A5003078632- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Black Holes and Theoretical Physics
- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced NMR Techniques and Applications
- Nuclear physics research studies
- Physics of Superconductivity and Magnetism
- Particle Accelerators and Free-Electron Lasers
- Quantum chaos and dynamical systems
- Cosmology and Gravitation Theories
- Particle Detector Development and Performance
- Atomic and Molecular Physics
- Computational Physics and Python Applications
- Theoretical and Computational Physics
- Neutrino Physics Research
- Nuclear Physics and Applications
- Quantum optics and atomic interactions
- Quantum, superfluid, helium dynamics
- Superconducting Materials and Applications
- Electromagnetic Scattering and Analysis
- advanced mathematical theories
- Medical Imaging Techniques and Applications
University of Coimbra
2011-2023
Instituto Politécnico de Lisboa
2017
University of Lisbon
2017
Centro de Estudos e Sistemas Avançados do Recife
2017
Materia (United States)
2017
The University of Adelaide
2016
Thomas Jefferson National Accelerator Facility
2015
Enrico Fermi Center for Study and Research
2012
University of Bologna
2012
Istituto Nazionale di Fisica Nucleare, Sezione di Bologna
2012
The very recently observed D(*)(sJ)(2317)(+) meson is described as a quasibound scalar csmacr; state in unitarized model, owing its existence to the strong 3P0 Okubo-Zweig-Iizuka-allowed coupling nearby S-wave DK threshold. By same mechanism, D(*)(0)(2100-2300) resonance predicted above Dpi These scalars are charmed cousins of light nonet f(0)(600), f(0)(980), K(*)(0)(800), and a(0)(980), reproduced by model. standard cnmacr; D0 D(s0), f(0)(1370), f(0)(1500), K(*)(0)(1430), a(0)(1450), lie...
A potential model for mesons is presented, which combines quark confinement and strong decay in a realistic approach. The multichannel Schr\"odinger formalism employed to describe system of one or more permanently closed quark-antiquark channels interaction with several two-meson channels. For the $q\overline{q}$ harmonic oscillator constant frequency taken. As meson only Okubo-Zweig-Iizuka-rule-allowed decays into two pseudoscalar vector type are considered. Final-state interactions between...
An outline is given for the description of heavy-quark-antiquark systems by means a set coupled Schr\"odinger equations in which permanently confined two-fermion channels are to free two-boson channels. Only two-particle decays satisfying Okubo-Zweig-Iizuka rule taken into account. Within this context make simple determination spectra and decay parameters possible. A comparison with data presented.
A solvable coordinate-space model is employed to study the $c\bar{c}$ component of X(3872) wave function, by coupling a confined 3 P 1 $c\bar {c}$ state almost unbound S-wave $D^{0}\overline{D}^{*0}$ channel via 0 mechanism. The two-component function calculated for different values binding energy and transition radius a, always resulting in significant component. However, long tail case small binding, strongly limits probability, which roughly lies range 7–11 %, average experimental 0.16...
We use fits to recent published CPLEAR data on neutral kaon decays $π^+π^-$ and $πeν$ constrain the CPT--violation parameters appearing in a formulation of system as an open quantum-mechanical system. The obtained upper limits are approaching range suggested by certain ideas concerning quantum gravity.
A coupled-channel model previously employed to describe the narrow Ds0*(2317) and broad D0*(2400) charmed scalar mesons is generalized so as include all ground-state pseudoscalar-pseudoscalar vector-vector two-meson channels. All parameters are chosen fixed at published values, except for overall coupling constant, which fine-tuned reproduce mass. Thus, radial excitations Ds0*(2850) D0*(2740) predicted, both with a width of about 50 MeV. The former state appears correspond new DsJ(2860)...
A multichannel calculation of excited ${J}^{PC}={1}^{--}\ensuremath{\phi}$ states is carried out within a generalization the resonance-spectrum expansion, which may shed light on classification $\ensuremath{\phi}(2170)$ resonance, discovered by BABAR and originally denoted $X(2175)$. In this framework, complete spectrum bare $s\overline{s}$ coupled to those Okubo-Zweig-Iizuka--allowed decay channels that should be most relevant for considered energy range. The included $S$- $P$-wave...
We comment on the recent observation of decay mode D(sJ)(*)(2860)-->D(*)K by BABAR Collaboration [arXiv:0908.0806], and contest their peremptory conclusion that data exclude a 0(+) assignment for D(sJ)(*)(2860). In particular, we argue observed branching fraction B(D(sJ)(*)(2860)-->D(*)K)/B(D(sJ)(*)(2860)-->DK)=1.1 pm 0.15 0.19 supports existence two largely overlapping resonances at about 2.86 GeV, namely pair radially excited tensor 2(+) scalar c-sbar states. This scenario is further...
We show that the long known puzzling branching ratios of open-charm decays in ${e}^{+}{e}^{\ensuremath{-}}$ annihilation can be reasonably described with a simple form factor, which strongly suppresses open channels far above threshold. Application to ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}J/\ensuremath{\psi}\ensuremath{\pi}\ensuremath{\pi}$ data on $X(4260)$ enhancement recently reported by BABAR Collaboration [B. Aubert (BABAR Collaboration), arXiv:0808.1543] allows good fit...
We argue that the X(4260) enhancement contains a wealth of information on 1-- cc spectroscopy. discuss shape observed in Okubo-Zweig-Iizuka-forbidden process e+e-→π+π-J/ψ, particular, at and near vector charmonium resonances as well open-charm threshold enhancements. The resulting very broad structure does not seem to classify itself resonance, but its detailed allows us identify new states with higher statistics than decay. Here, we estimate resonance parameters ψ(3D). Our approach also...
A recent quark-model description of $$X(3872)$$ as an unquenched $$2\,{}^{3\!}P_1$$ $$c\bar{c}$$ state is generalised by now including all relevant meson–meson configurations, in order to calculate the widths experimentally observed electromagnetic decays $$X(3872)\rightarrow \gamma J/\psi $$ and \psi (2S)$$ . Interestingly, inclusion additional two-meson channels, most importantly $$D^\pm D^{\star \mp }$$ , leads a sizeable increase probability total wave function, although...
This document contains a summary of the LHCb workshop on multi-body decays D and B mesons, held at CBPF, Rio de Janeiro, in July 2015. The was focused issues related to amplitude analysis three- four-body hadronic decays. In addition selected results, contributions from guest theorists are included.
The quark-level linear σ model (LσM) is revisited, in particular concerning the identification of f 0 (400–1200) (or σ(600)) scalar meson as chiral partner pion. We demonstrate predictive power LσM through ππ and πNs-wave scattering lengths, well several electromagnetic, weak, strong decays pseudoscalar vector mesons. ease with which data for these observables are reproduced lends credit to necessity include a fundamental [Formula: see text] degree freedom, be contrasted approaches like...
By comparing SU(3)-breaking scales of linear mass formulas, it is shown that the lowest vector and scalar mesons all have a $\overline{q}q$ configuration, while ground-state octet decuplet baryons are qqq. Also, quark-level $\ensuremath{\sigma}$ model employed to predict similar qqq states. Furthermore, approximate degeneracy ${a}_{0}(985)$ ${f}_{0}(980)$ demonstrated be accidental. Finally, various strong, electromagnetic, weak mesonic decay rates successfully explained within framework model.
The assignments of the isoscalar scalar mesons ${f}_{0}(980),$ ${f}_{0}(1370),$ and ${f}_{0}(1500)$ in terms their flavor substructure is still a matter heated dispute. Here we employ weak electromagnetic decays ${D}_{s}^{+}\ensuremath{\rightarrow}{f}_{0}{\ensuremath{\pi}}^{+}$ ${f}_{0}\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\gamma},$ respectively, to identify ${f}_{0}(980)$ as mostly $\overline{s}s,$ ${f}_{0}(1370)$ dominantly $\mathrm{n\ifmmode \bar{}\else \={}\fi{}}n,$...
Pole trajectories connecting light and heavy scalar mesons, both broad resonances quasibound states, are computed employing a simple coupled-channel model. Instead of varying the coupling constant as in previous work, quark meson masses continuously changed, so to have one evolve smoothly into another with different flavor(s). In particular, it is shown, among several other cases, how still controversial ${K}_{0}^{*}(800)$ turns established ${\ensuremath{\chi}}_{c0}$, via disputed...
The first part of this report reviews recent developments at the interface between lattice work on QCD with light dynamical quarks, effective field theory and low energy precision experiments. Then I discuss how dispersion can be used to analyze structure ππ scattering amplitude in a model independent manner. This leads an exact formula for mass width lowest few resonances, terms observable quantities. As application, consider pole position σ, paying particular error propagation numerical...