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Electroweak production of light scalar-pseudoscalar pairs from extended Higgs sectors

Electroweak production of light scalar-pseudoscalar pairs from extended Higgs sectors
Electroweak production of light scalar-pseudoscalar pairs from extended Higgs sectors
In models with extended Higgs sectors, it is possible that the Higgs boson discovered at the LHC is not the lightest one. We show that in a realistic model (the Type I 2-Higgs Doublet Model), when the sum of the masses of a light scalar and a pseudoscalar ($h$ and $A$) is smaller than the $Z$ boson mass, the Electroweak (EW) production of an $hA$ pair can dominate over QCD production by orders of magnitude, a fact not previously highlighted. This is because in the $gg$-initiated process, $hA$ production via a resonant $Z$ in the $s$-channel is prohibited according to the Landau-Yang theorem, which is not the case for the $q\bar{q}$-initiated process. We explore the parameter space of the model to highlight regions giving such $hA$ solutions while being consistent with all constraints from collider searches, $b$-physics and EW precision data. We also single out a few benchmark points to discuss their salient features, including the $hA$ search channels that can be exploited at Run II of the LHC.
hep-ph
0370-2693
121-125
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 (2017) Electroweak production of light scalar-pseudoscalar pairs from extended Higgs sectors. Physics Letters B, 764, 121-125. (doi:10.1016/j.physletb.2016.11.012).

Record type: Article

Abstract

In models with extended Higgs sectors, it is possible that the Higgs boson discovered at the LHC is not the lightest one. We show that in a realistic model (the Type I 2-Higgs Doublet Model), when the sum of the masses of a light scalar and a pseudoscalar ($h$ and $A$) is smaller than the $Z$ boson mass, the Electroweak (EW) production of an $hA$ pair can dominate over QCD production by orders of magnitude, a fact not previously highlighted. This is because in the $gg$-initiated process, $hA$ production via a resonant $Z$ in the $s$-channel is prohibited according to the Landau-Yang theorem, which is not the case for the $q\bar{q}$-initiated process. We explore the parameter space of the model to highlight regions giving such $hA$ solutions while being consistent with all constraints from collider searches, $b$-physics and EW precision data. We also single out a few benchmark points to discuss their salient features, including the $hA$ search channels that can be exploited at Run II of the LHC.

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Accepted/In Press date: 6 November 2016
e-pub ahead of print date: 10 November 2016
Published date: 10 January 2017
Additional Information: 5 pages, 3 figures. v2: References added, typos corrected, discussion slightly expanded. Main conclusions unchanged. Published in Physics Letters B
Keywords: hep-ph
Organisations: Theory Group

Identifiers

Local EPrints ID: 411857
URI: http://eprints.soton.ac.uk/id/eprint/411857
ISSN: 0370-2693
PURE UUID: 03c27bc6-b732-4cda-b66c-c4339926bf9c

Catalogue record

Date deposited: 27 Jun 2017 16:31
Last modified: 21 Nov 2021 07:16

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Contributors

Author: Rikard Enberg
Author: William Klemm
Author: Stefano Moretti
Author: Shoaib Munir

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