Potential of di-Higgs observation via a calibratable jet-free $HH\to 4b$ framework

Abstract

We present a calibratable, jet-free framework that enhances the search significance of the flagship LHC channel $HH\to 4b$ by more than a factor of five compared to existing approaches. The method employs a mass-decorrelated discriminant to identify $h_1{h}_2\to 4b$ with variable $h_{1,2}$ masses and a simultaneous estimator of $(m_{h_1},m_{h_2})$, both derived from multiclass classification on all-particle inputs. The $HH$ signal response can be calibrated using $ZZ\to 4b$. 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 ${\kappa }_{\lambda }$ comparable to HL-LHC projections and offering an accelerated path to precision measurements of the Higgs trilinear coupling.

Comments: 7 pages, 3 figures, 1 table. Feedback appreciated (via alphaXiv)