Search for a new pseudoscalar decaying into a pair of bottom and antibottom quarks in top-associated production in s=13 TeV proton–proton collisions with the ATLAS detector

Search for a new pseudoscalar decaying into a pair of bottom and antibottom quarks in top-associated production in $\sqrt{s}$=13 TeV proton-proton collisions with the ATLAS detector http://arxiv.org/abs/2503.17254 ATLAS Collaboration

defined as the strength modifier of the Standard Model Yukawa coupling. [5/5 of https://arxiv.org/abs/2503.17254v1]

of pseudoscalar masses between 50 and 80 GeV is excluded at 95% confidence level for a coupling of the pseudoscalar to the top quark of 0.5, while a coupling of 1.0 is excluded at 95% confidence level for the masses considered, with the coupling [4/5 of…

reconstructed as two standard $b$-tagged small-radius jets, or merged into a large-radius jet due to its Lorentz boost. No significant excess relative to expectations is observed. Assuming a branching ratio BR($a\rightarrow b\bar{b}$)=100%, the range [3…