Photo-production of tensor mesons

Ju-Jun Xie,Eulogio Oset,Li-Sheng Geng,A Wrońska,C Guaraldo,A Magiera,H Ströher

doi:10.1051/epjconf/201613005021

Abstract

Assuming that the f 2 (1270), f ′2 (1525), a 2 (1320), and K * 2 (1430) resonances are dynamically generated states from the vector meson-vector meson interactions in L = 0 and spin 2, we study the γp → f 2 (1270)[f ′2 (1525)]p , γp → a 0 2 (1320)p , and γp → K * 2 (1430)Λ(Σ) reactions. For the γp → f 2 (1270)p reaction, we find that the theoretical results for the differential cross sections are in good agreement with the experimental measurements and provide support for the molecular picture of the f 2 (1270) in the first baryonic reaction where it has been tested. Furthermore, we predict also the total and differential cross sections for other reactions. The results can be tested in future experiments and therefore offer new clues on the nature of these tensor states.

Highlights

Within quark models, mesons are made of quark-antiquark pairs and baryons are composed of three quarks in the low energy region
For the γp → f2(1270)p reaction, we find that the theoretical results for the differential cross sections are in good agreement with the experimental measurements and provide support for the molecular picture of the f2(1270) in the first baryonic reaction where it has been tested
We study the photo-production of those tensor mesons, assuming that the f2(1270), f2(1525), a2(1320), and K2∗(1430) are dynamically generated states from the VV interaction

Summary

Introduction

Mesons are made of quark-antiquark pairs and baryons are composed of three quarks in the low energy region. Recent observations of the new baryonic Pc states [1] and the mesonic XYZ states [2,3,4,5] by various collaborations have challenged this conventional wisdom. Many low-lying states, even those long believed to be conventional qq (or qqq) states, may have large components of other nature. Agreement with experimental data turns out to be quite good, providing support to the underlying assumption that these states contain large meson-meson components. Along this line, we study the photo-production of those tensor mesons, assuming that the f2(1270), f2(1525), a2(1320), and K2∗(1430) are dynamically generated states from the VV interaction

Formalism and ingredients

Numerical results

Conclusions