L. De Paula
A5000154066- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Computational Physics and Python Applications
- Black Holes and Theoretical Physics
- Particle Accelerators and Free-Electron Lasers
- Medical Imaging Techniques and Applications
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Nuclear physics research studies
- Stochastic processes and statistical mechanics
- Radiation Detection and Scintillator Technologies
- Astrophysics and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Particle accelerators and beam dynamics
- Distributed and Parallel Computing Systems
- International Science and Diplomacy
- Algorithms and Data Compression
- Advanced Data Storage Technologies
- Radioactive Decay and Measurement Techniques
- advanced mathematical theories
- Markov Chains and Monte Carlo Methods
Universidade Federal do Rio de Janeiro
2016-2025
Istituto Nazionale di Fisica Nucleare, Sezione di Bari
2014-2025
University of Bari Aldo Moro
2025
Centro Brasileiro de Pesquisas Físicas
2014-2024
University of Padua
1990-2023
Tsinghua University
2023
Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
2013-2021
Hospital Universitari Sant Joan de Reus
2018-2020
Cultura
2020
Instituto de Salud Carlos III
2018
The LHCb experiment is dedicated to precision measurements of CP violation and rare decays B hadrons at the Large Hadron Collider (LHC) CERN (Geneva). initial configuration expected performance detector associated systems, as established by test beam simulation studies, described.
This paper presents the design of LHCb trigger and its performance on data taken at LHC in 2011. A principal goal is to perform flavour physics measurements, designed distinguish charm beauty decays from light quark background. Using a combination lepton identification measurements particles' transverse momenta selects particles originating hadrons, which typically fly finite distance before decaying. The reduces roughly 11 MHz bunch-bunch crossings that contain least one inelastic pp...
The average lifetime of bottom hadrons was measured with the Mark II vertex detector at storage ring PEP. determined by measuring impact parameters leptons produced in decays. ${\ensuremath{\tau}}_{b}=({12.0}_{\ensuremath{-}3.6}^{+4.5}\ifmmode\pm\else\textpm\fi{}3.0)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}13}$ sec found.
The nature of b-quark jet hadronisation has been investigated using data taken at the Z peak by DELPHI detector LEP. Two complementary methods are used to reconstruct energy weakly decaying b-hadrons, $E_{\mathrm{B}}^{\mathrm{weak}}$ . average value $x^{\mathrm{weak}}_{\mathrm{B}} = E_{\mathrm{B}}^{\mathrm{weak}}/E_{\mathrm{beam}}$ is measured be 0.699±0.011. resulting $x^{\mathrm{weak}}_{\mathrm{B}}$ distribution then analysed in framework two choices for perturbative contribution (parton...
The branching ratios for ${\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\nu}}_{\ensuremath{\tau}}$ and ${\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}(n{\ensuremath{\pi}}^{0}){\ensuremath{\nu}}_{\ensuremath{\tau}}$, $n>~1$, have been measured to be 0.078...
The differential cross sections for lepton pair production in e+e− annihilation at 29 GeV have been measured and found to be good agreement with the standard model of electroweak interaction. With assumption e−μ−τ universality, weak neutral-current couplings are determined ga2=0.23±0.05 gv2=0.03±0.04.Received August 1983DOI:https://doi.org/10.1103/PhysRevLett.51.1941©1983 American Physical Society
A search for pair-produced doubly charged Higgs bosons has been performed using the data collected by DELPHI detector at LEP centre-of-mass energies between 189 and 209 GeV. No excess is observed in with respect to Standard Model background. lower limit mass of 97.3 GeV/c2 95% confidence level set left–right symmetric models any value Yukawa coupling τ leptons.
The total momentum and transverse spectra of electrons in e+e− annihilation at 29 GeV have been measured. inclusive cross section is determined to be 14.4±1.6±5.2 pb for momenta greater than 2 GeV/c. average semielectronic branching ratios charm bottom quarks are measured (6.3±1.2±2.1)% (11.6±2.1±1.7)%, respectively. fragmentation function peaked high z, with 〈z〉b=0.75±0.05±0.04.Received 4 March 1983DOI:https://doi.org/10.1103/PhysRevLett.50.1542©1983 American Physical Society
We observe both the JPC=1++ f1(1285) and JPC=0−+ η’(958) in tagged two-photon interactions untagged interactions. The measured Q2 dependence decay distribution support spin parity assignment. radiative width of is as (M2/Q2)Γγγ*=9.4±2.5±1.7 keV, on assumption a ρ-pole form factor.Received 18 September 1987DOI:https://doi.org/10.1103/PhysRevLett.59.2012©1987 American Physical Society
We confirm the observation of a spin-1 resonance at 1423 MeV in K0SK±π∓ system produced single-tagged two-photon interactions. The Dalitz plot indicates that this decays primarily via K*K intermediate state. measure radiative width times branching ratio BKK¯π(M2/Q2)Γγγ*=3.2±1.4±0.6 keV on assumption ρ-pole form factor.Received 18 September 1987DOI:https://doi.org/10.1103/PhysRevLett.59.2016©1987 American Physical Society
The $\ensuremath{\tau}$ lifetime was measured with the Mark II vertex detector at storage ring PEP. ${\ensuremath{\tau}}_{\ensuremath{\tau}}=(3.20\ifmmode\pm\else\textpm\fi{}0.41\ifmmode\pm\else\textpm\fi{}0.35)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}13}$ sec found, which agrees well $e\ensuremath{-}\ensuremath{\mu}\ensuremath{-}\ensuremath{\tau}$ university.
Single photons detected by the DELPHI experiment at LEP2 in years 1997–2000 are reanalysed to investigate existence of a single extra dimension modified ADD scenario with slightly warped large dimensions. The data collected centre-of-mass energies between 180 and 209 GeV for an integrated luminosity ∼650 pb−1 agree predictions Standard Model allow limit be set on graviton emission one dimension. obtained fundamental mass scale M D is 1.69 TeV/c 2 95% CL, expected 1.71 2.
We report a measurement of the inclusive charged-particle distribution for gluon jets derived from nearly threefold-symmetric three-jet events taken at center-of-mass energy 29 GeV in e+e− annihilation. The spectrum these is observed to fall off more rapidly than those quark same energy.Received 11 September 1985DOI:https://doi.org/10.1103/PhysRevLett.55.1954©1985 American Physical Society
The charged-particle multiplicities of hadronic events deriving from produced bottom or charm quarks have been measured in the Mark II detector at PEP ${e}^{+}{e}^{\ensuremath{-}}$ annihilation 29 GeV. For containing one semileptonic and weak decay, we find 15.2\ifmmode\pm\else\textpm\fi{}0.5\ifmmode\pm\else\textpm\fi{}0.7 for 13.0\ifmmode\pm\else\textpm\fi{}0.5\ifmmode\pm\else\textpm\fi{}0.8 charm. corresponding charged particles accompanying pair heavy hadrons are...