Childrens’ personality traits scale and peer acceptance

 O presente estudo objetivou verificar se a aceitação entre pares está relacionada a traços de personalidade. Foram estudados 411 alunos do ensino fundamental de uma escola pública, por meio da Escala de Traços de Personalidade para Crianças e o Teste Sociométrico. Dos resultados das análises de correlação e discriminação de grupos extremos ressaltaram, principalmente, três informações. Uma delas foi que as meninas tiveram uma pontuação média mais baixa em neuroticismo, mas sua presença produziu aceitação na escolha entre pares, enquanto que nos meninos, com média mais alta, não produziu esse efeito. A outra, que as meninas tiveram uma pontuação mais alta em psicoticismo e sociabilidade, não produzindo rejeição para as meninas, mas sim para os meninos. E, finalmente, as correlações foram baixas, apesar de significativas, tal como era esperado, pois a aceitação-rejeição deve ser apenas um dos componentes da personalidade. Nesse contexto, os dados desta pesquisa podem ser considerados evidência de validade para o Escala de Traços de Personalidade para Crianças. Palavras-chave: traços de personalidade; evidência de validade; teste sociométrico. The aim of this study was to identify whether personality traits and social acceptance are related. By means of the Escala de Traços de Personalidade para Crianças and Sociometric Test, 411 elementary public school students were studied. Among the results of correlation analysis and extreme group discrimination, three points of information were highlighted. The first point being that the neuroticism scores of girls were found to be lower than of boys, but its presence yielded to peer acceptance, whereas this reaction was not observed among the boys. The second point was that girls had higher scores for psychoticism and sociability than the boys, and this was related to the boys’ but not the girls’ peer rejection. The last point was that the correlations were low as expected, in spite of their significance; on this account, the peer acceptance-rejection factor must be take as just one of the personality components. In this context the data can be considered as valid evidence to Escala de Traços de Personalidade para Crianças. Keywords: personality traits; validity evidence; sociometric test

Search for leptophobic Z ' bosons decaying into four-lepton final states in proton-proton collisions at root s=8 TeV

Peer reviewe

Search for black holes and other new phenomena in high-multiplicity final states in proton-proton collisions at root s=13 TeV

Peer reviewe

Search for heavy resonances decaying into a vector boson and a Higgs boson in final states with charged leptons, neutrinos, and b quarks

Peer reviewe

Search for high-mass diphoton resonances in proton-proton collisions at 13 TeV and combination with 8 TeV search

Peer reviewe

Measurement of the azimuthal anisotropy of Y(1S) and Y(2S) mesons in PbPb collisions at √S^{S}NN = 5.02 TeV

The second-order Fourier coefficients (υ$_{2}$) characterizing the azimuthal distributions of Υ(1S) and Υ(2S) mesons produced in PbPb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV are studied. The Υmesons are reconstructed in their dimuon decay channel, as measured by the CMS detector. The collected data set corresponds to an integrated luminosity of 1.7 nb$^{-1}$. The scalar product method is used to extract the υ$_{2}$ coefficients of the azimuthal distributions. Results are reported for the rapidity range |y| < 2.4, in the transverse momentum interval 0 < p$_{T}$ < 50 GeV/c, and in three centrality ranges of 10–30%, 30–50% and 50–90%. In contrast to the J/ψ mesons, the measured υ$_{2}$ values for the Υ mesons are found to be consistent with zero

Performance of the CMS Level-1 trigger in proton-proton collisions at √s = 13 TeV

At the start of Run 2 in 2015, the LHC delivered proton-proton collisions at a center-of-mass energy of 13\TeV. During Run 2 (years 2015–2018) the LHC eventually reached a luminosity of 2.1× 10$^{34}$ cm$^{-2}$s$^{-1}$, almost three times that reached during Run 1 (2009–2013) and a factor of two larger than the LHC design value, leading to events with up to a mean of about 50 simultaneous inelastic proton-proton collisions per bunch crossing (pileup). The CMS Level-1 trigger was upgraded prior to 2016 to improve the selection of physics events in the challenging conditions posed by the second run of the LHC. This paper describes the performance of the CMS Level-1 trigger upgrade during the data taking period of 2016–2018. The upgraded trigger implements pattern recognition and boosted decision tree regression techniques for muon reconstruction, includes pileup subtraction for jets and energy sums, and incorporates pileup-dependent isolation requirements for electrons and tau leptons. In addition, the new trigger calculates high-level quantities such as the invariant mass of pairs of reconstructed particles. The upgrade reduces the trigger rate from background processes and improves the trigger efficiency for a wide variety of physics signals

Search for single production of a heavy vector-like T quark decaying to a Higgs boson and a top quark with a lepton and jets in the final state

A search for single production of vector-like top quark partners (T) decaying into a Higgs boson and a top quark is performed using data from pp collisions at a centre-of-mass energy of 13 TeV collected by the CMS experiment at the CERN LHC, corresponding to an integrated luminosity of 2.3 fb−1. The top quark decay includes an electron or a muon while the Higgs boson decays into a pair of b quarks. No significant excess over standard model backgrounds is observed. Exclusion limits on the product of the production cross section and the branching fraction are derived in the T quark mass range 700 to 1800 GeV. For a mass of 1000 GeV, values of the product of the production cross section and the branching fraction greater than 0.8 and 0.7 pb are excluded at 95% confidence level, assuming left- and right-handed coupling of the T quark to standard model particles, respectively. This is the first analysis setting exclusion limits on the cross section of singly produced vector-like T quarks at a centre-of-mass energy of 13 TeV