Tag Archives: Evento scientifico

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Various symmetries are one of the most basic concepts in modern physics. Every conservation law is related to some symmetry. However, it is known that some of the symmetries are violated in weak interactions. One of the most important nature symmetries are parity (P), time reversal (T) and charge-conjugation (C). Confirmation of breaking one of those symmetries in strong interactions would have significant impact on strong interactions theory and on our understanding of the Universe. Also, particle-antiparticle asymmetry in nature is strictly connected with T symmetry breaking which should occurred in an early time of the Universe. Up to now systematic searches of T violation have been done with use of neutral particles. For charged particles, due to special difficulties of applying electric fields on charged particles, only indirect experiments, with limited precision, have been performed. Just recently, an alternative approach has been proposed. Using storage rings to accumulate polarized particles it is possible to measure electric dipole moment (EDM) – a quantity which is strictly related to T and P symmetry. To undertake measurement of EDM of charged particles, new international collaboration JEDI has been established in 2011. JEDI (Jülich Electric Dipole moment Investigations) links together researchers from all over the world. The most important institutions involved are: Forschungszentrum Julich, RWTH Aachen, Tbilisi State University, SPSC Grenoble, University of Ferrara, Jagiellonian University, Joint Institute for Nuclear Research in Dubna, Institute for Basic Science in Daejeon. The main objective of JEDI is to build a dedicated storage ring for a …

Despite the great achievement of the discovery of the Higgs boson, the Large Hadron Collider has found no evidence of physics Beyond the Standard Model and the exclusion limits on new physics have now become pretty strong. The LNF Winter Institute 2018 will discuss the prospects to discover new physics at the present LHC run, in its high-luminosity and high-energy phases, as well as at other future colliders. In particular, we shall debate the searches for Z’ bosons, predicted by U(1) gauge groups inspired by Grand Unification Theories, taking particular care about supersymmetric and leptophobic scenarios and Dark Matter signature in models based on extended Higgs sectors, possibly CP-violating. We will also investigate the perpectives at future circular colliders from the viewpoint of Higgs and top-quark phenomenology.

The general underlying purpose of this study is a renement of understanding the mechanism of connement in quantum chromodynamics (QCD) within the approach based on the specic background vacuum gluon congurations { almost everywhere homogeneous Abelian gluon elds represented by the statistical ensemble of domain wall networks. In particular, the aim of the present study is to investigate the role of quark low-lying modes in the presence of these background elds for stabilization of a nite size of a space-time regions (domains) where the background (anti-)self-dual Abelian eld can be seen as homogeneous. This task is of principal importance for justication of the domain model of connement, chiral symmetry realization and colorless hadron formation in QCD. This estimation indicates that, based solely on the requirement of minimal energy, the quark zero modes may provide for a self- consistent mechanism of formation of the domain structured vacuum gluon congurations.The regular solution of the problem related to explicit evaluation of the energy of the Abelian (anti-self-)dual domain with nite size, that is also formulated in this work but not yet solved, can lead to the very interesting mechanism of the domain size stabilization due to the quasi-zero modes of the quark elds in the (anti-) self-dual background.

Transverse observables in colour-singlet hadro-production, like the Higgs transverse momentum in gluon fusion or the $\varphi \ast$ angle in Drell-Yan processes, provide a clean experimental and theoretical environment for precision physics at colliders. I will discuss a new method for performing the resummation of transverse observables in momentum space up to N3LL accuracy.

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. Calendario Seminari 2018 Tecnologie per i Beni culturali: infrastrutture e servizi INFN per il Trasferimento Tecnologico – 8 Febbraio 2018 THz per Applicazioni Scientifiche e Trasferimento Tecnologico – 10 Aprile 2018 !CHAOS: un nuovo framework versatile e scalabile per il controllo e l'acquisizione dati di impianti e reti di dispositivi – 18 Giugno 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

Chaired by Roberto Saban (PRESID)

We consider Extended Theories of Gravity and in particular, models containing scalar-tensor and higher-order curvature terms, as well as models derived from fundamental theories like Non-commutative Spectral Geometry. In the weak-field approximation, we take into account the geodesic and Lense-Thirring processions, deriving constraints on the free parameters by the experimental data on Solar System scales. The main result of this research is that constraints on fundamental theories of gravity can be achieved at local scales and compared with cosmic data.

Pseudoscalar QCD axions and axion-like Particles (ALPs) are an excellent candidate for Dark Matter or can act as a mediator particle for Dark Matter. A look at the allowed axion/ALP parameter space makes it clear that these might exist at low mass (below few eV), as (part of) Dark Matter. Alternatively they might exist at higher mass, above roughly the MeV scale, potentially as a Dark Matter mediator particle. In this talk I review most prominent techniques and experiments searching for Axions and ALPs and will present in more detail efforts taking place at CERN.