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HK: Fachverband Physik der Hadronen und Kerne

HK 18: Hadron Structure and Spectroscopy 3

HK 18.5: Vortrag

Montag, 23. März 2015, 18:15–18:30, T/SR19

Measurement of the e⁺e⁻ → pp cross section at BESIII using the untagged-initial state radiation technique — •Christoph Rosner¹, Samer Ali Nasher Ahmed¹, Alaa Dbeyssi¹, Paul Larin¹, Dexu Lin¹, Frank Maas^1,2,3, and Cristina Morales¹ — ¹Helmholtz-Institut Mainz, 55128 Mainz, Germany — ²Institute of Nuclear Physics, Mainz, Germany — ³PRISMA Cluster of Excellence, Mainz, Germany

Electromagnetic form factors are fundamental quantities which describe the structure and the internal dynamics of hadrons. In the timelike region, proton form factors are experimentally accessible through the e⁺ + e⁻ ↔ p + p channels. Initial state radiation (ISR) is an effective tool to measure hadronic cross section at high luminosity e⁺e⁻ storage rings, such as the Beijing Electron-Positron Collider II (BEPC-II). This contribution reports on the e⁺+e⁻ → p+p+γ analysis for proton form factor measurements at the Beijing Spectrometer III (BESIII/BEPC-II). The case of untagged ISR photon is presented. Monte Carlo simulations for signal and background processes at center of mass energies 4.23, 4.26 and 4.36 GeV, are described.