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Dark Matter signals at the LHC from a 3HDM

Dark Matter signals at the LHC from a 3HDM
Dark Matter signals at the LHC from a 3HDM

We analyse new signals of Dark Matter (DM) at the Large Hadron Collider (LHC) in a 3-Higgs Doublet Model (3HDM) where only one doublet acquires a Vacuum Expectation Value (VEV), preserving a parity Z2. The other two doublets are inert and do not develop a VEV, leading to a dark scalar sector controlled by Z2, with the lightest CP-even dark scalar H1 being the DM candidate. This leads to the loop induced decay of the next-to-lightest scalar, H2→ H1ff¯ (f= u, d, c, s, b, e, μ, τ) , mediated by both dark CP-odd and charged scalars. This is a smoking-gun signal of the 3HDM since it is not allowed in the 2HDM with one inert doublet and is expected to be important when H2 and H1 are close in mass. In practice, this signature can be observed in the cascade decay of the SM-like Higgs boson, h→ H1H2→ H1H1ff¯ into two DM particles and di-leptons/di-jets, where h is produced from either gluon-gluon Fusion (ggF) or Vector Boson Fusion (VBF). However, this signal competes with the tree-level channel qq¯ → H1H1Z→ H1H1ff¯. We devise some benchmarks, compliant with collider, DM and cosmological data, for which the interplay between these modes is discussed. In particular, we show that the resulting detector signature, [InlineMediaObject not available: see fulltext.], with invariant mass of ff¯ much smaller than mZ, can potentially be extracted already during Run 2 and 3. For example, the H2 → H1γ* and γ* → e+e case will give a spectacular QED mono-shower signal.

Beyond Standard Model, Dark matter, Hadron-Hadron scattering (experiments), Higgs physics
1126-6708
Cordero, A.
18e7d36c-f706-46d9-869a-42e8faa4c823
Hernandez-Sanchez, J.
1559f21d-dc8f-4616-93b3-44ed3ecd32ff
Keus, V.
f56212de-96d7-4955-8c56-561910f7f167
King, S.F.
f8c616b7-0336-4046-a943-700af83a1538
Moretti, S.
b57cf0f0-4bc3-4e02-96e3-071255366614
Rojas, D.
55118d87-8b05-48de-bcfc-a3d7bb7c13b4
Sokolowska, D.
22a8f2fc-000d-4a70-a0c8-bb0982631654
Cordero, A.
18e7d36c-f706-46d9-869a-42e8faa4c823
Hernandez-Sanchez, J.
1559f21d-dc8f-4616-93b3-44ed3ecd32ff
Keus, V.
f56212de-96d7-4955-8c56-561910f7f167
King, S.F.
f8c616b7-0336-4046-a943-700af83a1538
Moretti, S.
b57cf0f0-4bc3-4e02-96e3-071255366614
Rojas, D.
55118d87-8b05-48de-bcfc-a3d7bb7c13b4
Sokolowska, D.
22a8f2fc-000d-4a70-a0c8-bb0982631654

Cordero, A., Hernandez-Sanchez, J., Keus, V., King, S.F., Moretti, S., Rojas, D. and Sokolowska, D. (2018) Dark Matter signals at the LHC from a 3HDM. Journal of High Energy Physics, 2018 (5), [30]. (doi:10.1007/JHEP05(2018)030).

Record type: Article

Abstract

We analyse new signals of Dark Matter (DM) at the Large Hadron Collider (LHC) in a 3-Higgs Doublet Model (3HDM) where only one doublet acquires a Vacuum Expectation Value (VEV), preserving a parity Z2. The other two doublets are inert and do not develop a VEV, leading to a dark scalar sector controlled by Z2, with the lightest CP-even dark scalar H1 being the DM candidate. This leads to the loop induced decay of the next-to-lightest scalar, H2→ H1ff¯ (f= u, d, c, s, b, e, μ, τ) , mediated by both dark CP-odd and charged scalars. This is a smoking-gun signal of the 3HDM since it is not allowed in the 2HDM with one inert doublet and is expected to be important when H2 and H1 are close in mass. In practice, this signature can be observed in the cascade decay of the SM-like Higgs boson, h→ H1H2→ H1H1ff¯ into two DM particles and di-leptons/di-jets, where h is produced from either gluon-gluon Fusion (ggF) or Vector Boson Fusion (VBF). However, this signal competes with the tree-level channel qq¯ → H1H1Z→ H1H1ff¯. We devise some benchmarks, compliant with collider, DM and cosmological data, for which the interplay between these modes is discussed. In particular, we show that the resulting detector signature, [InlineMediaObject not available: see fulltext.], with invariant mass of ff¯ much smaller than mZ, can potentially be extracted already during Run 2 and 3. For example, the H2 → H1γ* and γ* → e+e case will give a spectacular QED mono-shower signal.

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Accepted/In Press date: 18 April 2018
e-pub ahead of print date: 4 May 2018
Published date: May 2018
Keywords: Beyond Standard Model, Dark matter, Hadron-Hadron scattering (experiments), Higgs physics

Identifiers

Local EPrints ID: 421257
URI: http://eprints.soton.ac.uk/id/eprint/421257
ISSN: 1126-6708
PURE UUID: cbf83593-a14f-4e08-92d6-6ffd0c8e7d23

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Date deposited: 29 May 2018 16:30
Last modified: 07 Oct 2020 00:27

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