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Single and double SM-like Higgs boson production at future electron-positron colliders in composite 2HDMs

Single and double SM-like Higgs boson production at future electron-positron colliders in composite 2HDMs
Single and double SM-like Higgs boson production at future electron-positron colliders in composite 2HDMs
We investigate single- and double-h , the discovered Standard Model (SM)-like Higgs boson, production at future e + e − colliders in Composite 2-Higgs Doublet Models (C2HDMs) and Elementary 2-Higgs Doublet Models (E2HDMs) with a softly-broken Z 2 symmetry. We first survey their parameter spaces allowed by theoretical bounds from perturbative unitarity and vacuum stability as well as by future data at the Large Hadron Collider (LHC) with an integrated luminosity up to 3000 fb −1 under the assumption that no new Higgs boson is detected. We then discuss how different the cross sections can be between the two scenarios when κ V , the hVV (V=W ± ,Z ) coupling normalised to the SM value, is taken to be the same value in the both scenario We find that if κ 2 V is found to be, e.g., 0.98 , then the cross sections in C2HDMs with f (the compositeness scale) in the TeV region can be maximally changed to be about −15% , −18% , −50% and −35% for the e + e − →tt ¯ h , e + e − →Zhh , e + e − →e + e − hh and e + e − →tt ¯ hh processes, respectively, with respect to those in E2HDMs. Thus, a future electron-positron collider has the potential to discriminate between E2HDMs and C2HDMs, even when only h event rates are measured.
hep-ph
2470-0010
Curtis, Stefania De
7bf1f7cf-535f-4551-8d05-806c57cfa2d1
Moretti, Stefano
b57cf0f0-4bc3-4e02-96e3-071255366614
Yagyu, Kei
ecd84785-710b-4526-8b41-55ae605e633c
Yildirim, Emine
d4349b7c-247c-41cf-9a8b-0d235e7628ae
Curtis, Stefania De
7bf1f7cf-535f-4551-8d05-806c57cfa2d1
Moretti, Stefano
b57cf0f0-4bc3-4e02-96e3-071255366614
Yagyu, Kei
ecd84785-710b-4526-8b41-55ae605e633c
Yildirim, Emine
d4349b7c-247c-41cf-9a8b-0d235e7628ae

Curtis, Stefania De, Moretti, Stefano, Yagyu, Kei and Yildirim, Emine (2017) Single and double SM-like Higgs boson production at future electron-positron colliders in composite 2HDMs. Physical Review D, 95, [095026]. (doi:10.1103/PhysRevD.95.095026).

Record type: Article

Abstract

We investigate single- and double-h , the discovered Standard Model (SM)-like Higgs boson, production at future e + e − colliders in Composite 2-Higgs Doublet Models (C2HDMs) and Elementary 2-Higgs Doublet Models (E2HDMs) with a softly-broken Z 2 symmetry. We first survey their parameter spaces allowed by theoretical bounds from perturbative unitarity and vacuum stability as well as by future data at the Large Hadron Collider (LHC) with an integrated luminosity up to 3000 fb −1 under the assumption that no new Higgs boson is detected. We then discuss how different the cross sections can be between the two scenarios when κ V , the hVV (V=W ± ,Z ) coupling normalised to the SM value, is taken to be the same value in the both scenario We find that if κ 2 V is found to be, e.g., 0.98 , then the cross sections in C2HDMs with f (the compositeness scale) in the TeV region can be maximally changed to be about −15% , −18% , −50% and −35% for the e + e − →tt ¯ h , e + e − →Zhh , e + e − →e + e − hh and e + e − →tt ¯ hh processes, respectively, with respect to those in E2HDMs. Thus, a future electron-positron collider has the potential to discriminate between E2HDMs and C2HDMs, even when only h event rates are measured.

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Single and double SM-like Higgs boson production at future electron-positron colliders in composite 2HDMs - Accepted Manuscript
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More information

Submitted date: 23 February 2017
Accepted/In Press date: 16 March 2017
e-pub ahead of print date: 30 May 2017
Published date: May 2017
Additional Information: 29 pages, 58 figures First available on ArXiv 23 Feb 2017
Keywords: hep-ph

Identifiers

Local EPrints ID: 412659
URI: http://eprints.soton.ac.uk/id/eprint/412659
ISSN: 2470-0010
PURE UUID: 5f354b61-fef0-4b8f-99ee-e279010d5b69

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Date deposited: 24 Jul 2017 16:33
Last modified: 06 Oct 2020 20:35

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