Measurement of the e(+)e(-) -> pi(+) pi(-) cross section between 600 and 900 MeV using initial state radiation
2016 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 753, 629-638 p.Article in journal (Refereed) PublishedText
We extract the e(+) e(-) -> pi(+) pi(-) cross section in the energy range between 600 and 900 MeV, exploiting the method of initial state radiation. A data set with an integrated luminosity of 2.93 fb(-1) taken at a center-of-mass energy of 3.773 GeV with the BESIII detector at the BEPCII collider is used. The cross section is measured with a systematic uncertainty of 0.9%. We extract the pion form factor vertical bar F pi vertical bar(2) as well as the contribution of the measured cross section to the leading-order hadronic vacuum polarization contribution to (g - 2)(mu). We find this value to be a(mu)(pi pi,LO) (600-900 MeV) = (368.2 +/- 2.5(stat)+/- 3.3(sys)).10(-10), which is between the corresponding values using the BaBar or KLOE data.
Place, publisher, year, edition, pages
2016. Vol. 753, 629-638 p.
Hadronic cross section, Muon anomaly, Initial state radiation, Pion form factor, BESIII
IdentifiersURN: urn:nbn:se:uu:diva-280251DOI: 10.1016/j.physletb.2015.11.043ISI: 000368783600087OAI: oai:DiVA.org:uu-280251DiVA: diva2:914442