Measurement of Baryon Electromagnetic Form Factors at BESIII

TL;DR

This paper reports measurements of baryon electromagnetic form factors at BESIII using $e^+e^-$ collisions, providing new data on proton and lambda pair production and discussing future high-luminosity scans.

Contribution

It presents the first measurements of baryon form factors at BESIII in the 2.0-4.6 GeV energy range, including results from specific annihilation channels and future prospects.

Findings

Measured $e^+e^- ightarrow par{p}$ and $e^+e^- ightarrow \Lambda ar{\Lambda}$ cross sections.

Provided data supporting the energy dependence of baryon form factors.

Discussed future high-luminosity energy scans and radiative return measurements.

Abstract

The Beijing $e^+e^-$-collider (BEPCII) is a double-ring symmetric collider running at center-of-mass energies between 2.0 and 4.6 GeV. This energy range allows the BESIII-experiment to measure baryon electromagnetic form factors in direct $e^+e^-$-annihilation and in initial state radiation processes. In this paper, results on $e^+e^-\rightarrow p\bar{p}$ and $e^+e^-\rightarrow \Lambda \bar{\Lambda}$ based on data collected by BESIII in 2011 and 2012 are presented. Expectations from the BESIII high luminosity energy scan from 2015 and from radiative return at different center-of-mass energies are also reported.