The University of Southampton
University of Southampton Institutional Repository

Flavor physics and fine tuning in theory space

Flavor physics and fine tuning in theory space
Flavor physics and fine tuning in theory space
Recently a new class of composite Higgs models have been developed which give rise to naturally light Higgs bosons without supersymmetry. Based on the chiral symmetries of “theory space,” involving replicated gauge groups and appropriate gauge symmetry breaking patterns, these models allow the scale of the underlying strong dynamics giving rise to the composite particles to be as large as of order 10 TeV, without any fine tuning to prevent large corrections to Higgs boson mass(es) of order 100 GeV.
In this paper we show that the size of flavor violating interactions arising generically from underlying flavor dynamics constrains the scale of the Higgs boson compositeness to be greater than of order 75 TeV, implying that significant fine-tuning is required. Without fine-tuning, the low-energy structure of the composite Higgs model alone is not sufficient to eliminate potential problems with flavor-changing neutral currents or excessive CP violation; solving those problems requires additional information or assumptions about the symmetries of the underlying flavor or strong dynamics. We also consider the weaker, but more model-independent, bounds which arise from limits on weak isospin violation.
1550-7998
035008-[6pp]
Chivukula, R. Sekhar
18c2855f-65d6-4e48-a4db-d008d952d060
Evans, Nick
33dfbb52-64dd-4c1f-9cd1-074faf2be4b3
Simmons, Elizabeth H.
84221232-93b5-42d5-8c6f-e3b5c89eb351
Chivukula, R. Sekhar
18c2855f-65d6-4e48-a4db-d008d952d060
Evans, Nick
33dfbb52-64dd-4c1f-9cd1-074faf2be4b3
Simmons, Elizabeth H.
84221232-93b5-42d5-8c6f-e3b5c89eb351

Chivukula, R. Sekhar, Evans, Nick and Simmons, Elizabeth H. (2002) Flavor physics and fine tuning in theory space. Physical Review D, 66 (3), 035008-[6pp]. (doi:10.1103/PhysRevD.66.035008).

Record type: Article

Abstract

Recently a new class of composite Higgs models have been developed which give rise to naturally light Higgs bosons without supersymmetry. Based on the chiral symmetries of “theory space,” involving replicated gauge groups and appropriate gauge symmetry breaking patterns, these models allow the scale of the underlying strong dynamics giving rise to the composite particles to be as large as of order 10 TeV, without any fine tuning to prevent large corrections to Higgs boson mass(es) of order 100 GeV.
In this paper we show that the size of flavor violating interactions arising generically from underlying flavor dynamics constrains the scale of the Higgs boson compositeness to be greater than of order 75 TeV, implying that significant fine-tuning is required. Without fine-tuning, the low-energy structure of the composite Higgs model alone is not sufficient to eliminate potential problems with flavor-changing neutral currents or excessive CP violation; solving those problems requires additional information or assumptions about the symmetries of the underlying flavor or strong dynamics. We also consider the weaker, but more model-independent, bounds which arise from limits on weak isospin violation.

This record has no associated files available for download.

More information

Published date: 21 August 2002

Identifiers

Local EPrints ID: 28763
URI: http://eprints.soton.ac.uk/id/eprint/28763
ISSN: 1550-7998
PURE UUID: d294bd45-ec67-4dd6-a846-dd51d881e4e0

Catalogue record

Date deposited: 05 May 2006
Last modified: 15 Mar 2024 07:27

Export record

Altmetrics

Contributors

Author: R. Sekhar Chivukula
Author: Nick Evans
Author: Elizabeth H. Simmons

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.

×