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Generating Feynman Diagrams and Amplitudes with FeynArts 3
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This paper describes the Mathematica package FeynArts used for the generation and visualization of Feynman diagrams and amplitudes. The main features of version 3 are: generation of diagrams at three levels, user-definable model files, support for supersymmetric models, and publication-quality Feynman diagrams in PostScript or LaTeX.
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Showing 60 of 82 Pith papers that cite this
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Two-loop form factors for $P$-wave quarkonium production and decay
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The Majoron at two loops
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Two-loop QCD amplitudes for $t\bar{t}W$ production at the LHC in the leading-colour approximation
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Quantum Tomography of Top Quarks as a Probe of Charge-Parity Violation
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Exclusive photoproduction of a di-meson pair with large invariant mass
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Higgs boson decay to massive bottom quarks at order $\alpha_s^4$ induced by top-quark Yukawa couplings
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Fermionic Electroweak Two-Loop Corrections to Drell-Yan and Related Processes
The full NNLO electroweak corrections with closed fermion loops to e+e- → ffbar (and Drell-Yan) were calculated semi-numerically and found to modify NLO cross-sections by about 1%.
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Analytical two-loop amplitudes of $e^{+} e^{-} \longrightarrow \boldsymbol{J} / \boldsymbol{\psi}+\boldsymbol{\eta}_c$ at $B$ factories
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Hot news on the phase structure of the SMEFT
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$B\rightarrow K + \text{axion-like particles}$: effective versus UV-complete models and enhanced two-loop contributions
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Light quark fragmentation into S-wave fully charmed tetraquark
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Efficient on-shell matching
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Complete Two-loop Renormalization Group Equation of the Weinberg Operator
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Electroweak and QCD Corrections to $Z$ and $W$ pole observables in the SMEFT
The complete NLO electroweak and QCD corrections to Z and W pole observables in the SMEFT shift fitted Wilson coefficient bounds by 5 to 10 percent and introduce 22 new operator dependencies.
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Proposal for the validation of Monte Carlo implementations of the standard model effective field theory
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Electroweak precision observables at NLL order in the SMEFT
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Precise predictions for double Higgs production in association with a vector boson in Effective Field Theory
First NNLO QCD cross sections for pp→Vhh in SMEFT and HEFT, provided as interpolated coefficients; W±hh K-factors are almost EFT-independent while Zhh is sensitive to gluon-initiated contributions.
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Next-to-leading order FsQED corrections to radiative pion pair production
FsQED NLO structure-dependent corrections to radiative pion-pair production are at the permille (mass) to percent (angular/AFB) level, agree with GVMD, and are now in BabaYaga@NLO.
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Unveiling the Vanishing Higgsino-Nucleon Scattering in the MSSM at Next-to-Leading Order
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Conversion-Driven Baryogenesis in Flavored Dark Matter Models
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Semi-analytical results for $e^+e^-\to J/\psi + X_{{\rm non\,}c\bar{c}}$ up to $\mathcal{O}(\alpha_s v^2)$ at B factories
NRQCD calculation of O(α_s), O(v²) and first-time O(α_s v²) corrections to e⁺e⁻ → J/ψ + X_non c c̄, with r = m_c/√s expansions to r⁴⁰, yielding cross section 0.530 pb consistent with Belle but angular parameter deviating >2σ.
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Semi-analytical two-loop QCD corrections to $e^+e^-\to J/\psi+\chi_{cJ}$ at B factories
Semi-analytical NNLO QCD corrections to e+e- -> J/psi + chi_cJ are computed via asymptotic expansions, yielding large corrections that reduce scale dependence for some channels and a discrepancy with Belle data on the...
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Towards the two-loop electroweak corrections to the Drell-Yan process: the complete fermionic contributions
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Complex bumblebee model
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Lorentz violating quadratic gravity
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Upper Bound on Parity Breaking Scale for Doublet WIMP Dark Matter
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Higher order electroweak radiative corrections in lepton-proton scattering using covariant approach
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Light Neutral Higgs-Boson Production at $e^+e^-$ Colliders in the Complex MSSM and NMSSM: A Full One-Loop Analysis
First full one-loop computation of e+e- -> h1 Z in the cNMSSM: corrections near -10%, nearly identical to the MSSM once the light Higgs mass is fixed.
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Effect of anomalous $HHH$ coupling on the decay $H\rightarrow Z\,Z^*\rightarrow$ 4 charged leptons
The H to 4 lepton partial width shifts by up to about 6 percent at one loop when the Higgs trilinear coupling is anomalous, offering a new observable for the Higgs self-coupling.
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Quark-universal $U(1)$ breaking scalar at the LHC
In a quark-universal U(1)_B model, the scalar φ that breaks the symmetry can be discovered first through its diphoton decay, and its rate can explain the 95 GeV diphoton excess.
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Current-current operator contribution to the decay matrix in $B$-meson mixing at next-to-next-to-leading order of QCD
The full charm-mass dependence of the three-loop current-current contribution to the B-meson decay matrix is computed, yielding Delta_Gamma_s = (0.077 +/- 0.016) ps^-1 with the leading-term perturbative error reduced ...
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Systematic approach to $\ell$-loop planar integrands from the classical equation of motion
A recursion formula for ℓ-loop planar integrands in colored QFTs is derived from the classical equation of motion via comb components and loop kernels.
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Rare $W \to B_c + \gamma$ decay up to the NNLO and NLL accuracy in QCD
The rare decay W to Bc plus photon gets NNLO QCD corrections that reduce the width by 31 percent, giving a branching fraction of 1.522 times 10 to the minus 10 after NLL resummation.
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Heavy neutral leptons and top quarks in effective field theory
Long-lived heavy neutral leptons produced via top-quark effective operators could be probed at the HL-LHC up to new-physics scales around 12 TeV at ATLAS and 4.5 TeV at MATHUSLA or ANUBIS.
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New Physics contamination to precision luminosity measurements at future $e^+e^-$ colliders
Heavy new physics four-fermion operators can bias small-angle Bhabha luminosity calibration at future e+e- colliders at the level of the design precision, and luminosity-independent Bhabha asymmetries can constrain th...
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Multi-component secluded WIMP dark matter and Dirac neutrino masses with an extra Abelian gauge symmetry
An anomaly-free two-component secluded WIMP model with a dark photon, dark Higgs, and scotogenic Dirac neutrino masses can account for the observed relic density while evading cosmological bounds.
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Next-to-leading order QCD corrections to $Z\to q\bar{q}\gamma$, $q\bar{q}\gamma\gamma$
NLO QCD corrections reduce the predicted widths of Z to two jets plus one photon by 6.03% and to two jets plus two photons by 12.39%.
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Higgs-Boson Masses and Mixings in the MSSM with CP Violation and Heavy SUSY Particles
In the MSSM with heavy SUSY particles and complex phases, the lightest Higgs mass can vary by up to about 20 GeV with the phase of the trilinear couplings, while its CP-odd admixture drops below 0.5% once the charged ...
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SMEFT-Pheno-Agent: a natural-language-driven AI agent for machine-learning-assisted Standard Model Effective Field Theory phenomenology
An AI agent orchestrates a twelve-phase, auditable SMEFT phenomenology workflow that delegates all numerical work to validated HEP tools and locks configuration parameters.
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Renormalization of the SMEFT to Dimension Eight: Fermionic Interactions II
Computes one-loop mixing of bosonic and two-fermion interactions into two-fermion operators in dim-8 SMEFT, leaving only four-fermion to two-fermion mixing to finish the renormalization program.
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Electroweak phase transitions in a $U(1)_D$ extension of the standard model with dimension-six operators: Gravitational waves and LHC signatures
A dimension-six operator |H|^2|phi|^4 in a U(1)_D singlet extension relaxes the usual Higgs-portal and mixing-angle correlation, enabling strong first-order electroweak phase transitions driven primarily by the singlet VEV.
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Scattering amplitudes in dimensionless quadratic gravity coupled to QED
Tree-level amplitudes in agravity-coupled QED produce differential cross sections scaling universally as dσ/dΩ ∝ 1/s at ultra-Planckian energies across multiple channels.
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Higgs pair production in gluon fusion to higher orders in Higgs Effective Field Theory
Consistent NLO power counting in HEFT for di-Higgs gluon fusion requires higher-dimensional operators beyond leading order, affecting kinematic benchmarks used in experiments.
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The Art of Counting: a reappraisal of the HEFT expansion
HEFT admits two consistent power counting schemes, one with a single low-energy scale v and one with two scales v < f, each allowing systematic truncation of operators and amplitudes for any normalization choice.
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Probing one-loop--induced decay channel $H^\pm \to W^\pm\gamma$ in the Two Higgs Doublet Models at muon-TeV colliders
The one-loop decay H±→W±γ is re-derived in the general Rξ gauge and used to predict that a 3 TeV muon collider could see a charged Higgs signal, though the conclusion reports only 2 sigma for several benchmarks.
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NLO Corrections to Dimuonium Production in Photon-Photon Collision
NLO QED corrections to para- and ortho-dimuonium production in γγ collisions are calculated via NRQED, yielding negative corrections for both states.
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Flavour and precision probes of a class of scotogenic models
Full next-to-leading-order corrections to leptonic Z and Higgs decays are derived for the T1-2-A scotogenic model, and the resulting cLFV and electroweak observables are scanned to identify future collider probes.
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