The Higgs-boson decay to two W bosons (H → WW) is the second most common decay mode after its decay to two b quarks.
Theoretical calculations of this process predict a branching fraction of 6.7–7.7 × 10–7.
LHCb has now made its first measurement of top quark production using Run-2 data collected in proton–proton collisions at the energy of 13 TeV.
The Higgs-to-two-photons decay played a crucial role in the discovery of the Higgs boson in 2012 owing to the excellent mass resolution and well-modelled backgrounds in this channel.
Tim Gershon of LHCb argues that apparently harmless academic discussions risk evolving into a negative outlook for the field.
In two new results, ATLAS presents strong evidence for the production of a single top quark in association with a Z boson.
No more than a few hundred tZq events and a dozen tttt events were expected after selection.
The coupling can be directly probed by measuring the rate of events in which a Higgs boson is produced in association with a pair of top quarks.
The Higgs boson decays to a pair of b quarks is by far the most frequent decay channel, however the signal is overwhelmed by QCD production.
While only retaining 40% of the events, the total uncertainty is improved by 19%, leading to a top-quark mass of 172.08±0.91 GeV.