Confirmation of the J_psi meson mass peak

R. Felch

06/06/2017

Abstract

Looking at dimuon events with mass in the 2 - 5 GeV, a dominant mass peak is observed at 3.1 GeV.  This peak has been identified as the J_psi meson in the literature. 

Introduction

A noticable peak is observed in the dimuon events(with 2 global muons selected) with a mass at 3.1 GeV.  Brief investigation online indicates this particle has been identified as the J_psi meson.

Procedures

Results

Selecting dimuon events with invariant mass between 2 - 5 GeV there is no obvious peak initially.  However, changing the bin size from 1 to .05 GeV, a dominant peak emerges at 3.1 GeV.  This is consistent with the J_psi particle reported in the literature.

Figures

Discussion and Conclusions

The dominant peak found in the dimuon events is at 3.1 GeV.  This is consistent with a J_psi particle.

Bibliography

https://en.wikipedia.org/wiki/J/psi_meson