Tag Archives: Evento scientifico

Year 2015 was proclaimed as the International Year of Light and Light-based Technologies (IYL 2015). Light plays a vital role in our daily lives and is an imperative cross-cutting discipline of science in the 21st century. It has revolutionized medicine, opened up international communication via the Internet, and continues to be central to linking cultural, economic and political aspects of the global society. In this contest the LNF Seminars Committee organizes a Mini-Workshop on the afternoon of May 12 in which, after a general introductory talk on the importance and motivation of this celebration, the main focus will be given to the major space applications of light,namely laser communications developed by the European Space Agency and laser tracking of special satellites used to define the center of mass of the Earth (the so-called ‘geocenter’).    

The 3rd European Lunar Symposium will take place in the Bruno Touschek Auditorium, at LNF-INFN (see map). The program will consist of the following events: May 12th: – The registration desk will open at the ELS venue at 2:30pm and close at 7pm. – Visit to the SCF_Lab space test laboratory (http://www.lnf.infn.it/esperimenti/etrusco/) from 5pm to 7pm. Since this is a restricted clean-room facility up to 3 groups of 10 people will be accepted on a first come – first served basis. Please, send an email to: els2015infn@gmail.com. NEW: Requests for visiting the SCF_Lab are now closed. – Welcome Reception with food and drinks from 7pm to 8pm. May 13th: – ELS scientific program; lunch, 2 coffee breaks (mid-morning and mid-afternoon); Social Dinner. May 14th: – ELS Scientific program; lunch, 2 coffee breaks (mid-morning and mid-afternoon). All of the above is included in the symposium fee. In addition to the Symposium, the following events will take place: – IYL-2015 Seminars on May 12th: the INFN-LNF Seminar Committee (chaired by Manuela Boscolo) is happy to invite the ELS participants to attend seminars dedicated to the celebrations of the "International Year of Light – 2015 (IYL-2015), that will take place at the ELS venue from 3pm to 5pm. The seminars will include a coffee break. Attendance to the IYL seminars and coffee break is free of charge, but will require a separate registration (see the link to the IYL-2015 Seminars in the left menu). – Space Agencies Workshops on May 15th: INFN-LNF will …

Aim of the workshop: The top-quark mass definition and determination is a major subject of debate in both theoretical and experimental communities. Different strategies to relate the measured and theoretical quantities have been envisaged. The aim of this  3-day meeting is to convene experts on this topic to stimulate an informal discussion on different aspects of the issue. We plan to have only three or four talks each day, and plenty of time to discuss  the connection between the experimentally reconstructed top mass relying on Monte Carlo generators and different theoretical mass definitions, including the most advanced strategies. Implications of the top-mass determination for physics beyond the standard model will be also covered. The general approach and format will be pedagogical, the audience ranging from top-quark physics experts to graduate students, and should favour extended discussion among participants. Confirmed Speakers:   Spyridon Argyropoulos        (DESY, Hamburg) Vincenzo Branchina            (Catania U. & INFN) Roberto Chierici                        (CNRS & IPNL, Lyon) Marina Cobal                             (Udine U. & INFN) Roberto Franceschini          (CERN, Geneva) Andrè Hoang                           (Vienna U.) Sandra Leone                     (INFN Pisa) Fabio Maltoni                     (Louvain U.) Sven-Olaf Moch                 (DESY, Hamburg) Michael Scherer                 (Heidelberg U.) Adrian Signer                     (PSI, Villigen)  

Quantum phase transitions play a key role in the understanding the phenomena of many-body systems, especially in anti-ferromagnetic magnetic plateaus. By means of variation mean-field-like treatment based on the Gibbs–Bogoliubov inequality, it is presented the frustrated magnetization plateau and thermal concurrence properties in spin-1/2 Ising–Heisenberg models on a triangulated Kagom´e lattice and a diamond chain. Using the transfer matrix method, an exact solution for the magnetization plateau and thermal entanglement of Ising-XYZ, Blume-Emery-Griffiths and Hubbard-Ising models on a diamond chain can be obtained. Partition function zeros of the spin-1/2 and spin-1 Ising-Heisenberg models on a diamond chain have been calculated using the transfer matrix method. The existence usual and triple Yang-Lee edge singularity exponents are shown.

I will present the theoretical motivations for dark photons, vector bosons arising from a new U(1) gauge symmetry that kinetically mix with the photon. Such particles appear in a number of extensions of the Standard Model and can also be motivated from a purely effective field theory perspective as they provide one of the few portals to a dark sector. Such states have also found motivation in their ability to help explain astrophysical and terrestrial anomalies, such as the discrepant anomalous magnetic moment of the muon, and may also mediate interactions to light dark matter.

The seventeenth meeting of the Radio MonteCarlo WG (http://www.lnf.infn.it/wg/sighad) will be held at LNF on Monday and Tuesday, April 20th and 21st, 2015.

Fermilab is developing an Advanced Accelerator R&D program centered at IOTA – the Integrable Optics Test Accelerator. This small and flexible ring will be used for proof-of-principle R&D of novel concepts towards future high intensity machines. Of particular interest are the nonlinear integrable optics and the space charge compensation. This talk reviews IOTA’s R&D program as supported by modeling and simulations, and presents the current status of the design and construction of the facility.

The main results, presented during the NEUTEL 2015 conference held in Venice in the week 2-6 of March 2015, will be shown and discussed in the seminar.

Nucleon-antinucleon quasi-bound states, or states coupled to these, were searched for in the days of LEAR at CERN. Nothing has been found, but broad states or states close to the threshold were not excluded. Recent indications of the existence of quasi-bound states in the N$\overline N$ system will be presented. The BES collaboration has discovered a broad enhancement close to the p$\overline p$ threshold in the S wave, isospin 0 state formed in radiative decays of J$\psi$. Another enhancement located about 50 MeV below the threshold was found in mesonic decays of J$\psi$. In terms of the Paris potential model these findings are likely to be due to the same state. Antiprotonic atomic data provide some support for this interpretation and indicate existence of another fairly narrow quasi-bound state in a P wave. Few clarifying experiments will be indicated.

The existence of nuclear states of $\bar K$ mesons and $\eta$ mesons has been expected for about thirty years. The physical interest of this field is related to a new mechanism of nuclear binding generated by excitations of the internal nucleon structure. Despite being short lived such states might offer a new and interesting nuclear spectroscopy. Despite long and extensive experimental search, the existence and properties of such states are still elusive. Some similarities and related questions of the $\eta$ and $\bar K$ cases will be shown. Possible origin of the experimental difficulties related to weak production rate and large widths of such states will be discussed. I will try to indicate usefulness of the recent AMADEUS/KLOE measurements.