Cross Section and Asymmetry Measurement of Very Forward Neutral Particle Production at RHIC

Yuji Goto

doi:10.1142/s2010194516601101

Abstract

Although air shower observations at the surface of the earth have been developed in order to understand the origin of the ultra high energy cosmic rays, the observations have uncertainties in interpretation of the observed data from the present phenomenological nuclear collision models. Precision measurements of the very forward particle production in the collider experiments improve understanding of particle production processes in the nuclear collisions, and provide large influences on interpretation of the observed data and the origin of the cosmic rays. On the other hand, a large 10% single transverse-spin asymmetry in neutron production from transversely polarized proton collisions was found at the RHIC collider at BNL. It has provided a valuable input for understanding particle production processes in the polarized proton collisions. We will have a new collider experiment at RHIC which has a high resolution and a wide coverage of transverse momentum measurements in order to figure out elementary processes of the air shower generation.

Highlights

In the collider experiments, limited measurements have been performed in the very forward region due to structural limitations of accelerators
A large 10% single transverse-spin asymmetry (SSA) in neutron production from transversely polarized proton collisions was found at RHIC in 2002,1 and improved understanding of the production mechanism with an one particle exchange has been given by following experiments[2, 3] and theoretical studies.[4]
Air shower observations at the surface of the earth have been developed in order to understand the origin of the ultra high energy cosmic rays, the observations have uncertainties in interpretation of the observed data from the present phenomenological nuclear collision models

Summary

Introduction

In the collider experiments, limited measurements have been performed in the very forward region due to structural limitations of accelerators. There are precision measurements of proton-proton colliders at RHIC and LHC for further understanding. A large 10% single transverse-spin asymmetry (SSA) in neutron production from transversely polarized proton collisions was found at RHIC in 2002,1 and improved understanding of the production mechanism with an one particle exchange has been given by following experiments[2, 3] and theoretical studies.[4]

Results

Conclusion