Reducing the fine-tuning of gauge-mediated SUSY breaking

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dc.contributor.author Casas, J.A.
dc.contributor.author Moreno, J. M.
dc.contributor.author Robles, S.
dc.contributor.author Rolbiecki, K.
dc.contributor.other UAM. Departamento de Física Teórica es_ES
dc.date.accessioned 2017-04-06T11:03:43Z
dc.date.available 2017-04-06T11:03:43Z
dc.date.issued 2016-08-11
dc.identifier.citation European Physical Journal C 76.8 (2016): 450 en_US
dc.identifier.issn 1434-6052 (online) es_ES
dc.identifier.issn 1434-6044 (print) es_ES
dc.identifier.uri http://hdl.handle.net/10486/677922
dc.description.abstract 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 en_US
dc.description.sponsorship This 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 program en_US
dc.format.extent 16 pag. es_ES
dc.format.mimetype application/msword en
dc.language.iso spa en
dc.publisher Springer New York LLC en_US
dc.relation.ispartof European Physical Journal C en_US
dc.rights © 2016, The Author(s) en_US
dc.subject.other Gauge-mediated en_US
dc.subject.other GMSB en_US
dc.subject.other Fine-tuning en_US
dc.title Reducing the fine-tuning of gauge-mediated SUSY breaking en_US
dc.type article en
dc.subject.eciencia Física es_ES
dc.relation.publisherversion http://dx.doi.org/10.1140/epjc/s10052-016-4305-4 es_ES
dc.identifier.doi 10.1140/epjc/s10052-016-4305-4 es_ES
dc.identifier.publicationfirstpage 450 es_ES
dc.identifier.publicationissue 8 es_ES
dc.identifier.publicationlastpage 450 es_ES
dc.identifier.publicationvolume 76 es_ES
dc.relation.projectID Gobierno de España. CSD2009-00064 es_ES
dc.relation.projectID Gobierno de España. CSD2007-00042 es_ES
dc.relation.projectID Gobierno de España. FPA2013-44773-P es_ES
dc.relation.projectID Gobierno de España. SEV-2012-0249 es_ES
dc.type.version info:eu-repo/semantics/publishedVersion en
dc.rights.cc Reconocimiento es_ES
dc.rights.accessRights openAccess en


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