Measurement of Hadronic Cross Sections at BESIII

Abstract

The uncertainties of the Standard Model prediction of the anomalous magnetic moment of the muon are currently completely dominated by hadronic contributions. The largest contribution is due to the hadronic vacuum polarization. Hadronic cross sections measured at $e^{+}{e}^{-}$ colliders can be exploited as experimental input to improve the calculations, making use of the optical theorem. At the BESIII experiment in Beijing these cross sections are determined using different methods. At center-of-mass energies above 2 GeV exclusive and inclusive cross sections can be measured in an energy scan. Additionally, cross sections can be determined starting from the ${\pi }^{+}{\pi }^{-}$ mass threshold using the method of Initial State Radiation. An overview of the recent results and the status of the analyses is provided.

Talk presented CIPANP2018. 10 pages, LaTeX, 7 pdf figures

References in corpus (7)

• Reevaluation of the hadronic vacuum polarisation contributions to the Standard Model predictions of the muon g-2 and alpha(mZ) using newest hadronic cross-section data
• Calculation of the hadronic vacuum polarization contribution to the muon anomalous magnetic moment
• Observation of a near-threshold enhancement in the e+e- -->Lambda_c+Lambda_c- cross section using initial-state radiation
• The Proton Radius Puzzle
• Hadronic structure functions in the $e^{+}{e}^{-}\to \bar{\Lambda }\Lambda$ reaction
• Precision measurement of the $e^{+}{e}^{-}\to {\Lambda }_c^{+}{\bar{\Lambda }}_c^{-}$ cross section near threshold
• Periodic interference structures in the time-like proton form factor