Resonant di-Higgs boson production in the b¯bWW channel: Probing the electroweak phase transition at the LHC
We analyze the prospects for resonant di-Higgs production searches at the LHC in the b¯bW+W− (W+→ℓ+ν_ℓ, W−→ℓ−¯ν_ℓ) channel, as a probe of the nature of the electroweak phase transition in Higgs portal extensions of the Standard Model. In order to maximize the sensitivity in this final state, we develop a new algorithm for the reconstruction of the b¯bW+W− invariant mass in the presence of neutrinos from the W decays, building from a technique developed for the reconstruction of resonances decaying to τ+τ− pairs. We show that resonant di-Higgs production in the b¯bW+W−channel could be a competitive probe of the electroweak phase transition already with the data sets to be collected by the CMS and ATLAS experiments in run 2 of the LHC. The increase in sensitivity with larger amounts of data accumulated during the high-luminosity LHC phase can be sufficient to enable a potential discovery of the resonant di-Higgs production in this channel.
Additional Information© 2017 American Physical Society. Received 5 February 2017; published 11 August 2017. We thank Andreas Papaefstathiou for support with Herwig++. A. S. and T. H. are supported in part by U.S. Department of Energy Grant No. DE-SC0010813. A. S. and L. P. are supported in part by Qatar National Research Foundation Grant No. NPRP9-328-1-066. M. J. R. M. and P. W. are supported in part under U.S. Department of Energy Contract No. DE-SC0011095. J. M. N. is supported in part by the People Programme (Marie Curie Actions) of the European Union Seventh Framework Programme (No. FP7/2007-2013), by REA Grant Agreement No. PIEF-GA-2013-625809, and by the European Research Council under the European Unions Horizon 2020 program (ERC Grant Agreement No. 648680 DARKHORIZONS). J. M. N., M. J. R. M., M. S., and P. W. thank the Munich Institute for Astro- and Particle Physics (MIAPP), where a portion of this work has been completed. M. S. is supported in part by the European Commission through the "HiggsTools" Initial Training Network No. PITN-GA-2012-316704. Finally, we thank the CMS Collaboration for making Delphes available.
Published - PhysRevD.96.035007.pdf