A5009917013- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Advanced Radiotherapy Techniques
- High-Energy Particle Collisions Research
- Radiation Therapy and Dosimetry
- Radiation Dose and Imaging
- Cold Atom Physics and Bose-Einstein Condensates
- Medical Imaging Techniques and Applications
- Advanced X-ray and CT Imaging
- Black Holes and Theoretical Physics
- Physics of Superconductivity and Magnetism
- Nuclear physics research studies
- Atomic and Subatomic Physics Research
- Photoacoustic and Ultrasonic Imaging
- Nonmelanoma Skin Cancer Studies
- Prostate Cancer Diagnosis and Treatment
- Cutaneous Melanoma Detection and Management
- Radiation Effects and Dosimetry
- Radiomics and Machine Learning in Medical Imaging
- Radiation Detection and Scintillator Technologies
- Skin Protection and Aging
- Ocular Oncology and Treatments
- Nuclear Physics and Applications
- Advanced Optical Sensing Technologies
- Ultrasound and Hyperthermia Applications
Universitat de València
2016-2025
Instituto de Física Corpuscular
2015-2025
Instituto de Investigación Sanitaria La Fe
2017-2025
Universidad de Salamanca
2003-2022
Universidade Estadual Paulista (Unesp)
2022
Université Claude Bernard Lyon 1
2021
Centre National de la Recherche Scientifique
2021
Institut de Physique des 2 Infinis de Lyon
2021
Institut National de Physique Nucléaire et de Physique des Particules
2021
Parc Científic de la Universitat de València
2020
The $q\bar q$ spectrum is studied in a generalized constituent quark model constrained the study of $NN$ phenomenology and baryon spectrum. An overall good fit to available experimental data obtained. A detailed analysis all sectors from light-pseudoscalar vector mesons bottomonium performed paying special attention existence nature some non well-established states. These results should serve as complementary tool distinguishing conventional glueballs, hybrids or multiquark
Multiquark states have been advocated to explain recent experimental data in the heavy-light sector, and there are already speculations about multiquarks containing only heavy quarks antiquarks. With a rigorous treatment of four-body problem current quark models, full-charm $(cc\overline{c}\overline{c})$ full-beauty $(bb\overline{b}\overline{b})$ tetraquarks found be unbound. Thus their stability should rely on more subtle effects that not included simple picture constituent quarks. The case...
We discuss the adequate treatment of three- and four-body dynamics for quark model picture double-charm baryons tetraquarks. stress that variational Born-Oppenheimer approximations give energies very close to exact ones, while diquark approximation might be somewhat misleading. The Hall-Post inequalities also provide useful lower bounds exclude possibility stable tetraquarks some mass ratios color wave functions.
We present a generalization of the hyperspherical harmonic formalism to study systems made quarks and antiquarks same flavor. This is based on symmetrization $N$-body wave function with respect symmetric group using Barnea Novoselsky algorithm. The applied four-quark by means constituent quark model successful in description two- three-quark systems. results are compared those obtained variational approaches. Our analysis shows that exotic ${0}^{+\ensuremath{-}}$ nonexotic ${2}^{++}$ quantum...
We present an exact calculation of $S$ and $P$ wave $QQ\overline{n}\overline{n}$ states using different standard nonrelativistic quark-quark potentials. explore in detail the charm bottom sectors looking for bound that could be measured within existing facilities. Against proliferation four-quark sometimes predicted literature, we found a small number candidates to stable. analyze their properties trial distinguish between compact molecular states. Possible decay modes are discussed.
We investigate the structure of heavy baryons containing a charm or bottom quark.We employ constituent quark model successful in description baryon-baryon interaction which is consistent with light baryon spectra.We solve exactly three-quark problem by means Faddeev method momentum space.Heavy spectrum shows manifest compromise between perturbative and nonperturbative contributions.The flavor dependence one-gluon exchange analyzed.We assign quantum numbers to some already observed resonances...
Purpose: In order to facilitate a smooth transition for brachytherapy dose calculations from the American Association of Physicists in Medicine (AAPM) Task Group No. 43 (TG-43) formalism model-based calculation algorithms (MBDCAs), treatment planning systems (TPSs) using MBDCA require set well-defined test case plans characterized by Monte Carlo (MC) methods. This also permits direct comparison TG-43 reference data. Such should be made available use software commissioning process performed...
We present the first full-fledged study of flavor-exotic isoscalar $T_{bb}^-\equiv b \bar u d$ tetraquark with spin and parity $J^P=1^+$. report accurate solutions four-body problem in a quark model, characterizing structure state as function ratio $M_Q/m_q$ heavy to light masses. For such standard constituent $T_{bb}^-$ lies approximately 150 MeV below strong decay threshold $B^-\bar {B^*}^{0}$ 105 electromagnetic $B^- B^0 \gamma$. evaluate lifetime $T_{bb}^-$, identifying promising modes...
A simple string model inspired by the strong-coupling regime of quantum chromodynamics is used as a potential for studying spectrum multiquark systems with two quarks and antiquarks, careful treatment four-body problem. It found that ground state stable, lying below threshold dissociation into isolated mesons.
Purpose: Recently, the manufacturer of HDR mHDR‐v2 brachytherapy source reported small design changes (referred to herein as mHDR‐v2r) that are within manufacturing tolerances but may alter existing dosimetric data for this source. This study aimed (1) check whether these affect published source; (2) obtain new in close proximity source, including contributions from electrons and considering absence electronic equilibrium; (3) scatter dose components collapsed cone treatment planning system...
We present an exact method to study four-quark systems based on the hyperspherical harmonics formalism. apply it several physical of interest containing two heavy and light quarks using different quark-quark potentials. Our conclusions mark boundaries for possible existence compact, nonmolecular, bound states. While $QQ\overline{n}\overline{n}$ states may be stable in nature, stability $Q\overline{Q}n\overline{n}$ would imply quark correlations not taken into account by simple dynamical models.
The IAEA is currently coordinating a multi-year project to update the TRS-398 Code of Practice for dosimetry external beam radiotherapy based on standards absorbed dose water. One major aspect determination new quality correction factors, k Q , megavoltage photon beams consistent with developments in and technology since publication 2000. Specifically, all values must be on, or with, key data ICRU Report 90. Data sets obtained from Monte Carlo (MC) calculations by advanced users measurements...
The introduction of model-based dose calculation algorithms (MBDCAs) in brachytherapy provides an opportunity for a more accurate and opens the possibility novel, innovative treatment modalities. joint AAPM, ESTRO, ABG Task Group 186 (TG-186) report provided guidance to early adopters. However, commissioning aspect these was described only general terms with no quantitative goals. This report, from Working on Model-Based Dose Calculation Algorithms Brachytherapy, introduced field-tested...
Abstract Background Low‐energy x‐ray beams used in electronic brachytherapy (eBT) present significant dosimetric challenges due to their high depth‐dose gradients, the dependence of detector response on materials, and lack standardized dose‐to‐water references. These have driven need for Monte Carlo (MC) simulations ensure accurate dosimetry. However, discrepancies physics models by different MC systems raised concerns about consistency, particularly modeling bremsstrahlung interactions....
We study the mass spectrum of baryons with two and three charmed quarks. For double charm spin splitting is found to be smaller than standard quark-model potential predictions. This not influenced either by particular form confining or regularization taken for contact term spin-spin potential. consistently predict spectra triply baryons.
Despite the apparent simplicity of meson spectroscopy, light scalar mesons cannot be accommodated in usual $q\overline{q}$ structure. We study description below 2 GeV terms mixing a chiral nonet tetraquarks with conventional states. A strong diquark-antidiquark component is found for several The consideration glueball as dictated by quenched lattice QCD drives coherent picture isoscalar mesons.
We present a systematic and self-consistent analysis of four-quark charmonium states applied it to study compact systems meson-meson molecules. Our results are robust should serve clarify the situation spectroscopy above threshold production charmed mesons.
Purpose A joint working group was created by the American Association of Physicists in Medicine (AAPM), European Society for Radiotherapy and Oncology (ESTRO), Australasian Brachytherapy Group (ABG) with charge, among others, to develop a set well‐defined test case plans perform calculations comparisons model‐based dose calculation algorithms (MBDCAs). Its main goal is facilitate smooth transition from AAPM Task No. 43 (TG‐43) formalism, widely being used clinical practice brachytherapy, one...
We carry out a systematic study of exotic $QQ^\prime \bar q\bar q$ four-quark states containing distinguishable heavy flavors, $b$ and $c$. Different generic constituent models are explored in an attempt to extract general conclusions. The results robust, predicting the same sets quantum numbers as best candidates lodge bound independently model used, isoscalar $J^P=0^+$ $J^P=1^+$ states. first state would be strong electromagnetic-interaction stable while second decay electromagnetically...
We investigate the structure of SU(3) octet and decuplet baryons employing a constituent quark model designed for study baryon-baryon interaction successfully applied to meson spectra. The considers through interacting potential perturbative, one-gluon exchange, non-perturbative, boson exchanges confinement, aspects underlying theory, QCD. solve three-quark problem by means Faddeev method in momentum space. analyze effect different terms make contact with use relativistic kinematics. find an...
We present a theoretical framework that accounts for the new ${D}_{J}$ and ${D}_{sJ}$ mesons measured in open-charm sector. These resonances are properly described if considered as mixture of conventional $P$-wave quark-antiquark states four-quark components. The narrowest basically mesons, while dominantly shifted above corresponding two-meson threshold, being broad resonances. study electromagnetic decay widths basic tools to scrutiny their nature. proposed explanation incorporates natural...
We use the $\ensuremath{\rho}\ensuremath{\Delta}$ interaction in hidden gauge formalism to dynamically generate ${N}^{*}$ and ${\ensuremath{\Delta}}^{*}$ resonances. show, through a comparison of results from this analysis quark model study with data, that ${\ensuremath{\Delta}}_{5/{2}^{\ensuremath{-}}}(1930)$, ${\ensuremath{\Delta}}_{3/{2}^{\ensuremath{-}}}(1940)$, ${\ensuremath{\Delta}}_{1/{2}^{\ensuremath{-}}}(1900)$ resonances can be assigned bound states. More precisely...
Purpose: In skin high‐dose‐rate (HDR) brachytherapy, sources are located outside, in contact with, or implanted at some depth below the surface. Most treatment planning systems use TG‐43 formalism, which is based on single‐source dose superposition within an infinite water medium without accounting for true geometry conditions scattered radiation altered by presence of air. The purpose this study to evaluate dosimetric limitations formalism HDR brachytherapy and potential clinical impact....