Speaker
Bing Zhou
(University of Michigan (US))
Description
Measurements of the cross sections of the production of pairs of electroweak
gauge bosons at the LHC constitute stringent tests of the electroweak sector
of the Standard Model and provide a model-independent means to search for
new physics at the TeV scale.
The ATLAS collaboration has measured inclusive and differential cross sections
of the production of ZZ pairs in final states with four charged leptons using
data corresponding to 20.3 /fb at a centre-of-mass energy of 8 TeV and data
corresponding to 3.2 /fb at a center-of-mass energy of 13 TeV. The studies
at 8 TeV are extended to the final state of two charged leptons and two
neutrinos, which enhances the acceptance at high transverse momentum.
The ATLAS collaboration has also carried out detailed measurements of
integrated and differential cross sections of the production of a Z boson in
association with an isolated photon using data corresponding
to 20.3 /fb at a centre-of-mass energy of 8 TeV. These measurements are
carried out in Z boson decays to both charged lepton pairs and neutrinos.
These measurements are compared to calculations at NNLO in pQCD and provide
constraints on new physics, by setting limits on anomalous triple gauge
couplings.
The ATLAS collaboration has also carried out the analysis of the inclusive
four-lepton lineshape measurement in the 8 TeV data. The study focuses on
the differential cross section as a function of the 4-lepton mass spectrum
ranging from 80 to 1000 GeV where several distinct physics processes give
rise to the production of 4-lepton final state.
