WG1 periodic meeting

Monday 2 Dec 2019, 09:00 → 11:00 Europe/Zurich

WG1 periodic meeting
Monday 2 Dec 2019, 09:00 → 11:00 CET.

Up to 15 participants.

- Unitarization effects in the EChL predictions of WZ scattering at the LHC:

# Are there some recommendations in using unitary method?
No. One could argue that K-matrix and IAM are better.
But there is no clear cut.

# How can this procedure be used to infer constraints on the EFT, since unitarity violation signals the EFT is breaking down?
the idea would be that the unitarity gives an upper limit to the amplitude. We can also predict resonances with the unitarization method, so the EFT is valid as the tail of this resonance.

# Comment about the framework.
Are you beyond the EFT framework applicability?
(Especially close to resonance)
Specificity of the non-linear EFT.

- QCD Corrections in SMEFT Fits to WZ and WW Production

# Why not ZZ considered?
Because you have interferences between WW and ZZ.
In the SM, these are known.
But with EFT, one should be careful.

# Is there some understanding of why WW and WZ are different?
In the WZ case the zero radiation amplitude is significantly different in the SM and in the EFT, which causes the QCD corrections to give a different scaling.

- An event generator for same-sign W-boson scattering at the LHC including electroweak corrections

# Leading behaviour of the EW corrections?
These are the virtual/bosonic part and not the photon part.

09:00 → 09:25 An event generator for same-sign W-boson scattering at the LHC including electroweak corrections

[1906.01863]

Speaker: Mauro Chiesa (University of Würzburg)

vbs_chiesa.pdf

09:30 → 09:55 Unitarization effects in the EChL predictions of WZ scattering at the LHC

[1907.06668]

Speaker: Roberto Anibal Morales Valbuena (Universidad Nacional de La Plata (AR))

VBS_meeting-RMorales.pdf

10:00 → 10:25 QCD Corrections in SMEFT Fits to WZ and WW Production

[1909.11576]

Speaker: Dr Julien Baglio (CERN)

baglio_vbscan-meeting_02-12-2019.pdf