Tag Archives: Evento scientifico

PROTO-SPHERA is an innovative Magnetic Confinement plasma experiment for Controlled Thermonuclear Fusion research, whose aim is to form a Spherical Torus for confining a plasma of thermonuclear interest not around a metal centerpost (as in Tokamaks), but around a Plasma Centerpost. The PROTO-SPHERA experiment is producing plasma since 2 years and has reached in Argon discharges its Phase-1 target current of 8.5 kA in the Plasma Centerpost. In future (at 60 kA plasma current) magnetic plasma instabilities will kink the Plasma Centerpost to a point such as to shed a Spherical Torus around it. The experiment can at the moment produce the Plasma Centerpost only, but it is already exploring the initial phases of the kink instability. This confinement scheme, if successful, will have advantages over Tokamaks: cylindrical and not toroidal geometry of the vacuum vessel (easing access and repairs), undefined sustainment of the toroidal current within the Spherical Torus, by DC voltage applied to the Plasma Centerpost (allowed by mixed magnetic and electrostatic plasma confinement and plasma mass motion), spontaneous re-forming of the Torus in case of ‘plasma disruption’ and finally high plasma beta (unitary ratio between plasma pressure and magnetic confinement pressure, which in conventional Tokamaks is only a few %), that could minimize the size of a future Fusion reactor.

Jets, the observable remnants of energetic quarks and gluons, are fundamental objects in QCD. Jets in elementary collisions provide essential, precise tools for the study of the Standard Model and beyond, thanks to decades of development in both theory and experimental methods. In nuclear collisions at collider energies, jets are used to probe hot QCD matter though modification of their production rates and internal structure. However, jet measurements in the complex environment of nuclear collisions require new techniques, to suppress the huge uncorrelated background in such events without imposing bias on the measured distributions. Indeed, one of the most interesting and sensitive jet measurements in heavy-ion collisions is the secondary scattering of low energy jets in the Quark-Gluon Plasma, which is especially challenging due to very small signal/background. I will discuss new approaches to accurate, unbiased jet measurements over the full jet phase space in nuclear collisions, with application to data from the ALICE experiment at the LHC and the STAR experiment at RHIC. I will also discuss the potential application of these techniques to BSM measurements in proton-proton collisions, in the high luminosity era of the LHC.

We report results of baryon-hadron and meson-hadron correlations at intermediate pT, where an anomalous enhancement in the inclusive baryon-to-meson ratio has been observed in p-Pb collisions at VsNN = 5.02 TeV. The choice of the trigger pT region (2.0 pT 4.0 GeV/c) is of particular interest as it is believed to have contributions from both hard (fragmentation) and soft (hydrodynamics and/or coalescence model of hadronization) processes of particle production. The associated particles are charged hadrons with 1.0 pT 4.0 GeV/c. Using the two particle correlation technique, the multiplicity evolution of the pion- and proton-triggered jet-like yields has been studied to explore the underlying mechanisms of particle production in the intermediate pT (trigger pT) region.

Low intensity Focused Ultrasound (FUS) combined with microbubbles open the Blood-Brain Barrier (BBB) locally and noninvasively, allowing the passage of nanoparticles into the brain. However, since the quantity of particles that can be delivered with this technique depends on multiple parameters such as tissue properties, particle properties and acoustic parameters, so far a model fully predicting the result of a FUS induced BBB opening experiment is missing. During this seminar, a mathematical model depicting both the vascular permeability as a function of time and the diffusion process occurring in brain tissue will be introduced. This model takes into account acoustic pressure, particle size, blood pharmacokinetics and diffusion rates. It was validated by performing in vivo delivery of nanoparticles with different hydrodynamic diameters in rats. The match with the experimental data proves the feasibility of this novel method to successfully predict and plan drug distribution after a BBB opening experiment.

Descrizione dei Bandi ASI ed ESA di potenziale interesse INFN. Come partecipare ai Bandi ed accedere ai finanziamenti. Domande e discussione finale.

I will discuss a simple QCD axion model that arises from identifying Peccei-Quinn with Froggatt-Nielsen symmetries. The flavor problem of the Standard Model is addressed by a U(1) flavor symmetry, which naturally leads to an axion that solves the strong CP problem. The ratio of the axion mass and its coupling to photons is related to SM fermion masses and predicted within a small range, as a direct result of the observed fermion mass hierarchies. The same hierarchies determine the axion couplings to fermions, making the framework very predictive and experimentally testable by future axion and precision flavor experiments.

I will discuss my recent achievements in researches on dark dark matter and flavour anomalies.

One of the main problems of axion scenarios is to explain the origin of an almost exact Peccei-Quinn symmetry only broken by the QCD anomaly. In this talk I will present several models where the QCD axion arises accidentally. This can be realised in confining gauge theories where the Peccei-Quinn symmetry can emerge accidentally if the representations are chiral. In some cases these models can be understood as the deconstruction of 5-dimensional gauge theories but more general constructions are possible. Phenomenological features will be discussed.

                                                  During the Symposium the strange and non-strange mesons induced processes studies at the DAFNE collider at LNF-INFN, Italy, and at the J-PARC and RIKEN facilities in Japan will be discussed in a unitary framework. The experimental research is focused on several complementary key processes, resulting either from stopped or low-energy kaon induced reactions at the DAFNE collider, from high-energy kaons induced reactions at J-PARC to pionic atoms studied at RIKEN. Studies of kaonic atoms and pionic atoms , of the hyperon-nucleon interactions, as well as the search for deeply bound kaonic nuclear states deliver new constraints on the antikaon-nucleon/nuclei and pion-nucleon/nuclei interactions. Taking advantage of advanced detector systems, such as high precision X-ray detectors, active targets, trackers and calorimeters, and considering the opportunity to use the Italian and Japanese facilities in the coming years, we face the unique chance for resolving the ambiguities and shed new light on the structure of the neutron stars and arrive to a new understanding of the role of strangeness in the Universe. The Symposium is organized with the support of the StrangeMatter (Strangeness in the compact stars? High precision experimental and theoretical studies of the strange matter nuclear interactions at low-energies) project, financed by the Ministero degli Affari Esteri e della Cooperazione Internazionale, Direzione Generale per la Promozione del Sistema Paese.   Organizers: Catalina Curceanu, LNF-INFN (Chair) Kenta Itahashi, RIKEN (Japan) Masahiko Iwasaki, RIKEN (Japan) Fuminori Sakuma, RIKEN (Japan) Alessandro Scordo, LNF-INFN (Italy) Johann Zmeskal, SMI-Vienna (Austria)  

This seminar reviews recent theoretical developments in the study of charged lepton flavour violation. The first part illustrates the status of precise next-to-leading order quantum electrodynamics calculations for the background of charged lepton flavour-violating processes, with a focus on the muonic “rare” and “radiative” decays. Phenomenological implications of these computations and their impact on present and future experiments will be discussed. The second part describes the recent progress in the effective field theory interpretation of charged lepton-flavour violating observables in connection with different energy scales. A systematic approach is briefly presented and applications on muonic and tauonic observables are reported.