W. Carvalho
A5079427051- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Computational Physics and Python Applications
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Medical Imaging Techniques and Applications
- Particle Accelerators and Free-Electron Lasers
- Radiation Detection and Scintillator Technologies
- Nuclear physics research studies
- Distributed and Parallel Computing Systems
- Gamma-ray bursts and supernovae
- Atomic and Subatomic Physics Research
- Nuclear reactor physics and engineering
- Radiation Therapy and Dosimetry
- International Science and Diplomacy
- Big Data Technologies and Applications
- Algorithms and Data Compression
- Superconducting Materials and Applications
- Radiomics and Machine Learning in Medical Imaging
- Advanced Data Storage Technologies
Universidade do Estado do Rio de Janeiro
2016-2025
Institute of High Energy Physics
2014-2024
A. Alikhanyan National Laboratory
2022-2024
Development Agency of Serbia
2024
University of Antwerp
2024
San Antonio College
2024
Universidade Estadual Paulista (Unesp)
2009-2023
Vilnius University
2022-2023
National Institute of Chemical Physics and Biophysics
2021-2022
Centro Brasileiro de Pesquisas Físicas
1996-2018
We report the observation of X(3872) in J/psipi(+)pi(-) channel, with J/psi decaying to mu(+)mu(-), pp collisions at sqrt[s]=1.96 TeV. Using approximately 230 pb(-1) data collected Run II D0 detector, we observe 522+/-100 candidates. The mass difference between state and is measured be 774.9+/-3.1(stat)+/-3.0(syst) MeV/c(2). have investigated production decay characteristics find them similar those psi(2S) state.
We report observation of the electroweak production single top quarks in $p\overline{p}$ collisions at $\sqrt{s}=1.96\text{ }\text{ }\mathrm{TeV}$ based on $2.3\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data collected by D0 detector Fermilab Tevatron Collider. Using events containing an isolated electron or muon and missing transverse energy, together with jets originating from fragmentation $b$ quarks, we measure a cross section...
In July 2012, the ATLAS and CMS collaborations at CERN Large Hadron Collider announced observation of a Higgs boson mass around 125 gigaelectronvolts. Ten years later, with data corresponding to production 30-times larger number bosons, we have learnt much more about properties boson. The experiment has observed in numerous fermionic bosonic decay channels, established its spin-parity quantum numbers, determined measured cross-sections various modes. Here Collaboration reports most...
We report on a measurement of the inclusive jet cross section in pp[over ] collisions at center-of-mass energy sqrt[s]=1.96 TeV using data collected by D0 experiment Fermilab Tevatron Collider corresponding to an integrated luminosity 0.70 fb;{-1}. The cover transverse momenta from 50 600 GeV and rapidities range -2.4 2.4. Detailed studies correlations between systematic uncertainties momentum rapidity are presented, measurements found be good agreement with next-to-leading order QCD calculations.
At the start of Run 2 in 2015, LHC delivered proton-proton collisions at a center-of-mass energy 13 TeV. During (years 2015-2018) eventually reached luminosity 2.1 $\times$ 10$^{34}$ cm$^{-2}$ s$^{-1}$, almost three times that during 1 (2009-2013) and factor two larger than design value, leading to events with up mean about 50 simultaneous inelastic per bunch crossing (pileup). The CMS Level-1 trigger was upgraded prior 2016 improve selection physics challenging conditions posed by second...
Measurements are presented of the Bs0→μ+μ− branching fraction and effective lifetime, as well results a search for B0→μ+μ− decay in proton-proton collisions at s=13TeV LHC. The analysis is based on data collected with CMS detector 2016–2018 corresponding to an integrated luminosity 140fb−1. Bs0 meson lifetime most precise single measurements date. No evidence has been found. All found be consistent standard model predictions previous measurements.
A bstract Three searches are presented for signatures of physics beyond the standard model (SM) in ττ final states proton-proton collisions at LHC, using a data sample collected with CMS detector $$ \sqrt{s} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 TeV, corresponding to an integrated luminosity 138 fb − 1 . Upper limits 95% confidence level (CL) set on products branching fraction decay into τ leptons and cross...
A search is reported for near-threshold structures in the <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mi>J</a:mi><a:mo>/</a:mo><a:mi>ψ</a:mi><a:mi>J</a:mi><a:mo>/</a:mo><a:mi>ψ</a:mi></a:mrow></a:math> invariant mass spectrum produced proton-proton collisions at <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mrow><c:msqrt><c:mrow><c:mi>s</c:mi></c:mrow></c:msqrt><c:mo>=</c:mo><c:mn>13</c:mn><c:mtext> </c:mtext><c:mtext>...
Abstract This paper describes the Combine software package used for statistical analyses by CMS Collaboration. The package, originally designed to perform searches a Higgs boson and combined analysis of those searches, has evolved become tool presently in majority measurements performed It is not specific experiment, this intended serve as reference users outside Collaboration, providing an outline most salient features capabilities. Readers are provided with possibility run reproduce...
We present the first measurement of integrated forward-backward charge asymmetry in top-quark–top-antiquark pair (t¯t) production proton-antiproton (p¯p) collisions lepton+jets final state. Using a b-jet tagging algorithm and kinematic reconstruction assuming t¯t+X decay, sample 0.9 fb−1 data, collected by D0 experiment at Fermilab Tevatron Collider, is used to measure for different jet multiplicities. The result also set upper limits on via Z′ resonance.Received 7 December...
From an analysis of the flavor-tagged decay ${B}_{s}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}\ensuremath{\phi}$ we obtain width difference between ${B}_{s}^{0}$ light and heavy mass eigenstates, $\ensuremath{\Delta}{\ensuremath{\Gamma}}_{s}=0.19\ifmmode\pm\else\textpm\fi{}0.07(\mathrm{stat}{)}_{\ensuremath{-}0.01}^{+0.02}(\mathrm{syst})\text{ }\text{ }{\mathrm{ps}}^{\ensuremath{-}1}$, $CP$-violating phase,...
We report results of a study the ${B}_{s}^{0}$ oscillation frequency using large sample semileptonic decays corresponding to approximately $1\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ integrated luminosity collected by D0 experiment at Fermilab Tevatron Collider in 2002--2006. The amplitude method gives lower limit on $14.8\text{ }{\mathrm{ps}}^{\ensuremath{-}1}$ 95% C.L. At $\ensuremath{\Delta}{m}_{s}=19\text{ }{\mathrm{ps}}^{\ensuremath{-}1}$, deviates from hypothesis $\mathcal{A}=0$...
We present a search for charged Higgs bosons in top quark decays. analyze the \eplus, \muplus, $ee$, $eμ$, $μμ$, \etau and \mutau final states from pair production events, using data about 1${\text{fb}}^{-1}$ of integrated luminosity recorded by \dzero experiment at Fermilab Tevatron Collider. consider different scenarios possible boson decays, one where decays purely hadronically into charm strange quark, another it $τ$ lepton neutrino third both appear. extract limits on branching ratio...
Abstract Production cross sections of the Higgs boson are measured in $${\mathrm{H}} \rightarrow {\mathrm{Z}} 4\ell $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>H</mml:mi> <mml:mo>→</mml:mo> <mml:mi>Z</mml:mi> <mml:mn>4</mml:mn> <mml:mi>ℓ</mml:mi> </mml:mrow> </mml:math> ( $$\ell ={\mathrm{e}},{{{\upmu }}_{\mathrm{}}^{\mathrm{}}} <mml:mo>=</mml:mo> <mml:mi>e</mml:mi> <mml:mo>,</mml:mo> <mml:msubsup> <mml:mi>μ</mml:mi> <mml:mrow/> </mml:msubsup> ) decay...
A bstract search is presented for vector-like T and B quark-antiquark pairs produced in proton-proton collisions at a center-of-mass energy of 13 TeV. Data were collected by the CMS experiment CERN LHC 2016–2018, with an integrated luminosity 138 fb − 1 . Events are separated into single-lepton, same-sign charge dilepton, multi-lepton channels. In analysis single-lepton channel multilayer neural network jet identification techniques employed to select signal events, while dilepton...
Decays of $Z$ bosons to charm quark-antiquark pairs have been observed for the first time at a hadron collider, as part search decays Higgs pairs, which are bounded 14 times standard model value.
A search for decays to invisible particles of Higgs bosons produced in association with a top-antitop quark pair or vector boson, which both decay fully hadronic final state, has been performed using proton-proton collision data collected at s=13TeV by the CMS experiment LHC, corresponding an integrated luminosity 138fb-1. The 95% confidence level upper limit set on branching fraction 125GeV boson particles, B(H→inv), is 0.54 (0.39 expected), assuming standard model production cross...
Energy correlators that describe energy-weighted distances between two or three particles in a hadronic jet are measured using an event sample of sqrt[s]=13 TeV proton-proton collisions collected by the CMS experiment and corresponding to integrated luminosity 36.3 fb^{-1}. The distributions consistent with trends simulation reveal key features strong interaction: confinement asymptotic freedom. By comparing ratio three- two-particle energy correlator theoretical calculations resum collinear...
We present a measurement of the shape boson rapidity distribution for $p\overline{p}\ensuremath{\rightarrow}Z/{\ensuremath{\gamma}}^{*}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}+X$ events at center-of-mass energy 1.96 TeV. The is made with electron-positron mass $71<{M}_{ee}<111\text{ }\text{ }\mathrm{GeV}$ and uses $0.4\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data collected Fermilab Tevatron collider D0 detector. This significantly reduces uncertainties on in forward region...
The D0 Collaboration has performed a measurement of the top quark mass mt based on six candidate events for process tt¯→bW+b¯W−, where W bosons decay to eν or μν. This sample was collected during an exposure detector integrated luminosity 125pb−1 s=1.8TeVpp¯ collisions. We obtain mt=168.4±12.3(stat)±3.6(syst)GeV/c2, consistent with obtained using single-lepton events. Combination and dilepton results yields mt=172.0±7.5GeV/c2.Received 16 June...
We present first evidence for the production of single top quarks in D0 detector at Fermilab Tevatron ppbar collider. The standard model predicts that electroweak interaction can produce a quark together with an antibottom or light quark, without antiparticle partner is always produced from strong coupling processes. Top were observed pair 1995, and since then, has been searched ever larger datasets. In this analysis, we select events 0.9 fb-1 dataset have electron muon missing transverse...
We present a measurement of the shape $Z/{\ensuremath{\gamma}}^{*}$ boson transverse momentum (${q}_{T}$) distribution in $p\overline{p}\ensuremath{\rightarrow}Z/{\ensuremath{\gamma}}^{*}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}+X$ events at center-of-mass energy 1.96 TeV using $0.98\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data collected with D0 detector Fermilab Tevatron collider. The are found to be consistent resummation prediction low ${q}_{T}$, but above perturbative...
The D0 Collaboration presents first evidence for the production of single top quarks at Fermilab Tevatron pp¯ collider. Using a 0.9 fb−1 dataset, we apply multivariate analysis to separate signal from background and measure σ(pp¯→tb+X,tqb+X)=4.9±1.4 pb. probability cross section this value or higher in absence is 0.035%, corresponding 3.4 standard deviation significance. We use measurement directly determine Cabibbo-Kobayashi-Maskawa matrix element that describes Wtb coupling find...