Precise measurement of the e~+e~- →π~+π~-(γ) crosssection with the initial state radiation method at BABAR

被引:0
|
作者
王文峰
机构
[1] SLAC,2575 Sand Hill Road,Menlo Park,CA 94025,USA
[2] University of Notre Dame
关键词
pion form factor; ISR; g-2; BABAR;
D O I
暂无
中图分类号
O572.21 [实验与测定];
学科分类号
摘要
We present a precise BABAR measurement on the cross section of the process e+e-→π+π-(γ) from threshold to an energy of 3 GeV with the initial state radiation(ISR) technique,using 232 fb-1 of data collected with the BABAR detector at e+e-center-of-mass energies near 10.58 GeV.The ISR luminosity is determined from a study of the leptonic process e+e-→μ+μ-γ(γ).The leading-order hadronic contribution to the muon magnetic anomaly calculated using the ππ cross section measured from threshold to 1.8 GeV is(514.1±2.2(stat)±3.1(syst))×10-10.
引用
收藏
页码:692 / 697
页数:6
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