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Abstract
The CMD-3 detector started data taking at the electron-positron collider VEPP-2000 [1] in December 2010. The collected data sample corresponds to an integrated luminosity of 87 pb−1 in the c.m. energy range from 1.06 up to 2 GeV and 91 pb−1 from 0.32 to 1.06 GeV. The integrated luminosity was measured by counting e+e−→ e+e− and e+e−→ γγ events, allowing additional photons in the final state. Preliminary results of the luminosity measurement are presented for various energy ranges and its accuracy is estimated to be 1%.
Highlights
Precise luminosity measurement is a key requirement for many experiments studying hadronic cross sections at e+e− colliders
Preliminary results of the luminosity determination are presented in a wide energy range
In 2011 and 2012, 34 pb−1 of integrated luminosity were collected in the c.m. energy range from 1.0 GeV to 2.0 GeV
Summary
Precise luminosity measurement is a key requirement for many experiments studying hadronic cross sections at e+e− colliders. A systematic uncertainty of the luminosity determination is one of the largest sources of the total uncertainty, which can significantly reduce the hadronic cross section accuracy. It is very important to determine the luminosity by using several well-known QED processes such as e+e− → e+e−, μ+μ−, γγ.
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