Conveners
Análise de Dados: Paralela 1
- Jun Takahashi (University of Campinas UNICAMP (BR))
Análise de Dados: Paralela 2
- Jun Takahashi (University of Campinas UNICAMP (BR))
Análise de Dados: Paralela 3
- Jun Takahashi (University of Campinas UNICAMP (BR))
Análise de Dados: Paralela 4
- Jun Takahashi (University of Campinas UNICAMP (BR))
In this talk we present a search for resonant and non-resonant Higgs boson pair-production decaying to $\mathbf{b\bar{b}\tau^+\tau^-}$, considering the semi-leptonic and fully hadronic final states of the $\tau$-leptons. The analysis uses 36.1 fb$^{-1}$ of data collected by the ATLAS experiment at the LHC in 2015 and 2016 at a centre-of-mass energy of $\sqrt{s} =$ 13 TeV. The inclusion of...
The proton-proton collisions, at the Large Hadron Collider (LHC), are confirming properties of the Higgs Boson predicted by Standard Model (SM) and providing tools for observation of all Higgs decay channels. The dibosonic decays, despite their low branching ratios, are well understood and have lead the Higgs discovery. In the Run 2 conditions many results have shown considerable agreement...
The discovery of the Higgs boson in 2012 provided confirmation of the proposed mechanism of EWSB and also heralded a new era of precision Higgs physics. This CMS analysis presents measurement of the Higgs boson production rate in vector boson fusion(VBF) mode, decaying into WW→2l2ν and ZZ→4l channels. With gauge boson couplings in both the production and decay vertices, a VBF measurement...
The ATLAS experiment is conducting several high precision measurements in the Standard Model, providing stringent tests of QCD theoretical predictions and constraining the models describing the parton distribution function of the proton. In this talk, we will discuss some measurements of inclusive vector boson production as well as the production of vector bosons associated with heavy flavor...
LHCb, while purpose built for b-physics, also functions as a general purpose forward detector, covering the pseudo-rapidity range 2.0 to 5.0. A wide variety of forward production measurements, used to constrain the proton PDFs, have been performed using the datasets collected in Runs 1 and 2 of the LHC. These include measurements of jet production which will be presented, highlighting the...
The installation of scintillating pad detectors (Herschel), bracketing the LHCb detector along the beamline, have significantly enhanced LHCb's sensitivity to central exclusive production. Additionally, dedicated triggers during the early measurement period of Run 2 have produced an extended CEP dataset. A summary of results from Run 1 as well as early results from Run 2 will be shown.
The high-energy proton-proton collisions at the LHC can be used to investigate the electromagnetic interactions as a photon collider. Such production mechanism considers the long-range interactions via photon fusion, which allowed the CMS Collaboration to study the two-photon production of dileptons and dibosons at 7 and 8 TeV. In particular, the kinematics accessible by the CMS detector also...
The research activities developed by the heavy ions group of the São Paulo Research and Analysis Center (SPRACE) during the recent years in high energy collisions will be reported and discussed.
A evolução da matéria nuclear fortemente interagente resultante de colisões nucleares de íons pesados em energias relativísticas é descrita em uma sequência de etapas. Uma importante etapa é a descrição da matéria através de hidrodinâmica relativística dissipativa, que parece ser válida no intervalo de tempo compreendido entre cerca de 1fm/c a 10 fm/c após a colisão. O código MUSIC, capaz de...
Recent studies of high-multiplicity proton-proton (pp) collisions at the LHC have shown that, in these systems, relative resonance production is reduced with respect to minimum-bias interactions. In this work, we present a phenomenological study that shows how multi-parton interactions and color reconnection (CR) affect res- onance yields in the PYTHIA8 event generator. It is observed that CR...
Quarks pesados (charm e beauty) são produzidos nos estágios iniciais das colisões devido às suas massas grandes. Isso permite que eles sofram efeitos da evolução completa do sistema, interagindo com o Plasma Quark-Gluon (QGP) criado em colisões de íons pesados (Pb-Pb) de alta energia. Em colisões de p-Pb, os efeitos da matéria nuclear fria (cold nuclear matter) podem modificar a produção...
A strongly interacting state of matter known as the Quark-Gluon Plasma (QGP) is formed in the high temperature and energy density conditions reached in ultra-relativistic heavy-ion collisions. Historically, one of the signatures of the formation of such a system was the enhanced production of strange and multi-strange hadrons with respect to non-strange. The ALICE detector is ideally suited to...
The CMS-TOTEM PPS (Precision Proton Spectrometer) detector system consists of silicon tracking stations as well as timing detectors to measure both the position and direction of protons and their time-of-flight with high precision. They are located at around 200 m from the interaction point in the very forward region on both sides of the CMS experiment. PPS is built to study Central Exclusive...
The CMS and TOTEM experiments have jointly collected data from pp collisions at $\sqrt{s}$ = 13 TeV in a special LHC run at the end of 2015. We discuss a preliminary analysis concerning the possibility of observation of diffractive open charm mesons in the channels $D^{+*}\rightarrow D^{0} + \pi^{+} \rightarrow K^{+} + \pi^{-} + \pi^{+}$ (c.c) and $D^{0} \rightarrow K^{+} + \pi^{-}$ (c.c)...
One of the most important approaches to the possibility of new physics Beyond the Standard Model is the use of Effective Field Theory (EFT) to describe higher energy theoretical models at lower energies, like that of the LHC. In this type of scenario, it is possible to have additional couplings to describe gauge bosons self-interactions, such as anomalous Triple (aTGC) and Quartic Gauge...
This analysis is set in the context of the Supersymmetric Compressed Scenarios, characterized by a very high compression in the mass spectrum of the gauginos and higgsinos below the TeV scale, while the scalar superpartners are out of reach of the LHC experiment. We use CMS Run II data with a center-of-mass energy of $\sqrt{s}=13\, \mathrm{TeV}$ to perform a search on a promising channel...
The São Paulo Research and Analysis Center (SPRACE) is actively working on the analyses of the data collected by CMS. One of our main interest is the search for physics beyond standard model. In this talk we will show the efforts of the SPRACE group on the search for new diboson resonances at the CMS experiment.
With the discovery of the H boson by ATLAS and CMS collaborations in 2012,...
The São Paulo Research and Analysis Center (SPRACE) is actively working on the analyses of the data collected by CMS. One of our main interest is the search for physics beyond standard model. In this talk we will show the efforts of the SPRACE group on the search for Dark Matter
particles at the CMS experiment.
Experimental evidences of the existence of Dark Matter have come only from...
O grupo de Física do Charm do LHCb-Rio, formado em 2008
por pesquisadores da PUC, UFRJ e CBPF, tem como linhas
de pesquisa o estudo da violação de CP e de interações
hadrônicas a baixas energias, usando para tal os
decaimentos de mésons D+ e Ds+ em três mésons leves carregados.
Apresentamos os resultados já obtidos pelo grupo bem como
os estudos em andamento e projetos futuros.
O decaimento do m ́eson B carregado em trˆes ha ́drons (p ́ıons ou ka ́ons) no estado final oferece um ́otimo ambiente para o estudo do fenoˆmeno de viola ̧ca ̃o da simetria de Carga-Paridade (ACP ). Al ́em de prover informa ̧co ̃es para uma melhor compreens ̃ao da dinaˆmica dos decaimentos hadrˆonicos do m ́eson B. Dentro deste contexto, a apresenta ̧c ̃ao ira ́ focar nos decaimentos...
The analysis of charmless decays $B^{\pm}\rightarrow
h_1^{\pm}h_2^{+}h_3^{-}$, where $h_i$ are pions or kaons, collected by
LHCb in Run I, show strong evidence for CP asymmetries in the
three-body phase space. We are now analyzing data collected in Run II
(2015+2016) and will combine the results with the ones from Run I. After
a loose pre-selection, we use a multivariate method (MVA) to...
O GooFit, um framework para realizar ajustes pelo método de máxima verossimilhança utilizando GPUs, nos permite determinar amplitudes em decaimentos de três corpos, como o Ds+→ π- π+ π+, independentemente de modelos. A amplitude a ser determinada é representada por uma função complexa genérica, definida em pontos fixos no espectro de massa invariante por pares de números reais, que são os...
Coherent elastic neutrino-nucleus scattering (CEnNS) is an interaction process that was predicted by the Standard Model but only recently was observed. Although its cross-section is coherently enhanced at low neutrino energies, the resulting keV-range nuclear recoil energies are below the thresholds of most detectors. The detection of coherent scattering with different experimental techniques...
