O. Vázquez Doce
A5114375014- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Radioactive Decay and Measurement Techniques
- Nuclear physics research studies
- Quantum Mechanics and Applications
- Radiation Detection and Scintillator Technologies
- Dark Matter and Cosmic Phenomena
- Nuclear reactor physics and engineering
- Muon and positron interactions and applications
- High-pressure geophysics and materials
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Noncommutative and Quantum Gravity Theories
- Ionosphere and magnetosphere dynamics
- Quantum, superfluid, helium dynamics
- History and advancements in chemistry
- Biofield Effects and Biophysics
- Superconducting Materials and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Geophysics and Gravity Measurements
- Earthquake Detection and Analysis
- Statistical Methods and Bayesian Inference
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2016-2025
Technical University of Munich
2015-2024
A. Alikhanyan National Laboratory
2016-2024
Universidad Nacional Autónoma de México
2017-2024
Istituto Nazionale di Fisica Nucleare
2011-2024
Comenius University Bratislava
2023
Western Norway University of Applied Sciences
2023
Excellence Cluster Universe
2013-2022
Stefan Meyer Institute for Subatomic Physics
2010-2022
Tokyo Institute of Technology
2010-2022
The $\bar{K}N$ system at threshold is a sensitive testing ground for low energy QCD, especially the explicit chiral symmetry breaking. Therefore, we have measured $K$-series x rays of kaonic hydrogen atoms DA$\Phi$NE electron-positron collider Laboratori Nazionali di Frascati, and determined most precise values strong-interaction energy-level shift width $1s$ atomic state. As x-ray detectors, used large-area silicon drift detectors having excellent timing resolution, which were developed...
The strong interaction among hadrons has been measured in the past by scattering experiments. Although this technique extremely successful providing information about nucleon–nucleon and pion–nucleon interactions, when unstable are considered experiments become more challenging. In last few years, analysis of correlations momentum space for pairs stable pp p+Pb collisions ALICE Collaboration at LHC provided a new method to investigate hadrons. article, we review numerous results recently...
We report the measurement of K− absorption processes in Σ0p final state and first exclusive two nucleon (2NA) with KLOE detector. The 2NA process without further interactions is found to be 9% sum all other contributing processes, including on three more nucleons or followed by residual nucleons. also determine possible contribution ppK− bound state. yield ppK−/Kstop− (0.044±0.009stat−0.005+0.004syst)⋅10−2 but its statistical significance based an F-test only 1σ.
We observed a distinct peak in the Λp invariant mass spectrum of He3(K−,Λp)n, well below mK+2mp, i.e., threshold K− to be bound two protons. By selecting relatively large momentum-transfer region q=350∼650 MeV/c, one can kinematically separate from quasi-free process, K‾N→K‾N followed by non-resonant absorption spectator-nucleons K‾NN→ΛN. found that simplest fit gives us Breit–Wigner pole position at BKpp=47±3(stat.)−6+3(sys.) MeV having width ΓKpp=115±7(stat.)−20+10(sys.) MeV, and S-wave...
The goal of the DIRAC experiment at CERN (PS212) is to measure $\pi^+\pi^-$ atom lifetime with 10% precision. Such a measurement would yield precision 5% on value $S$-wave $\pi\pi$ scattering lengths combination $|a_0-a_2|$. Based part collected data we present first result lifetime, $\tau=[2.91 ^{+0.49}_{-0.62}]\times 10^{-15}$ s, and discuss major systematic errors. This corresponds $|a_0-a_2|=0.264 ^{+0.033}_{-0.020} m_{\pi}^{-1}$.
A model where a Dirac fermion is coupled to background dilaton field considered study s-wave scattering of by back ground black hole. It found that an uncomfortable situation towards information loss scenario arises when one loop correction gets involved during bosonization.
A large area silicon drift detectors (SDDs) system and its readout electronics have been developed by the SIDDHARTA-2 Collaboration, aiming to perform high-precision light kaonic atoms x-ray spectroscopy for investigation of strong interaction in low-energy QCD regime. To these measurements, a linear energy response good resolution are mandatory requirements system, be preserved along whole DAQ (analog digital) chain; such task is made even harder experimental environment particles...
Abstract The current work presents the optimization of large area silicon drift detectors developed by SIDDHARTA-2 collaboration for high precision x-ray measurements light exotic atom transitions. Two different radiation sources were employed in study: an tube, investigating energy resolution and charge collection efficiency device range 4000 eV–13 000 eV, a β − 90 Sr radioactive source measuring timing response, thus qualifying parameters inside semiconductor. study reports spectroscopic...
The DIRAC experiment at CERN has achieved a sizeable production of $\pi^+\pi^-$ atoms and significantly improved the precision on its lifetime determination. From sample 21227 atomic pairs, 4% measurement S-wave $\pi\pi$ scattering length difference $|a_0-a_2| = (.0.2533^{+0.0080}_{-0.0078}|_\mathrm{stat}.{}^{+0.0078}_{-0.0073}|_\mathrm{syst})M_{\pi^+}^{-1}$ been attained, providing an important test Chiral Perturbation Theory.
The kaonic (3)He and (4)He X-rays emitted in the [Formula: see text] transitions were measured SIDDHARTA experiment. widths of 2p states determined to be text], respectively. Both results are consistent with theoretical predictions. width is much smaller than value by experiments performed 70's 80's, while was for first time.
Pauli exclusion principle (PEP) violations induced by space-time noncommutativity, a class of universality for several models quantum gravity, are investigated the VIP-2 Lead experiment at Gran Sasso underground National Laboratory INFN. The experimental bound on noncommutative scale $\mathrm{\ensuremath{\Lambda}}$ excludes $\ensuremath{\theta}$-Poincar\'e far above Planck non anishing ``electriclike'' components ${\ensuremath{\theta}}_{\ensuremath{\mu}\ensuremath{\nu}}$, and up to...
Correlation functions of hadrons can be accessed in high-energy collisions atomic nuclei, revealing information about the underlying interaction. This work complements experimental efforts to study nucleon-deuteron $Nd$---with $N=p$ (proton) or $N=n$ (neutron)---correlations with theory evaluations using different techniques. The correlation ${C}_{nd}$ and ${C}_{pd}$ are calculated based on a scattering wave function, extending previous benchmarks for $Nd$ matrix this new observable. We use...
The spin–statistics connection, in particular the Pauli exclusion principle (PEP), plays a very important role our comprehension of matter and nature. Presently, PEP violation, possible within some theories, generates lively debate; it has given birth to few experiments looking for tiny effects. violation experiment put strong limit on probability by electrons, using method searching forbidden atomic transitions copper target. In this paper we present experiment, obtained results future...
To search for an |${\rm S} = -1$| di-baryonic state which decays to |$\Lambda p$|, the |${}^3{\rm He}(K^-,\Lambda p)n_{\rm missing}$| reaction was studied at 1.0 GeV}/c$|. Unobserved neutrons were kinematically identified from missing mass |$M_{X}$| of p)X$| in order have a large acceptance pn$| final state. The observed events, distributed widely over allowed region Dalitz plot, establish that major component comes three-nucleon absorption process. A concentration events specific neutron...
We present the analysis of K− absorption processes on He4 leading to Λπ− final states, measured with KLOE spectrometer at DAΦNE e+e− collider and extract, for first time, modulus non-resonant K−n →Λπ− direct production amplitude about 33 MeV below K‾N threshold. This also allows disentangle nuclear at-rest from in-flight capture, momenta 120 MeV. The data are interpreted help a phenomenological model, is found be |AK−n→Λπ−|=(0.334±0.018stat−0.058+0.034syst)fm.
The determination of low-energy cross sections and branching ratios the $$\hbox {K}^-$$ multi-nucleon absorption processes in $$\Lambda \hbox {p}$$ $$\Sigma ^0\hbox final states performed by AMADEUS collaboration is presented. Low momentum ( $$p_{\mathrm{K}} \simeq 127\ {MeV}/\hbox {c}$$ ) produced at {DA}\Phi {NE}$$ collider are impinged on a Carbon target within KLOE detector two three nucleon disentangled comparing experimental data to phenomenological calculations. spectra interpreted...
The VIolation of Pauli exclusion principle -2 experiment, or VIP-2 at the Laboratori Nazionali del Gran Sasso searches for X-rays from copper atomic transitions that are prohibited by principle. Candidate direct violation events come transition a 2p electron to ground state is already occupied two electrons. From first data taking campaign in 2016 we determined best upper limit [Formula: see text] probability such exists. Significant improvement control experimental systematics was also...
We have performed an exclusive measurement of the K−+He3→Λpn reaction at incident kaon momentum 1GeV/c. In Λp invariant mass spectrum, a clear peak was observed below threshold K¯+N+N, as signal kaonic nuclear bound state, K¯NN. The binding energy, decay width, and S-wave Gaussian form factor this state were to be BK=42±3(stat.)−4+3(syst.)MeV, ΓK=100±7(stat.)−9+19(syst.)MeV, QK=383±11(stat.)−1+4(syst.)MeV/c, respectively. total production cross section K¯NN, determined by its mode,...
The SIDDHARTINO experiment at the DA{\Phi}NE Collider of INFN-LNF, pilot run for SIDDHARTA-2 which aims to perform measurement kaonic deuterium transitions fundamental level, has successfully been concluded. paper reports main results this run, including optimization various components apparatus, among degrader needed maximize fraction kaons stopped inside target, through measurements helium 2p level. obtained shift and width values are {\epsilon}_2p = E_exp-E_e.m 0.2 {\pm} 2.5(stat) 2(syst)...
Violations of the Pauli Exclusion Principle (PEP), albeit small, could be motivated by physics beyond Standard Model, ranging from violation Lorentz invariance to extra space dimensions. This scenario can experimentally constrained through dedicated, state-of-the-art X-ray spectroscopy, searching for a forbidden atomic transition L shell K already occupied two electrons. The VIP-2 Experiment located at underground Gran Sasso National Laboratories INFN (Italy) tests PEP violations introducing...
Investigations of possible violations the Pauli exclusion principle represent critical tests microscopic space-time structure and properties. Space-time noncommutativity provides a class universality for several quantum gravity models. In this context VIP-2 lead experiment sets strongest bounds, searching violating atomic transitions in lead, excluding θ-Poincaré noncommutative models far above Planck scale nonvanishing θ_{μν} electriclike components, up to 6.9×10^{-2} scales if θ_{0i}=0.