O experimento ALICE foi inicialmente projetado para estudar o chamado Plasma de Quarks e Glúons (QGP, na sigla em inglês), um estado da matéria altamente interagente, onde quarks e glúons não estão confinados nos hádrons. Acredita-se que o Universo primitivo tenha existido em tal estado cerca de $10^{-6}$ segundos após o Big Bang. O QGP é o fluido mais quente e denso já estudado em...
O Cluster ATLAS-Brasil, hoje formado pela UERJ, UFBA, UFJF, UFRJ, UFRN e USP, participa do Experimento ATLAS no LHC desde a sua concepção, tendo iniciado suas atividades ainda em 1988 no CERN. Neste trabalho de pesquisa colaborativa, o Cluster ATLAS-Brasil reúne pesquisadores da Física, Engenharias e Ciência da Computação, que cobrem diferentes aspectos de pesquisa na física experimental...
Serão apresentadas as atividades recentes do grupo brasileiro que participa do experimento CMS do CERN/LHC.
A colaboração LHCb opera um dos detetores no acelerador LHC do CERN e conta com a participação brasileira desde 1998. O grupo brasileiro, formado por pesquisadores do CBPF, PUC-Rio, UFRJ e UNB, tem atuado em todas as etapas de preparação, construçãO e operação do equipamento. Serão apresentadas as atividades desenvolvidas durante o ano de 2021.
The ALPHA experiment aims at precise tests of fundamental Physics, using very-low energy, spatially confined samples of antihydrogen (Hbar) atoms. In 2021 we published the first observation of laser cooling of antimatter atoms, and the reduced temperature of Hbar sample will allow a more precise spectroscopic measurement of the 1S - 2S transition. A comparison with similar measurements...
The Pierre Auger Observatory is the largest facility ever constructed to study ultrahigh-energy cosmic rays. Its main goal is to get clues about the nature and origin of the highest-energy cosmic rays observed so far - above $10^{18}$ eV. The Auger Observatory is situated at a privileged location in the Argentinean pampas, near the town of Malargüe (35.2$^{\circ}$S) at 1400 m above sea level....
A física de neutrinos é um dos campos mais ativos da física de partículas, com várias questões fundamentais ainda não respondidas. Nos últimos anos, a detecção do espalhamento elástico coerente de neutrinos em núcleos tem ganhado um forte interesse por ser um dos processos nos quais é possível por um lado observar física além do modelo padrão e por outro permite desenvolver uma nova tecnologia...
Apresentaremos o status atual de DUNE e as contribruiçōes brasileiras para o experimento.
In this talk, I am going to review the participation of some brazilians groups in the Cherenkov Telescope Array Observatory (CTA). I am going to discuss the participation in instrumentation and proposal of data analysis. I am going to show the participation of the brazilian industry in building the telescopes and producing innovation. The interface between astrophysics and particle physics,...
A Colaboração Latin American Giant Observatory (LAGO) é um observatório de astropartículas distribuído por países da América Latina. O objetivo científico da colaboração é a pesquisa básica em três ramos da física de astropartículas: o universo extremo, fenômenos do clima espacial, e radiação ionizante no nível do solo terrestre. A rede de detectores da LAGO consiste em water-Cherenkov...
The Giant Radio Array for Neutrino Detection (GRAND) is a planned observatory whose main goal is to study the Universe at ultra-high energies. GRAND will detect UHE cosmic rays, gamma rays, and neutrinos with unprecedented sensitivity. Using large arrays of antennas, GRAND will detect the radio emission from extensive air showers initiated by cosmic particles impinging on the atmosphere....
The Southern Wide-field Gamma-ray Observatory (SWGO) Collaboration, founded in 2019, is currently engaged in the design and prototyping work towards the realisation of this future high-altitude gamma-ray facility, to be installed above 4.5 km in the Andes, in South America. SWGO will complement CTA and the existing ground-based particle detectors of the Northern Hemisphere (HAWC and LHAASO)...
When observed with high-energy probes, atomic nuclei are complex objects. The number of quarks and gluons, and their distribution within the nucleus vary depending on the energy and virtuality of the probe used to measure them. In this talk, I will discuss the use of high-enerygy photons, from either ultra-peripheral collisions (UPCs) of heavy nuclei, at RHIC and the LHC, and at the...
An overview of recent progress in high-energy astroparticle physics is given by discussing a number of key observations and puzzles. The interplay of astrophysics and particle physics needed for understanding these phenomena is illustrated
and open questions, motivating new experimental and theoretical work, are pointed out.
Eu vou discutir a importância da descoberta da massa do neutrino e o potencial das experiências de oscilações de neutrinos para revelar mais sobre a física além do modelo padrão.
Foi proposta em 1988 uma generalização da mecânica estatística de Boltzmann-Gibbs (BG) usando como base uma entropia não aditiva Sq, cujo índice q é um numero real (q=1 recupera a mecânica estatística de BG). Esta generalização tem encontrado muitas aplicações em física de altas energias e plasmas. Após uma breve introdução, apresentamos um resultado obtido por Deppman, Mejias e Menezes (PRD...
Comparações entre resultados do experimento LHCb e previsões teóricas para produção exclusiva do méson vetorial J/$\psi$ em colisões pp e PbPb serão apresentadas. Também discutiremos perspectivas de análises de dados propostas para o experimento LHCb em trabalhos de fenomenologia relacionados à Física difrativa.
One of the main concerns of experimental astroparticle physics is to characterize and measure the fluxes of different particle species of cosmic origin that arrive at Earth. In the most energetic regimes (above $10^{15}$ eV for the charged component of cosmic rays and $10^{11}$ eV for gamma rays), only arrays of detectors deployed at the ground and with large collection areas (hundreds to...
Hybrid simulations, where different models are coupled to simulate the space-time evolution of relativistic
heavy ion collisions, constitute the most modern tools for computational studies of the QGP. In such simulations,
the hydrodynamic code requires an entropy density distribution of the system as an input, and in the process of
converting the two colliding nuclei into such an entropy...
We analyze the electroweak interactions in the framework of the Higgs effective field theory using the available Higgs and electroweak diboson production results from LHC run 2 as well as the electroweak precision data. Assuming universality of the weak current, our study considers 25 possible anomalous couplings. To unveil the nature of the Higgs boson, i.e., isosinglet versus part of...
The Quark-Gluon Plasma, a new state of matter characterized by its extreme energy density
and temperature generated in heavy-ion collision experiments, is expected to modify hard-scattered
partons traveling through it and, consequently, the jets they produce. Analyses regarding jets
may recover information about the medium and its partonic energy-loss mechanism. This work
applies the Monte...
The Cherenkov Telescope Array (CTA) is the next-generation ground-based observatory
for gamma-ray astronomy, covering a very broad energy range from 20 GeV to beyond 100 TeV. In this work, we are probing the potential of the CTA observatory, through its planned extragalactic survey, in detecting BL Lac sources. The population of these AGNs is being simulated according to a luminosity function...
Astrophysical observations of high-energy gamma-rays play a crucial role in the exploration of non-thermal phenomena in the Universe in their most extreme and violent forms. It can also provide unique information about exotic Particle Physics phenomena beyond the Standard Model of Particle Physics, which complements the studies performed at particle accelerators such as the Large Hadron...
Many systems in nature are subjected to thermal effects, i.e., where the environment temperature $T \neq 0$. Likewise, in the presence of conserved charges, chemical potentials can also be present. In this work, we are interested in systems at high temperatures, a condition that prevail in the primordial Universe, and also dense ones, like in the case of compact stars, materials with a well...
The SPRACE group has been involved in the the search of physics beyond the standard model since the beginning of the CMS operation. We have studied a myriad of possible new models, exploring several signatures in the detector.
Currently, one of the most promise indicative of new physics is the existence of Dark Matter. Its conexion with particle physics, how it interacts (if it interact at...
A invariância de Lorentz é uma das principais simetrias que governam o Modelo Padrão de partículas elementares. Todavia, diversos modelos teóricos para uma grande unificação acomodam ou até mesmo impõe certo nível de violação da invariância de Lorentz (VIL). Efeitos significativos são esperados apenas nas mais altas energias. Astropartículas estão entre os eventos mais energéticos conhecidos...
The the Standard Model (SM) has shown a remarkable success describing processes observed at TeV scale at the LHC, including the experimental confirmation of a particle consistent with the SM Higgs boson by the ATLAS and CMS experiments.
However, there are still puzzling questions defying these accomplishments, such as the hierarchy problem, the matter-antimatter asymmetry, the origin of CP...
In high energy heavy ion collisions, a strongly interacting system is formed, called Quark Gluon Plasma (QGP), that behaves similar to a low viscosity fluid in fast expansion. Many experimental results are well described by hydrodynamics models, thus it is to be expected that this medium is also subject to typical hydrodynamic phenomena, like vorticity. Based on this concept, in this work, we...
Abelian U(1) gauge group extensions of the Standard Model represent one of the most minimal approaches to solve some of the most urgent particle physics questions and provide a rich phenomenology in various experimental searches. In this work, we focus on baryophilic vector mediator models in the MeV-to-GeV mass range and, in particular, present, for the first time, gauge vector field decays...
This talk will review the measurements of hard-diffractive dijet production and hard color-singlet exchange in dijet events from special data taken with a high-$\beta^{\ast}$ LHC optics configuration and low instanteneous luminosity.
Additionally, the measurements of central exclusive production (CEP) with the CMS Precision Proton Spectrometer (PPS) will be presented: high-mass dilepton...
In this presentation, we describe recent work from SPRACE team [1] on physics analyses using data collected by the CMS experiment at the LHC. The studies are performed by measuring particle correlations produced in small and large colliding systems to access information about the space-time evolution of the particle emitting source, the final state interactions between hadrons, and the...
Ultra-relativistic heavy-ion collisions are currently best
understood via complex, multi-staged hybrid hydrodynamic
simulations. Recently, the potentially large parameter space
associated with these simulations started to being constrained
by means of Bayesian analysis that considered only data measured
at typical centralities. A decade-old long puzzle is the failure
of any simulation...
Currently, we are living in the precision era of neutrino physics since several fundamental parameters which describe the flavor mixing of the standard 3 flavors of neutrinos such as mixing angles and mass squared differences have been and are being measured with a few percent precisions by many experiments. In the next decade, it is expected that due to several new large scale experiments...
In this talk we present results on the search for Higgs boson pair production ($HH$) in the $b\bar{b}\tau^{+}\tau^{-}$ final state. The search uses 139 fb$^{-1}$ of $pp$ collision data recorded by the ATLAS experiment between 2015-2018 with a center of mass energy of $\sqrt{s} = 13$ TeV. This amount represents only 4\% of the collision data expected to be available during the LHC lifetime,...
The LHC experiments have focused part of its physics goals into the particle production in exclusive processes in order to improve our understanding of the Standard Model (SM) and search for signals of New Physics. Exclusive production means that the final state is composed only by the centrally produced particle $X$, with large rapidity gaps with no tracks between the...
Abstract of the ALP search - ATLAS Experiment
Apresentarei os planos para a nucleação de uma nova linha de pesquisa e de trabalho a serem desenvolvidos no Centro Brasileiro de Pesquisas Físicas - CBPF no Rio de Janeiro. Esse novo núcleo trabalhará com a Física de Íons Pesados e com o calorímetro eletromagnético (ECAL) do Solenóide Compacto de Múons (CMS), um dos experimentos do LHC no CERN. Esse projeto abarca temas de ponta, muito...
Quais são os possíveis caminhos de cooperação entre a Física de Altas Energias e as empresas brasileiras?
The ALPHA Collaboration currently operates 2 different experimental apparatus for antihydrogen (Hbar) studies: ALPHA-2 is dedicated to precision spectroscopic measurements (both in the optical and in the microwave regions of the spectrum) while ALPHA-g was designed for gravitational experiments. In this talk, I will review some of the recent contributions of the Brazilian team to the...
O Experimento ATLAS produz um volume de dados bastante elevado, devido à sua fina segmentação (maior do que 60 TB/s). Visando sua operação nas condições ainda mais desafiadoras do HL-LHC, o ATLAS passa por um extenso programa de upgrade, que teve sua segunda fase encerrada no início de 2022 e uma nova fase planejada para a partir de 2025. A operação e os novos desenvolvimentos do ATLAS são...
Com o aumento da luminosidade no LHC, a taxa de falsos múons (produzidos fora dos vértices de colisão) cresceu de tal modo que a banda passante do experimento poderia ser comprometida. Uma parte significativa da taxa de triggers de múons acontece nas extremidades do detector (tampas - end-caps). Partículas de baixa energia (principalmente prótons) produzem falsos triggers ao atingirem as...
The Cherenkov Telescope Array (CTA) will be the world's next generation of very high energy gamma-ray telescopes, composed of more than 100 telescopes installed in both hemispheres, with one of the sites in La Palma, in the Canary Islands, and another in Paranal, in northern Chile. The CTA is formed by an international consortium with more than 1,500 members from more than 150 institutes in 25...
Os calorímetros desempenham um papel importante na seleção (trigger) online e na análise offline em experimentos modernos e também devem trazer informações importantes para experimentos futuros, como no High-Luminosity Large Hadron Collider (HL-LHC) e no Future proton-proton Circular Collider (FCC-pp). Esses novos calorímetros enfrentarão condições extremamente rigorosas, pois espera-se...
The High-Luminosity LHC (HL-LHC) will usher a new era in high-energy physics. The HL-LHC experimental conditions entail an instantaneous luminosity of up to 75 Hz/nb and up to 200 simultaneous collisions per bunch crossing (pileup). To cope with those conditions, the CMS detector will undergo a series of improvements, in what is known as the Phase-2 upgrade. In particular, the upgrade of the...
Durante o ano de 2021, o grupo de Física Experimental de Altas energias do Instituto de Física da UFRGS atuou na preparação do Experimento ALICE para a terceira tomada de dados do LHC. Teve foco na preparação dos elementos de reconstrução e análise dos dados do novo detector Muon Forward Tracker (MFT) e pareamento com o espectrômetro de múons. O grupo foi responsável pela implementação da...
The upgrade phase II of the RPC Link system is ongoing to meet all requirements for the HL-LHC. Capability to work in a high radiation environment, improvement of timing resolution, and increasing the incoming rate capability of system and output bandwidth of system are the main goals of this project. In this project, the new RPC Back-End electronics which is a new scope in this era also will...
O calorímetro de Telhas (TileCal) é o principal calorímetro hadrônico do experimento ATLAS no LHC. No TileCal, aproximadamente 10.000 canais de leitura respondem a cada colisão, e a informação da energia de cada sinal produzido é medida pela estimativa da amplitude do pulso processado e digitalizado. Em condições de operação em alta luminosidade, conforme está previsto para o HL-LHC, o sinal...
Para acompanhar os avanços científicos sem precedentes das técnicas de raios X utilizando síncrotron de quarta geração, foi necessário extrapolar os limites da tecnologia de detector para sensores capazes de contar fótons a taxas mais elevadas e em uma ampla gama de energias. Atualmente, detectores pixelados com baixo ruído eletrônico, capazes de operar no regime de altas taxas de contagem de...
O LHC prevê um aumento crescente da sua luminosidade, o que irá gerar uma maior ocupação nos sistemas de leitura dos seus experimentos. Muitos dos processos físicos de interesse resultam em decaimentos em elétrons, fótons que são medidos pelos diversos subsistemas. Atualmente, o Experimento ATLAS passa por um extenso programa de upgrade, envolvendo os calorímetros e sistemas de monitoração e...
BR-SP-SPRACE is a Tier 2 of the WorldWide LHC Computing Grid (WLCG) which processes, analyzes and stores data generated by the Compact Muon Solenoid(CMS) experiment. We will present a brief status of the cluster after the Run-2 of the experiment and what to expect for the Run-3 data processing.
This presentation summarizes the research on the developments of Micro-Patterned Gaseous Detectors (MPGDs) conducted at the High-Energy Physics Instrumentation Center of the University of São Paulo (HEPIC-USP). We are exploiting different techniques for developing local expertise to produce Gas Electron Multiplier (GEM). Besides, the search for a deeper understanding of the degradation and...
In the past years a collaboration has been set between our group (HEPIC@IFUSP) of the USP Physics Institute and the Sistemas Eletrônicos Integrados group of the USP Polytechnic School (EPUSP), making possible the development of a front-end ASIC, named SAMPA, for the readout of gaseous detectors. The ASIC was originally developed to instrument the new Gas Electron Multiplier (GEM) readout plane...
Nesta apresentação abordaremos o planejamento e os resultados obtidos em uma demonstração de transferência de dados em alta velocidade entre as Tiers-2 do CMS em São Paulo (SPRACE-UNESP) e em Lisboa (LIP-INCD) através do cabo submarino Ellalink, que conecta o Brasil diretamente à Europa. Servidores instalados nas duas Tiers-2 foram diretamente conectados a 100Gbps, e o limite da banda...
The CMS group at UERJ has been an integral part of the Precision Proton Spectrometer (PPS) subsystem project of the collaboration.
The PPS detector system has been installed and integrated into the CMS experiment since 2016 and has collected over $110\,\text{fb}^{-1}$ of data during the LHC Run 2.
It is a joint project of the CMS and TOTEM collaborations with the capability of measuring...
O Experimento ATLAS possui um sistema de trigger dividido em dois níveis, sendo o primeiro nível (Level 1 - L1) implementado em hardware e o segundo (High Level Trigger - HLT) construído em um sistema de computação distribuída. O HLT é constituído por duas etapas de processamento: Rápida e Precisa. Em ambas as etapas, existe uma forte dependência da qualidade da medição de energia feita...
The speed-up of generation of simulated collision events is of utmost importance for the benefit of the HEP community. Currently, almost all event simulations are done with the Geant4 framework, which can take minutes for complex events like those expected at the HL-LHC. Previous work in that area has resulted in approaches like the ATLAS FastCaloSim and the CMS FastSim, in which the authors...
OpenIPMC-HW is an open-source Intelligent Platform Management Controller (IPMC) hardware mezzanine designed for use in boards compliant to the Advanced Telecommunications Computing Architecture (ATCA) standard, such as those under development for use in the upgrades of the back-end electronics of High-Luminosity LHC experiments. The mezzanine is designed in a mini-DIMM form factor and is based...
The detection of cosmic rays using simple apparatuses for quantitative data-taking has been explored over the years by several initiatives around the world for outreach and experimental High Energy Physics instrumentation teaching. The possibility to connect geographically dispersed stations synchronized by a GPS timing signal allows for a larger detection area suitable for the identification...
During Large Hadron Collider's (LHC) second Long Shutdown (LS2, 2018-2022) the trigger system from ATLAS's Liquid Argon Calorimeters went through a significant upgrade. The so called Phase-I upgrade is aimed to enhance the physics reach of the experiment during the upcoming operation at increasing LHC luminosities.
The ATLAS experiment operated during the Run 2 data taking period...
The High Luminosity LHC (HL-LHC) will allow its experiments to perform high precision measurements in the Standard Model, explore new regions of the phase space and search for signals of new physics through very rare processes. Colliding proton beams at $\sqrt{s}$ = 14TeV, the HL-LHC will reach an instantaneous luminosity of $7.5\times10^{34}$/cm²s. With 200 simultaneous collisions per bunch...
