Speaker
Description
We present a calibratable, jet-free framework that enhances the search significance of the flagship LHC channel HH→4b by more than a factor of five compared to existing approaches. The method employs a mass-decorrelated discriminant to identify h1h2→4b with variable h1,2 masses and a simultaneous estimator of (mh1,mh2), both derived from multiclass classification on all-particle inputs. The HH signal response can be calibrated using ZZ→4b. Using a highly realistic simulation framework validated through multiple tests, we demonstrate the method's robustness and identify two prerequisites essential for achieving this level of sensitivity. Results indicate that with LHC Run 2 and 3 data, observation-level sensitivity to HH appears within reach, enabling constraints on κλ comparable to HL-LHC projections and offering an accelerated path to precision measurements of the Higgs trilinear coupling.