Tag Archives: Evento scientifico

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 …

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.  

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.

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

                                                                     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)

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)

The quark-gluon dynamics manifests itself in a set of non-perturbative functions  describing all possible  spin-spin and spin-orbit correlations. Single and Dihadron semi-inclusive and hard exclusive production, both in current  and target fragmentation regions, provide a variety of spin and azimuthal angle dependent observables, sensitive to the dynamics of quark-gluon interactions. Studies of transverse momentum distributions of partons are currently driving the upgrades of several existing facilities, and the design and construction of new facilities worldwide. In this talk, we present an overview of the current status and some future measurements of the orbital structure of nucleons at Jefferson Lab.   Join Zoom Meeting https://infn-it.zoom.us/j/86189201616?pwd=SktRTGh1YTVNbEp3WkphV3o2S3Y4Zz09 Meeting ID: 861 8920 1616 Passcode: 554512

After defining the theoretical bases behind the properties of the nucleon form factor, we study the particular case of the Lambda baryon, obtaining for the first time crucial information concerning the ratio $G_E/G_M$, such as determinations for the phase and the presence of space-like zeros.   Join Zoom Meeting https://infn-it.zoom.us/j/2589495113?pwd=RjRVOEhGYTRqYkRuR09uME10bXA0UT09 Meeting ID: 258 949 5113 Passcode: 8GPN4j

On the centenary of the birth of Bruno Touschek, Università Sapienza, the Frascati National Laboratories of INFN and Accademia dei Lincei are organizing a three-day symposium dedicated to his scientific legacy and to the developments that originate from it. Bruno Touschek’s scientific career covered the period between WWII and the seventies of the past century. A world renowned scientist, a man of multifaced personality with interest in many fields, Touschek gave a fundamental contribution to the science of particle accelerators with the realization of the world’s first matter-antimatter collider, as well as relevant contribution to the theory of elementary particles. The Symposium will be broadcasted in streaming on the following institutional channels: Sapienza Università di Roma, December 2nd, 2021, h. 9:00 STREAMING: https://www.youtube.com/channel/UC2uO3CLR3CPcvYW9nEZXThA INFN Laboratori Nazionali di Frascati, December 3rd, 2021, h. 9:45 STREAMING: https://www.youtube.com/user/INFNLNF Accademia Nazionale dei Lincei, December 4th, 2021, h. 9:30 STREAMING:  https://www.lincei.it/live-streaming