Speakers
Description
In the domain of hadron spectroscopy, the investigation of meson resonances plays a pivotal role. This study focuses on the significance of two-pion photoproduction as a prominent avenue for studying meson resonances in the $\pi\pi$ system. By employing the Regge formalism, our model incorporates the background contribution from the well-known ``Deck Mechanism" and emphasizes the significant $\rho(770)$ resonance, representing the $P$-wave contribution arising from pomeron and $f_2$ exchanges. Extending the model, we account for additional physics by encompassing scalar mesons, namely $\sigma$ and $f_0(980)$, contributing to the $S$-wave behavior, while also considering non-resonant $P$ and $S$ components. After fitting the model to a subset of moments, we proceed to compare our predictions for the angular moments with experimental data obtained from CLAS. Our analysis reveals a noticeable breakdown of the approximate s-channel helicity conservation (SCHC) at higher four momentum transfers, adding new insights into the intricate dynamics of meson resonances. Furthermore, we extract the $t$-dependence of the Regge amplitude residue function for the subdominant exchanges, shedding light on their contribution to the overall dynamics.
| Parallel Session | Hadron Spectroscopy |
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