Vector Boson scattering at the Lhc
Alfredo Urbano
CERN, Theory division
SS
Suppressed QCD background, and reduced contribution from channels where transverse and longitudinal gauge bosons are mixed
OS
Less clean because of the large background
generated by top-antitop
pair production
The presence of resonances is the most dramatic signal for a strongly interacting sector.
However, they may be too heavy or broad to be seen at the LHC
The discovery of a non-zero coefficient in the effective Lagrangian is a more systematic way to search for a strongly interacting sector
In collaboration with:
Marco Fabbrichesi
Michele Pinamonti
Alberto Tonero
Other BG processes
Selection cuts
RpT cut: Doroba et al., Phys.Rev. D86 (2012) 036011
Separate EW from QCD
For EW, separate transverse (90%) from logitudinal
SM Lagrangian with non-linearly realized EW symmetry
Longitudinal Ws are a
window on the EW symmetry breaking mechanism
SS
Results
OS
Systematic errors (already at the level of 10%) are important
The natural UV cutoff for the electroweak chiral Lagrangian with a light Higgs is around 3 TeV
At the c.o.m. energies of a 100 TeV collider, a modelling of the
resonances of the strong sector is mandatory