The Forward Tagger Detector for CLAS12 at Jefferson Lab and the MesonEx Experiment

Abstract

This document is organized as follows. The first Chapter illustrates the physical motivations of the MesonEx program, and presents the experiment. The second Chapter describes the CLAS spectrometer, its upgrade to CLAS12, and the new Forward Tagger Facility. Chapter 3 shows the detailed characterization of the FT-Cal components, and the results obtained from the two small-scale prototypes. Chapters 4 and 5 contain, respectively, the description of the amplitude used to generate pseudo-events for the reaction γ * p → pπ 0 η, and the analysis of the CLAS data used to validate the model and fix the free parameters. Finally, the sixth Chapter describes the full partial wave analysis performed on the MesonEx pseudo-data, used to estimate the sensitivity of the experiment to the discovery of a possible exotic meson.

The Meson Spectroscopy Program at the Jefferson Laboratory

“…Similar tests (see for instance Ref. [16] for the γp → ηπ 0 p channel) show that partial-wave analyses will be feasible with CLAS12 data without any particular problem related to the limited apparatus acceptance, with a sensitivity on signal production which can reach the level of a few percent.…”

The Meson Spectroscopy Program Using the Forward Tagger with CLAS12 at Jefferson Lab

“…The HASPECT (Hadron SPEctroscopy CenTer) group is a collaboration of several of the groups interested in the Jefferson Lab meson spectroscopy program, from both theoretical and experimental backgrounds, who have embarked on a series of pathfinder analyses [14] on data from CLAS at 6 GeV, with the aim of developing the required tools and procedures for robust and effective analysis of data from CLAS12.…”