Close to thresholdη′ meson production in proton-proton collisions at cosy-11

E Czerwiński,P Moskal,M Silarski

doi:10.1051/epjconf/20148102003

Abstract

Intensive quest for the eta and eta' bound states is currently ongoing at both theoretical and experimental levels e.g. at COSY, ELSA, GSI, JINR, JPARC, LPI, and MAMI. These studies were already supported by data provided by the COSY-11 collaboration including determination of the total width of the eta' meson. In addition, the first rough estimation of the eta'-N interaction from the excitation function of the cross section for the pp-->pp eta' reaction was also performed. Recent precise measurement in this field from the COSY-11 experiment allows to summarize results on the eta' meson production cross section in proton-proton collisions at COSY-11.

Highlights

Intensive quest for the η and η bound states is currently ongoing at both theoretical e.g. [1,2,3,4,5,6,7,8] and experimental levels e.g. COSY [9,10,11,12,13,14], ELSA [15], GSI [16, 17], JINR [18], JPARC [19, 20], LPI [21], and MAMI [22, 23]. These studies were already supported by data provided by the COSY–11 collaboration [24,25,26,27] including determination of the total width of the η meson [28, 29]
The binding energies, meson-nucleon scattering lengths and in-medium masses of the η and η are sensitive to the flavoursinglet component in the mesons and to the non-perturbative glue associated with axial U(1)
The quark condensate is modified in nucleus which changes the properties of hadrons in nuclear medium and these medium modifications can be understood at the quark level through coupling of the scalar isoscalar σ mean fields in the nucleus to the light quarks in the hadron

Summary

Introduction

Intensive quest for the η and η bound states is currently ongoing at both theoretical e.g. [1,2,3,4,5,6,7,8] and experimental levels e.g. COSY [9,10,11,12,13,14], ELSA [15], GSI [16, 17], JINR [18], JPARC [19, 20], LPI [21], and MAMI [22, 23]. [1,2,3,4,5,6,7,8] and experimental levels e.g. COSY [9,10,11,12,13,14], ELSA [15], GSI [16, 17], JINR [18], JPARC [19, 20], LPI [21], and MAMI [22, 23] These studies were already supported by data provided by the COSY–11 collaboration [24,25,26,27] including determination of the total width of the η meson [28, 29]. Recent precise measurement in this field from the COSY–11 experiment [31] allows to summarize results on the η meson production cross section in proton-proton collisions at COSY–11

Motivation

The COSY–11 experiment

Conclusions