Aachen 2019 – scientific programme
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T: Fachverband Teilchenphysik
T 5: Suche nach Neuen Teilchen I
T 5.2: Talk
Monday, March 25, 2019, 16:20–16:35, H07
First search for single production of vector-like B quarks in the B → bH (→ γγ) decay channel with the ATLAS detector at √s = 13 TeV — •Björn Wendland1, Frederic Schröder2, Isabel Nitsche1, Diane Cinca1, Elizabeth Brost3, Johannes Erdmann1, Jahred Adelman3, and Kevin Kröninger1 — 1TU Dortmund, Experimentelle Physik IV — 2Bergische Universität Wuppertal — 3Northern Illinois University
The first search for the single production of vector-like B quarks decaying into a b quark and a Higgs boson where the Higgs boson decays into a pair of photons is presented.
The analysis strategy is based on the characteristic B quark event topology, which consists of two high-momentum photons, a high-momentum b-jet and a more forwardly produced jet. The B quark is reconstructed from its decay products and its reconstructed mass is used as final discriminant against background contributions. The dominant background contribution arises from non-resonant diphoton processes with additional jets in the final-state, where the photons arise either from Standard Model (SM) diphoton production or from jets mis-identified as photons. Additional small background contributions arise from SM Higgs boson production processes where the Higgs boson decays into a pair of photons.
No significant excess over the background-only hypothesis is observed. Assuming the (B, Y) doublet model and a generalized coupling κB = 0.5 of the B quark to SM quarks, B quark masses below 1210 GeV are excluded at 95 % confidence level.