Conveners
Parallel session C4
- Deborah Rönchen (Forschungszentrum Jülich)
We discuss the central exclusive photoproduction of $\pi^+ \pi^-$ pairs in diffractive photon-proton and in proton-proton collisions at high energies. We consider the resonant ($\rho$, $\omega$, $f_2(1270)$) and non-resonant (Drell-S\"oding) contributions. Our calculation is based on the tensor-pomeron approach. We present a completely new calculation of the non-resonant term for the reaction...
The Particle Data Group (PDG) lists three scalar nonets, denoted $0^+_A, 0^+_B, 0^+_C$: one containing [$a_0(980), K_0^*(700)$], another containing [$a_0(1450), K_0^*(1430)$], and the third containing [$a_0(1710), K_0^*(1950)$]. We begin by noting that, within the tetraquark picture, two distinct color-spin structures are required to describe the tetraquark configurations of the [$a_0(980),...
The High Acceptance Di-lepton Spectrometer (HADES) at GSI plays a crucial role in exploring baryonic resonance characteristics and their mesonic decay channels. The pion-beam facility at GSI enables the direct formation of baryonic resonances at a fixed center of mass energy ($\sqrt{s}$) in the $s$-channel. This provides a distinct advantage over proton-induced reactions and complements...
Excited nucleon states ($N^*$ and $\Delta$ resonances) provide an important probe of the non-perturbative regime of Quantum Chromodynamics (QCD) and the internal structure of baryons. In this work, we study the production mechanisms of these resonances in the reaction $pp\rightarrow NN\pi$, which also serves as a baseline for interpreting heavy-ion collision data. The High Acceptance...
