Pair production of long-lived scalars via off-shell Higgs at the LHC is probed with displaced-vertex searches, excluding masses up to ~230 GeV with current ATLAS data for a benchmark coupling.
Automatic evaluation of UV and R2 terms for beyond the Standard Model Lagrangians: a proof-of-principle
7 Pith papers cite this work. Polarity classification is still indexing.
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abstract
The computation of renormalized one-loop amplitudes in quantum field theory requires not only the knowledge of the Lagrangian density and the corresponding Feynman rules, but also that of the ultraviolet counterterms. More in general, and depending also on the methods used in the actual computation of the one-loop amplitudes, additional interactions might be needed. One example is that of the R2 rational terms in the OPP method. In this paper, we argue that the determination of all elements necessary for loop computations in arbitrary models can be automated starting only from information on the Lagrangian at the tree-level. In particular, we show how the R2 rational and ultraviolet counterterms for any renormalizable model can be computed with the help of a new package, which we name NLOCT and builds upon FeynRules and FeynArts. To show the potential of our approach, we calculate all additional rules that are needed to promote a Two Higgs Doublet Model Lagrangian to one-loop computations in QCD and electroweak couplings.
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UNVERDICTED 7representative citing papers
Mixed QCD-QED contributions from gγ initial states enhance pair-production cross sections of charge-5/3 leptoquarks by up to 33%, strengthening ATLAS-derived mass exclusions.
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.
Real scalar singlet extension of SM permits strong first-order EWPT for singlet masses up to ~1 TeV; HL-LHC tests large fraction of space while FCC offers discovery reach.
Interference effects and extra decay channels in N2HDM resonant triple Higgs production significantly alter kinematic distributions, limiting simplified approximations.
A color-octet scalar Θ pair-produced via gluons and decaying to quark pairs can account for the CMS excess in equal-mass dijet pairs at 0.95 TeV with a 65 fb cross section for the real case.
Computes tree-level two-body decays of heavy scalars in GNM and pseudoscalar lifetime in IDM limit.
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Probing pair production of long-lived scalars via an off-shell Standard-Model-like Higgs boson at the LHC
Pair production of long-lived scalars via off-shell Higgs at the LHC is probed with displaced-vertex searches, excluding masses up to ~230 GeV with current ATLAS data for a benchmark coupling.
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Photon-initiated enhancements in the pair production of highly charged coloured particles
Mixed QCD-QED contributions from gγ initial states enhance pair-production cross sections of charge-5/3 leptoquarks by up to 33%, strengthening ATLAS-derived mass exclusions.
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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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Constraining the real scalar singlet extension of the SM
Real scalar singlet extension of SM permits strong first-order EWPT for singlet masses up to ~1 TeV; HL-LHC tests large fraction of space while FCC offers discovery reach.
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Kinematic Riffs and Interference Effects in Triple Higgs Production in the N2HDM
Interference effects and extra decay channels in N2HDM resonant triple Higgs production significantly alter kinematic distributions, limiting simplified approximations.
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Octet scalars shaping LHC distributions in 4-jet final states
A color-octet scalar Θ pair-produced via gluons and decaying to quark pairs can account for the CMS excess in equal-mass dijet pairs at 0.95 TeV with a 65 fb cross section for the real case.
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Decays of heavy scalars in the Grimus-Neufeld model
Computes tree-level two-body decays of heavy scalars in GNM and pseudoscalar lifetime in IDM limit.