### Conveners

#### Parallel session B4: Light Mesons and Baryons 4

- Meike Küßner (Ruhr-Universität Bochum)

The measurement of exclusive$e^+e^-$ to hadrons processes is a significant part of the physics program of $BABAR$ experiment, aimed to improve the calculation of the hadronic contribution to the muon g−2 and to study the intermediate dynamics of the processes. We present the most recent studies performed on the full data set of about 470 $\text{fb}^{-1}$ collected at the PEP-II $e^+e^-$...

The $\pi^- + {^2{\rm H}} \rightarrow n + n$, $\pi^- + {^3{\rm H}} \rightarrow n + n + n$, $\pi^- + {^3{\rm He}} \rightarrow n + d$ and $\pi^- + {^3{\rm He}} \rightarrow p + n + n$ capture reactions from the lowest atomic orbitals are studied under full inclusion of final state interactions. Our results are obtained with the single-nucleon and two-nucleon transition operators derived at leading...

Hadron photoproduction is an essential experimental tool that gives important information on the spectroscopic and structural nature of hadrons. At large photon energies and low invariant mass of the $\pi\pi$ subsystem, the differential cross section is dominated by the prominent $\rho(770)$ resonance. At forward angles, the production of the $\rho$ is mostly diffractive, and exhibits a...

In this work, we study the general properties of the scattering amplitude with the channel couplings using the effective field theory. Recently, exotic hadrons have drawn intensive attention. Internal structure of these hadrons is related to the scattering lengths and effective range. When an exotic hadron locates near the threshold with channel couplings, we must consider the threshold...

The GlueX Experiment in Hall D at Jefferson Laboratory has accumulated high-statistics samples of photoproduction data off the proton in recent years. Since the light vector mesons $\rho$, $\omega$ and $\phi$ have the same $J^{PC}$ quantum numbers as the incident photon, these mesons are copiously produced in photoproduction and therefore, make GlueX an ideal place to study their production...