Prof. Daniela Bortoletto (University of Oxford (GB))
The measurement of Higgs pair production will be a cornerstone of the LHC program in the coming years. Double Higgs production provides a crucial window upon the mechanism of electroweak symmetry breaking and has a unique sensitivity to the Higgs trilinear coupling. We study the feasibility of a measurement of Higgs pair production in the bbbb final state at the LHC. Our analysis is based on a combination of traditional cut- based methods with state-of-the-art multivariate techniques. We account for all relevant backgrounds, including the contributions from light and charm jet mis-identfication, which are ultimately comparable in size to the irreducible 4b QCD background. We demonstrate the robustness of our analysis strategy in a high pileup environment. For an integrated luminosity of L = 3 ab-1, a signal signficance of S/B~3 is obtained, indicating that the bbbb final state alone could allow for the observation of double Higgs production at the High Luminosity LHC. We also fund that, provided light jet mis-identification can be reduced, the signal significance could be increased up to the discovery level.
Cigdem Issever (University of Oxford (GB)) Prof. Daniela Bortoletto (University of Oxford (GB)) James Frost (University of Oxford (GB)) Janna Katharina Behr (Deutsches Elektronen-Synchrotron (DE)) Nathan Hartland (University of Oxford) Dr Rojo Juan (University of Oxford)