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WG2 winter meeting
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Europe/Zurich
4/3-006 - TH Conference Room (CERN)
STXS theory (Frank)
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- 100% correlation between WH & ZH
o Run 1 further correlated with VV and gg->ZH/VV
o How to correlate with backgrounds?
- PDF+alphaS?
o Standard propagation techniques
o PDF sets can be reduced from 100 to 30 but should be checked for each case
- Can we get the PS+UE uncertainty into this scheme?
STXS experiment (Frank/Pedja)
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- New ggF pTH bins (200,350,500,inf)
o pTH>350 bins include all jet multiplicities
o Should we move 350 to 300 so that we can potentially measure the 300-500 bin?
x Consensus is to keep 350 because of theory preference and prior diffXS agreement
- Will add flag for STXS version for user
- Need to figure out how to provide covariances of bins with low yields
- Long discussion on adding POs to STXS, make sure it is independent of production (decay info only)
- Can we use the STXS uncertainty prescription for diffXS?
PO results from ATLAS (Andrea)
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- plan to separate 4e, 4mu and 2e2mu for the future
- Angular information could be added to improve sensitivity, however the effect is expected to be small
o Further study is required to quantify this
- POs are extracted from double differential cross sections to demonstrate an application of the measurements
o A dedicated & optimized PO analysis should be developed to extract more information from the events
PO prospects (Admir)
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- if PO observed then it indicates EW breaking is non-linear (linear breaking more tightly constrained)
- should consider how to optimize analyses for determining these couplings
- are POs used to constrain specific models? not competitive with other bounds, so not used
- try to choose one framework and work to optimize and document to facilitate future combination
o consider both inclusive and exclusive of production information
EFT results from ATLAS (Gabija)
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- fit CWW-cB since S=cWW+cB is constrained by EW data and taken to be zero
Equations relating STXS to EFT (Chris)
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- decay can be incorporated once it is settled how to add it to STXS
- effect on background will need to be taken into account with full EFT
EFT @ NLO in QCD (Eleni)
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- near-term will make existing operators public
- soon to add 4-fermion couplings
- can add running couplings in the future
CP-odd operators and information geometry (Tilman)
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- imaginary 're-scattering' component of CP-even coefficient can affect VBF CP-odd coefficient determination
o not an effect in a standard EFT treatment (coefficients are real)
- is Dphijj optimal? Dphill?
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