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ECFA meeting on e+e- to ZH angular measurements

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Z polarization for Higgs self coupling (Balbeer)

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- asymmetry-only constraint with polarized beams can get accuracy of a few % at 350-500 GeV

  o but luminosity is higher than normal predictions

  o suggest to also estimate sensitivity using standard luminosity scenarios and (ideally) detector simulation

 

- what about combining rate and asymmetry to constrain self-coupling?

 

- changing polarization increases the cross section but doesn't change the kappa limit

 

 

Entanglement with e+e- sqrt(s)=240/250 GeV collisions (Alan)

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- Did H->tau-tau CP study gain from quantum information variables?

 

- in the future higher-order corrections could be investigated

 

- prospects for H->WW at e+e-? No studies currently

 

 

Updates for the FCC-ee Higgs study (Nicholas)

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- sensitivity improved by a factor of ~5 due to tightening of constraints

  o appears to be primarily the recoil mass?

 

- suggest to use angular+rate information to constrain a set of CP-odd and CP-even operators

  o useful to know how many linear combinations of operators can be meaningfully constrained

  o can define combinations through PCA

 

 

CP measurements at the LHC (Sandra)

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- can the LHC combine CP analyses and present the results in terms of Wilson coefficients (using PCA)?

 

- ATLAS and CMS comparisons seem not to be apples-to-apples, should sort out

 

- LHC CP combination in terms of Wilson coefficients can be compared with e+e-

  o additional information from e+e- can be obtained using energy dependence and polarization

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