Speaker
Description
The Higgs decay to pairs of muons is extremely rare, yet it still provides the best opportunity to measure Higgs couplings to the second generation fermions. A recent search using the ATLAS detector on the Large Hadron Collider has established evidence for this decay at the level of $3.4~\sigma$. In this search, events are categorized based on the production mode of the Higgs boson. One such category is the associated production of the Higgs with two top quarks ($t\bar{t}H$), which is one of the easiest to separate from background processes. This is due to the decay of the two top quarks, each of which provides additional information in the event. However, this additional information can sometimes cause ambiguity in the search, specifically when one of the top quark decays includes a muon. In these cases, it is not clear which two muons come from the Higgs, and which is from the top decay. The default strategy for selecting the Higgs candidate muons is inefficient in these cases, only recovering the correct muons 60% of the time. This talk investigates strategies for improving the selection of Higgs candidate muons in semileptonic $t\bar{t}H$ events which successfully recover the correct muons more than 90% of the time.
| Keyword-1 | Collider Physics |
|---|---|
| Keyword-2 | Higgs Boson |
| Keyword-3 | ATLAS Experiment |