Thu, Jan 15, 2015, 2:00 pm to 3:00 pm
Location:
Jadwin A06
A new resonance decaying to a pair of vector bosons was discovered in 2012 by the ATLAS and
CMS experiments at the LHC. In the wake of this discovery a rush of measurements was made to
characterize this discovery. The four-lepton final state has been instrumental in both the discovery
and characterization of this new particle. With only about 20 events seen in the resonance peak
at 125GeV the CMS experiment has been able to make considerable progress in characterizing the
Higgs-like boson using the wealth of information in this final state in concert with other decay modes.
Two recent results from the CMS experiment provided breakthroughs in the study of the Higgs-like
boson properties. One is the measurement of the width from an interplay between the off-shell and
on-shell production, setting a limit three orders of magnitude tighter than previous limits. The
other is the tensor structure measurement of the bosons interactions with pairs of vector bosons,
leading to constraints on its spin-parity properties, where only limited measurements had been done
before. Both of these breakthroughs provide further conformation that CMS has discovered a Higgs
boson near 125GeV.