Susy Glaubach working in a laboratory; Vienna Portraits Women

Digital Image

Four generations: SUSY and SUSY breaking

We revisit four generations within the context of supersymmetry. Wecompute the perturbativity limits for the fourth generation Yukawa couplings and show that if the masses of the fourth generation lie within reasonable limits of their present experimental lower bounds, it is possible to have perturbativity only up to scales around 1000 TeV. Such low scales are ideally suited to incorporate gauge mediated supersymmetry breaking, where the mediation scale can be as low as 10-20 TeV. The minimal messenger model, however, is highly constrained. While lack of electroweak symmetry breaking rules out a large part of the parameter space, a small region exists, where the fourth generation stau is tachyonic. General gauge mediation with its broader set of boundary conditions is better suited to accommodate the fourth generation.

Distinguishing SUSY scenarios using tau polarisation and neutralino Dark Matter

We discuss rst a method of measuring polarisation at the ILC using the 1{prong hadronic decays of the . We then show in this contribution how a study of the ~sector and particularly use of decay polarisation can oer a very good handle for distinguishing between mSUGRA and a SUSY-GUTs scenario, both of which can give rise to appropriate Dark Matter.

Postcards from oases in the desert: phenomenology of SUSY with intermediate scales

The presence of new matter fields charged under the Standard Model gauge group at intermediate scales below the Grand Unification scale modifies the renormalization group evolution of the gauge couplings. This can in turn significantly change the running of the Minimal Supersymmetric Standard Model parameters, in particular the gaugino and the scalar masses. In the absence of new large Yukawa couplings we can parameterise all the intermediate scale models in terms of only two parameters controlling the size of the unified gauge coupling. As a consequence of the modified running, the low energy spectrum can be strongly affected with interesting phenomenological consequences. In particular, we show that scalar over gaugino mass ratios tend to increase and the regions of the parameter space with neutralino Dark Matter compatible with cosmological observations get drastically modified. Moreover, we discuss some observables that can be used to test the intermediate scale physics at the LHC in a wide class of models.

Signature of charged to neutral Higgs boson decay at the LHC in SUSY models

We study the signature of H+/- decay into h(0)W at the LHC in SUSY models. It has only marginal viability in the MSSM. But in the singlet extensions like the NMSSM one can have a spectacular signature for H+/- decay into (h(0), A(0))W over a significant domain of parameter space. (C) 1999 Published by Elsevier B.V. B.V. All rights reserved.

Extending SUSY reach at the CERN large hadron collider using b-tagging

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Effects of SO(10) D terms on SUSY signals at the Fermilab Tevatron

We study signals for the production of superparticles at the Fermilab Tevatron in supergravity scenarios based on the grand unified group SO(10). The breaking of this group introduces extra contributions to the masses of all scalars, described by a single new parameter. We find that varying this parameter can considerably change the size of various expected signals studied in the literature, with different numbers of jets and/or charged leptons in the final state. The ratios of these signals can thus serve as a diagnostic to detect or constrain deviations from the much-studied scenario where all scalar masses are universal at the GUT scale. Moreover, under favorable circumstances some of these signals, and/or new signals involving hard b jets, should be observable at the next run of the Fermilab Tevatron collider even if the average scalar mass lies well above the gluino mass. ©2000 The American Physical Society.

N=1 SUSY backgrounds with an AdS factor from non-Abelian T duality

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

A new simple class of superpotentials in SUSY quantum mechanics

In this work, we introduce the class of quantum mechanics superpotentials W(x) = g epsilon(x)x(2n) and study in detail the cases n = 0 and 1. The n = 0 superpotential is shown to lead to the known problem of two supersymmetrically related Dirac delta potentials (well and barrier). The n = 1 case results in the potentials V+/-(x) = g(2)x(4) +/- 2g|x|. For V-, we present the exact ground-state solution and study the excited states by a variational technique. Starting from the ground state of V- and using logarithmic perturbation theory, we study the ground states of V+ and also of V(x) = g(2)x(4) and compare the result obtained in this new way with other results for this last potential in the literature.

Gauging MSSM global symmetries and SUSY breaking in de Sitter vacuum

We elaborate on a recent study of a model of supersymmetry breaking we proposed recently, in the presence of a tunable positive cosmological constant, based on a gauged shift symmetry of a string modulus, external to the Standard Model (SM) sector. Here, we identify this symmetry with a global symmetry of the SM and work out the corresponding phenomenology. A particularly attracting possibility is to use a combination of Baryon and Lepton number that contains the known matter parity and guarantees absence of dimension-four and -five operators that violate B and L.

Susy Shock trans piradx : El inclasificable género colibrí

Mensualmente, en Buenos Aires, la artista trans Susy Shock presenta su arte performativo en Poemarios Trans Pirados y Noches Bizarras. Su reivindicación a lo monstruoso se inscribe en lo queer pues propone la imposibilidad de rotular, clasificar, o clausurar las derivas de deseo, género y sexo. Vislumbramos lo ?mascufemenino? en disputa: una deconstrucción de categorías naturalizadas que invita a repensarnos en cada escrito, canción y presentación. Su construcción de género deviene en "colibrí", recordando el Parakultural y al "clown-travesti-literario" Batato Barea. Así, advertimos la destrucción de binarismos en un cuerpo deseante y una militancia trans que transgrede la "matriz heterosexual"

Susy Shock trans piradx : El inclasificable género colibrí

Mensualmente, en Buenos Aires, la artista trans Susy Shock presenta su arte performativo en Poemarios Trans Pirados y Noches Bizarras. Su reivindicación a lo monstruoso se inscribe en lo queer pues propone la imposibilidad de rotular, clasificar, o clausurar las derivas de deseo, género y sexo. Vislumbramos lo ?mascufemenino? en disputa: una deconstrucción de categorías naturalizadas que invita a repensarnos en cada escrito, canción y presentación. Su construcción de género deviene en "colibrí", recordando el Parakultural y al "clown-travesti-literario" Batato Barea. Así, advertimos la destrucción de binarismos en un cuerpo deseante y una militancia trans que transgrede la "matriz heterosexual"

Susy Shock trans piradx : El inclasificable género colibrí

Mensualmente, en Buenos Aires, la artista trans Susy Shock presenta su arte performativo en Poemarios Trans Pirados y Noches Bizarras. Su reivindicación a lo monstruoso se inscribe en lo queer pues propone la imposibilidad de rotular, clasificar, o clausurar las derivas de deseo, género y sexo. Vislumbramos lo ?mascufemenino? en disputa: una deconstrucción de categorías naturalizadas que invita a repensarnos en cada escrito, canción y presentación. Su construcción de género deviene en "colibrí", recordando el Parakultural y al "clown-travesti-literario" Batato Barea. Así, advertimos la destrucción de binarismos en un cuerpo deseante y una militancia trans que transgrede la "matriz heterosexual"