publication . Preprint . Article . 2019

Study of the a1 (1269) resonance in the γp →π+π+π-n reaction *

Zhang, Xu; Xie, Ju-Jun;
Open Access English
  • Published: 01 Jun 2019
We investigate the discovery potential of the $a_1(1260)$ photoproduction in the $\gamma p \to a_1(1260)^+ n$ and $\gamma p \to \pi^+\pi^+\pi^- n$ reactions via the $\pi$-exchange mechanism. For the $\gamma p \to \pi^+\pi^+\pi^- n$ reaction, we perform a calculation for the differential and total cross sections by including the contributions from the $a_1(1260)$ intermediate resonance decaying into $\rho \pi$ then into $\pi^+\pi^+\pi^-$. Besides, the non-resonance process is also considered. With a lower mass of $a_1(1260)$, we get a fairly good description of the experimental data for the invariant $\pi^+\pi^+\pi^-$ mass distributions. For the $\gamma p \to a_1...
free text keywords: High Energy Physics - Phenomenology, Nuclear and High Energy Physics, Instrumentation, Astronomy and Astrophysics, Resonance, Atomic physics, Physics, Nuclear magnetic resonance
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publication . Preprint . Article . 2019

Study of the a1 (1269) resonance in the γp →π+π+π-n reaction *

Zhang, Xu; Xie, Ju-Jun;