Dynamics of Anti-Proton -- Protons and Anti-Proton -- Nucleus Reactions

A short review of simulation results of anti-proton-proton and anti-proton-nucleus interactions within the framework of Geant4 FTF (Fritiof) model is presented. The model uses the main assumptions of the Quark-Gluon-String Model or Dual Parton Model. The model assumes production and fragmentation of quark-anti-quark and diquark-anti-diquark strings in the mentioned interactions. Key ingredients of the model are cross sections of string creation processes and an usage of the LUND string fragmentation algorithm. They allow one to satisfactory describe a large set of experimental data, especially, a strange particle production, Lambda hyperons and K mesons.Comment: 7 pages, 8 figure

Simulation of neutron production in hadron-nucleus and nucleus-nucleus interactions in Geant4

Studying experimental data obtained at ITEP [1] on neutron production in interactions of protons with various nuclei in the energy range from 747 MeV up to 8.1 GeV, we have found that slow neutron spectra have scaling and asymptotic properties [2]. The spectra weakly depend on the collision energy at momenta of projectile protons larger than 5 - 6 GeV/c. These properties are taken into account in the Geant4 Fritiof (FTF) model. The improved FTF model describes as well as the Geant4 Bertini model the experimental data on neutron production by 1.2 GeV and 1.6 GeV protons on targets (Fe, Pb) [3] and by 3.0 GeV protons on various targets (Al, Fe, Pb) [4]. For neutron production in antiproton-nucleus interactions, it was demonstrated that the FTF results are in a satisfactory agreement with experimental data of the LEAR collaboration [5]. The FTF model gives promising results for neutron production in nucleus - nucleus interactions at projectile energy 1 - 2 GeV per nucleon [6]. The observed properties allow one to predict neutron yields in the nucleus-nucleus interactions at high and very high energies. Predictions for the NICA/MPD experiment at JINR are presented.Comment: 6 pages, 5 figures. Contribution to Proceedings of Baldin ISHEPP XXI

Production of strange particles in hadronic interactions

The NA61/SHINE collaboration has recently published high precision data on production of $\pi^\pm$ and $K^\pm$ mesons, protons, antiprotons and $\Lambda$ hyperons in ${\rm pp}$ interactions at 20, 31, 40, 80 and 158 GeV/c, and in ${\rm pC}$ interactions at 31 GeV/c. The collaboration also presented experimental data on production of particles - $\pi^\pm$, $K^\pm$, $p^\pm$, $\rho^0$, $\omega$ and $K^{*0}$ in $\pi^-{\rm C}$ collisions at 158 and 350 GeV/c. The collaboration has compared these data with various Monte Carlo model calculations: UrQMD, EPOS, GiBUU, and others. All of the models have various problems. The latest version of the FTF (Fritiof) model of Geant4 solves most of these problems. In the FTF model, we have improved the fragmentation of quark-gluon strings with small masses and introduced dependencies of probabilities of strange mesons and baryon-antibaryon pair's creation on string masses. Due to these changes, we describe the data of the NA61/SHINE collaboration on particle production in ${\rm pp, pC}$, and $\pi^-{\rm C}$ interactions. The improved Geant4 FTF model also well reproduces experimental data on inclusive cross sections of $\Lambda, \bar{\Lambda}$ and $K^{0}$ production in antiproton-proton interactions at various energies. The modified FTF model allows one to simulate realistic processes with two particle productions - $\bar{p}p \rightarrow \Lambda \bar{\Lambda}$, $\bar{p}p \rightarrow K^{+} K^{-}$, $\bar{p}p \rightarrow \Lambda \bar{\Sigma}$, and $\bar{p}p \rightarrow\Sigma \bar{\Sigma}$, which will be studied in the future by the PANDA experiment at FAIR (GSI, Germany).Comment: 10 pages, 8 figures, IWNT-37, Rila, 2018, Bulgari

On the automorphism group of foliations with geometric transverse structure

Motivated by questions of deformations/moduli in foliation theory, we investigate the structure of some groups of diffeomorphisms preserving a foliation. We give an example of a $C^\infty$ foliation whose diffeomorphism group is not a Lie group in any reasonable sense. On the positive side, we prove that the automorphism group of a transversely holomorphic foliation or a riemannian foliation is a strong ILH Lie goup in the sense of Omori

Physics Validation of LHC Simulations

A review of the strategy and the results for the physics validation of Geant4 and Fluka detector simulation engines for LHC applications is presented. The main focus is on hadronic physics, where most of the efforts are currently concentrated. In particular, comparisons between simulation and test-beam data for the most relevant calorimeter observables, for different experiments and detector technologies, are discussed

Descrição da microbiota fúngica conjuntival de equinos saudáveis do Distrito Federal – DF

Dissertação (mestrado)—Universidade de Brasília, Faculdade de Agronomia e Medicina Veterinária, 2018.Os organismos fúngicos de importância oftálmica são classificados em fungos filamentosos e leveduras. Esses fungos estão envolvidos na invasão e infecção da córnea de equinos, e são os mesmos presentes na superfície ocular saudável, que varia com a região geográfica e estação climática. O objetivo desse estudo é identificar e descrever a incidência de fungos na conjuntiva ocular de equinos saudáveis do Distrito Federal, e correlacionar com a estação do ano, gênero de animal e meios de cultura utilizados, bem como avaliar a relação entre o meio de cultura utilizado e o crescimento de isolados fúngicos. Foram utilizados cinquenta cavalos (100 olhos), machos e fêmeas, com idade entre sete e 31 anos, provenientes do Regimento de Polícia Montada do Distrito Federal, Brasil. Swabs do fórnix conjuntival foram coletados e transportados em meio Stuart e solução salina, para semeadura em Ágar Sabouraud e Ágar Mycosel. O efeito da estação climática, gênero e meio de cultura, na frequência de fungos isolados foi avaliada. Culturas positivas foram obtidas em 220 amostras de um total de 300. Os cultivos apresentaram 33,67% de crescimento de bactérias e 55,97% de crescimento fúngico. O Aspergillus spp. foi o gênero mais incidente, encontrado em 26,33% das amostras, mais presente no verão, seguido pelo Cladosporium spp. 9%, Rhodotorula spp. 7,33%, Candida spp. 2,33%, Malassezia spp. 5,66%, Penicillium spp. 2,33%, Scopulariopsis spp. 2%, Fusarium spp. 0,66% e Exophiola jeanselmei 0,33%. Os fungos filamentosos foram mais prevalentes que as leveduras. A maior frequência foi do gênero Aspergillus spp. no verão, seguido do Cladosporium e Rhodotorula, caracterizados como fungos ambientais e agentes de infecções oportunistas. Bactérias, Aspergillus spp e Cladosporium spp. tiveram maior crescimento no meio Sabouraud, devido a seletividade do meio Mycosel.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES).Fungal organisms of ophthalmic importance are classified as filamentous fungi and yeasts. These fungi are involved in the invasion and infection of the cornea of horses, and are the same present on the healthy ocular surface, which varies with geographic region and climatic season. The aim of this study is to identify and describe the incidence of fungi in the ocular conjunctiva of healthy horses of the Federal District, and to correlate with the season of the year, animal genus and culture media used, as well as to evaluate the relationship between the culture medium used and the growth of fungal isolates. Fifty horses (100 eyes), males and females, aged between seven and 31 years old, coming from the Mounted Police Regiment of the Federal District, Brazil. Swabs of conjunctival fornix were collected and transported in Stuart medium and saline solution for sowing in Sabouraud Agar and Mycosel Agar. The effect of climatic season, genus and culture medium, on the frequency of isolated fungi was evaluated. Positive cultures were obtained in 220 samples of a total of 300. The cultures had 33.67% of bacterial growth and 55.97% of fungal growth. Aspergillus spp. was the most incident genus, found in 26.33% of the samples, most present in the summer, followed by Cladosporium spp. 9%, Rhodotorula spp. 7.33%, Candida spp. 2.33%, Malassezia spp. 5.66%, Penicillium spp. 2.33%, Scopulariopsis spp. 2%, Fusarium spp. 0.66% and Exophiola jeanselmei 0.33%. Filamentous fungi were more prevalent than yeasts. The highest frequency was of the genus Aspergillus spp. in the summer, followed by Cladosporium and Rhodotorula, characterized as environmental fungi and agents of opportunistic infections. Bacteria, Aspergillus spp and Cladosporium spp. had greater growth in the Sabouraud medium, due to the selectivity of Mycosel medium

A new development cycle of the Statistical Toolkit

The Statistical Toolkit is an open source system specialized in the statistical comparison of distributions. It addresses requirements common to different experimental domains, such as simulation validation (e.g. comparison of experimental and simulated distributions), regression testing in the course of the software development process, and detector performance monitoring. Various sets of statistical tests have been added to the existing collection to deal with the one sample problem (i.e. the comparison of a data distribution to a function, including tests for normality, categorical analysis and the estimate of randomness). Improved algorithms and software design contribute to the robustness of the results. A simple user layer dealing with primitive data types facilitates the use of the toolkit both in standalone analyses and in large scale experiments.Comment: To be published in the Proc. of CHEP (Computing in High Energy Physics) 201

Geant4 FTF model description of the latest data by the NA61/SHINE collaboration on 40Ar+45Sc{\rm ^{40}Ar+{}^{45}Sc} interactions

It is shown that the Geant4 FTF model, which does not include the simulation of the hard parton-parton scattering and the formation of the quark-gluon plasma (QGP), describes well the NA61/SHINE data on $\pi^-$ meson distributions for the interactions at $\sqrt{s_{NN}}=$ 5.2, 6.1, 7.6 and 8.8 GeV. At higher energies, $\sqrt{s_{NN}}=$ 11.9 and 16.8 GeV, the model underestimates the data. This is considered as an indication of the formation of QGP at higher energies in central collisions of light and intermediate nuclei than in collisions of heavy nuclei ($\sqrt{s_{NN}}\sim 6$ GeV).Comment: 5 pages, 2 figure

Herwig++ 2.0 Release Note

A new release of the Monte Carlo program Herwig++ (version 2.0) is now available. This is the first version of the program which can be used for hadron-hadron physics and includes the full simulation of both initial- and final-state QCD radiation.Comment: Source code and additional information available at http://hepforge.cedar.ac.uk/herwig