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Studying light flavour resonances with polarised photon beams

The study of exotic mesons such as gluonic hybrids gives a greater insight into how quarks and gluons bind to form such states and hence increase our understanding of the fundamental strong force. Furthermore, the double pion photoproduction is known as a ideal tool for the investigation of nucleon resonances, especially the exotic meson states. Hereby, to study the interference of meson resonance production and meson-baryon rescattering eﬀects, we focus on the reaction 𝛾𝑝 → 𝜋 + 𝜋 − 𝑝 . Aiming at the description of the latest data collected at CLAS12 and GlueX experiments, we used Deck model with a virtual pion exchange to generalize the moment extraction formalism with a linearly polarized photons. We compute the moments of the 𝜋 + 𝜋 − angular distribution with 𝐸 𝛾 = 8 . 5 𝐺𝑒𝑉 2 for 𝐿 = 0 , 1 , 2 , 3 , 4 in the helicity frame i.e the rest frame of the 𝜋𝜋 with the direction opposite to the recoil nucleon deﬁning the 𝑧 axis.