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SUMMARY:Predictions for multiple Higgs production: comparing HEFT and SMEF
 T
DTSTART;VALUE=DATE-TIME:20251119T173000Z
DTEND;VALUE=DATE-TIME:20251119T174500Z
DTSTAMP;VALUE=DATE-TIME:20260422T105527Z
UID:indico-contribution-28876@indico.ific.uv.es
DESCRIPTION:Speakers: Juan José Sanz-Cillero (Universidad Complutense de 
 Madrid and IPARCOS)\nWe discuss various aspects of multi-Higgs boson produ
 ction from longitudinal electroweak (EW) gauge boson scattering in the TeV
  region as the necessary information to characterise the Flare function\, 
 F(h)\, which determines whether the Standard Model EFT (SMEFT) or the Higg
 s EFT (HEFT -also sometimes referred as the EW Chiral Lagrangian-) is the 
 appropriate description. We analyze various correlations among Higgs coupl
 ings that help decide\, from experimental data\, whether we have a viable 
 SMEFT low-energy scenario. We present an effective field theory study of s
 cattering into states with one\, two\, three and four Higgs bosons in the 
 final state\, in addition to possible extra EW gauge bosons. We show sever
 al important cancellations and simplifications which allows us to display 
 these amplitudes in a very compact form. We show that for a growing number
  of Higgs bosons in the final state\, SMEFT leads to an important suppress
 ion of the cross sections with a large number of Higgses\, while this does
  not happen for general HEFT low-energy scenarios (which do not accept a S
 MEFT description). We provide some numerical estimates of these multi-Higg
 s cross sections based on current experimental bounds. Finally\, we show h
 ow field redefinitions -or an appropriate choice of the scalar manifold co
 ordinates- can provide a more transparent picture of these processes.\n\nh
 ttps://indico.ific.uv.es/event/8035/contributions/28876/
LOCATION:
URL:https://indico.ific.uv.es/event/8035/contributions/28876/
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