Würzburg 2018 – wissenschaftliches Programm
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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.