Reinterpreting ATLAS Dijet and Supersymmetry Searches in A Baryon-Number-Violating Heavy Scalar Framework

A reinterpretation of ATLAS searches targeting $b$-tagged dijet resonances and monotop-alike signatures at a center-of-mass energy of 13 TeV is presented using $pp$ collision data corresponding to integrated luminosities of 139 ${\mathrm{f}\mathrm{b}}^{-1}$. These searches are used to constrain a baryon-number-violating new physics model that introduces two scalar mediators $X_1$ and $X_2$ to simultaneously address the baryon asymmetry of the universe and the dark matter relic abundance. By exploiting heavy-flavor signatures and allowing for jet-rich final states, this reinterpretation provides complementary sensitivity to the model relative to non-flavor-tagged inclusive dijet searches and conventional monotop reinterpretations. Assuming the mediators decay either into a pair of down-type quarks or into a top quark and a dark matter candidate, we translate the experimental upper limits into the model’s parameter space. 95% confidence level exclusion limits are derived in the ${\lambda }_1$-${\lambda }_2$ coupling plane for benchmark mediator masses of 1.5, 1.75, and 2.0 TeV. For all three benchmark masses, the $b$-tagged dijet reinterpretation excludes ${\lambda }_1>0.45$, while the bottom-squark reinterpretation excludes the region with ${\lambda }_1>0.3$ and ${\lambda }_2>0.6$, within the respective validated parameter domains.