Meson form factors and P→γγ physics at BESIII

Using data consisting of 2.93 fb-1 integrated luminosity at the centre of mass energy √s = 3773 MeV, recorded with the BESIII detector at BEPCII, the cross section and form factor |Fπ|2 was extracted in the energy range 600-900 MeV, using the method of radiative return. The cross section is used as...

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Bibliographic Details
Published inJournal of physics. Conference series Vol. 742; no. 1; pp. 12012 - 12016
Main Author Pettersson, J
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.08.2016
Subjects
Cross-sections
Form factors
Luminosity
Physics
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Summary:Using data consisting of 2.93 fb-1 integrated luminosity at the centre of mass energy √s = 3773 MeV, recorded with the BESIII detector at BEPCII, the cross section and form factor |Fπ|2 was extracted in the energy range 600-900 MeV, using the method of radiative return. The cross section is used as input to calculate the leading-order vacuum polarisation contribution of the e+e-→π+π- channel to (g - 2)μ as aμππ,LO(600 - 900 MeV) = (368.2±2.5stat ±3.3sys) * 10-10. This result is compatible with corresponding values using KLOE data, but disagrees whit BaBar. The ongoing search for e+e-→ηc at BESIII is also discussed.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/742/1/012012