Lepton-jets at LHC: theory and experimental results from ATLAS.

by L. Hooft van Huysduynen (New York University), T. Volanski (Tel Aviv University)

Friday 8 Mar 2013, 16:00 → 18:00 Europe/Rome

Aula Conversi (Dipartimento di Fisica)

It is conceivable that additional forces exist in nature. Such forces are likely to be weakly coupled to the visible sector and yet may have spectacular signatures at colliders. Theories of this kind have received significant theoretical and experimental attention in recent years, focusing, in part, on the possibility of a massive hidden photon which can decay to lepton pairs. In addition to their rich phenomenology, these models can explain several anomalies, such as the cosmic-ray positron flux measured by PAMELA and Fermi. At the LHC, hidden photons, once produce, show up as collimated leptons, known as lepton jets. In the first seminar the theoretical and phenomenological aspects of these ideas will be reviewed. In the second seminar the results will be presented from the prompt lepton jets search in proton-proton collisions at 7 TeV with the ATLAS experiment at LHC.