2,705 research outputs found
Is the New Resonance Spin 0 or 2? Taking a Step Forward in the Higgs Boson Discovery
The observation of a new boson of mass \sim 125\gev at the CERN LHC may
finally have revealed the existence of a Higgs boson. Now we have the
opportunity to scrutinize its properties, determining its quantum numbers and
couplings to the standard model particles, in order to confirm or not its
discovery. We show that by the end of the 8 TeV run, combining the entire data
sets of ATLAS and CMS, it will be possible to discriminate between the
following discovery alternatives: a scalar or a tensor
particle with minimal couplings to photons, at a statistical
confidence level at least, using only diphotons events. Our results are based
on the calculation of a center-edge asymmetry measure of the reconstructed {\it
sPlot} scattering polar angle of the diphotons. The results based on
asymmetries are shown to be rather robust against systematic uncertainties with
comparable discrimination power to a log likelihood ratio statistic.Comment: 11 pages, 6 figures, 1 table. References added, minor typos correcte
R-parity as a residual gauge symmetry : probing a theory of cosmological dark matter
We present a non-supersymmetric scenario in which the R-parity symmetry arises as a result of spontaneous gauge symmetry breaking,
leading to a viable Dirac fermion WIMP dark matter candidate. Direct detection
in nuclear recoil experiments probes dark matter masses around TeV for
TeV consistent with searches at the LHC, while lepton
flavor violation rates and flavor changing neutral currents in neutral meson
systems lie within reach of upcoming experiments.Comment: 7 pages, 3 figure
Análise ergonómica de sistemas de produção orientados ao produto : estudo de um caso industrial
Neste artigo apresenta-se o trabalho realizado durante seis meses numa empresa de
esquentadores Bosch Buderus Termotecnologia Portugal. O objectivo deste trabalho foi o
estudo das condições ergonómicas da totalidade dos postos de trabalho do sistema de
produção. Por haver necessidade de manipular cargas de peso elevado nos supermercados de
materiais, estes foram alvo de análise tendo-se procurado estabelecer uma norma de utilização
que obedecesse aos princÃpios básicos da ergonomia.
Relata-se a análise ergonómica efectuada, que inclui a utilização de uma checklist que
contemplou todos os postos de trabalho. Através da elaboração de um questionário foi
possÃvel avaliar as linhas de montagem final, avaliando a ergonomia em diferentes
configurações, nomeadamente numa linha de montagem de layout linear e numa célula de
layout U
Reconfiguração de sistemas de produção orientados ao produto : estudo de um caso industrial
Neste artigo apresenta-se o trabalho realizado numa empresa de esquentadores Bosch Buderus
Termotecnologia Portugal. O objectivo deste trabalho foi a reconfiguração da linha existente
de montagem final de esquentadores para duas células de montagem.
A dificuldade em adaptar de maneira eficiente e eficaz a produção da linha às variações de
modelos a produzir impunha a sua reorganização. Desta forma, a empresa decidiu
experimentar novas configurações de sistemas de produção e, neste caso, de células de
montagem.
Da implementação do estudo realizado resultaram melhorias importantes no desempenho do
sistema de produção, em particular, simplificações dos fluxos de materiais com economias
substanciais de tempo e distâncias percorridas e ainda redução importante do número de
operadores necessários para satisfazer a procura
Ball detection for boccia game analysis
The present article proposes the training, testing and comparison of two models for ball detection, taking into account its final implementation in a Boccia game analysis computer-vision algorithm, within the 'iBoccia' framework. The goal is to have a versatile and flexible algorithm towards different game environments. The selected ball detectors were a Histogram-of-Oriented-Gradients feature based Support Vector Machine (HOG-SVM) and a Convolutional Neural Network (CNN) based on a less complex implementation of the You Only Look Once model (Tiny-YOLO). Both detectors were evaluated offline and in real-time. The subsequent results showed that their performance was similar in both evaluations, however, Tiny-YOLO outperformed HOG-SVM by a small margin in all the used metrics. In real-time, both detectors achieved an accuracy of approximately 90%. Despite the high accuracy values, the detector requires further improvement because a single non-detection can influence the computer-vision algorithm's output, making the system unreliable.FCT - Fundação para a Ciência e a Tecnologia(SFRH/BD/ SFRH/BD/133314/2017)This article is supported by the project Deus ex Machina: NORTE –
01 – 0145 – FEDER - 000026, supported by Norte Portugal Regional
Operational Programme (NORTE 2020), under the PORTUGAL 2020
Partnership Agreement, through the European Regional Development Fund
(ERDF). Vinicius Silva also thanks FCT for the PhD scholarship
SFRH/BD/ SFRH/BD/133314/2017
Deciphering the spin of new resonances in Higgsless models
We study the potential of the CERN Large Hadron Collider (LHC) to probe the
spin of new massive vector boson resonances predicted by Higgsless models. We
consider its production via weak boson fusion which relies only on the coupling
between the new resonances and the weak gauge bosons. We show that the LHC will
be able to unravel the spin of the particles associated with the partial
restoration of unitarity in vector boson scattering for integrated luminosities
of 150-560 fb^-1, depending on the new state mass and on the method used in the
analyses.Comment: 7 pages, 4 figures. Version published in Physical Review
Resonant Lepton-Gluon Collisions at the Large Hadron Collider
We study the lepton-induced resonant production of color-adjoint leptons
(leptogluons) at the LHC employing the lepton parton density function of the
proton. We demonstrate that this production mechanism can be useful to extend
the LHC ability to search for leptogluons beyond purely quark/gluon initiated
production processes up to ~ 3.5 TeV leptogluon masses and O(1) TeV
compositeness scales. Discerning leptogluons from scalar and vector leptoquarks
is also possible in this channel, given a data sample containing the order of
100 signal events. We argue that the resonant channel can be combined with
leptogluon pair and associated leptogluon-lepton productions to boost exclusion
limits and discovery prospects at the LHC.Comment: 15 pages, 8 figure
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