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HK: Fachverband Physik der Hadronen und Kerne

HK 1: Hadron Structure and Spectroscopy I

HK 1.4: Vortrag

Montag, 14. März 2016, 15:00–15:15, S1/01 A5

Measurements of e⁺e⁻ → nn cross Section from 2015 Scan Data at BESIII — •Samer Ahmed^1,2, Alaa Dbeyssi^1,2, Paul Larin^1,2, Dexu Lin^1,2, Frank Maas^1,2,3, Cristina Morales^1,2, Christoph Rosner^1,2, and Yadi Wang^1,2 for the BESIII collaboration — ¹Helmholtz-Institut Mainz, Germany — ²Institute of Nuclear Physics, Johannes Gutenberg-University of Mainz, Germany — ³PRISMA Cluster of Excellence, Mainz, Germany

The neutron structure and dynamics can be understood through the study of its electromagnetic form factors (FFs). In the time-like region few experiments had been performed so far, none of them had the possibility to determinate the electric and magnetic FFs and even their ratio. Therefore, a large data sample [2.0 - 3.08 GeV] with a total luminosity of 523.5 pb⁻¹ has been collected in Beijing Spectrometer III (BESIII) at the Beijing Electron Positron Collider II (BEPCII). With the collected data, it is expected to separately determine the electric and the magnetic FFs of neutron and enhance the knowledge of its structure. In this contribution, we will present the current status of nn analysis and the efforts of extracting the ratio of the neutron FFs.