Standard model Higgs boson pair production in the (b ̄b)(b ̄b) final state

Measuring the Higgs boson couplings as precisely as possible is one of the major goals of the High Luminosity LHC. We show that the ()() final state in Higgs boson pair production can be exploited in the boosted regime to give constraints on the trilinear Higgs boson self-coupling. In these exclusive phase space regions, novel jet substructure techniques can be used to separate the signal from the large QCD and electroweak backgrounds. New developments on trigger and b-tagging strategies for the upcoming LHC runs are necessary in order to reconstruct the Higgs bosons in boosted final states, where the trilinear self-coupling sensitivity is reduced. We find that using our approach one can set a limit for 1 . 2 at 95% CL after 3000 fb-1. As the signal-to-background ratio is small, we propose a data-driven side-band analysis to improve on the coupling measurement. DOI: https://doi.org/10.1007/JHEP08(2014)030 Posted at the Zurich Open Repository and Archive, University of Zurich ZORA URL: https://doi.org/10.5167/uzh-107576 Journal Article Published Version The following work is licensed under a Creative Commons: Attribution 4.0 International (CC BY 4.0) License. Originally published at: de Lima, Danilo Enoque Ferreira; Papaefstathiou, Andreas; Spannowsky, Michael (2014). Standard model Higgs boson pair production in the (b ̄b)(b ̄b) final state. Journal of High Energy Physics:030. DOI: https://doi.org/10.1007/JHEP08(2014)030 J H E P 0 8 ( 2 0 1 4 ) 0 3 0 Published for SISSA by Springer Received: May 8, 2014 Revised: June 18, 2014 Accepted: July 9, 2014 Published: August 6, 2014 Standard model Higgs boson pair production in the (bb̄)(bb̄) final state Danilo Enoque Ferreira de Lima,a,c Andreas Papaefstathioub and Michael Spannowskyc School of Physics and Astronomy, University of Glasgow, University Avenue, Glasgow, United Kingdom Physik-Institut, Universität Zürich, Winterthurerstrasse 190, Zürich, Switzerland Institute for Particle Physics Phenomenology, Durham University, South Road, Durham, United Kingdom E-mail: dferreir@mail.cern. ch, andreasp@physik.uzh. ch, michael.spannowsky@durham.ac. uk Abstract: Measuring the Higgs boson couplings as precisely as possible is one of the major goals of the High Luminosity LHC. We show that the (bb̄)(bb̄) final state in Higgs boson pair production can be exploited in the boosted regime to give constraints on the trilinear Higgs boson self-coupling. In these exclusive phase space regions, novel jet substructure techniques can be used to separate the signal from the large QCD and electroweak backgrounds. New developments on trigger and b-tagging strategies for the upcoming LHC runs are necessary in order to reconstruct the Higgs bosons in boosted final states, where the trilinear self-coupling sensitivity is reduced. We find that using our approach one can set a limit for λ ≤ 1.2 at 95% CL after 3000 fb−1. As the signal-to-background ratio is small, we propose a data-driven side-band analysis to improve on the coupling measurement. Measuring the Higgs boson couplings as precisely as possible is one of the major goals of the High Luminosity LHC. We show that the (bb̄)(bb̄) final state in Higgs boson pair production can be exploited in the boosted regime to give constraints on the trilinear Higgs boson self-coupling. In these exclusive phase space regions, novel jet substructure techniques can be used to separate the signal from the large QCD and electroweak backgrounds. New developments on trigger and b-tagging strategies for the upcoming LHC runs are necessary in order to reconstruct the Higgs bosons in boosted final states, where the trilinear self-coupling sensitivity is reduced. We find that using our approach one can set a limit for λ ≤ 1.2 at 95% CL after 3000 fb−1. As the signal-to-background ratio is small, we propose a data-driven side-band analysis to improve on the coupling measurement.