS finds no excess and sets 95% CL upper limits of 0.2% to 2% on B(H to aa to gamma gamma tau tau) for m_a from 10 to 60 GeV.
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Test of lepton flavour universality in $W$-boson decays into electrons and $\tau$-leptons using $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
ATLAS measures R_tau/e = 0.975 +/- 0.012 (stat) +/- 0.020 (syst) for W boson decays to tau versus electron, consistent with lepton flavour universality.
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Cross-section measurements for the production of a $W$-boson in association with high-transverse-momentum jets in $pp$ collisions at $\sqrt{s}$= 13 TeV with the ATLAS detector
New ATLAS measurements of W+jet production with leading-jet transverse momentum above 500 GeV, including a new collinear phase space, are largely described by NLO multi-leg generators and NNLO MCFM, with MCFM undersho...
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Measurement of off-shell Higgs boson production in the $H^*\rightarrow ZZ\rightarrow 4\ell$ decay channel using a neural simulation-based inference technique in 13 TeV $pp$ collisions with the ATLAS detector
Using neural simulation-based inference, ATLAS improves evidence for off-shell Higgs production in ZZ -> 4l to 2.5 sigma observed (1.3 sigma expected) and measures Gamma_H = 4.3 +2.7 -1.9 MeV.
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Search for Higgs boson decays into a $Z$ boson and a light hadronically decaying resonance in $pp$ collisions at $\sqrt{s}$=13 TeV with the ATLAS detector
ATLAS observes no excess in H to Z plus light hadronic resonance decays and sets 95% CL branching-fraction limits near 10% for low resonance masses, improving on the previous search.
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Flow Annealed Importance Sampling Bootstrap meets Differentiable Particle Physics
Flow Annealed Importance Sampling Bootstrap, applied with replay buffering to differentiable matrix elements, achieves higher importance sampling efficiency per target evaluation than rKLD or fKLD in high-dimensional ...
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Observation of top-quark pair production in lead-lead collisions at $\sqrt{s_\mathrm{NN}}=5.02$ TeV with the ATLAS detector
First observation of top quark pair production in Pb+Pb collisions at 5.02 TeV, with a 5.0 sigma significance and a measured cross-section of 3.6 microbarns.
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Reconstruction and identification of pairs of collimated $\tau$-leptons decaying hadronically using $\sqrt{s}=13$ TeV $pp$ collision data with the ATLAS detector
A low-pT collimated hadronic di-tau tagger is built from a large-radius jet with two subjets and a BDT, with data-to-simulation scale factors of 1.00 and 1.01 measured in Z-gamma events.
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CIMBA: fast Monte Carlo generation using cubic interpolation
CIMBA provides fast, smooth particle-gun sampling of Pythia-generated kinematic distributions using cubic interpolation with analytic inverse CDFs.
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Measurement of the Higgs boson decay to a low-mass dilepton system and a photon in $pp$ collisions at $\sqrt{s} =$ 13 and 13.6 TeV with the ATLAS detector
Combined Run-2+Run-3 ATLAS measurement of H to ell ell gamma (m_ll < 30 GeV) gives mu = 1.03 (+0.35/-0.32) with 3.4 sigma observed (3.3 sigma expected) significance, consistent with the Standard Model.
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Study of $t\bar{t}H$ and $tH$ production in the $H\to\tau\tau$ channel in $pp$ collisions at $\sqrt{s}=13$ TeV and 13.6 TeV with the ATLAS detector
Simultaneous measurement of ttH (mu=1.51) and tH (mu=-0.4) in fully hadronic H→tau tau final states at 13/13.6 TeV, consistent with the Standard Model.
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Measurement of the $b$-jet identification efficiency in dileptonic $t\bar{t}$ events using proton-proton collision data at $\sqrt{s}=13.6$ TeV collected with the ATLAS detector
The GN2 b-jet tagger is calibrated in 56 fb⁻¹ of 13.6 TeV pp data using dileptonic tt̄ events, yielding data-to-simulation scale factors of 0.9–1.3 with ~1% uncertainty in the best bins.
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Search for decays of the Higgs boson into pair-produced pseudoscalar particles decaying into $\tau^+\tau^-\tau^+\tau^-$ using $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
No significant excess is observed; 95% CL upper limits on B(H→aa→4τ) range from 0.06 to 0.23 for ma between 15 and 60 GeV.
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Quark-Lepton Unification Signatures
In the minimal low-scale quark-lepton unification model, scalar leptoquarks decay mainly to third-generation quarks and leptons, and current LHC measurements exclude masses below roughly 1.0–1.15 TeV in the y2=0 benchmark.
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Measurement of the Higgs boson production in association with top quarks in multilepton final states in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
ATLAS measures the ttH cross-section at 0.63+0.20−0.19 of the Standard Model prediction (3.3σ observed, 5.3σ expected) and excludes top-Higgs CP-mixing angles |α|>62° at 68% confidence.
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Herwig 7 with the Lund String Model: Tuning and Comparative Hadronization Studies
A Lund string model tune inside Herwig 7, the LH Tune, gives competitive descriptions of many LEP and LHC observables and enables fixed-shower comparison of string vs cluster hadronization.
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Phase space sampling with Markov Chain Monte Carlo methods
MCMC via BAT.jl reproduces Sherpa's Z+3 jets distributions for two observables, but full 13-dimensional phase space validation is missing.
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A Cell Resampler study of Negative Weights in Multi-jet Merged Samples
Cell resampling with an adjusted metric reduces negative Monte Carlo event weights in NLO-matched, multi-jet merged pp to gamma gamma plus jets samples with small distortions to most distributions.
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Measurements of top-quark pair differential and double-differential cross-sections in the $\ell$+jets channel with $pp$ collisions at $\sqrt{s}=13$ TeV using the ATLAS detector
ATLAS presents single- and double-differential top-quark pair cross-sections in the l+jets channel at 13 TeV, finding good overall agreement with predictions but tensions in boosted high-pT tails.
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Search for non-resonant Higgs boson pair production in the $bb\ell\nu\ell\nu$ final state with the ATLAS detector in $pp$ collisions at $\sqrt{s} = 13$ TeV
With 139 fb^-1 of 13 TeV proton-proton data, ATLAS sets a 95% CL upper limit of 1.2 pb (40 times the Standard Model) on non-resonant Higgs boson pair production in the bbllvv final state.
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Improved analysis of non-resonant Higgs boson pair production in the $b\bar{b}\tau^+\tau^-$ final state with $196$ fb$^{-1}$ of data collected at $\sqrt{s}$ = 13 TeV and 13.6 TeV with the ATLAS detector
ATLAS finds μ_HH = 2.6^{+1.4}_{-1.0} in bbττ with Run 2+3 data, 2.6σ over background-only, and first 3.5σ evidence for ZH in this final state.
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A measurement of the Higgs boson mass in the diphoton decay channel in proton-proton collisions at $\sqrt{s}$ = 13 TeV
CMS measures the Higgs mass in H→γγ with 138 fb⁻¹ at 13 TeV as 125.13 ± 0.15 GeV, and 125.06 ± 0.14 GeV when combined with 7+8 TeV diphoton data.
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The calibration of large-radius jets using the Run 2 dataset with the ATLAS detector
Large-radius jets from Unified Flow Objects, groomed with soft drop, are calibrated against Monte Carlo and collision data, with in-situ-validated jet energy and mass scales at 1% (≤1 TeV) to 2–3% (≤2 TeV) precision.
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Search for heavy neutral leptons in decays of W bosons produced in 13 TeV pp collisions using prompt signatures in the ATLAS detector
The ATLAS search finds no evidence of heavy neutral leptons in W boson decays and sets the strongest limits to date on their mixing with electron and muon neutrinos in the 15-30 GeV mass range.
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Search for the Higgs boson decay to a $Z$ boson and a photon in $pp$ collisions at $\sqrt{s}=13$ TeV and $13.6$ TeV with the ATLAS detector
ATLAS measures the Higgs to Z and photon signal yield as 1.3 +0.6 -0.5 times the Standard Model prediction in the combined 305 inverse femtobarn dataset, with 2.5 sigma observed significance.
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