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T: Fachverband Teilchenphysik

T 9: Higgs: Erweiterte Modelle

T 9.2: Vortrag

Montag, 25. März 2019, 16:15–16:30, S07

Performance studies of advanced X→ bb tagging methods for searches of resonant di-Higgs boson production in the bbWW^* decay channel. — •Joshua Beirer, Kira Abeling, Jason Veatch, and Stan Lai — Georg-August-Universität Göttingen

The discovery of the Higgs boson in 2012 paved the way for the Higgs precision era at the LHC. With more data now available, it is increasingly important to search for extremely rare processes such as di-Higgs boson production, which would allow for a direct test of the Higgs mechanism. Furthermore, several beyond the Standard Model theories predict heavy resonances that can decay into two Higgs bosons and would enhance the di-Higgs boson production cross section. For resonant masses in the TeV mass range, the decay products are highly-boosted and appear very close to each other in the detector such that they cannot be resolved individually. Instead, hadronic decay products are collected in large R-jets such that the constituents can be studied using substructure information.

In order to exploit the large H→ bb branching ratio, sophisticated methods for boosted bb tagging are crucial. For this purpose, the Higgs boson is reconstructed as a large R-jet and associated small R-jets are used to identify the individual b-hadrons. In this talk, the performance of several new subjet tagging techniques in the X→ HH→ bbWW^* channel is presented, which are aimed to considerably improve the tagging in boosted topologies.