Supersymmetric type-III seesaw: lepton flavour violating decays and dark matter

We study a supersymmetric version of the seesaw mechanism type-III. The model consists of the MSSM particle content plus three copies of 24 superfields. The fermionic part of the SU(2) triplet contained in the 24 is responsible for the type-III seesaw, which is used to explain the observed neutrino masses and mixings. Complete copies of 24 are introduced to maintain gauge coupling unification. These additional states change the beta functions of the gauge couplings above the seesaw scale. Using mSUGRA boundary conditions we calculate the resulting supersymmetric mass spectra at the electro-weak scale using full 2-loop renormalization group equations. We show that the resulting spectrum can be quite different compared to the usual mSUGRA spectrum. We discuss how this might be used to obtain information on the seesaw scale from mass measurements. Constraints on the model space due to limits on lepton flavour violating decays are discussed. The main constraints come from the bounds on the decay mu to e and gamma but there are also regions where the decay tau to mu and gamma gives stronger constraints. We also calculate the regions allowed by the dark matter constraint. For the sake of completeness, we compare our results with those for the supersymmetric seesaw type-II and, to some extent, with type-I.Comment: 32 pages, 16 eps figures. One ref. added; small changes in tex

Estudi paleodontològic de les restes humanes del jaciment de Forat de Conqueta (Santa Linya, Lleida)

L"estudi ha estat realitzat sobre restes dentals recuperades al jaciment de Forat de Conqueta. La majoria de les dents s"han trobat aïllades, fora del suport ossi, la qual cosa n"ha dificultat la identificació i l"estudi. Entre els objectius de l"estudi paleodontològic, volem destacar la determinació d"un nombre mínim i màxim d"individus a partir de les restes. L"estudi ha estat molt limitat a causa de la tipologia funerària (enterrament col·lectiu en cova) i del ritual d"enterrament (cremació parcial). El resultats provisionals assenyalen que el nombre mínim d"individus representats per la mostra estudiada és de 41 i que, d"aquests, fins a sis individus podrien pertànyer a un grup d"edat infantil o juveni

Estudio paleodontológico de los restos humanos del yacimiento de Forat de Conqueta (Santa Linya, Lleida)

L’estudi ha estat realitzat sobre restes dentals recuperades al jaciment de Forat de Conqueta. La majoria de les dents s’han trobat aïllades, fora del suport ossi, la qual cosa n’ha dificultat la identificació i l’estudi. Entre els objectius de l’estudi paleodontològic, volem destacar la determinació d’un nombre mínim i màxim d’individus a partir de les restes. L’estudi ha estat molt limitat a causa de la tipologia funerària (enterrament col·lectiu en cova) i del ritual d’enterrament (cremació parcial). El resultats provisionals assenyalen que el nombre mínim d’individus representats per la mostra estudiada és de 41 i que, d’aquests, fins a sis individus podrien pertànyer a un grup d’edat infantil o juvenil.The study was based on dental remains recovered at the site of the Forat de la Conqueta. Most of the teeth have been isolated outside the bony support, which has hampered their identification and study. One of the objectives of this paleodontologic study is to highlight the determination of a minimum and maximum number of individuals from the rest. The study was limited because of the nature of the burial (collective burial cave) and ritual burial (partial cremation). The interim results indicate that the minimum number of individuals represented by the study sample is 41 and that of these, up to 6 individuals might belong to a group of childhood or youth.El estudio se ha realizado sobre los restos dentales recuperados en el yacimiento de Forat de Conqueta. La mayor parte de los dientes se han encontrado aislados, fuera del soporte óseo, hecho que dificulta su identificación y estudio. Entre los objetivos del estudio paleodontológico, destaca la determinación del número mínimo y máximo de individuos a partir de los restos. El estudio ha sido muy limitado debido a la tipología funeraria (enterramiento colectivo en cueva) y el ritual de enterramiento (cremación parcial). Los resultados provisionales indican que el número mínimo de individuos representados por la muestra estudiada es de 41, de los cuales seis individuos podrían pertenecer al grupo de edad infantil o juvenil

Estudi paleodontològic de les restes humanes del jaciment de Forat de Conqueta (Santa Linya, Lleida)

L'estudi ha estat realitzat sobre restes dentals recuperades al jaciment de Forat de Conqueta. La majoria de les dents s'han trobat aïllades, fora del suport ossi, la qual cosa n'ha dificultat la identificació i l'estudi. Entre els objectius de l'estudi paleodontològic, volem destacar la determinació d'un nombre mínim i màxim d'individus a partir de les restes. L'estudi ha estat molt limitat a causa de la tipologia funerària (enterrament col·lectiu en cova) i del ritual d'enterrament (cremació parcial). El resultats provisionals assenyalen que el nombre mínim d'individus representats per la mostra estudiada és de 41 i que, d'aquests, fins a sis individus podrien pertànyer a un grup d'edat infantil o juvenil.The study was based on dental remains recovered at the site of the Forat de la Conqueta. Most of the teeth have been isolated outside the bony support, which has hampered their identification and study. One of the objectives of this paleodontologic study is to highlight the determination of a minimum and maximum number of individuals from the rest. The study was limited because of the nature of the burial (collective burial cave) and ritual burial (partial cremation). The interim results indicate that the minimum number of individuals represented by the study sample is 41 and that of these, up to 6 individuals might belong to a group of childhood or youth.El estudio se ha realizado sobre los restos dentales recuperados en el yacimiento de Forat de Conqueta. La mayor parte de los dientes se han encontrado aislados, fuera del soporte óseo, hecho que dificulta su identificación y estudio. Entre los objetivos del estudio paleodontológico, destaca la determinación del número mínimo y máximo de individuos a partir de los restos. El estudio ha sido muy limitado debido a la tipología funeraria (enterramiento colectivo en cueva) y el ritual de enterramiento (cremación parcial). Los resultados provisionales indican que el número mínimo de individuos representados por la muestra estudiada es de 41, de los cuales seis individuos podrían pertenecer al grupo de edad infantil o juvenil

Dark matter and LHC phenomenology in a left-right supersymmetric model

Left-right symmetric extensions of the Minimal Supersymmetric Standard Model can explain neutrino data and have potentially interesting phenomenology beyond that found in minimal SUSY seesaw models. Here we study a SUSY model in which the left-right symmetry is broken by triplets at a high scale, but significantly below the GUT scale. Sparticle spectra in this model differ from the usual constrained MSSM expectations and these changes affect the relic abundance of the lightest neutralino. We discuss changes for the standard stau (and stop) co-annihilation, the Higgs funnel and the focus point regions. The model has potentially large lepton flavour violation in both, left and right, scalar leptons and thus allows, in principle, also for flavoured co-annihilation. We also discuss lepton flavour signals due to violating decays of the second lightest neutralino at the LHC, which can be as large as 20 fb(-1) at root s = 14 TeV

Dark matter in minimal supergravity with type-II seesaw

We calculate the relic density of the lightest neutralino in a supersymmetric seesaw type-II (``triplet seesaw'') model with minimal supergravity boundary conditions at the GUT scale. The presence of a triplet below the GUT scale, required to explain measured neutrino data in this setup, leads to a characteristic deformation of the sparticle spectrum with respect to the pure mSugra expectations, affecting the calculated relic dark matter (DM) density. We discuss how the DM allowed regions in the (m_0,M_{1/2}) plane change as a function of the (type-II) seesaw scale. We also compare the constraints imposed on the models parameter space form upper limits on lepton flavour violating (LFV) decays to those imposed by DM. Finally, we briefly comment on uncertainties in the calculation of the relic neutralino density due to uncertainties in the measured top and bottom masses.Comment: 20 pages, 21 Figures in Encapsulated Postscrip

Flavour violation at the LHC: type-I versus type-II seesaw in minimal supergravity

We reconsider the role that the possible detection of lepton flavour violating (LFV) decays of supersymmetric particles at the Large Hadron Collider (LHC) can play in helping reconstruct the underlying neutrino mass generation mechanism within the simplest high-scale minimal supergravity (mSUGRA) seesaw schemes. We study in detail the LFV scalar tau decays at the LHC, assuming that the observed neutrino masses arise either through the pure type-I or the simpler type-II seesaw mechanism. We perform a scan over the mSUGRA parameter space in order to identify regions where lepton flavour violating decays of $\chi^0_2$ can be maximized, while respecting current low-energy constraints, such as those coming from the bounds on Br($\mu \to e \gamma$). We estimate the cross section for $\chi^0_2 \to \chi^0_1 + \tau + \mu$. Though insufficient for a full reconstruction of the seesaw, the search for LFV decays of supersymmetric states at the LHC brings complementary information to that coming from low energy neutrino oscillation experiments and LFV searches.Comment: 20 pages, 13 figures; minor changes; 4 references added, final version for publicatio

CEE de la cavidad bucal ¿Para cuando un diagnóstico precoz?

La visualización es la estrategia principal para acceder y tomar conocimiento de las lesiones con riesgo de transformación maligna presentadas por los pacientes. De este modo, cualquier procedimiento que puede amplificar o mejor evidenciar la observación de estas lesiones, ayudará el clínico y consecuentemente el paciente

LHC and lepton flavour violation phenomenology of a left-right extension of the MSSM

We study the phenomenology of a supersymmetric left-right model, assuming minimal supergravity boundary conditions. Both left-right and (B-L) symmetries are broken at an energy scale close to, but significantly below the GUT scale. Neutrino data is explained via a seesaw mechanism. We calculate the RGEs for superpotential and soft parameters complete at 2-loop order. At low energies lepton flavour violation (LFV) and small, but potentially measurable mass splittings in the charged scalar lepton sector appear, due to the RGE running. Different from the supersymmetric 'pure seesaw' models, both, LFV and slepton mass splittings, occur not only in the left- but also in the right slepton sector. Especially, ratios of LFV slepton decays, such as Br(${\tilde\tau}_R \to \mu \chi^0_1$)/Br(${\tilde\tau}_L \to \mu \chi^0_1$) are sensitive to the ratio of (B-L) and left-right symmetry breaking scales. Also the model predicts a polarization asymmetry of the outgoing positrons in the decay $\mu^+ \to e^+ \gamma$, A ~ [0,1], which differs from the pure seesaw 'prediction' A=1$. Observation of any of these signals allows to distinguish this model from any of the three standard, pure (mSugra) seesaw setups.Comment: 43 pages, 17 figure

A tool box for implementing supersymmetric models

We present a framework for performing a comprehensive analysis of a large class of supersymmetric models, including spectrum calculation, dark matter studies and collider phenomenology. To this end, the respective model is defined in an easy and straightforward way using the \Mathematica package SARAH. SARAH then generates model files for CalcHep which can be used with MicrOmegas as well as model files for WHIZARD and OMEGA. In addition, Fortran source code for SPheno is created which facilitates the determination of the particle spectrum using two-loop renormalization group equations and one-loop corrections to the masses. As an additional feature, the generated SPheno code can write out input files suitable for use with HiggsBounds to apply bounds coming from the Higgs searches to the model. Combining all program provides a closed chain from model building to phenomenology.Comment: 68 pages, 7 figure