Les Houches

Project Description

Study of top-quark mass scheme uncertainties (MSbar/OS) in Higgs processes:

• HH (LO/NLO)
• HJ (LO/NLO asymptotic expansion)
• ggHZ vs ggZZ (LO)
• H* (LO/NLO)

Open Questions:

• How are these various processes affected by the mass scheme uncertainty?
• To what extent is this problem coming from “Triangle-type” topologies vs “Box-type” topologies? (See for example expanded result of Steinhauser et al.)
• Can we say anything about what is a sensible (or not sensible) choice of scheme?
• Should we be treating masses running in the loops differently from those entering the Yukawa couplings?
• How much of this behaviour is due to the mass dependence of the Yukawa vs. top quarks in loop?
• How large is this uncertainty in the context of the onshell/ofshell Higgs measurements?

References

• Gluon fusion into Higgs pairs at NLO QCD and the top mass scheme
• Slides (Michael Spira), 17 June
• High-Energy Limit of QCD beyond Sudakov Approximation
• High-Energy Limit of Mass-Suppressed Amplitudes in Gauge Theories
• Double Higgs boson production at NLO in the high-energy limit: complete analytic results
• Two-loop amplitudes for processes gg→Hg,qg→Hq and qq¯→Hg at large Higgs transverse momentum

Interested Participants

• Javier Mazzitelli
• Daniel de Florian
• Stephen Jones
• Michael Spira
• Xuan Chen
• Raoul Röntsch
• Joey Huston
• …