Search for H→ cc and measurement of H→ bb in vector-boson fusion production with the ATLAS Detector
Abstract
A search for Standard Model (SM) Higgs bosons produced via vector-boson fusion at the Large Hadron Collider and decaying into a charm quark-antiquark pair (H→ cc) is presented. The datasets used correspond to integrated luminosities of 37.5 fb-1 and 51.5 fb-1 and were collected by the ATLAS detector from proton-proton collisions at s=13 and 13.6 TeV, respectively. The observed (expected) upper limit on the H→ cc production cross-section times branching ratio is 41 (28) times the SM prediction at 95% confidence level. Combining this search with the previous H→ cc search in associated production with a W or Z boson yields an observed (expected) limit on the Higgs-charm Yukawa coupling modifier of |c| < 4.7 (3.9). Higgs bosons decaying into a bottom quark-antiquark pair (H→ bb) are measured simultaneously using the 51.5 fb-1 dataset at s=13.6 TeV, with an observed signal strength of 0.97+0.57-0.50 relative to the SM expectation. When combined with previous H→ bb results at 13 TeV, the observed (expected) significance reaches 3.2 (3.6) standard deviations, providing evidence for H→ bb events from vector-boson fusion.
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