Search results for " libraries"
showing 10 items of 239 documents
Molecular $\Omega_c$ states generated from coupled meson-baryon channels
2018
We have investigated $\Omega_c$ states that are dynamically generated from the meson-baryon interaction. We use an extension of the local hidden gauge to obtain the interaction from the exchange of vector mesons. We show that the dominant terms come from the exchange of light vectors, where the heavy quarks are spectators. This has as a consequence that heavy quark symmetry is preserved for the dominant terms in the $(1/m_Q)$ counting, and also that the interaction in this case can be obtained from the $\textrm{SU(3)}$ chiral Lagrangians. We show that for a standard value for the cutoff regulating the loop, we obtain two states with $J^{P}={1/2}^{-}$ and two more with $J^{P}={3/2}^{-}$, thr…
Electron and muon $g-2$ anomalies in general flavour conserving two Higgs doublets models
2020
In general two Higgs doublet models (2HDMs) without scalar flavour changing neutral couplings (SFCNC) in the lepton sector, the electron, muon and tau interactions can be decoupled in a robust framework, stable under renormalization group evolution. In this framework, the breaking of lepton flavour universality (LFU) goes beyond the mass proportionality, opening the possibility to accommodate a different behaviour among charged leptons. We analyze the electron and muon $(g-2)$ anomalies in the context of these general flavour conserving models in the leptonic sector (g$\ell$FC). We consider two different models, I-g$\ell$FC and II-g$\ell$FC, in which the quark Yukawa couplings coincide, res…
Modular symmetry origin of texture zeros and quark-lepton unification
2020
The even weight modular forms of level $N$ can be arranged into the common irreducible representations of the inhomogeneous finite modular group $\Gamma_N$ and the homogeneous finite modular group $\Gamma'_N$ which is the double covering of $\Gamma_N$, and the odd weight modular forms of level $N$ transform in the new representations of $\Gamma'_N$. We find that the above structure of modular forms can naturally generate texture zeros of the fermion mass matrices if we properly assign the representations and weights of the matter fields under the modular group. We perform a comprehensive analysis for the $\Gamma'_3\cong T'$ modular symmetry. The three generations of left-handed quarks are a…
In depth analysis of the combined HERA data in the dipole models with and without saturation
2018
We present an updated impact parameter dependent saturation model (IPsat) determined trough a fit to the combined HERA I and I+II reduced cross section data. The same HERA data are used to fit the linearized (IPnonsat) version of the applied dipole amplitude, which makes it possible to estimate the magnitude of the saturation effects in various experiments. We find that both parametrizations provide comparable descriptions of the considered data when an effective confinement scale dynamics is incorporated with quark masses. Moreover, it is possible to consistently determine the light and charm quark masses. The role of potentially non-perturbatively large dipoles is examined in detail, with…
Quantum Probes for the Characterization of Nonlinear Media
2021
Active optical media leading to interaction Hamiltonians of the form H=λ˜(a+a†)ζ represent a crucial resource for quantum optical technology. In this paper, we address the characterization of those nonlinear media using quantum probes, as opposed to semiclassical ones. In particular, we investigate how squeezed probes may improve individual and joint estimation of the nonlinear coupling λ˜ and of the nonlinearity order ζ. Upon using tools from quantum estimation, we show that: (i) the two parameters are compatible, i.e., the may be jointly estimated without additional quantum noise
An on-line learning method for face association in personal photo collection
2012
Due to the widespread use of cameras, it is very common to collect thousands of personal photos. A proper organization is needed to make the collection usable and to enable an easy photo retrieval. In this paper, we present a method to organize personal photo collections based on ''who'' is in the picture. Our method consists in detecting the faces in the photo sequence and arranging them in groups corresponding to the probable identities. This problem can be conveniently modeled as a multi-target visual tracking where a set of on-line trained classifiers is used to represent the identity models. In contrast to other works where clustering methods are used, our method relies on a probabilis…
I criminalisti dello Stato della Chiesa. Famiglie, carriere e biblioteche (XVII secolo)
2023
Il volume affronta una figura chiave dell’immaginario penalistico di Antico regime, ovvero il giudice che amministra la giustizia nella stagione d’oro della criminalistica, quella, per intenderci, interpretata da un giurista del calibro, e della reputazione, di Prospero Farinacci. L’analisi si concentra, infatti, sul personale giusdicente che ha operato nei tribunali dello Stato della Chiesa nella prima metà del Seicento, tra i pontificati di Clemente VIII e Alessandro VII, in modo particolare sui giudici attivi presso le magistrature romane. L’indagine assume i tratti della ricerca prosopografica, attraverso lo spoglio di una documentazione d’archivio diffusa in diversi fondi dell’amminist…
Provenienze e possessori degli incunaboli di Agrigento: uno sguardo retrospettivo
2022
Based on the history of the Biblioteca Lucchesiana and of the Library of the Episcopal Seminary in Agrigento, an account is given on the provenance and ownership data derived from the catalogue of incunabula owned by both libraries.
Tra bisogni individuali e fruizione collettiva. Spazi delle biblioteche e pratiche di lettura in una prospettiva diacronica
2021
Over the centuries, libraries have profoundly transformed their spaces, their physical appearance, their organization, but they have always remained faithful to their dual mission: a) to support lifelong learning and individual creativity, and b) to foster community development, that is, the growth of all social groups and age groups. The evolution of libraries has seen a steady acceleration especially since the mid-19th century, when the industrial processes of book production definitely expanded the availability and accessibility of content for a largest audience. The improved socio-economic conditions were best suited to the birth and development of public libraries, acting as democratic…
“Let there be light”. Andrew Carnegie e le biblioteche pubbliche
2021
The impact of cultural patronage for local development has so far not been adequately emphasized in comparative studies on public library history. Andrew Carnegie (1835-1919), the famous entrepreneur of Scottish origins who, as a young man, emigrated to the United States (Pennsylvania), where the fortunes of his steel industry quickly made him an extremely wealthy man, can rightly be regarded as the most extraordinary patron of public libraries in the English-speaking countries between the 19th and 20th centuries. Later, mindful of the great value of free libraries for his self-training in his youth, Carnegie devoted several million dollars for the establishment of over 2,500 new public lib…