Reducing the fine-tuning of gauge-mediated SUSY breaking

Despite their appealing features, models with gauge-mediated supersymmetry breaking (GMSB) typically present a high degree of fine-tuning, due to the initial absence of the top trilinear scalar couplings, At = 0. In this paper, we carefully evaluate such a tuning, showing that is worse than per mil...

Descripción completa

Detalles Bibliográficos
Autores: Casas, José Alberto, Moreno, J. M., Robles, S., Rolbiecki, K.
Tipo de recurso: artículo
Fecha de publicación:2016
País:España
Institución:Universidad Autónoma de Madrid
Repositorio:Biblos-e Archivo. Repositorio Institucional de la UAM
Idioma:español
OAI Identifier:oai:repositorio.uam.es:10486/677922
Acceso en línea:http://hdl.handle.net/10486/677922
https://dx.doi.org/10.1140/epjc/s10052-016-4305-4
Access Level:acceso abierto
Palabra clave:Gauge-mediated
GMSB
Fine-tuning
Física
id ES_5247bead0b65db4d2cd5231e233de636
oai_identifier_str oai:repositorio.uam.es:10486/677922
network_acronym_str ES
network_name_str España
repository_id_str
spelling Reducing the fine-tuning of gauge-mediated SUSY breakingCasas, José AlbertoMoreno, J. M.Robles, S.Rolbiecki, K.Gauge-mediatedGMSBFine-tuningFísicaDespite their appealing features, models with gauge-mediated supersymmetry breaking (GMSB) typically present a high degree of fine-tuning, due to the initial absence of the top trilinear scalar couplings, At = 0. In this paper, we carefully evaluate such a tuning, showing that is worse than per mil in the minimal model. Then, we examine some existing proposals to generate At ≠ 0 term in this context. We find that, although the stops can be made lighter, usually the tuning does not improve (it may be even worse), with some exceptions, which involve the generation of At at one loop or tree level. We examine both possibilities and propose a conceptually simplified version of the latter; which is arguably the optimum GMSB setup (with minimal matter content), concerning the fine-tuning issue. The resulting fine-tuning is better than one per mil, still severe but similar to other minimal supersymmetric standard model constructions. We also explore the so-called “little A2t /m2 problem”, i.e. the fact that a large At -term is normally accompanied by a similar or larger sfermion mass, which typically implies an increase in the fine-tuning. Finally, we find the version of GMSB for which this ratio is optimized, which, nevertheless, does not minimize the fine-tuningThis work has been partially supported by the MICINN, Spain, under contract FPA2013-44773-P, Consolider-Ingenio CPAN CSD2007-00042, as well as MULTIDARK CSD2009-00064. We also thank the Spanish MINECO Centro de excelencia Severo Ochoa Program under Grant SEV-2012-0249. S.R. is supported by the Campus of Excellence UAM+CSIC and K.R. by the Spanish Research Council (CSIC) within the JAE-Doc programSpringer New York LLCDepartamento de Física TeóricaFacultad de Ciencias20162016-08-11research articlehttp://purl.org/coar/resource_type/c_2df8fbb1VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/mswordhttp://hdl.handle.net/10486/677922https://dx.doi.org/10.1140/epjc/s10052-016-4305-4reponame:Biblos-e Archivo. Repositorio Institucional de la UAMinstname:Universidad Autónoma de MadridEspañolspaopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:repositorio.uam.es:10486/6779222026-06-23T12:46:27Z
dc.title.none.fl_str_mv Reducing the fine-tuning of gauge-mediated SUSY breaking
title Reducing the fine-tuning of gauge-mediated SUSY breaking
spellingShingle Reducing the fine-tuning of gauge-mediated SUSY breaking
Casas, José Alberto
Gauge-mediated
GMSB
Fine-tuning
Física
title_short Reducing the fine-tuning of gauge-mediated SUSY breaking
title_full Reducing the fine-tuning of gauge-mediated SUSY breaking
title_fullStr Reducing the fine-tuning of gauge-mediated SUSY breaking
title_full_unstemmed Reducing the fine-tuning of gauge-mediated SUSY breaking
title_sort Reducing the fine-tuning of gauge-mediated SUSY breaking
dc.creator.none.fl_str_mv Casas, José Alberto
Moreno, J. M.
Robles, S.
Rolbiecki, K.
author Casas, José Alberto
author_facet Casas, José Alberto
Moreno, J. M.
Robles, S.
Rolbiecki, K.
author_role author
author2 Moreno, J. M.
Robles, S.
Rolbiecki, K.
author2_role author
author
author
dc.contributor.none.fl_str_mv Departamento de Física Teórica
Facultad de Ciencias
dc.subject.none.fl_str_mv Gauge-mediated
GMSB
Fine-tuning
Física
topic Gauge-mediated
GMSB
Fine-tuning
Física
description Despite their appealing features, models with gauge-mediated supersymmetry breaking (GMSB) typically present a high degree of fine-tuning, due to the initial absence of the top trilinear scalar couplings, At = 0. In this paper, we carefully evaluate such a tuning, showing that is worse than per mil in the minimal model. Then, we examine some existing proposals to generate At ≠ 0 term in this context. We find that, although the stops can be made lighter, usually the tuning does not improve (it may be even worse), with some exceptions, which involve the generation of At at one loop or tree level. We examine both possibilities and propose a conceptually simplified version of the latter; which is arguably the optimum GMSB setup (with minimal matter content), concerning the fine-tuning issue. The resulting fine-tuning is better than one per mil, still severe but similar to other minimal supersymmetric standard model constructions. We also explore the so-called “little A2t /m2 problem”, i.e. the fact that a large At -term is normally accompanied by a similar or larger sfermion mass, which typically implies an increase in the fine-tuning. Finally, we find the version of GMSB for which this ratio is optimized, which, nevertheless, does not minimize the fine-tuning
publishDate 2016
dc.date.none.fl_str_mv 2016
2016-08-11
dc.type.none.fl_str_mv research article
http://purl.org/coar/resource_type/c_2df8fbb1
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10486/677922
https://dx.doi.org/10.1140/epjc/s10052-016-4305-4
url http://hdl.handle.net/10486/677922
https://dx.doi.org/10.1140/epjc/s10052-016-4305-4
dc.language.none.fl_str_mv Español
spa
language_invalid_str_mv Español
language spa
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/msword
dc.publisher.none.fl_str_mv Springer New York LLC
publisher.none.fl_str_mv Springer New York LLC
dc.source.none.fl_str_mv reponame:Biblos-e Archivo. Repositorio Institucional de la UAM
instname:Universidad Autónoma de Madrid
instname_str Universidad Autónoma de Madrid
reponame_str Biblos-e Archivo. Repositorio Institucional de la UAM
collection Biblos-e Archivo. Repositorio Institucional de la UAM
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869408021125267456
score 15.300719

Similares en LA Referencia