The University of Southampton
University of Southampton Institutional Repository

Singlets in composite Higgs models in light of the LHC 750 GeV diphoton excess

Singlets in composite Higgs models in light of the LHC 750 GeV diphoton excess
Singlets in composite Higgs models in light of the LHC 750 GeV diphoton excess
Models of compositeness can successfully address the origin of the Higgs boson, as a pseudo-Nambu-Goldstone boson (pNGB) of a spontaneously broken global symmetry, and flavor physics via the partial compositeness mechanism. If the dynamics is generated by a confining gauge group with fermionic matter content, there exists only a finite set of models that have the correct properties to account for the Higgs and top partners at the same time. In this paper, we explore the theory space of this class of models; remarkably, all of them contain—beyond the pNGB Higgs—a pNGB singlet, a, which couples to Standard Model gauge bosons via Wess-Zumino-Witten interactions, thus providing naturally a resonance in the diboson at the LHC. With the assumption that the recently reported diphoton excess at 750 GeV at the LHC arises from the a resonance, we propose a generic approach on how to delineate the best candidate for composite Higgs models with top partners. We find that constraints from other diboson searches severely reduce the theory space of the models under consideration. For the models which can explain the diphoton excess, we make precise and testable predictions for the width and other diboson resonance searches.
1550-7998
015004
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3
Cacciapaglia, Giacomo
380b5956-ae5a-48ca-8079-0b477da50014
Cai, Haiying
746a151b-b40e-461b-89c1-5165e0a8fa01
Flacke, Thomas
15314cdc-3890-4986-afe0-d3da8b6c81f3
Parolini, Alberto
49aba9e0-0c5c-4e70-8269-a024b707aa02
Serôdio, Hugo
48ec0627-2acb-4437-ba7c-a1647bf3d471
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3
Cacciapaglia, Giacomo
380b5956-ae5a-48ca-8079-0b477da50014
Cai, Haiying
746a151b-b40e-461b-89c1-5165e0a8fa01
Flacke, Thomas
15314cdc-3890-4986-afe0-d3da8b6c81f3
Parolini, Alberto
49aba9e0-0c5c-4e70-8269-a024b707aa02
Serôdio, Hugo
48ec0627-2acb-4437-ba7c-a1647bf3d471

Belyaev, Alexander, Cacciapaglia, Giacomo, Cai, Haiying, Flacke, Thomas, Parolini, Alberto and Serôdio, Hugo (2016) Singlets in composite Higgs models in light of the LHC 750 GeV diphoton excess. Physical Review D, 94 (15004), 015004. (doi:10.1103/PhysRevD.94.015004).

Record type: Article

Abstract

Models of compositeness can successfully address the origin of the Higgs boson, as a pseudo-Nambu-Goldstone boson (pNGB) of a spontaneously broken global symmetry, and flavor physics via the partial compositeness mechanism. If the dynamics is generated by a confining gauge group with fermionic matter content, there exists only a finite set of models that have the correct properties to account for the Higgs and top partners at the same time. In this paper, we explore the theory space of this class of models; remarkably, all of them contain—beyond the pNGB Higgs—a pNGB singlet, a, which couples to Standard Model gauge bosons via Wess-Zumino-Witten interactions, thus providing naturally a resonance in the diboson at the LHC. With the assumption that the recently reported diphoton excess at 750 GeV at the LHC arises from the a resonance, we propose a generic approach on how to delineate the best candidate for composite Higgs models with top partners. We find that constraints from other diboson searches severely reduce the theory space of the models under consideration. For the models which can explain the diphoton excess, we make precise and testable predictions for the width and other diboson resonance searches.

Text
THEORY Belyaev REF 1.pdf - Accepted Manuscript
Download (150kB)

More information

Accepted/In Press date: 28 April 2016
e-pub ahead of print date: 5 July 2016
Published date: 5 July 2016
Organisations: Physics & Astronomy

Identifiers

Local EPrints ID: 402043
URI: http://eprints.soton.ac.uk/id/eprint/402043
ISSN: 1550-7998
PURE UUID: 43e5e999-98e0-4f64-a92b-8660d6baecc7
ORCID for Alexander Belyaev: ORCID iD orcid.org/0000-0002-1733-4408

Catalogue record

Date deposited: 27 Oct 2016 09:06
Last modified: 17 Dec 2019 01:44

Export record

Altmetrics

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×