Tag Archives: Evento scientifico

L’INFN e i Laboratori Nazionali di Frascati portano avanti una intensa attività di ricerca tecnologica i cui prodotti, oltre che nella ricerca fondamentale, trovano applicazione in diversi campi di interesse sia sociale che industriale. In questo ciclo di seminari, dedicati ognuno a tecnologie e infrastrutture di interesse per un determinato settore, i LNF vogliono continuare il dialogo aperto con altri Enti, Università, Istituzioni ed Imprese in occasione dell’Open Day Imprese a Giugno 2017.   !CHAOS (Control system based on Higly Abstracted and Open Structure) è una nuova infrastruttura software dedicata al controllo di impianti, applicabile a contesti altamente diversificati. !CHAOS è stato sviluppato ai Laboratori Nazionali di Frascati dell'INFN, sulla base dell'esperienza maturata nel campo del controllo degli acceleratori di particelle, utilizzando tecnologie software di punta mutuate dal mondo delle WEB Applications, dei motori di ricerca e dei Social Media. Coordina A.Stecchi Prossimi Seminari 2018 LNF e le tecnologie per lo Spazio: Laboratori di test e calibrazione – Ottobre 2018 Le tecnologie di magneti e vuoto: infrastrutture e servizi – Dicembre 2018

Precise measurements of the branching ratios (BRs) for the flavor-changing neutral current decays K -> pi nu anti-nu can provide unique constraints on CKM unitarity and, potentially, evidence for new physics. It is important to measure both decay modes, K+ -> pi+ nu anti-nu and KL -> pi0 nu anti-nu, since different new physics models affect the rates for each channel differently. For the charged channel, the NA62 experiment at the CERN SPS is currently collecting data and expects to measure the BR to within 10% by the end of LHC Run 3. For the neutral channel, the BR has never been measured. KOTO, an experiment at J-PARC, should have enough data for the first observation of the decay by 2021. We are designing the KLEVER experiment to measure BR(KL -> pi0 nu anti nu) to ~20% using a high-energy neutral beam at the CERN SPS starting in Run 4. The boost from the high-energy beam facilitates the rejection of background channels such as KL -> pi0 pi0 by detection of the additional photons in the final state. On the other hand, the layout poses particular challenges for the design of the small-angle vetoes, which must reject photons from KL decays escaping through the beam pipe amidst an intense background from soft photons and neutrons in the beam. Background from Lambda -> n pi0 decays in the beam must also be kept under control. Findings from our design studies will be presented, with an emphasis on the challenges faced and …

The doubly-charged scalar often appears in Standard Model extensions motivated by perturbative mechanisms for neutrino mass generation. After briefly reviewing the models, I will focus on the corresponding low-energy effective field theory, the current constraints from flavour physics and the matching at the electroweak scale. The second part of the seminar will examine the status of current searches at the LHC and the discovery potential of the HighLumi LHC and of future e+e-colliders. I will show how these different bounds from low- and high-energy physics combine in a coherent picture.

If any excess is observed at the LHC, it is crucial to identify as many properties of the new states as possible in order to embed them into models, or classes of models, of new physics and possibly rule out other scenarios. In this respect, focusing on a number of selected signatures, I will discuss perspectives about the characterisation of the spin of Dark Matter and the properties of new fermions with vector-like nature.

Quantum Complex Matter Rome – Frascati National Laboratory, June, 11-15 2018 (arrival day: June 10th ; departure day: June 16th)   Chairpersons Antonio Bianconi (RICMASS), Augusto Marcelli (LNF-INFN), Tomo Uemura (Columbia University)   Scientific Advisory Committee Gabriel Aeppli, Piers Coleman, Andrea Cavalleri, Andrei Chubukov, Seamus Davis, Albert Fert, Atushi Fujimori, Philip Kim, Gabi Kotliar, Masatoshi Imada, Yoshihiro Iwasa, Alessandra Lanzara, Sadamichi Maekawa, Giancarlo Strinati, Kees van der Beek, Valerii Vinokur, Xiao Dong Xu, Qikun Xue   International QCM2018 Conference joint with QCM2018 School QCM2018 will highlight recent advances in all major fields in quantum phenomena in complex condensed matter. This is a multi-purpose meeting of activities based on the Frontiers of Condensed Matter Physics (FCMP) lecture courses and selected topics of Superstripes conferences. Invited and leading contributed papers will focus on research sub-fields of correlated electron systems (superconductivity and magnetism, Mott transition, quantum criticality, multi-band Hubbard model, Lifshitz transitions), nano science (graphene, TMDC, QHE, topological and 2-d materials, Fano resonances), spintronics (Skyrmions, itinerant electron magnetism, spin current, magnetic memory), cold atoms (Hubbard Model, Feshbach Resonances, BEC-BCS crossover) and complex systems (Nanoscale phase separation) to promote discussions and collaboration among researchers of different sub-fields. The QCM 2018 conference is integrated with QCM 2018 School with Educational Courses for students and young researchers. The lecture contents of the course will be announced later. All invited speakers and participants are kindly invited and urged to register at the web-site at earliest convenience. The topics of interest, can be found on the web site. Full-text papers …

A high brightness electron Linac is being built in the Compton Gamma Source at the ELI Nuclear Physics facility in Romania. To achieve the design luminosity, a train of 32 bunches, 16 ns spaced, with a nominal charge of 250 pC will collide with the laser beam in the interaction point. Electron beam spot size is measured with optical transition radiation (OTR) profile monitors. Furthermore, OTR angular distribution strongly depends on beam energy. Since OTR screens are typically placed in several positions along the Linac to monitor beam envelope, one may perform a distributed energy measurement along the machine. This will be useful, for instance, during the commissioning phase of the GBS in order to verify the correct functionality of the C-Band accelerating structures, due to the fact that there are OTR screens after each accelerating module. This talk deals with the studies of different optic configurations to achieve the field of view, resolution and accuracy in order to measure the energy of the beam. Several configurations of the optical detection line will be studied with simulation tools (e.g. Zemax)

Dark sectors are ubiquitous in physics beyond the Standard Model (SM), and may play a role in explaining many of the long-standing problems of the SM such as the existence of dark matter or the electroweak hierarchy problem. By definition, dark sectors are not charged under any of the known forces. Discovering their possible existence is thus challenging. I will describe how a a broad program combining particle, nuclear and atomic physics experiments can effectively probe a large region of the parameter space. I will show how the unique signatures of such physics can already be searched for with existing/planned experiments, including neutrino-proton fixed-target experiments and precision atomic measurements.

Active plasma lenses are promising technologies for the focusing of high brightness electron beams due to their radially symmetric focusing and their high field gradients (up to several kT/m). However, in a number of experimental situations, the transverse non-uniformity of the current density flowing in the lens causes beam emittance growth and increases the minimum achievable spot size. To study the physics of the capillary discharge processes employed as active plasma lenses, we developed a 2-D hydrodynamic computational model. Here, we present preliminary simulation results and we compare the computed magnetic field profile with one from literature, which has been experimentally inferred. The result of the comparison is discussed.

We present a unique way to detect the jet-medium interaction in p+Pb collisions at 5.02 TeV using 3 particle correlation (C112) observable constructed with particles from low and intermediate pT (0.5 < pT < 10 GeV/c) region. In case of small collision systems, the intrinsic momentum scale of the low energy jets is comparable to the characteristic scale of the medium and therefore have a larger probability of interaction with the medium. The short range of the 3 particle correlation is dominated by the jet like correlation and has a unique charge dependence as observed in the minimum bias p+Au collisions at the RHIC energy. The similar effect has been observed in EPOS in the lower multiplicity classes of p+Pb collisions where jet fragmentation plays the dominant role. Interestingly, the charge dependence of the C112 gets diminished in the higher multiplicity classes of p+Pb collisions where the jet-medium interplay may have significant contribution. The results from EPOS and AMPT and JEWEL will be presented for both p+Pb and Pb+Pb collisions at the LHC energies. The effectiveness of this observable as a probe to study jet-medium interaction in small collision systems will also be discussed.

Jet physics plays an essential role in understanding the nuclear structure at short distance and properties of the hot and dense QCD matter in heavy-ion collisions. The forward rapidity in experiments such as LHCb provide a window for furthering these studies in a difference regime of energy and density. In this talk, I will discuss about jet and electroweak boson studies in p+A collisions which can help to provide constraints on parton distributions in large nuclei. I will also discuss jet quenching in the forward direction and their implication on jet tomography of hot QCD matter.