Raffaella De Vita

Meson Spectroscopy at CLAS and CLAS12: the present and the future

Mesons are the simplest quark bound system, being made by a quark and an anti‐quark pair. Studying their structure and properties is a fundamental step to reach a deep understanding of QCD. For this purpose both a precise determination of the meson spectrum for conventional states and the search for states beyond the simple qq configurations, as hybrids (qqg) or glueballs, are needed. Finding evidence for these unconventional states would help in understanding some of the open issues in hadronic physics, as how the quarks are confined within hadrons and what is the role of gluons. These topics are presently studied with the CLAS detector at Jefferson Lab and will be studied with the novel CLAS12 experiment after the 12 GeV upgrade of the facility. In my talk I will present the physics program that is presently in progress and the future perspectives.

Search for Pentaquark States with CLAS at Jefferson Lab

We discuss the experimental program to search for baryon states with exotic flavor quantum numbers using CLAS at Jefferson Lab.

Nucleon resonance excitation with CLAS

The study of the baryon spectrum is a fundamental part of the scientific program in Hall B at Jefferson Laboratory. The so called N* program indeed concerns the measurement of the electromagnetic production of exclusive hadronic final states, with the purpose of extracting information on baryon excited states. CLAS, the CEBAF Large Acceptance Spectrometer, is explicitly designed for conducting a broad experimental program in hadronic physics, using the continuous electron beam provided by the laboratory. An overview of the most recent results is presented.

Recent studies of high lying N* in double charged pion electroproduction

Physics analysis of recent CLAS data on double pion production by virtual photons is presented.