P. Faccioli
A5107656737- 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
- Atomic and Subatomic Physics Research
- Distributed and Parallel Computing Systems
- Particle Accelerators and Free-Electron Lasers
- Nuclear physics research studies
- Superconducting Materials and Applications
- Nuclear reactor physics and engineering
- Radiation Detection and Scintillator Technologies
- Atomic and Molecular Physics
- Gamma-ray bursts and supernovae
- Radiation Therapy and Dosimetry
- Cold Atom Physics and Bose-Einstein Condensates
- X-ray Spectroscopy and Fluorescence Analysis
- Big Data Technologies and Applications
- Scientific Computing and Data Management
LIP - Laboratory of Instrumentation and Experimental Particle Physics
2016-2025
A. Alikhanyan National Laboratory
2022-2024
University of Antwerp
2024
Institute of High Energy Physics
2012-2024
University of Aveiro
2020-2023
Joint Institute for Nuclear Research
2014-2023
Istituto Nazionale di Fisica Nucleare, Trento Institute for Fundamental Physics And Applications
2018-2022
University of Bologna
2001-2020
Instituto Superior de Tecnologias Avançadas
2012-2018
University of Trento
2018
The discovery by the ATLAS and CMS experiments of a new boson with mass around 125 GeV measured properties compatible those Standard-Model Higgs boson, coupled absence discoveries phenomena beyond Standard Model at TeV scale, has triggered interest in ideas for future factories. A circular e+e- collider hosted 80 to 100 km tunnel, TLEP, is among most attractive solutions proposed so far. It clean experimental environment, produces high luminosity top-quark, W Z studies, accommodates multiple...
We highlight issues which are often underestimated in the experimental analyses on quarkonium polarization: relation between parameters of angular distributions and momentum composition quarkonium, importance choice reference frame, interplay observed decay production kinematics, consequent influence acceptance comparison measurements theoretical calculations. Given puzzles raised by available results, new must provide more detailed information, such that physical conclusions can be derived...
Polarization measurements are usually considered as the most difficult challenge for QCD description of quarkonium production. In fact, global data fits determination non-perturbative parameters bound-state formation traditionally exclude polarization observables and use them a posteriori verifications predictions, with perplexing results. With change perspective, we move to centre study, advocating that they actually provide strongest fundamental indications about production mechanisms,...
This report contains the results of Workshop on CKM Unitarity Triangle, held at CERN 13-16 February 2002 to study determination matrix from available data K, D, and B physics. is a coherent document with chapters covering elements tree level decays K meson mixing global fits unitarity triangle parameters. The impact future measurements also discussed.
Measurements of the kinematic distributions $J/ψ$ mesons produced in $p-$C, $p-$Ti and $p-$W collisions at $\sqrt{s}=41.6 \mathrm{GeV}$ Feynman-$x$ region $-0.34 < x_{F} 0.14$ for transverse momentum up to $p_T = 5.4 \mathrm{GeV}/c$ are presented. The $x_F$ $p_T$ dependencies nuclear suppression parameter, $α$, also given. results based on $2.4 \cdot 10^{5}$ both $e^+ e^-$ $μ^{+}μ^{-}$ decay channels. data have been collected by HERA-B experiment HERA proton ring DESY laboratory....
The covariance properties of angular momentum eigenstates imply the existence a rotation-invariant relation among parameters difermion decay distribution inclusively observed vector mesons. This is generalization Lam-Tung identity, result specific to Drell-Yan production in perturbative QCD, here shown be equivalent dynamical condition that dilepton always produced transversely polarized with respect quantization axes belonging plane.
Significant progress in understanding quarkonium production requires improved polarization measurements, fully considering the intrinsic multidimensionality of problem. We propose a frame-invariant formalism which minimizes dependence measured result on experimental acceptance, facilitates comparison with theoretical calculations, and provides much needed control over systematic effects due to detector limitations analysis biases. This is direct generic consequence rotational invariance...
Circular dichroism (CD) is known to be an excellent tool for the determination of protein secondary structure due fingerprint signatures α and β domains. However, CD spectra are also sensitive 3D arrangement chain as a result excitonic nature additional signals aromatic residues. This double sensitivity, when extended time-resolved experiments, should allow folding monitored with high spatial resolution. To date, exploitation this very appealing idea has been limited, difficulty in relating...
We have searched for Theta+(1540) and Xi(--)(1862) pentaquark candidates in proton-induced reactions on C, Ti, W targets at midrapidity square root of s = 41.6 GeV. In 2 x 10(8) inelastic events we find no evidence narrow (sigma approximately 5 MeV) signals the Theta+ --> pK0(S) Xi(--) Xi- pi- channels; our 95% C.L. upper limits (UL) inclusive production cross section times branching fraction B dsigma/dy/(y 0) are (4-16) mub/N a mass between 1521 1555 MeV, 2.5 Xi(--). The UL yield ratio...
The COMPASS experiment recently discovered a new isovector resonance-like signal with axial-vector quantum numbers, the $a_1(1420)$, decaying to $f_0(980)\pi$. With mass too close and width smaller than ground state $a_1(1260)$, it was immediately interpreted as light exotic meson, similar $X$, $Y$, $Z$ states in hidden-charm sector. We show that fully matching experimental data is produced by decay of $a_1(1260)$ resonance into $K^\ast(\to K\pi)\bar{K}$ subsequent rescattering through...
A measurement of the ratio Rχc=(χc→J/ψ+γ)/J/ψ in pC, pTi, and pW interactions at 920 GeV/c (√s=41.6 GeV) Feynman-x range −0.35<xJ/ψF<0.15 is presented. Both μ+μ− e+e− J/ψ decay channels are observed with an overall statistics about 15 000 χc events, which by far largest available sample pA collisions. The result Rχc=0.188±0.013st+0.024−0.022sys averaged over different materials, when no polarizations considered. χc1 to χc2 production R12=Rχc1/Rχc2 measured be 1.02±0.40, leading a cross...
Magnitude and "sign" of the measured J / psi polarization crucially depends on reference frame used in data analysis: a full understanding phenomenon requires measurements reported two "orthogonal" frames, such as Collins-Soper helicity frames. Moreover, azimuthal anisotropy can be, certain significant polar one. The seemingly contradictory results by experiments E866, HERA-B, CDF be consistently described assuming that most suitable axis for measurement is along direction relative motion...
The coefficients determining the dilepton decay angular distribution of vector particles obey certain positivity constraints and a rotation-invariant identity. These relations are direct consequence covariance properties momentum eigenstates independent production mechanism. Lam-Tung relation can be derived as particular case, simply recognizing that Drell-Yan is always produced transversely polarized with respect to one or more quantization axes. continues characterized by frame-independent...
The angular distributions of the decay products in successive decays ${\ensuremath{\chi}}_{c}({\ensuremath{\chi}}_{b})\ensuremath{\rightarrow}\mathrm{J}/\ensuremath{\psi}(\ensuremath{\Upsilon})\ensuremath{\gamma}$ and $\mathrm{J}/\ensuremath{\psi}(\ensuremath{\Upsilon})\ensuremath{\rightarrow}{\ensuremath{\ell}}^{+}{\ensuremath{\ell}}^{\ensuremath{-}}$ are calculated as a function momentum composition decaying $\ensuremath{\chi}$ meson multipole structure photon radiation, using formalism...
We study the spin-exotic $J^{PC} = 1^{-+}$ amplitude in single-diffractive dissociation of 190 GeV$/c$ pions into $\pi^-\pi^-\pi^+$ using a hydrogen target and confirm $\pi_1(1600) \to \rho(770) \pi$ amplitude, which interferes with nonresonant $1^{-+}$ amplitude. demonstrate that conflicting conclusions from previous studies on these amplitudes can be attributed to different analysis models treatment dependence squared four-momentum transfer we thus reconcile their experimental findings....
A study of the angular distributions leptons from decays J/psi's produced in p-C and p-W collisions at sqrt{s}=41.6 GeV has been performed Feynman-x region -0.34 < x_F 0.14 for transverse momentum up to 5.4 GeV/c. The data were collected by HERA-B experiment HERA proton ring DESY laboratory. results, based on a clean selection 2.3 x 10^5 reconstructed both e^+ e^- mu^+ mu^- decay channels, indicate that are with longitudinal polarization. magnitude effect is maximal low p_T. For p_T >1...
Abstract The CMS detector will be upgraded for the HL-LHC to include a MIP Timing Detector (MTD). MTD consist of barrel and endcap timing layers, BTL ETL respectively, providing precision charged particles. sensors are based on LYSO:Ce scintillation crystals coupled SiPMs with TOFHIR2 ASICs front-end readout. A resolution 30–60 ps signals at rate 2.5 Mhit/s per channel is expected along lifetime. We present an overview requirements design, simulation results measurements ASICs. associated...
The production of vector mesons in deep inelastic scattering is an interesting yet scarsely explored channel to study the transverse spin structure nucleon and related phenomena. COMPASS collaboration has performed first measurement Collins Sivers asymmetries for inclusively produced $\rho^0$ mesons. analysis based on data set collected $2010$ using a $160\,\,\rm{GeV}/c$ $\mu^+$ beam impinging transversely polarized $\rm{NH}_3$ target. $\rho^{0}$ are selected from oppositely charged hadron...