Speaker
Prof.
Liping Gan
(University of North Carolina Wilmington, USA)
Description
Decays of the $\eta$ meson provide a unique, flavor-conserving laboratory to probe the isospin violating sector of low energy QCD and search for new physics beyond the Standard Model. The JEF Experiment has been developed in Hall D at Jlab to measure $\eta$ decays emphasizing on rare neutral modes with two orders of magnitude background reduction compared to the previous experiments. The projected results will have profound physics impact: the $\eta\rightarrow B\gamma\rightarrow\pi^0\gamma\gamma$ decay provides a stringent constraint on a dark leptophobic gauge boson (B) coupled to baryon number in 140-550 MeV mass range; C-violating $\eta$ decays offer the best window for direct constraint on C-violating and P-conserving (CVPC) new physics; the Dalitz distribution of $\eta\rightarrow\pi^0\gamma\gamma$ probes interplay of vector & scalar meson resonances in ChPT; $\eta\rightarrow 3\pi$ will offer an improvement in the uncertainty of the light quark mass ratio. The detail of the experiment will be presented.
Author
Prof.
Liping Gan
(University of North Carolina Wilmington, USA)
