Higgs self-coupling measurements using deep learning in the $ b\overline{b}b\overline{b} $ final state
Jacob Amacker, W. K. Balunas, Michael Spannowsky, B. Stanislaus, L. Beresford, D. Bortoletto, J. A. Frost, Ç. İşsever, J. K. K. Liu, James McKee, Alessandro Micheli, Stanislaus, Beojan
Abstract
Measuring the Higgs trilinear self-coupling λ$_{hhh}$ is experimentally demanding but fundamental for understanding the shape of the Higgs potential. We present a comprehensive analysis strategy for the HL-LHC using di-Higgs events in the four b-quark channel (hh → 4b), extending current methods in several directions. We perform deep learning to suppress the formidable multijet background with dedicated optimisation for BSM λ$_{hhh}$ scenarios. We compare the λ$_{hhh}$ constraining power of events using different multiplicities of large radius jets with a two-prong structure that reconstruct boosted h → bb decays. We show that current uncertainties in the SM top Yukawa coupling y$_{t}$ can modify λ$_{hhh}$ constraints by ∼ 20%. For SM y$_{t}$, we find prospects of −0.8 <$ {\lambda}_{hhh}/{\lambda}_{hhh}^{\mathrm{SM}} $< 6.6 at 68% CL under simplified assumptions for 3000 fb$^{−1}$ of HL-LHC data. Our results provide a careful assessment of di-Higgs identification and machine learning techniques for all-hadronic measurements of the Higgs self-coupling and sharpens the requirements for future improvement.