Tag Archives: Evento scientifico

The SuperKEKB project is a positron-electron collider built to explore new phenomena in particle physics. The physics program of the next B- factory delivering ultra high statistics is almost independent of, and/or complementary to, the high energy experiments at the LHC. The target luminosity is 8×10^35 cm^-2s^-1, which is 40 times the performance of the previous KEKB accelerator, which has been operated during 11 years until 2010. The consideration of SuperKEKB began in 2001. The strategy for the luminosity upgrade was a high-current scheme in the early stage. However,difficulties such as a bunch lengthening due to coherent synchrotron radiation and the need for a huge reinforcement of the RF system were encountered. As a result, in 2009 we have changed the strategy from the previous high-current to a novel “nano-beam” scheme. The nano-beam scheme was first proposed by P. Raimondi in Italy. Here the collision of low emittance beams under a large crossing angle allows squeezing the beta function at IP to values much smaller than the bunch length. Consequently, the 40 times higher target luminosity can be achieved with only twice the beam current of KEKB. The commissioning of SuperKEKB will start in early next year. In this seminar the latest upgrade schedule and the recent progress of the accelerator construction will be presented.

The Frascati National Laboratories organize the first edition of a workshop dedicated to the young researchers whose PHD theses have been awarded by INFN scientific committees. It is an opportunity for these young scientists to illustrate their work to their colleagues. All different INFN scientific areas will be covered. ▪ 2014 Award “Marcello Conversi” for Lines of Research I ▪ 2014 Award “Bruno Rossi” for Lines of Research II ▪ 2014 Award “Claudio Villi” for Lines of Research III ▪ 2014 Award “Sergio Fubini” for Lines of Research IV ▪ 2014 Award “Francesco Resmini” for Lines of Research V  

Abstract. I will report our recent experimental studies on pionic atoms and eta'-mesic nuclei. Pionic atoms are known to provide irreplaceable information on the pion-nucleus interaction. Our recent spectroscopy of pionic atoms in (d,3He) reactions provides very high precision information on the binding energies and widths, and thus we expect more stringent constraints to be set to the pion-nucleus interaction. In the presentation, our recent activities on an experiment for eta' mesic nuclei search at GSI/FAIR will also be discussed in the context of the mass generation mechanism of the mesons.

Cosmic strings are linear gravitational stable topological defects which may have been created as a consequence of phase transitions in the early universe. The formation of cosmic strings can have astrophysical and cosmological consequences. The geometry of the spacetime associated with an idealized cosmic string, i.e. infinitely long and straight, is locally flat except on the string. In quantum field theory, the corresponding nontrivial topology induces non-zero vacuum expectation values (VEVs) for physical observables. In this talk, we analyze the bosonic current densities induced by a magnetic flux running along an idealized cosmic string, admitting that the coordinate along the string’s axis is compactified. Additionally, we admit the presence of a magneti flux enclosed by the compactification axis. In order to develop this analysis, we calculate the complete set of normalized bosonic wave functions obeying a quasiperiodicity condition along the compactified dimension. In this context, only azimuthal and axial currents densities take place.

 Aim of the conference is to present recent results in the rigorous renormalization group approach developed for constructive QFT and statistical physics. In this context, we want to remember our friend and colleague Pierluigi Falco who gave important contributions to this field during his short life. The conference is financed by the PRIN 2010 "Teorie geometriche e analitiche dei sistemi Hamiltoniani in dimensioni finite e infinite" (P.I. Carlangelo Liverani), by the FIR 2013 "Condensed Matter in Mathematical Physics" (COND-MATH) (P.I. Michele Correggi), and by GNFM-INdAM. The conference is an activity that fits within the convention between the INFN and the Centre for Mathematics and Theoretical Physics (CMTP), University of Rome Tor Vergata.  Invited Speakers: A. Abdesselam, G. Benfatto , F. Bonetto, R. Bauerschmidt, D. Brydges, M. Correggi, A. Ferraz, J. Fröhlich, G. Gallavotti, A. Giuliani, C. Kopper, G. Jona Lasinio, V. Mastropietro, P. Mitter, M. Porta, T. Spencer, B. Scoppola Organizers: G. Benfatto, M. Lombardo, V. Mastropietro, A. Pizzo     

We show that deformation N-dimensional (Euclidean, spherical and hyperbolic) Coulomb system by the patential of rational Calogero model preserves superintegrability property of Coulomb problem. Then we find explicit expression of the Runge-Lenz vector and symmetry algebra of rational Calogero-Coulomb problem, formulated in terms of Dunkl operators. We find that they are proper deformations of their Coulomb counterparts. This observation permits to claim that most of properties of Coulomb and oscillator systems can be lifted to their Calogero-extended analogs by the proper replacement of momenta by Dunkl momenta operators. Particularly , we show that N-dimensional Calogero-Coulomb system preserves integrability property in the presence of Stark term, and construct its complete set of constants of motion. We find, that in parabolic coordinates the systems admits complete separation of variables for N=2,3 and partial ones for $N>3$. The system possesses linear Stark effect and find its explicit expression.Finally, we show, that two-center Calodjero-Coulomb problem is also integrable systems, which admits, in elliptic coordinates, the complet separation of variables for N=2,3 and partial ones for N>3.

Neutrinos are the most numerous and enigmatic particles with mass in the universe by far. They have incredibly small masses, so small that the Higgs mechanism may not be the primary source of mass for neutrinos. We do not know the absolute masses of neutrinos, nor the mass ordering of the neutrino flavors. We know only the mass differences that arise from the fact that neutrinos have been shown to oscillate between different flavors, however with remarkably different properties from quark mixing. Neutrinos play a crucial role in the structural evolution of the universe. We do not know whether there are more than 3 types of neutrinos or whether the known 3 types have non-standard interactions. We also do not know to what extent neutrinos contribute to the matter-antimatter asymmetry in the universe. Many of these questions can be addressed by a large, accelerator based neutrino experiment. A new collaboration has just been formed with over 140 institutions from around the world. DUNE (Deep Underground Neutrino Experiment) is a proposed gigantic 40 kiloton (fiducial volume) liquid argon detector to be located deep underground in the Sanford Underground Research Facility in South Dakota, with a fine-grained near detector at Fermilab.. Neutrinos are incredibly weakly interacting, and all accelerator based neutrino experiments are statistics limited. A newly upgraded accelerator complex at Fermilab is planned that can deliver 1.2 MW of beam power on target by 2025, and 2.4 MW several years later. Major platforms for R&D are being constructed at CERN and …