Volume 380 - Particles and Nuclei International Conference 2021 (PANIC2021) - QCD, spin physics and chiral dynamics
Recent result of nucleon time-like form factors at BESIII
Y. Wang
Full text: pdf
Pre-published on: March 09, 2022
Published on:
Abstract
Precise experimental measurements of the nucleon form factors are a test-bed
for understanding the nucleon's properties and dynamical behavior emerge from QCD.
With high statistics, the cross section of $e^+e^-\to p\bar{p}$ and $e^+e^-\to n\bar{n}$
are both measured with the highest precision in a wide $q^2$ range. An oscillation behavior is observed both on the proton and neutron effective form factor, but with an orthogonal phase difference. The electro and magnetic form factors of proton and the ratio between them are measured simultaneously with much improved precision compared with previous results
through the direct annihilation method using the energy scan data from $\sqrt{s}=2.0$ to 3.08 GeV or through ISR method using data at $\sqrt{s}=3.773$ to 4.6 GeV.
With the ISR technique, the form factor measurement can reach as low as the mass threshold
of $p\bar{p}$ or $n\bar{n}$.
DOI: https://doi.org/10.22323/1.380.0366
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