Bonn 2020 – wissenschaftliches Programm

Die DPG-Frühjahrstagung in Bonn musste abgesagt werden! Lesen Sie mehr ...

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

HK: Fachverband Physik der Hadronen und Kerne

HK 23: Hadron Structure and Spectroscopy VI

HK 23.5: Vortrag

Mittwoch, 1. April 2020, 15:30–15:45, J-HS M

Towards a Measurement of the Hadronic R Value Using Initial State Radiation at BESIII — •Thomas Lenz, Achim Denig, and Christoph Florian Redmer for the BESIII collaboration — Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, Deutschland

The hadronic vacuum polarization is an important contribution to the running QED coupling constant at the Z pole, αQED(MZ2), and the anomalous magnetic moment of the muon aµ= (gµ− 2) / 2. Both quantities allow for crucial precision tests of the Standard Model and their theoretical uncertainties are dominated by hadronic contributions. Experimental inputs, like the hadronic R value Rhad = σ(e+   ehadrons) / σ(e+   e → µ+   µ), are used in dispersive approaches to calculate these quantities.

The large data sets collected at the BESIII experiment at the e+   e collider BEPCII in Beijing, China, offer an excellent environment for initial state radiation (ISR) measurements. This presentation discusses the feasibility of using the ISR technique to measure Rhad in a continuous spectrum.

Supported by DFG (SFB 1044).

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2020 > Bonn