Frankfurt 2014 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 17: Hadronenstruktur und -spektroskopie
HK 17.2: Vortrag
Dienstag, 18. März 2014, 14:15–14:30, HZ 1+2
Measurements of Proton Electromagnetic Form Factors in Time-like Region at BESIII — •Dexu Lin1,2,3, Cristina Morales1,2,4, Frank Maas1,2,4, and Paul Larin1,2 — 1Helmholtz-Institut Mainz, 55128 Mainz, Germany — 2Institut für Kernphysik, JGU Mainz, 55099 Mainz, Germany — 3HGS-HIRe for FAIR, 60438 Frankfurt am Mainz, Germay — 4GSI, 64291 Darmstadt, Germay
The proton is the lightest baryon and its internal structure and dynamics can be better understood through the study of its electromagnetic(EM) form factors. In the space-like region there are plenty of statistics already collected by previous experiments and the form factors are very well known. This is not the case of the time-like(TL) region. In the TL region, the ratio of the EM form factors is only known to 11-24% level and the form factors have never been extracted without previous assumption.
BESIII (Beijing Spectrometer III) at BEPCII (Beijing Electron Positron Collider II) is collecting large data samples at J/Ψ, Ψ′′ and XYZ energy range. These data can be used to measure proton EM form factors with ISR (Initial-State-Radiation) method e+e−→ p pγISR. In addition, an energy scan between 2.0 and 3.1 GeV is currently being considered by BESIII. This would make possible the measurement of the proton EM form factors using the process e+e− → p p. Both methods will be summarized in this talk.