Aachen 2019 – scientific programme
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T: Fachverband Teilchenphysik
T 28: Higgs-Zerfälle in Fermionen I
T 28.2: Talk
Tuesday, March 26, 2019, 16:20–16:35, H04
Search for pair production of Higgs bosons decaying to bbτ+τ− with the ATLAS detector — •Christopher Deutsch, Alessandra Betti, Tatjana Lenz, Norbert Wermes, and Jochen Dingfelder — Physikalisches Institut, Bonn
The discovery of the Higgs boson and the measurement of its properties confirming the Standard Model (SM) is a major step towards the understanding of electroweak symmetry breaking. As a result, the potential of the Higgs field, and therefore the trilinear self-coupling of the Higgs boson, is precisely predicted in the SM. It can be probed by measuring the cross section of Higgs boson pair production, offering an additional test of the SM. In the SM such measurements are difficult due to the destructive interference of processes containing the self-coupling and processes with Yukawa couplings to top quarks, leading to a small production cross section at the Large Hadron Collider (LHC). An enhancement would indicate the presence of physics beyond the Standard Model (BSM), since heavy resonances decaying into pairs of Higgs bosons are predicted by several BSM models.
A search for non-resonant and resonant Higgs boson pair production in the bbτ+τ− channel is presented. This channel is one of the most sensitive for probing the Higgs self-coupling. The talk will focus on the subchannel with two hadronically decaying tau leptons. New developments towards the analysis of the ∼ 140 fb−1 dataset collected by the ATLAS experiment in Run 2 of the LHC are presented. These include improvements in object selection with new particle identification algorithms and using multivariate methods for signal selection.