XXVIII International Workshop on Deep Inelastic Scattering and Related Subjects

From H1 data on ρ′, ρ″ production to four-pion production in UPC

25 Mar 2020, 11:00

18m

Brooklyn, NY

Contributed Talk Small-x, Diffraction and Vector Mesons Small-x, Diffraction and Vector Mesons

Speaker

Mariola Klusek-Gawenda (Institute of Nuclear Physics Polish Academy of Sciences, Krakow, Poland)

Description

The central issue of the presentation will be theoretical study of four charged pion photoproduction that come from ultraperipheral heavy-ion collision. I take into account the single photoproduction of the radial excitations of the ${\rho }^0$ vector meson. The analysis includes a contribution from the incoherent sum of the ${\rho }^{\prime }(1450)$ and ${\rho }^{″}(1700)$ vs single $\rho (1570)$ vector mesons. I will show that my theoretical model has very good agreement with the experimental data for PbPb $\to$ PbPb${\pi }^{+}{\pi }^{-}$ mechanism. The proposed phenomenology works for the photoproduction of vector meson that decays into a two-pion channel thus using a new H1 experiment data for $\gamma p\to 2{\pi }^{+}2{\pi }^{-}$ process one can make predictions for four charged pions productions in ultra-peripheral heavy ion collisions. I will present the differential and total cross section for the PbPb $\to$ PbPb2${\pi }^{+}$2${\pi }^{-}$ process. Finally, I have got even one order of magnitude larger (at midrapidity) cross section than it was predicted using STARlight generator. Obtained results constitute a comprehensive analysis of ${\rho }^0(770)$ meson excited states that decay into $2{\pi }^{+}2{\pi }^{-}$ channel.