Double Higgs production with the CMS experiment at the LHC

by Alessandro Calandri (Università & INFN, Firenze (IT))

Monday 1 Jun 2026, 14:30 → 16:00 Europe/Rome

The measurement of Higgs boson pair (HH) production provides a direct probe of the Higgs self-coupling and is a cornerstone of the LHC physics programme. In this seminar, I will present an overview of recent HH analyses performed by the CMS experiment using Run 3 proton-proton collision data collected at the CERN Large Hadron Collider. The talk will highlight the latest Run 3 results in the HH→4b, HH→bbγγ, HH→bbtt and HH→bbWW final states. Particular emphasis is given on the performance of flavour tagging algorithms for resolved or merged-jet topologies, which are critical for identifying bottom- and charm-quark jets. I will discuss the evolution of flavour tagging techniques in the Run 3 environment, including improvements in detector conditions, tracking, and machine-learning-based taggers and their impact on signal sensitivity. The implications of these results for current and future HH analyses are highlighted, underscoring the central role of robust flavour tagging in precision HH analyses.