A. Silva

ORCID: 0000-0003-0197-9321
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About
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Research Areas
  • Quantum Chromodynamics and Particle Interactions
  • Particle physics theoretical and experimental studies
  • High-Energy Particle Collisions Research
  • Black Holes and Theoretical Physics
  • Nuclear physics research studies
  • History and Developments in Astronomy
  • Quantum, superfluid, helium dynamics
  • Superconducting Materials and Applications
  • Physics of Superconductivity and Magnetism
  • Tactile and Sensory Interactions
  • Multisensory perception and integration
  • Business and Management Studies
  • Particle Accelerators and Free-Electron Lasers
  • International Science and Diplomacy
  • Pulsars and Gravitational Waves Research
  • Olfactory and Sensory Function Studies
  • Advanced NMR Techniques and Applications
  • Dark Matter and Cosmic Phenomena
  • Renal and Vascular Pathologies
  • demographic modeling and climate adaptation

Universidade do Porto
2006-2017

University of Coimbra
2000-2014

Inha University
2011

Johannes Gutenberg University Mainz
2009-2011

Ruhr University Bochum
2000-2004

The nucleon form factors of the energy-momentum tensor are studied in large-Nc limit framework chiral quark-soliton model.2 MoreReceived 27 February 2007DOI:https://doi.org/10.1103/PhysRevD.75.094021©2007 American Physical Society

10.1103/physrevd.75.094021 article EN Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology 2007-05-29

We review the holographic QCD model for nucleons and vector mesons proposed in [1]. The can be thought of a consistent embedding soft wall models Einstein-dilaton gravity it leads to hadronic correlators compatible with large $N_c$ limit. compare our results masses decay constants against previous available experimental data.

10.22323/1.465.0019 article EN cc-by-nc-nd 2025-02-07

The nucleon form factors of the energy-momentum tensor are studied in large-${N}_{c}$ limit framework chiral quark-soliton model for parameters that simulate physical situations which pions heavy. This allows a direct comparison to lattice quantum chromodynamics results.

10.1103/physrevc.75.055207 article EN Physical Review C 2007-05-23

We investigate the tensor form factors of baryon octet within framework chiral quark-soliton model, emphasizing those nucleon, taking linear 1/N_c rotational as well m_s corrections into account, and applying symmetry-conserving quantization. explicitly calculate H_{T}^{q}(Q^{2}) corresponding to generalized parton distributions H_{T}(x,\xi,t). The are obtained for momentum transfer up Q^{2}\leq1\,\mathrm{GeV}^{2} at a renormalization scale 0.36\,\mathrm{GeV}^{2}. find charges \delta u=1.08,...

10.1103/physrevd.82.034022 article EN Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology 2010-08-17

We examine the electromagnetic properties of $\ensuremath{\Delta}(1232)$ resonance within self-consistent chiral quark-soliton model. In particular, we present $\ensuremath{\Delta}$ form factors vector-current ${G}_{E0}({Q}^{2})$, ${G}_{E2}({Q}^{2})$, and ${G}_{M1}({Q}^{2})$ for a momentum-transfer range $0\ensuremath{\le}{Q}^{2}\ensuremath{\le}1\text{ }\text{ }{\mathrm{GeV}}^{2}$. apply symmetry-conserving quantization soliton take $1/{N}_{c}$ rotational corrections into account. Values...

10.1103/physrevd.79.094025 article EN Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology 2009-05-22

The strange properties of the nucleon are investigated within framework SU(3) chiral quark-soliton model assuming isospin symmetry and applying symmetry-conserving quantization. We present form factors ${G}_{E,M}^{0}{(Q}^{2}{),G}_{M}^{Z}{(Q}^{2})$ electric magnetic ${G}_{E,M}^{\mathrm{s}}{(Q}^{2})$ incorporating pion kaon asymptotics. results show a fairly good agreement with recent experimental data from SAMPLE HAPPEX collaborations. also predictions for future measurements including A4...

10.1103/physrevd.65.014016 article EN Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 2001-12-12

We investigate three different axial-vector form factors of the nucleon, ${G}_{A}^{0}$, ${G}_{A}^{3}$, ${G}_{A}^{8}$, within framework SU(3) chiral quark-soliton model, emphasizing their strangeness content. take into account rotational $1/{N}_{c}$ and linear strange quark (${m}_{s}$) contributions using symmetry-conserving quantization assuming isospin symmetry. The factor is also obtained they all are discussed in context parity-violating scattering polarized electrons off nucleon its...

10.1103/physrevd.72.094011 article EN Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology 2005-11-14

We investigate the form factors of chiral-odd nucleon matrix element tensor current. In particular, we aim at anomalous magnetic within framework SU(3) and SU(2) chiral quark-soliton model. consider $1/N_c$ rotational corrections linear effects symmetry breaking with symmetry-conserving quantization employed. first obtain results moments for up down quarks: $\kappa_{T}^{u}=3.56$ $\kappa_{T}^{d}=1.83$, respectively. The strange moment is yielded to be $\kappa_{T}^{s}=0.2\sim -0.2$, that...

10.1103/physrevd.82.054014 article EN Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology 2010-09-13

We investigate the semileptonic hyperon decays within framework of self-consistent SU(3) chiral quark-soliton model ($\chi$QSM). take linear $1/N_c$ rotational as well $m_s$ corrections into account and apply symmetry conserving quantization. present results for form factors $f_1(Q^2)$, $f_2(Q^2)$ $g_1(Q^2)$ in addition to decay constants hyperons. also have calculated radii dipole masses these all relevant strangeness-conserving strangeness-changing transitions.

10.1088/1126-6708/2008/07/132 article EN other-oa Journal of High Energy Physics 2008-07-30

We investigate parity-violating electroweak asymmetries in the elastic scattering of polarized electrons off protons within framework chiral quark-soliton model ($\ensuremath{\chi}\mathrm{QSM}$). use as input former results electromagnetic and strange form factors newly calculated SU(3) axial-vector factors, all evaluated with same set four parameters adjusted several years ago to general mesonic baryonic properties. Based on this scheme, which yields positive electric magnetic...

10.1103/physrevd.74.054011 article EN Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology 2006-09-08

We investigate the flavor decomposition of electromagnetic form factors nucleon, based on chiral quark–soliton model (⁠|$\chi$|QSM) with symmetry-conserving quantization. consider rotational |$1/N_c$| and linear strange-quark mass (⁠|$m_{\mathrm{s}}$|⁠) corrections. discuss results flavor-decomposed in comparison recent experimental data. In order to see effects strange quark, we compare SU(3) those SU(2). Finally, transverse charge densities for both unpolarized polarized nucleons. The...

10.1093/ptep/ptx190 article EN cc-by Progress of Theoretical and Experimental Physics 2017-12-26

Pair-production and single-production of W bosons provide many opportunities to look for new physics via precision measurements, instance scrutinising the involved triple-gauge vertices or by measuring CKM matrix elements in an environment very complementary B hadron decays. This contribution presents ongoing work based on full simulation ILD concept, exploiting O(10 8 ) produced during 250 GeV stage ILC, as well CLD concept proposed FCC-ee. The projections, which also contribute two focus...

10.1051/epjconf/202431501016 article EN cc-by EPJ Web of Conferences 2024-01-01

Haptic devices are normally used to enrich the user interface of a controlled system with an extra sensing feedback. These especially important in education, engineering, medical training and industry, or every situation where direct contact is not possible due distance, risk infection, explosion, etc. This paper introduces novel approach - thermal haptic device for brain stimulation -, be cases potential dementia, coma patients, others that may benefit from other type stimulus. The based on...

10.1109/expat.2013.6703025 article EN 2013-09-01

Pair-production and single-production of $W$ bosons provide many opportunities to look for new physics via precision measurements, instance scrutinising the involved triple-gauge vertices or by measuring CKM matrix elements in an environment very complementary $B$ hadron decays. This contribution presents ongoing work based on full simulation ILD concept, exploiting O($10^8$) produced during $250$\,GeV stage ILC, as well CLD concept proposed FCC-ee. The projections, which also contribute two...

10.48550/arxiv.2410.15122 preprint EN arXiv (Cornell University) 2024-10-19

10.1016/j.nuclphysa.2005.03.030 article EN Nuclear Physics A 2005-05-29

We investigate the electric form factors and charge radii of pentaquark baryons within framework chiral quark-soliton model. consider rotational $1/{N}_{c}$ linear ${m}_{s}$ corrections, assuming isospin symmetry employing symmetry-conserving quantization. The flavor-decomposed densities ${\ensuremath{\Theta}}^{+}$ are presented. charged turn out to be very similar those corresponding octet baryons. neutral obtained tiny positive. strange factor proton is shown larger than one by around 20%....

10.1103/physrevd.74.054005 article EN Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology 2006-09-07

10.7566/jpscp.1.013039 article EN Proceedings of the 12th Asia Pacific Physics Conference (APPC12) 2014-03-19
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