CERN Accelerating science

ATLAS Slides
Report number	ATL-PHYS-SLIDE-2022-362
Title	Measurement prospects for di-Higgs production in the HH to bbyy channel with the ATLAS experiment at the HL-LHC
Author(s)	Wang, Alex Zeng (University of Wisconsin Madison (US))
Corporate author(s)	The ATLAS collaboration
Collaboration	ATLAS Collaboration
Submitted to	41st International Conference on High Energy Physics (ICHEP 2022), Bologna, Italy, 6 - 13 Jul 2022, pp.ATL-PHYS-SLIDE-2022-362
Submitted by	[email protected] on 29 Jul 2022
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	HDBS ; HIGGS
Abstract	We present a prospect study on di-Higgs production in the HH→bbγγ decay channel with the ATLAS experiment at the High Luminosity LHC (HL-LHC). The results are obtained by extrapolating the results from the Run 2 measurement, with 139 fb−1 of data at a center-of-mass energy of 13 TeV, to the conditions expected at the HL-LHC. While there is no sign of di-Higgs production with the current LHC dataset, the much higher luminosity (3000 fb−1) and energy (14 TeV) at the HL-LHC will enable a much better measurement of this important process. We describe in detail the extrapolation process and assumptions, and multiple scenarios for the treatment of systematic uncertainties at the HL-LHC are considered. Under the baseline systematic uncertainty scenario, the extrapolated precision on the Standard Model di-Higgs signal strength measurement is 50%, corresponding to a significance of 2.2σ. The extrapolated 1σ confidence interval from a measurement of κλ, the trilinear Higgs boson self-coupling modifier, is [0.3, 1.9].