M. Contalbrigo

ORCID: 0000-0002-8612-7998
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About
Contact & Profiles
Research Areas
  • Particle physics theoretical and experimental studies
  • Quantum Chromodynamics and Particle Interactions
  • High-Energy Particle Collisions Research
  • Atomic and Subatomic Physics Research
  • Nuclear physics research studies
  • Particle Detector Development and Performance
  • Dark Matter and Cosmic Phenomena
  • Radiation Detection and Scintillator Technologies
  • Advanced NMR Techniques and Applications
  • Particle Accelerators and Free-Electron Lasers
  • Nuclear Physics and Applications
  • Neutrino Physics Research
  • Superconducting Materials and Applications
  • Particle accelerators and beam dynamics
  • Astrophysics and Cosmic Phenomena
  • Atomic and Molecular Physics
  • Physics of Superconductivity and Magnetism
  • Superconductivity in MgB2 and Alloys
  • Muon and positron interactions and applications
  • Quantum, superfluid, helium dynamics
  • Pulsars and Gravitational Waves Research
  • Medical Imaging Techniques and Applications
  • Computational Physics and Python Applications
  • Magnetic confinement fusion research
  • Inorganic Fluorides and Related Compounds

Istituto Nazionale di Fisica Nucleare, Sezione di Genova
2012-2024

Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara
2015-2024

University of Ferrara
2011-2023

Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
2023

Thomas Jefferson National Accelerator Facility
2011-2022

SLAC National Accelerator Laboratory
2022

University of York
2020-2021

Istituto Nazionale di Fisica Nucleare
2003-2020

Duquesne University
2020

Istituto Nazionale di Fisica Nucleare, Laboratori Acceleratori e Superconduttività Applicata
2019

10.1016/j.nuclphysa.2022.122447 article EN Nuclear Physics A 2022-08-08

Single-spin asymmetries for semi-inclusive electroproduction of charged pions in deep-inelastic scattering positrons are measured the first time with transverse target polarization. The asymmetry depends on azimuthal angles both pion ($\ensuremath{\phi}$) and spin axis (${\ensuremath{\phi}}_{S}$) about virtual-photon direction relative to lepton plane. extracted Fourier component $\mathbf{⟨}\mathrm{sin}(\ensuremath{\phi}+{\ensuremath{\phi}}_{S}){\mathbf{⟩}}_{UT}^{\ensuremath{\pi}}$ is a...

10.1103/physrevlett.94.012002 article EN Physical Review Letters 2005-01-06

Precise measurements of the spin structure functions proton ${g}_{1}^{p}(x,{Q}^{2})$ and deuteron ${g}_{1}^{d}(x,{Q}^{2})$ are presented over kinematic range $0.0041\ensuremath{\le}x\ensuremath{\le}0.9$ $0.18\text{ }\text{ }{\mathrm{GeV}}^{2}\ensuremath{\le}{Q}^{2}\ensuremath{\le}20\text{ }{\mathrm{GeV}}^{2}$. The data were collected at HERMES experiment DESY, in deep-inelastic scattering 27.6 GeV longitudinally polarized positrons off hydrogen deuterium gas targets internal to HERA storage...

10.1103/physrevd.75.012007 article EN Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology 2007-01-16

Azimuthal single-spin asymmetries of lepto-produced pions and charged kaons were measured on a transversely polarized hydrogen target. Evidence for naive-T-odd, transverse-momentum-dependent parton distribution function is deduced from non-vanishing Sivers effects pi+, pi0, K+, K-, as well in the difference pi+ pi- cross sections.

10.1103/physrevlett.103.152002 article EN Physical Review Letters 2009-10-09

Polarized deep-inelastic scattering data on longitudinally polarized hydrogen and deuterium targets have been used to determine double-spin asymmetries of cross sections. Inclusive semi-inclusive for the production positive negative pions from were obtained in a reanalysis previously published data. kaons measured target. The separate helicity densities up down quarks anti-up, anti-down, strange sea computed these “leading order” QCD analysis. polarization up-quark is that down-quark...

10.1103/physrevd.71.012003 article EN Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology 2005-01-01

We have studied the muon neutrino and antineutrino quasi-elastic (QEL) scattering reactions (ν μ n→μ − p $\bar{\nu }_{\mu}p\to\mu^{+}n$ ) using a set of experimental data collected by NOMAD Collaboration. performed measurements cross-section these processes on nuclear target (mainly carbon) normalizing it to total ν ( $\bar{\nu}_{\mu}$ charged-current cross section. The results for flux-averaged QEL sections in (anti)neutrino energy interval 3–100 GeV are $\langle...

10.1140/epjc/s10052-009-1113-0 article EN cc-by-nc The European Physical Journal C 2009-08-20

We present the results of a search for νμ→νe oscillations in NOMAD experiment at CERN. The looked appearance νe predominantly νμ wide-band neutrino beam CERN SPS. No evidence was found. 90% confidence limits obtained are Δm2<0.4 eV2 maximal mixing and sin2(2θ)<1.4×10−3 large Δm2. This result excludes LSND allowed region oscillation parameters with Δm2≳10 eV2.

10.1016/j.physletb.2003.07.029 article EN cc-by Physics Letters B 2003-08-12

Single-spin asymmetries for pions and charged kaons are measured in semi-inclusive deep-inelastic scattering of positrons electrons off a transversely nuclear-polarized hydrogen target. The dependence the cross section on azimuthal angles target polarization (phi_S)and produced hadron (phi) is found to have substantial sin(phi+phi_S) modulation production pi+, pi- K+. This Fourier component can be interpreted terms non-zero transversity distribution functions favored disfavored Collins...

10.1016/j.physletb.2010.08.012 article EN cc-by Physics Letters B 2010-08-12

Multiplicities in semi-inclusive deep-inelastic scattering are presented for each charge state of ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$ and ${\mathrm{K}}^{\ifmmode\pm\else\textpm\fi{}}$ mesons. The data were collected by the HERMES experiment at HERA storage ring using 27.6 GeV electron positron beams incident on a hydrogen or deuterium gas target. results as function kinematic quantities ${x}_{\mathrm{B}}$, ${Q}^{2}$, $z$, ${P}_{h\ensuremath{\perp}}$. They represent unique set...

10.1103/physrevd.87.074029 article EN publisher-specific-oa Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology 2013-04-23

The transition helicity amplitudes from the proton ground state to $P_{11}(1440)$ and $D_{13}(1520)$ excited states ($\gamma_{v}pN^*$ electrocouplings) were determined analysis of nine independent one-fold differential $\pi^{+} \pi^{-} p$ electroproduction cross sections off a target, taken with CLAS at photon virtualities 0.25\enskip {\rm GeV$^{2}$} $<$ $Q^{2}$ 0.60 \enskip GeV$^{2}$}. phenomenological reaction model was employed for separation resonant non-resonant contributions final...

10.1103/physrevc.86.035203 article EN publisher-specific-oa Physical Review C 2012-09-13

We measured the triple coincidence A(e,e'np) and A(e,e'pp) reactions on carbon, aluminum, iron, lead targets at Q2 > 1.5 (GeV/c)2, xB 1.1 missing momentum 400 MeV/c. This was first direct measurement of both proton-proton (pp) neutron-proton (np) short-range correlated (SRC) pair knockout from heavy asymmetric nuclei. For all nuclei, average to reduced cross-section ratio is about 6%, in agreement with previous indirect measurements. Correcting for Single-Charge Exchange effects decreased...

10.1103/physrevlett.122.172502 article EN publisher-specific-oa Physical Review Letters 2019-05-03

Unpolarized and beam-polarized fourfold cross sections (d^{4}σ/dQ^{2}dx_{B}dtdϕ) for the ep→e^{'}p^{'}γ reaction were measured using CLAS detector 5.75-GeV polarized electron beam of Jefferson Lab accelerator, 110 (Q^{2},x_{B},t) bins over widest phase space ever explored in valence-quark region. Several models generalized parton distributions (GPDs) describe data well at most our kinematics. This increases confidence that we understand GPD H, expected to be dominant contributor these...

10.1103/physrevlett.115.212003 article EN publisher-specific-oa Physical Review Letters 2015-11-17

There is a significant discrepancy between the values of proton electric form factor, G(E)(p), extracted using unpolarized and polarized electron scattering. Calculations predict that small two-photon exchange (TPE) contributions can significantly affect extraction G(E)(p) from electron-proton cross sections. We determined TPE contribution by measuring ratio positron-proton to elastic scattering sections simultaneous, tertiary electron-positron beam incident on liquid hydrogen target...

10.1103/physrevlett.114.062003 article EN publisher-specific-oa Physical Review Letters 2015-02-10

The OLYMPUS Collaboration reports on a precision measurement of the positron-proton to electron-proton elastic cross section ratio, R_{2γ}, direct measure contribution hard two-photon exchange section. In measurement, 2.01 GeV electron and positron beams were directed through hydrogen gas target internal DORIS storage ring at DESY. A toroidal magnetic spectrometer instrumented with drift chambers time-of-flight scintillators detected elastically scattered leptons in coincidence recoiling...

10.1103/physrevlett.118.092501 article EN publisher-specific-oa Physical Review Letters 2017-03-03

10.1140/epja/s10050-024-01282-x article EN The European Physical Journal A 2024-09-04

The momentum and helicity density distributions of the strange quark sea in nucleon are obtained leading order from charged-kaon production deep-inelastic scattering on deuteron. extracted spin-averaged K+/- multiplicities, inclusive double-spin asymmetries for polarized positrons by a deuterium target. shape distribution is softer than that average ubar dbar quarks. In region measurement 0.02 &lt; x 0.6 Q^2 &gt; 1.0 GeV^2, zero within experimental uncertainties.

10.1016/j.physletb.2008.07.090 article EN cc-by Physics Letters B 2008-08-06
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