A5105413237- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Nuclear Physics and Applications
- Nuclear physics research studies
- Dark Matter and Cosmic Phenomena
- Particle accelerators and beam dynamics
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Quantum, superfluid, helium dynamics
- Cold Fusion and Nuclear Reactions
- Astrophysics and Cosmic Phenomena
- Radioactive contamination and transfer
- Radioactivity and Radon Measurements
- Radiation Dose and Imaging
- Pulsars and Gravitational Waves Research
- Nuclear and radioactivity studies
- Radiation Effects and Dosimetry
- Muon and positron interactions and applications
- Astronomical and nuclear sciences
- Black Holes and Theoretical Physics
- Computational Physics and Python Applications
- Terahertz technology and applications
Federico Santa María Technical University
2023-2024
University of Monastir
2011-2023
Universidad de Salamanca
2018
Petersburg Nuclear Physics Institute
2017
Campbell Collaboration
2016
Laboratoire de Physique Subatomique et de Cosmologie
2006-2015
Université Joseph Fourier
2006-2012
Institut National de Physique Nucléaire et de Physique des Particules
2007-2011
Centre National de la Recherche Scientifique
2007-2011
Kent State University
2008
The protons and neutrons in a nucleus can form strongly correlated nucleon pairs. Scattering experiments, where proton is knocked-out of the with high momentum transfer missing momentum, show that 12C neutron-proton pairs are nearly twenty times as prevalent proton-proton and, by inference, neutron-neutron This difference between types due to nature strong force has implications for understanding cold dense nuclear systems such neutron stars.
We present the first measurements of $\stackrel{\ensuremath{\rightarrow}}{e}p\ensuremath{\rightarrow}ep\ensuremath{\gamma}$ cross section in deeply virtual Compton scattering (DVCS) regime and valence quark region. The ${Q}^{2}$ dependence (from 1.5 to $2.3\text{ }\text{ }{\mathrm{GeV}}^{2}$) helicity-dependent indicates twist-2 dominance DVCS, proving that generalized parton distributions (GPDs) are accessible experiment at moderate ${Q}^{2}$. helicity-independent is also measured...
We investigated simultaneously the 12C(e,e'p) and 12C(e,e'pp) reactions at Q2=2 (GeV/c)2, xB=1.2, in an (e, e'p) missing-momentum range from 300 to 600 MeV/c. At these kinematics, with a missing momentum greater than Fermi of nucleons nucleus far delta excitation, short-range nucleon-nucleon correlations are predicted dominate reaction. For (9.5+/-2)% events, recoiling partner proton was observed back-to-back vector, experimental signature correlations.
We have measured the parity-violating electroweak asymmetry in elastic scattering of polarized electrons from 4He at an average angle <theta(lab)> = 5.7 degrees and a four-momentum transfer Q2 0.091 GeV2 . From these data, for first time, strange electric form factor nucleon G(E)s can be isolated. The A(PV) (6.72 +/- 0.84(stat) 0.21(syst) x 10(-6) yields value -0.038 0.042(stat) 0.010(syst), consistent with zero.
The present experiment exploits the interference between Deeply Virtual Compton Scattering (DVCS) and Bethe-Heitler processes to extract imaginary part of DVCS amplitudes on neutron deuteron from helicity-dependent D$({\vec e},e'\gamma)X$ cross section measured at $Q^2$=1.9 GeV$^2$ $x_B$=0.36. We a linear combination generalized parton distributions (GPDs) particularly sensitive $E_q$, least constrained GPD. A model dependent constraint contribution up down quarks nucleon spin is deduced.
We report the most precise measurement to date of a parity-violating asymmetry in elastic electron-proton scattering. The was carried out with beam energy 3.03 GeV and scattering angle =6 degrees, result A_PV = -1.14 +/- 0.24 (stat) 0.06 (syst) parts per million. From this we extract, at Q^2 0.099 GeV^2, strange form factor combination G_E^s + 0.080 G_M^s 0.030 0.025 0.006 0.012 (FF) where first two errors are experimental last error is due uncertainty neutron electromagnetic factor. This...
We present final results on the photon electroproduction ($\vec{e}p\rightarrow ep\gamma$) cross section in deeply virtual Compton scattering (DVCS) regime and valence quark region from Jefferson Lab experiment E00-110. Results an analysis of a subset these data were published before, but has been improved which is described here at length, together with details experimental setup. Furthermore, additional have analyzed resulting sections new kinematic settings, for total 588 bins. $Q^2$-...
We present deeply virtual ${\ensuremath{\pi}}^{0}$ electroproduction cross-section measurements at ${x}_{B}=0.36$ and three different ${Q}^{2}$ values ranging from 1.5 to $2\text{ }\text{ }{\mathrm{Ge}\mathrm{V}}^{2}$, obtained Jefferson Lab Hall A experiment E07-007. The Rosenbluth technique is used separate the longitudinal transverse responses. Results demonstrate that cross section dominated by its component and, thus, far asymptotic limit predicted perturbative quantum chromodynamics....
We report high-precision measurements of the deeply virtual Compton scattering (DVCS) cross section at high values Bjorken variable x_{B}. DVCS is sensitive to generalized parton distributions nucleon, which provide a three-dimensional description its internal constituents. Using exact analytic expression for all possible polarization states initial and final electron state photon, we present first experimental extraction four helicity-conserving form factors (CFFs) nucleon as function...
Abstract This paper presents a method employing Multi-Layer Perceptron (MLP) neural network to enhance the spatial resolution of laterally segmented electromagnetic calorimeters. The study, based on GEANT4 simulations, explores impact different MLP architectures and hyperparameters across range calorimeter block sizes incident photon energies from 1 GeV 10 GeV. Optimal configurations are identified, including number input neurons, hidden layers, neurons per layer. optimized model...
We present measurements of the ep->ep pi^0 cross section extracted at two values four-momentum transfer Q^2=1.9 GeV^2 and Q^2=2.3 Jefferson Lab Hall A. The kinematic range allows to study evolution hadronic tensor as a function Q^2 W. Results will be confronted with Regge inspired calculations GPD predictions. An intepretation our data within framework semi-inclusive deep inelastic scattering has also been attempted.
The proton is composed of quarks and gluons, bound by the most elusive mechanism strong interaction called confinement. In this work, dynamics gluons are investigated using deeply virtual Compton scattering (DVCS): produced a multi-GeV electron, highly photon scatters off which subsequently radiates high energy photon. Similarly to holography, measuring not only magnitude but also phase DVCS amplitude allows perform 3D images internal structure proton. made accessible through...
We report the first longitudinal-transverse separation of deeply virtual exclusive ${\ensuremath{\pi}}^{0}$ electroproduction cross section off neutron and coherent deuteron. The corresponding four structure functions $d{\ensuremath{\sigma}}_{L}/dt$, $d{\ensuremath{\sigma}}_{T}/dt$, $d{\ensuremath{\sigma}}_{LT}/dt$, $d{\ensuremath{\sigma}}_{TT}/dt$ are extracted as a function momentum transfer to recoil system at ${Q}^{2}=1.75\text{ }\text{ }{\mathrm{GeV}}^{2}$ ${x}_{B}=0.36$....
We propose to study the partonic structure of $^4$He by measuring Beam Spin Asymmetry (BSA) in coherent Deeply Virtual Compton Scattering (DVCS) and differential cross-section Meson Production (DVMP) $\phi$. Despite its simple structure, a light nucleus such as has density binding energy comparable that heavier nuclei. Therefore, studying nucleus, one can learn typical features atomic The combination CLAS12 ALERT detector provides unique opportunity both quark gluon dense nucleus. Coherent...
We propose precision measurements of the helicity-dependent and helicity independent cross sections for ep->epg reaction in Deeply Virtual Compton Scattering (DVCS) kinematics. DVCS scaling is obtained limits Q^2>>Lambda_{QCD}^2, x_Bj fixed, -Δ^2=-(q-q')^2<2 GeV^2, W>2 GeV, -Δ^21 GeV^2. will use our successful technique from 5.75 GeV Hall A experiment (E00-110). With polarized 6.6, 8.8, 11 beams incident on liquid hydrogen target, we detect scattered electron HRS-L...
The three-dimensional picture of quarks and gluons in the proton is set to be revealed through Deeply virtual Compton scattering while a critically important puzzle one-dimensional remains, namely, origins EMC effect. Incoherent nuclear DVCS, i.e. DVCS on nucleon inside nucleus, can reveal 3D partonic structure bound shed new light However, Fermi motion struck nucleon, off-shell effects final-state interactions (FSIs) complicate this parton level interpretation. We propose here measurement...
Abstract We report measurements of the angular distributions low momentum atmospheric muons at 38 m above sea level for zenith angles θ between -60 and 60 degrees in south-north direction. The muon detection was performed with two NaI(Tl) scintillation detectors mounted coincidence. An adjustable lead thickness placed allowed to select a minimal ranging from 0.3 0.9 GeV/c. integrated differential flux were determined by analyzing deposited energy spectra scintillators backed up Geant4...
The five-fold differential cross section for the 12C(e,e'p)11B reaction was determined over a missing momentum range of 200-400 MeV/c, in kinematics regime with Bjorken x > 1 and Q2 = 2.0 (GeV/c)2. A comparison results theoretical models previous lower data is shown. calculations agree well up to value 325 MeV/c then diverge larger momenta. extracted distorted distribution shown be consistent extends available 400 MeV/c.
We propose to measure tagged deep inelastic scattering from light nuclei (deuterium and $^4$He) by detecting the low energy nuclear spectator recoil (p, $^3$H $^3$He) in addition scattered electron. The proposed experiment will provide stringent tests leading clear differentiation between many models describing EMC effect, accessing bound nucleon virtuality through its initial momentum at point of interaction. Indeed, conventional physics explanations effect mainly based on Fermi motion...
The spatial resolution of laterally segmented electromagnetic calorimeters, built lead fluoride material, is studied on the basis Monte-Carlo simulations. Parametrization relative shower position proposed and optimized in terms energy incoming particles elementary size calorimeter blocks. A new fit algorithm method that improves at high energies (> 5 GeV), provides guidance for design optimization calorimeters.