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Electroweak production of multiple (pseudo)scalars in the 2HDM

Electroweak production of multiple (pseudo)scalars in the 2HDM
Electroweak production of multiple (pseudo)scalars in the 2HDM

The two-Higgs Doublet Model (2HDM) is the most minimal extension of the Standard Model (SM) containing extra Higgs doublet fields. Given the multiplicity of Higgs states in a 2HDM, its Higgs potential is significantly more involved than the SM one. Importantly, it contains a multitude of Higgs triple self-couplings, unlike the SM, which only has one. These interactions are key to understanding the phenomenology of the 2HDM, as they uniquely determine the form of the potential. Several studies analysing the prospects of measuring these couplings at the Large Hadron Collider (LHC) have found them to be quite low generally. However, such studies have largely concentrated on Higgs pair-production induced by gluon-gluon scattering, either via direct annihilation or followed by their splitting into b-(anti)quark pairs, which in turn annihilate leaving behind spectator b-(anti)quarks. Both of these channels are therefore governed by QCD dynamics. We compare here the yields of such channels to those initiated by (primarily) valence quarks, which involve Electro-Weak (EW) interactions only, for neutral multi-Higgs final states. We find that EW production can be dominant over QCD production for certain final state combinations. We also illustrate that charged final states, which can only be produced via EW modes, could serve as important probes of some H± triple couplings, that are inaccessible in QCD-induced processes, during Run 2 and 3 of the LHC. Our analysis covers regions of the parameter space of the Type-I 2HDM that have escaped the most up-to-date experimental constraints coming from EW precision data, LHC measurements of the 125 GeV Higgs boson properties, searches for additional Higgs states, and flavour physics.

1434-6044
1-12
Enberg, Rikard
ec453f82-1f21-4dd7-9ad6-ff39b1a0c895
Klemm, William
544edc9f-d55c-410a-a189-81dbf320c0e8
Moretti, Stefano
b57cf0f0-4bc3-4e02-96e3-071255366614
Munir, Shoaib
9e440f1d-64a4-4f6c-9b55-6c13bb544dcd
Enberg, Rikard
ec453f82-1f21-4dd7-9ad6-ff39b1a0c895
Klemm, William
544edc9f-d55c-410a-a189-81dbf320c0e8
Moretti, Stefano
b57cf0f0-4bc3-4e02-96e3-071255366614
Munir, Shoaib
9e440f1d-64a4-4f6c-9b55-6c13bb544dcd

Enberg, Rikard, Klemm, William, Moretti, Stefano and Munir, Shoaib (2019) Electroweak production of multiple (pseudo)scalars in the 2HDM. European Physical Journal C, 79 (6), 1-12, [512]. (doi:10.1140/epjc/s10052-019-7025-8).

Record type: Article

Abstract

The two-Higgs Doublet Model (2HDM) is the most minimal extension of the Standard Model (SM) containing extra Higgs doublet fields. Given the multiplicity of Higgs states in a 2HDM, its Higgs potential is significantly more involved than the SM one. Importantly, it contains a multitude of Higgs triple self-couplings, unlike the SM, which only has one. These interactions are key to understanding the phenomenology of the 2HDM, as they uniquely determine the form of the potential. Several studies analysing the prospects of measuring these couplings at the Large Hadron Collider (LHC) have found them to be quite low generally. However, such studies have largely concentrated on Higgs pair-production induced by gluon-gluon scattering, either via direct annihilation or followed by their splitting into b-(anti)quark pairs, which in turn annihilate leaving behind spectator b-(anti)quarks. Both of these channels are therefore governed by QCD dynamics. We compare here the yields of such channels to those initiated by (primarily) valence quarks, which involve Electro-Weak (EW) interactions only, for neutral multi-Higgs final states. We find that EW production can be dominant over QCD production for certain final state combinations. We also illustrate that charged final states, which can only be produced via EW modes, could serve as important probes of some H± triple couplings, that are inaccessible in QCD-induced processes, during Run 2 and 3 of the LHC. Our analysis covers regions of the parameter space of the Type-I 2HDM that have escaped the most up-to-date experimental constraints coming from EW precision data, LHC measurements of the 125 GeV Higgs boson properties, searches for additional Higgs states, and flavour physics.

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Enberg 2019 Article Electroweak Production - Version of Record
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More information

Accepted/In Press date: 31 May 2019
e-pub ahead of print date: 15 June 2019
Published date: June 2019

Identifiers

Local EPrints ID: 432093
URI: http://eprints.soton.ac.uk/id/eprint/432093
ISSN: 1434-6044
PURE UUID: cbdd713c-9b6f-496b-ba5c-4e2fa91549db

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Date deposited: 02 Jul 2019 16:30
Last modified: 07 Oct 2020 00:31

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