Using partial-wave unitarity to bound the valid energy range of SMEFT and HEFT operators, the thesis finds non-empty discovery regions for beyond-Standard-Model effects in same-sign WW scattering at HL-LHC and HE-LHC.
Measurement of WZ production in proton-proton collisions at sqrt(s) = 7 TeV with the ATLAS detector
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abstract
A study of WZ production in proton-proton collisions at sqrt(s) = 7 TeV is presented using data corresponding to an integrated luminosity of 4.6 fb^-1 collected with the ATLAS detector at the Large Hadron Collider in 2011. In total, 317 candidates, with a background expectation of 68+/-10 events, are observed in double-leptonic decay final states with electrons, muons and missing transverse momentum. The total cross-section is determined to be sigma_WZ(tot) = 19.0+1.4/-1.3(stat.)+/-0.9(syst.)+/-0.4(lumi.) pb, consistent with the Standard Model expectation of 17.6+1.1/-1.0 pb. Limits on anomalous triple gauge boson couplings are derived using the transverse momentum spectrum of Z bosons in the selected events. The cross section is also presented as a function of Z boson transverse momentum and diboson invariant mass.
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The W and Z scattering as a probe of physics beyond the Standard Model: Effective Field Theory approach
Using partial-wave unitarity to bound the valid energy range of SMEFT and HEFT operators, the thesis finds non-empty discovery regions for beyond-Standard-Model effects in same-sign WW scattering at HL-LHC and HE-LHC.