Bollettino Settimanale Lunedì Martedi’ Mercoledi’ Giovedi’ Venerdì 25 Marzo 2013 26 Marzo 2013 27 Marzo 2013 28 Marzo 2013 29 Marzo 2013 AULA CONVERSI ORE 14.00 AULA CONVERSI ORE 16.00 SEMINARIO INFN DI FISICA SPERIMENTALE SEMINARIO GENERALE DELLE PARTICELLE ELEMENTARI Giovanni Jona Lasinio F. Renga (PSI) Medaglia Boltzmann 2013

Searching for the muon into positron & photon decay La meccanica statistica alla Sapienza: with the present and future MEG experiment alcuni momenti di una storia

Within the Standard Model (SM), in spite of neutrino Roma e' uno dei maggiori centri di ricerca oscillations, the flavor of charged leptons is conserved at in meccanica statistica. Attualmente in very good approximation, and therefore charged Lepton questo settore della fisica teorica e Flavor Violation (cLFV) is expected to be unobservable. matematica sono attive tutte e tre le On the other hand, most New Physics models predict universita' romane. Storicamente un ruolo cLFV at a level within the experimental reach, and particolare ha avuto la Sapienza e in processes like the mu to e gamma decay became a questo seminario descrivero' alcune standard probe for physics beyond the SM. The MEG ricerche a cui ho partecipato. Mettero' in experiment, at the Paul Scherrer Institute (Switzerland), evidenza influenze culturali e fattori che searches for this decay, down to a Branching Ration of a sono stati determinanti, in particolare il few $10^{-13}$, exploiting the most intense con! tinuous trasferimento di idee tra diversi settori della muon beam in the word. In this seminar, I will present the ricerca teorica. recent results from MEG, and the plan for an upgrade of the experiment, aiming at an improvement of the sensitivity by one order of magnitude within this decade.

AULA CONVERSI ORE 16.00 SEMINARIO ICRA

Lorenzo Amati (INAF - IASF Bologna)

GRB physics and cosmology with the Ep - Intensity correlation.

The correlation between the photon energy at which the nuFnu spectrum peaks (hence called "peak energy", Ep) and the isotropic-equivalent >> radiated energy (Eiso) or luminosity (Liso), is one of the most intriguing and debated observational evidences in Gamma-Ray Bursts (GRB) astrophysics. I present the updated Ep,i - Eiso (Liso) correlation and discuss its main >> implications for the physics and geometry of the GRB emission, the >> identification and origin of different sub-classes of GRBs (short/long, X-Ray Flashes, sub-energetic events) and the possible use of GRBs as >> cosmological probes. I also discuss the possible impact of selection / instrumental effects on the correlation and the future perspectives with present and next generation GRB experiments.