Supersymmetry without a Light Higgs Boson

Motivated by the absence, so far, of any direct signal of conventional low-energy supersymmetry, we explore the consequences of making the lightest Higgs boson in supersymmetry relatively heavy, up to about 300 GeV, in the most straightforward way, i.e. via the introduction of a chiral singlet S with a superpotential interaction with the Higgs doublets, \lambda S H_1 H_2. The coupling \lambda dominates over all the other couplings and, to maintain the successful perturbative analysis of the ElectroWeak Precision Tests, is only restricted to remain perturbative up to about 10 TeV. The general features of this "\lambda SUSY" framework, which deviates significantly from the MSSM or the standard NMSSM, are analyzed in different areas: ElectroWeak Precision Tests, Dark Matter, naturalness bounds on superparticle masses, and LHC signals. There is a rich Higgs/Higgsino sector in the (200-700)GeV mass region, which may include LSP Higgsino dark matter. All other superpartners, apart from the top squarks, may naturally be heavier than 1-2 TeV. This picture can be made consistent with gauge coupling unification.Comment: 27 page

Algorithm for Linear Response Functions at Finite Temperatures: Application to ESR spectrum of s=1/2 Antiferromagnet Cu benzoate

We introduce an efficient and numerically stable method for calculating linear response functions $\chi(\vec{q},\omega)$ of quantum systems at finite temperatures. The method is a combination of numerical solution of the time-dependent Schroedinger equation, random vector representation of trace, and Chebyshev polynomial expansion of Boltzmann operator. This method should be very useful for a wide range of strongly correlated quantum systems at finite temperatures. We present an application to the ESR spectrum of s=1/2 antiferromagnet Cu benzoate.Comment: 4 pages, 4 figure

Higgsless Theory of Electroweak Symmetry Breaking from Warped Space

We study a theory of electroweak symmetry breaking without a Higgs boson, recently suggested by Csaki et al. The theory is formulated in 5D warped space with the gauge bosons and matter fields propagating in the bulk. In the 4D dual picture, the theory appears as the standard model without a Higgs field, but with an extra gauge group G which becomes strong at the TeV scale. The strong dynamics of G breaks the electroweak symmetry, giving the masses for the W and Z bosons and the quarks and leptons. We study corrections in 5D which are logarithmically enhanced by the large mass ratio between the Planck and weak scales, and show that they do not destroy the structure of the electroweak gauge sector at the leading order. We introduce a new parameter, the ratio between the two bulk gauge couplings, into the theory and find that it allows us to control the scale of new physics. We also present a potentially realistic theory accommodating quarks and leptons and discuss its implications, including the violation of universality in the W and Z boson couplings to matter and the spectrum of the Kaluza-Klein excitations of the gauge bosons. The theory reproduces many successful features of the standard model, although some cancellations may still be needed to satisfy constraints from the precision electroweak data.Comment: 17 pages, Latex; important correction in discussions on effects from brane terms, reference adde

Medium Modifications of Charm and Charmonium in High-Energy Heavy-Ion Collisions

The production of charmonia in heavy-ion collisions is investigated within a kinetic theory framework simultaneously accounting for dissociation and regeneration processes in both quark-gluon plasma (QGP) and hadron-gas phases of the reaction. In-medium modifications of open-charm states (c-quarks, D-mesons) and the survival of J/psi mesons in the QGP are included as inferred from lattice QCD. Pertinent consequences on equilibrium charmonium abundances are evaluated and found to be especially relevant to explain the measured centrality dependence of the psi'/psi ratio at SPS. Predictions for recent In-In experiments, as well as comparisons to current Au-Au data from RHIC, are provided.Comment: 4 Latex pages including 4 eps figures and IOP style files. Talk given at the 17th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions, Quark Matter 2004, Oakland, CA USA, 11-17 Jan 2004. To appear in J. Phys.

Gauge Coupling Unification from Unified Theories in Higher Dimensions

Higher dimensional grand unified theories, with gauge symmetry breaking by orbifold compactification, possess SU(5) breaking at fixed points, and do not automatically lead to tree-level gauge coupling unification. A new framework is introduced that guarantees precise unification -- even the leading loop threshold corrections are predicted, although they are model dependent. Precise agreement with the experimental result, \alpha_s^{exp} = 0.117 \pm 0.002, occurs only for a unique theory, and gives \alpha_s^{KK} = 0.118 \pm 0.004 \pm 0.003. Remarkably, this unique theory is also the simplest, with SU(5) gauge interactions and two Higgs hypermultiplets propagating in a single extra dimension. This result is more successful and precise than that obtained from conventional supersymmetric grand unification, \alpha_s^{SGUT} = 0.130 \pm 0.004 \pm \Delta_{SGUT}. There is a simultaneous solution to the three outstanding problems of 4D supersymmetric grand unified theories: a large mass splitting between Higgs doublets and their color triplet partners is forced, proton decay via dimension five operators is automatically forbidden, and the absence of fermion mass relations amongst light quarks and leptons is guaranteed, while preserving the successful m_b/m_\tau relation. The theory necessarily has a strongly coupled top quark located on a fixed point and part of the lightest generation propagating in the bulk. The string and compactification scales are determined to be around 10^{17} GeV and 10^{15} GeV, respectively.Comment: 29 pages, LaTe

Avaliação agrônomica de genótipos de bananeiras em Pariquera-Açú, SP - Vale do Ribeira: primeiro ciclo.

A bananeira é uma das fruteiras mais cultivadas nos países tropicais e seu fruto um dos mais consumidos no mundo. Existe grande número de cultivares de bananeira no Brasil, porém quando se consideram aspectos como preferência dos consumidores, produtividade, tolerância às doenças, porte adequado e resistência à seca e ao frio restam poucas com potencial agronômico para serem usadas comercialmente. As principais cultivares difundidas no Brasil apresentam pelo menos uma característica indesejável, que pode estar relacionada à produtividade, porte, qualidade dos frutos, resistência a pragas e doenças e principalmente com a aceitação pelo mercado consumidor. Desta forma, o objetivo deste trabalho foi avaliar o desenvolvimento vegetativo de genótipos de bananeiras para as condições edafoclimáticas da região do Vale do Ribeira, SP, visando a sua incorporação ao sistema de produção da região.pdf 97

Desenvolvimento das bananeiras Caipira e BRS Princesa cultivadas com doses de nitrogênio e potássio no Vale do Ribeira, SP.

A banana 'Maçã' é apreciada pelos consumidores devido seu paladar característico, porém é altamente suscetível ao Mal-do-Panamá. Programas de melhoramento genético desenvolveram cultivares de bananeira resistente a esta doença, como 'Caipira' e 'BRS Princesa', que necessitam de estudos nutricionais. Objetivou-se avaliar essas cultivares sob quatro níveis de adubação com N e K (NK0: sem adubação; NK1: 175 e 285kg ha-1 ano-1; NK2: 350 e 570kg ha-1 ano-1; NK3: 525 e 855kg ha-1ano-1) nas condições edafoclimáticas do Vale do Ribeira. O experimento foi instalado sob delineamento de blocos casualizados em esquema fatorial 2x4 (cultivares x níveis de adubação) e parcelas subdivididas no tempo (dois ciclos). O solo apresentava teores baixos de K (0,6 mmolc dm-3) e médio de M.O. (26,7g dm-3). Os níveis de adubação afetaram positivamente ambas cultivares no diâmetro do pseudocaule e o número de folhas no florescimento. Na ?BRS Princesa? os níveis de adubação influenciaram a altura do pseudocaule, número de folhas na colheita e altura da planta filha. Para atingir valores máximos dos parâmetros de desenvolvimento a 'BRS Princesa' necessita em média da aplicação de 499kg de N e 813kg de K2O ha-1ano-1, enquanto que a ?Caipira? necessita de 525kg de N e 855kg de K2O ha-1ano-1