Measurement of the hadronic cross section via radiative return at DAΦNE

被引：5
|
作者：
Denig, AG [1 ]
机构：
[1] Univ Karlsruhe, IEKP, D-76021 Karlsruhe, Germany
来源：
INTERNATIONAL JOURNAL OF MODERN PHYSICS A | 2005年 / 20卷 / 8-9期
关键词：
muon anomaly; hadronic cross section; pion electromagnetic formfactor;
D O I：
10.1142/S0217751X05023670
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
The cross section α(e(+)e(-) → π(+)π(-)-γ) has been measured with the KLOE detector at the electron-positron collider DAΦ NE, at an energy W = mφ = 1.02 GeV. We perform this measurement as a function of the π(+)π(-) invariant mass, M-ππ. The photon in the above process is due to Initial State Radiation. Dividing by a theoretical radiator function, we obtain the cross section α(e(+)e(-) - π(+)π(-)) for the mass range 0.35 < M-ππ(2) < 0.95 GeV2 with an overall accuracy of 1.3%. We also calculate the hadronic contribution of the two-pion channel to the anomalous magnetic moment of the muon for the given mass range: α(ππ)(μ) = (388.7 ± 0.8(stat) ± 3.5(syst) ± 3.5(theo)). 10(-10).
引用
收藏
页码：1935 / 1938
页数：4
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