Searches for Higgs bosons in pp collisions at s=7 and 8 TeV in the context of four-generation and fermiophobic models

Searches are reported for Higgs bosons in the context of either the standard model extended to include a fourth generation of fermions (SM4) with masses of up to 600 GeV or fermiophobic models. For the former, results from three decay modes (ττ, WW, and ZZ) are combined, whilst for the latter the diphoton decay is exploited. The analysed proton-proton collision data correspond to integrated luminosities of up to 5.1 fb-1 at 7 TeV and up to 5.3 fb-1 at 8 TeV. The observed results exclude the SM4 Higgs boson in the mass range 110-600 GeV at 99% confidence level (CL), and in the mass range 110-560 GeV at 99.9% CL. A fermiophobic Higgs boson is excluded in the mass range 110-147 GeV at 95% CL, and in the range 110-133 GeV at 99% CL. The recently observed boson with a mass near 125 GeV is not consistent with either an SM4 or a fermiophobic Higgs boson. © 2013 CERN.

Histologic and biomechanical evaluation of 2 resorbable-blasting media implant surfaces at early implantation times

This study evaluated 3 implant surfaces in a dog model: (1) resorbable-blasting media + acid-etched (RBMa), alumina-blasting + acid-etching (AB/AE), and AB/AE + RBMa (hybrid). All of the surfaces were minimally rough, and Ca and P were present for the RBMa and hybrid surfaces. Following 2 weeks in vivo, no significant differences were observed for torque, bone-to-implant contact, and bone-area fraction occupied measurements. Newly formed woven bone was observed in proximity with all surfaces.

Inclusive search for supersymmetry using razor variables in pp collisions at √s=7 TeV

An inclusive search is presented for new heavy particle pairs produced in √s=7 TeV proton-proton collisions at the LHC using 4.7±0.1 fb -1 of integrated luminosity. The selected events are analyzed in the 2D razor space of MR, an event-by-event indicator of the heavy particle mass scale, and R, a dimensionless variable related to the missing transverse energy. The third-generation sector is probed using the event heavy-flavor content. The search is sensitive to generic supersymmetry models with minimal assumptions about the superpartner decay chains. No excess is observed in the number of events beyond that predicted by the standard model. Exclusion limits are derived in the CMSSM framework as well as for simplified models. Within the CMSSM parameter space considered, gluino masses up to 800 GeV and squark masses up to 1.35 TeV are excluded at 95% confidence level depending on the model parameters. The direct production of pairs of top or bottom squarks is excluded for masses as high as 400 GeV. © 2013 CERN.

Interpretation of searches for supersymmetry with simplified models

The results of searches for supersymmetry by the CMS experiment are interpreted in the framework of simplified models. The results are based on data corresponding to an integrated luminosity of 4.73 to 4.98 fb-1. The data were collected at the LHC in proton-proton collisions at a center-of-mass energy of 7 TeV. This paper describes the method of interpretation and provides upper limits on the product of the production cross section and branching fraction as a function of new particle masses for a number of simplified models. These limits and the corresponding experimental acceptance calculations can be used to constrain other theoretical models and to compare different supersymmetry-inspired analyses. © 2013 CERN.

¿Cómo, la remuneración de los choferes de la locomoción colectiva en Santiago de Chile, afecta el desempeño del sistema de buses?(una comparación entre el salario fijo y "la guerra por el boleto")

Existen dos sistemas de remuneración a los choferes de buses en Santiago de Chile. En uno, la mayoría de los choferes es remunerada según el número de pasajeros que transporta, lo que se traduce en su interés en maximizar el número de pasajeros transportados. Algunos de estos efectos son positivos, como el de ordenar los intervalos entre buses, minimizando de este modo, el problema del desplazamiento conjunto de varios buses a la vez. Otros son negativos, como el estilo agresivo de conducción, que puede ser muy peligroso. Se dice que los choferes "corren" y la expresión "la guerra por el boleto" es frecuentemente usada. Los choferes también pagan a trabajadores informales, conocidos en Santiago como "sapos", quienes les proporcionan información sobre los intervalos entre buses. Situaciones comparables se encuentran en varias otras ciudades latinoamericanas.El otro sistema, de salario fijo, se usa en dos empresas, que operan en las concesiones recientemente otorgadas para las rutas de acercamiento hacia las estaciones del Metro. El trabajo, tema de la actual edición del Boletín, identifica mediante un análisis tanto cuantitativo como cualitativo, los efectos de los dos sistemas, sobre los accidentes, la calidad del servicio, las actitudes de los choferes y pasajeros, y el tiempo promedio de espera para los usuarios del transporte público.

How do driver compensation schemes affect bus system performance?: a comparison between fixed wage and "guerra por el boleto" in Santiago, Chile.

Two systems of bus driver compensation exist in Santiago, Chile. The majority of drivers are paid per passenger transported, which leads to drivers trying to maximize the number of passengers each one conveys. Some of these effects are beneficial, such as a more active effort to minimize the problem of bus bunching, while others, such as aggressive driving, can be harmful. Drivers are said to "race" and the term "War for the Fare" is commonly used. Drivers also pay freelance workers called "sapos" to provide spacing information. Similar phenomena occur in other Latin American capitals.The other system, a fixed wage, is used by 2 companies holding recently awarded concessions for routes feeding metro stations.This paper discusses, quantitatively and qualitatively, the effects of these two compensation systems on accidents, quality of service, attitudes of both users and drivers, and average waiting times for passengers.

Energy Efficiency in Central America: Progress and action towards the fulfillment of the goals of the Central American sustainable energy strategy

Includes bibliography.

A percepção de competência, autonomia e pertencimento como indicadores da qualidade motivacional do aluno

Pós-graduação em Educação - FFC

Percepções dos alunos sobre sua própria (des) motivação: estudo comparativo em turmas dos cursos extensivo e intensivo de licenciatura em letras língua inglesa

Tanto a motivação quanto seu oposto – a desmotivação – têm sido estudadas no âmbito da aprendizagem de línguas estrangeiras. No entanto, poucos trabalhos investigam esses construtos do ponto de vista de sua dinamicidade. Esta pesquisa tem por objetivo compreender a motivação e a desmotivação em alunos de uma turma extensiva e uma turma intensiva de graduação em Letras Língua Inglesa e as implicações destas na aprendizagem da língua alvo. Utilizando os pressupostos teóricos estabelecidos por Dörnyei e Ushioda (2011), Dörnyei (2011, 2001), Ushioda (2008), Gardner (2007), Deci e Ryan (2000) entre outros, analisa-se os dados coletados por meio de um questionário e dos históricos escolares dos alunos de ambas as turmas. A pesquisa em questão é um estudo de caso que faz uso do método comparativo. Participam dela 21 alunos de duas turmas de licenciatura em Letras Língua Inglesa da Universidade Federal do Pará, Campus Universitário de Bragança: 11 alunos da turma extensiva e 10 da turma intensiva. Percebeu-se que, embora existam padrões motivacionais que agrupam os alunos, a motivação é individual e mutante, já que o processo motivacional não acontece da mesma forma e exerce influências diversas em sujeitos diferentes e muda no decorrer do tempo em um mesmo indivíduo. Os dados também mostram a complexidade do construto, pois o fato de haver motivação não significa que influências negativas não possam ocorrer, bem como influências negativas podem ser impulsos para um posterior aumento do nível motivacional. Além disso, constatou-se que a motivação percebida pelos alunos não garante bons resultados nas disciplinas cursadas. Esta pesquisa poderá ajudar na compreensão do processo motivacional como um sistema dinâmico e a entender que tanto os alunos de turmas extensivas quanto os de turmas intensivas podem ser motivados, já que a motivação é uma condição individual.

Measurement of the ZZ production cross section and search for anomalous couplings in 2l2l' final states in pp collisions at root s=7 TeV

A measurement is presented of the ZZ production cross section in the ZZ -> 2l2l' decay mode with l = e, mu and l' = e, mu, tau in proton-proton collisions at root s = 7 TeV with the CMS experiment at the LHC. Results are based on data corresponding to an integrated luminosity of 5.0 fb(-1). The measured cross section sigma(pp -> ZZ) = 6.24(-080)(+0.86) (stat.)(-0.32)(+0.41) (syst.) +/- 0.14 (lumi.) pb is consistent with the standard model predictions. The following limits on ZZZ and ZZ-gamma anomalous trilinear gauge couplings are set at 95% confidence level: -0.011 < f(4)(Z) < 0.012, -0.012 < f(5)(Z) < 0.012, -0.013 < f(4)(gamma) < 0.015, and -0.014 < f(5)(gamma) < 0.014.

Measurement of the t(t)over-bar production cross section in pp collisions at root s=7 TeV with lepton plus jets final states

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Identification of b-quark jets with the CMS experiment

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Search for long-lived particles in events with photons and missing energy in proton-proton collisions at root s=7 TeV

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Search for heavy resonances in the W/Z-tagged dijet mass spectrum in pp collisions at 7 TeV

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Measurement of the Upsilon(1S), Upsilon(2S), and Upsilon(3S) cross sections in pp collisions at root s=7 TeV

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)