Speaker
Leonid Serkin
(INFN Gruppo Collegato di Udine and ICTP Trieste (IT))
Description
A search for the Standard Model Higgs boson produced in association with a pair of top quarks (ttH) and
decaying into a pair of bottom quarks (H→bb) is presented. The search is focused on the semileptonic
decay of the tt system and exploits different topologies given by the jet and b-tagged jet multiplicities
of the event. A neural network is used to discriminate between signal and background events,
the latter being dominated by tt+jets production. Using 20.3/fb of data at sqrt(s)=8 TeV collected
with the ATLAS detector during Run 1 of the Large Hadron Collider, we obtain an observed (expected)
95% confidence-level upper limit of 3.4 (2.2) times the Standard Model cross section for a Higgs
boson with a mass of 125 GeV.
Author
Leonid Serkin
(INFN Gruppo Collegato di Udine and ICTP Trieste (IT))
