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Tag Archives: Evento scientifico

Spin structure of the nucleon: current status and future measurements

Harut Avagyan (Jefferson Lab) The quark-gluon dynamics manifests itself in a set of non-perturbative functions  describing all possible  spin-spin and spin-orbit correlations. Recent studies of correlated hadron pairs,  including the pairs created in target and current fragmentation region, indicate significant correlations in hadron fragmentation process. Their understanding is becoming increasingly important in the interpretation of pion electroproduction data in general, and hadronization process of quarks, in particular. Detailed studies in multi-dimensional space, of various multiplicities and different azimuthal modulations in electroproduction of hadrons as a function of transverse momentum of involved hadrons and the Q^2, will be needed to sort out all disagreements with theory predictions and improve the phenomenology of partonic distributions in 3D. In this contribution, we will present ongoing studies and some proposed future measurements with hadrons in electroproduction at large Q^2,  with current CLAS12 detector at Jefferson Lab, and discuss opportunities with JLab energy upgrade to 24 GeV.   Join Zoom Meeting https://infn-it.zoom.us/j/86363393098?pwd=eFdmUDN0aHZpNTZGanN3bGFxV1JyZz09 Meeting ID: 863 6339 3098 Passcode: 521096

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Spin structure of the nucleon: current status and future measurements

The quark-gluon dynamics manifests itself in a set of non-perturbative functions  describing all possible  spin-spin and spin-orbit correlations. Recent studies of correlated hadron pairs,  including the pairs created in target and current fragmentation region, indicate significant correlations in hadron fragmentation process. Their understanding is becoming increasingly important in the interpretation of pion electroproduction data in general, and hadronization process of quarks, in particular. Detailed studies in multi-dimensional space, of various multiplicities and different azimuthal modulations in electroproduction of hadrons as a function of transverse momentum of involved hadrons and the Q^2, will be needed to sort out all disagreements with theory predictions and improve the phenomenology of partonic distributions in 3D. In this contribution, we will present ongoing studies and some proposed future measurements with hadrons in electroproduction at large Q^2,  with current CLAS12 detector at Jefferson Lab, and discuss opportunities with JLab energy upgrade to 24 GeV.   Join Zoom Meeting https://infn-it.zoom.us/j/86363393098?pwd=eFdmUDN0aHZpNTZGanN3bGFxV1JyZz09 Meeting ID: 863 6339 3098 Passcode: 521096

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Ionic Liquids designed solvents for green chemistry application

Ionic liquids (ILs) are organic salts that exist in the liquid phase at temperatures < 100 °C and there are up to 1018 possible candidates for this group of compounds. By using different ions arrangements it is possible to design ILs to fit the requirements of a certain application which is the most important feature of ILs. Also, ILs can be designed to be non-toxic (the third generation of ILs) or with significantly reduced toxicity compared to conventional organic solvents. ILs as highly potent, designed solvents with tunable physical and chemical properties can be successfully applied in extraction processes as solvents and task-specific extractants at the same time. Since the replacement and reduction of organic solvents belong to the main postulates of green chemistry, the design and synthesis of new ILs are in a line with green chemical principles. Additionally, the extraction procedure can be optimized so that more than 95% of the extraction mixture content is water. Aqueous biphasic systems (ABSs) are one of the green extraction approaches. ABSs based on designed ILs have been investigated and applied as an effective substitute for classical liquid-liquid extraction for (1) extraction of pesticides and textile dyes as an alternative method for their removal from waste manufacture waters; (2) sample preparation before analytical quantification (selective extraction and enrichment of Cu(II) from wastewater and biological samples with task-specific ILs); (3) recover and reuse of bioactive value-added compounds from food waste as a circular economy perspective; (4) recycling of technology critical elements; (5) isolation …

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Dynamics of classical singularities in 2D symmetric potentials

Generally speaking, as a consequence of a famous Liouville’s theorem, the volume of the phase space under the Hamiltonian flow is constant. This also means that the Jacobian of the mapping determined by the Hamiltonian flow is equal to 1 and, therefore, this mapping is never singular. However, in many important physical systems one needs to consider a specific Hamiltonian flow, which is defined by specific initial conditions. It can be shown that in this way obtained the reduced mapping can be singular. As a consequence, caustics and rainbows occur, in the configuration and angular space, respectively. Importance of the study of the singular dynamics is that the family of particles along the singularities produces a strong focusing effect. It should be also stressed that the singularities represent important global characteristic of a dynamical system. In the scattering physics of photons off a rain droplet this corresponds to the well-known rainbow effect. The singularities in 2D Hamiltonian dynamical systems described by symmetric potentials will be presented. It is assumed that the initial motion is at rest i.e. that the initial values of particles in the 2D momentum space are equal to zero. Motivation for the choice of the initial condition is related, but not restricted, to the scattering theory. Moreover, dynamic of the system can be treated independently of the scattering theory. It will be shown that a rich complex behavior of the singularities occurs. Their evolution includes qualitatively change of their form, which is accompanied with their “interactions”. Main …

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Paolo Franzini and Juliet Lee-Franzini Memorial Symposium

I Laboratori Nazionali di Frascati vogliono onorare la memoria di Paolo Franzini e Juliet Lee-Franzini con una giornata dedicata ai ricordi della grande avventura di KLOE raccontati da chi vi ha direttamente partecipato, ed alla grande eredità di fisica che questa esperienza ha prodotto. The Frascati National Laboratory wants to honour the memory of Paolo Franzini and Juliet Lee-Franzini, with a workshop devoted to personal recollections of the great adventure of KLOE from those who have participated to it, and to the big physics legacy that this experience has left.  

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Adding pieces to the short-baseline neutrino puzzle: MicroBooNE Recent Results.

The appearance of electron neutrinos in a beam of predominantly muon neutrinos is the key signature of new physics searches in accelerator neutrino experiments. The MicroBooNE experiment — the longest operating Liquid Argon Time Projection Chamber (LArTPC) in a neutrino beam — hunts for missing pieces of the short-baseline neutrino puzzle by studying neutrino interactions from both the neutrino beams produced at Fermilab, the Booster Neutrino Beam (BNB) and the Neutrinos at the Main Injector (NuMI) beam. Utilizing innovations in LArTPC simulation, reconstruction, and detector physics studies, MicroBooNE has collected and analyzed the largest neutrino-argon dataset to date. This talk presents MicroBooNE’s first look into the long-standing anomalous excess of electron-like low energy events in the MiniBooNE experiment.

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Current status of the first-row CKM unitarity from semileptonic decay processes

Several significant anomalies are recently observed in the semileptonic decays of mesons, nucleon and nuclei, in particular the apparent violation of the Cabibbo-Kobayashi-Maskawa (CKM) matrix unitarity involving the matrix elements Vud and Vus. In this talk, I will briefly review the major breakthroughs from theory and experiment that lead to such observations, and the future improvements required to bring us even closer to a confirmed discovery of physics beyond the Standard Model (BSM). Join Zoom Meeting https://infn-it.zoom.us/j/89484960989?pwd=Q3QxMkUwcVJMM25zSVFrczlMMFM4QT09 Meeting ID: 894 8496 0989 Passcode: 213792

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High precision measurements of kaonic atoms

                                                                     Overview     Kaonic atoms are special tools for studying low-energy QCD and also aspects of the QED (for higher transitions). During this symposium, we will discuss theoretical cascade calculations in kaonic atoms, their impact (such as kaon mass), and experimental methods to achieve ultra-high precision measurements, aiming at future measurements of kaonic atoms at DAFNE and elsewhere. Symposium Chairs: C. Curceanu, Laboratori Nazionali di Frascati, INFN, Italy A. Scordo, Laboratori Nazionali di Frascati, INFN, Italy D. Sirghi, Laboratori Nazionali di Frascati, INFN, Italy Local Organizing Committee: F. Napolitano, INFN-LNF F. Sgaramella, INFN-LNF F. Sirghi, INFN-LNF A. Tamborrino Orsini (secretariat)

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Mini-Symposium Quantum Boundaries: Gravity-Related Collapse Models

The aim of the mini-symposium is to discuss collapse models proposed as a solution of the measurement problem in quantum mechanics. In particular, gravity-related collapse models will be discussed, together with experimental signatures, such as (but not only)  the spontaneous radiation predicted by these models. The symposium is supported by the Foundational Questions Institute, FQXi (FQXi-RFP-CPW-2008 and FQXi-MGA-2102) and by the John Templeton Foundation (QUBO project, Grant 62099) Symposium Chairs: C. Curceanu, Laboratori Nazionali di Frascati, INFN, Italy Organizing Committee: F. Napolitano, INFN-LNF K. Piscicchia, INFN-LNF/CREF A. Tamborrino Orsini (secretariat)

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