Search for non-resonant di-Higgs production to the bb(tau)(tau) final state using a Committee Machine with the ATLAS detector at the LHC using pp collisions at 13 TeV

Zoom room for seminars: https://cern.zoom.us/j/98750947196?pwd=N1RTS3EzazBha0tURVJOcEZKREFxZz09

Meeting ID: 987 5094 7196

Passcode: 613113



Abstract:

The race to measure di-Higgs production at the LHC (if existing in nature), with the possibility to extract information about the shape of the Higgs potential, is an ongoing and exciting one. A search for non-resonant Higgs boson pair-production decaying to two bottom quarks and two tau leptons using a Committee Machine is presented. The search uses 36.1 inverse fb of data with a centre of mass energy of 13 TeV, recorded with the ATLAS detector at the LHC in 2015 and 2016. No significant excess above the expected background is observed in the data for the non-resonant Higgs boson pair-production, constraining its cross-section times branching ratio to be less than 57.78 (101.30) fb for the expected (observed) categories, respectively corresponding to 23.67 (41.49) times the Standard Model expectation prediction at 95% confidence level, a stricter limit (for the expected value) in comparison with the non-committee result. The Committee machine approach is 16.9% better that the published decision tree approach, showing that a multi-classifier approach is a good strategy for a full Run 2 analysis.