The HiggsTools Handbook: Concepts and observables for deciphering the Nature of the Higgs Sector

Abstract

This Report summarizes some of the activities of the HiggsTools Initial Training Network working group in the period 2015-2017. The main goal of this working group was to produce a document discussing various aspects of state-of-the-art Higgs physics at the Large Hadron Collider (LHC) in a pedagogic manner. The first part of the Report is devoted to a description of phenomenological searches for New Physics at the LHC. As the experimental measurements become more and more precise, there is a pressing need for a consistent framework in which deviations from the SM predictions can be computed precisely. We critically review the use of the \k{appa}-framework, fiducial and simplified template cross sections, effective field theories, pseudo-observables and phenomenological Lagrangians. In the second part of the Report, we propose ${\phi }_{\eta }^{\ast }$ as a new and complementary observable for studying Higgs boson production at large transverse momentum in the case where the Higgs boson decays to two photons. We make a detailed study of the phenomenology of the ${\phi }_{\eta }^{\ast }$ variable, contrasting the behaviour with the Higgs transverse momentum distribution using a variety of theoretical tools including event generators and fixed order perturbative computations.

142 pages + references

References in corpus (41)

• A parton shower algorithm based on Catani-Seymour dipole factorisation
• Reducing full one-loop amplitudes to scalar integrals at the integrand level
• Classical Polylogarithms for Amplitudes and Wilson Loops
• A standard format for Les Houches Event Files
• VBFNLO: A parton level Monte Carlo for processes with electroweak bosons
• FIRE5: a C++ implementation of Feynman Integral REduction
• SusHi: A program for the calculation of Higgs production in gluon fusion and bottom-quark annihilation in the Standard Model and the MSSM
• Algorithms for the symbolic integration of hyperlogarithms with applications to Feynman integrals
• Status of the Higgs Singlet Extension of the Standard Model after LHC Run 1
• Lectures on differential equations for Feynman integrals
• Precise predictions for the Higgs-boson decay H -> W W/Z Z -> 4 leptons
• Direct extraction of one-loop integral coefficients
• Full one-loop amplitudes from tree amplitudes
• Introduction to Effective Field Theory
• Scalar one-loop 4-point integrals
• Precise QCD predictions for the production of Higgs+jet final states
• Extending the Standard Model Effective Field Theory with the Complete Set of Dimension-7 Operators
• Recola2: REcursive Computation of One-Loop Amplitudes 2
• Helac-Phegas: a generator for all parton level processes
• Precision Measurements of Higgs Couplings: Implications for New Physics Scales
• The two-loop sunrise graph in two space-time dimensions with arbitrary masses in terms of elliptic dilogarithms
• A minimal set of top-Higgs anomalous couplings
• Two-loop planar master integrals for Higgs$\to 3$ partons with full heavy-quark mass dependence
• Hilbert Series for Constructing Lagrangians: expanding the phenomenologist's toolbox
• NNLO QCD corrections to Higgs boson production at large transverse momentum
• Higgs production in association with a top-antitop pair in the Standard Model Effective Field Theory at NLO in QCD
• Narrow-width approximation accuracy
• A Systematic Approach to the SILH Lagrangian
• Group structure of the integration-by-part identities and its application to the reduction of multiloop integrals
• Precision calculations for the Higgs decays H-->ZZ/WW-->4leptons
• Next-to-leading-order electroweak corrections to the production of four charged leptons at the LHC
• Effective Field Theory for Higgs Plus Jet Production
• Boosted Higgs Shapes
• Pseudo-observables in Higgs decays
• One-loop phi-MHV amplitudes using the unitarity bootstrap: the general helicity case
• The Higgs boson at high $p_T$
• Usefulness of effective field theory for boosted Higgs production
• Elliptic Functions and Maximal Unitarity
• QCD radiative corrections for $h\to b\bar{b}$ in the Standard Model Dimension-6 EFT
• Full mass dependence in Higgs boson production in association with jets at the LHC and FCC
• Matching Matters!