Planar Two-Loop Five-Parton Amplitudes from Numerical Unitarity

We compute a complete set of independent leading-color two-loop five-parton amplitudes in QCD. These constitute a fundamental ingredient for the next-to-next-to-leading order QCD corrections to three-jet production at hadron colliders. We show how to consistently consider helicity amplitudes with external fermions in dimensional regularization, allowing the application of a numerical variant of the unitarity approach. Amplitudes are computed by exploiting a decomposition of the integrand into master and surface terms that is independent of the parton type. Master integral coefficients are numerically computed in either finite-field or floating-point arithmetic and combined with known analytic master integrals. We recompute two-loop leading-color four-parton amplitudes as a check of our implementation. Results are presented for all independent four- and five-parton processes including contributions with massless closed fermion loops.Comment: v3: corrected wrong signs for five-gluon $N_f^2$ amplitudes with vanishing tree

Detecting sudden variations in web apps code smells’ density: A longitudinal study

Code smells are considered potentially harmful to software maintenance. Their introduction is dependent on the production of new code or the addition of smelly code produced by another team. Code smells survive until being refactored or the code where they stand is removed. Under normal conditions, we expect code smells density to be relatively stable throughout time. Anomalous (sudden) increases in this density are expected to hurt maintenance costs and the other way round. In the case of sudden increases, especially in pre-release tests in an automation server pipeline, detecting those outlier situations can trigger refactoring actions before releasing the new version. This paper presents a longitudinal study on the sudden variations in the introduction and removal of 18 server code smells on 8 PHP web apps, across several years. The study regards web applications but can be generalized to other domains, using other CS and tools. We propose a standardized detection criterion for this kind of code smell anomalies. Besides providing a retrospective view of the code smell evolution phenomenon, our detection approach, which is particularly amenable to graphical monitoring, can make software project managers aware of the need for enforcing refactoring actions.info:eu-repo/semantics/publishedVersio

Avaliação de progênies precoces de feijoeiro oriundas de cinco ciclos de seleção recorrente.

O objetivo do trabalho foi a avaliação de progênies, oriundas de cinco ciclos de seleção recorrente para florescimento precoce, visando selecionar progênies que apresentem florescimento precoce, aliadas à demais características de interesse aos melhoristas

Estimativas de parâmetros de compensação e de estabilidade entre linhagens de feijoeiro visando a obtenção de multilinhas.

Foi realizado o presente trabalho visando à obtenção de estimativas da capacidade de compensação de linhagens de feijão, bem como verificar se misturas das linhagens possuem maior estabilidade que as suas linhagens componentes

Phenotypic recurrent selection in the common bean ( Phaseolus vulgaris L) with carioca-type grains for resistance to the fungi Phaeoisariopsis griseola.

The efficiency of recurrent selection was assessed in obtaining common bean (Phaseolus vulgaris L) plant lines resistant to the phytopathogenic fungi Phaeoisariopsis griseola. The base bean population was obtained from the partial diallel between seven lines with carioca-type grains and 10 sources of resistance to P. griseola. The plants most resistant to the pathogen were selected in the F2 (S0) generation of the populations (C-0). The best S0:1 plants that presented carioca-type grains were intercrossed to obtain cycle I (C-I). The same procedure was adopted to obtain cycles C-II to C-V. In each recurrent selection cycle, S0:1 progenies selected were also assessed in experiments carried out in Lavras, Brazil, always using as check the Carioca MG (susceptible to P. griseola) and Pérola (tolerant) cultivars. The response to selection for resistance to the pathogen was estimated from the general mean of the S0:1 progenies from each selective cycle compared to the susceptible check Carioca MG. The estimated gain was 6.4% per cycle and the indirect response in grain yield by selection for resistance to the pathogen was 8.9% per cycle. The variability detected among the progenies in the last selective cycles enabled the prediction of additional responses to recurrent selection

Emprego do sistema de nove covas para avaliação da arquitetura de feijoeiro.

Com o objetivo de avaliar o emprego do sistema de nove covas na eficiência da seleção entre plantas de feijoeiro visando obter porte mais ereto e alta produtividade, foram avaliadas 97 progênies na geração F2:3 e na geração F2:4, utilizando o delineamento de blocos casualizados com 20 repetições