Wuppertal 2015 – scientific programme

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T: Fachverband Teilchenphysik

T 98: Soft QCD und PDF fits

T 98.4: Talk

Thursday, March 12, 2015, 17:30–17:45, K.11.20 (K5)

Application of a Regge Model to the Photoproduction of Pion Pairs — •Arthur Bolz¹, Carlo Ewerz^2,3, Markos Maniatis⁴, Otto Nachtmann², Michel Sauter¹, and André Schöning¹ — ¹Physikalisches Institut, Universität Heidelberg, Im Neuenheimer Feld 226, D-69120 Heidelberg, Germany — ²Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 16, D-69120 Heidelberg, Germany — ³ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, D-64291 Darmstadt, Germany — ⁴Departamento de Ciencias Básicas, Universidad del Bío-Bío, Avda. Andrés Bello s/n, Casilla 447, Chillán 3780000, Chile

In a recent publication (arXiv:1409.8483) a model in the spirit of Regge theory is used to describe the reaction γ p → π⁺ π⁻ p at high energies. Both resonant pion-pion production via the meson resonances ρ(770), ω(782), ρ(1450) and f₂(1270) as well as non-resonant amplitudes are considered. Photon and proton interact by the exchange of the photon, the pomeron and reggeons as well as by a yet unobserved but possible odderon.
Cross sections calculated from this model and their dependencies on various kinematic quantities will be discussed and compared to experimental data. The focus will be on angular distributions which feature asymmetries that could be used for an odderon discovery.