Electromagnetic proton form factors: perspectives for PANDA

Egle Tomasi-Gustafsson,Alaa Dbeyssi,S Lunardi,A Nannini,J.J Valiente-Dobon,M Chiari,P Di Nezza,C Signorini,P.G Bizzeti,R Menegazzo,A Dainese,C Bucci

doi:10.1051/epjconf/20146606024

Abstract

The PANDA collaboration studies fundamental aspects of the strong interaction in the transition region between non-perturbative and perturbative QCD, investigating charmonium spectroscopy, hybrids and glueballs, hypernuclei, light and heavy meson production with antiproton beams. In this contribution we focus on leptonic final channels which give access to nucleon electromagnetic form factors. The expected precision on the electric and magnetic form factors of the proton in the time-like region and the radiative corrections to be applied to the data are discussed.

Highlights

The PANDA experiment is one of the four main experiments at the Facility for Antiproton and Ion Research (FAIR) [1]
FAIR is under construction on the area of GSI, in Darmstadt (Germany) and it is intended to gather a large community of 2500 physicists interested in hadron and nuclei structure, in nuclear matter, in plasma and atomic physics, around the main experiments: PANDA, CBM, NUSTAR, and APPA
After a brief introduction on the FAIR facility and on the PANDA experiment, we have presented the results of a simulation dedicated to the measurement of the time-like electromagnetic form factors of the proton, based on the PANDARoot software and using the PANDAGrid

Summary

Introduction

The PANDA experiment (antiProton ANnichilation at DArmstadt) is one of the four main experiments at the Facility for Antiproton and Ion Research (FAIR) [1]. FAIR is under construction on the area of GSI, in Darmstadt (Germany) and it is intended to gather a large community of 2500 physicists interested in hadron and nuclei structure, in nuclear matter, in plasma and atomic physics, around the main experiments: PANDA, CBM, NUSTAR, and APPA. The detection of an accompanying pion will allow to investigate for the first time the "unphysical region", below the kinematical threshold, q2 = 4m2, m being the proton mass. We present here the status of the feasibility studies of the annihilation reaction p + p → e+ + e− at PANDA, with specific interest in two aspects: event selection and radiative corrections

Simulation

Event selection

Radiative Corrections

Conclusions