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T: Fachverband Teilchenphysik

T 51: Suche nach Physik jenseits des Standardmodels III

T 51.2: Vortrag

Mittwoch, 21. März 2018, 16:50–17:05, Philo-HS4

First search for single production of vector-like B quarks in the B → bH decay channel with H → γγ with the ATLAS detector at √s = 13 TeV — •Björn Wendland¹, Frederic Schröder², Isabel Nitsche¹, Diane Cinca¹, Johannes Erdmann¹, and Kevin Kröninger¹ — ¹TU Dortmund, Experimentelle Physik IV — ²Bergische Universität Wuppertal

Vector-like quarks are the simplest extension of the Standard Model of particle physics (SM) with color charged fermions that is still allowed by data. The single production of vector-like B quarks, which is favored over the pair production at high masses, is considered in this analysis.
The decay of a singly produced B into a b quark and a Higgs boson with H→ γγ is studied at the LHC for the first time using data taken with the ATLAS detector at a center-of-mass energy of 13 TeV. Although the H → γγ decay channel has a low branching ratio, this analysis benefits from the excellent mass resolution of the diphoton system.
The analysis strategy is based on the characteristic event topology with two photons with high transverse energy, one b-jet with high transverse momentum and one forward jet. The invariant mass of the B candidate is reconstructed from its decay products and used as discriminating variable against background. The main background contribution arises from non-resonant diphoton production with additional small contributions from SM Higgs boson production processes.