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arxiv: 1510.02667 · v2 · pith:CGNJZNW3new · submitted 2015-10-08 · ✦ hep-ex

Measurement of R_{uds} and R between 3.12 and 3.72 GeV at the KEDR detector

classification ✦ hep-ex
keywords energydetectorkedrmeasurementpointstextaccuracyaccurate
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Using the KEDR detector at the VEPP-4M $e^+e^-$ collider, we have measured the values of $R_{\text{uds}}$ and $R$ at seven points of the center-of-mass energy between 3.12 and 3.72 GeV. The total achieved accuracy is about or better than $3.3\%$ at most of energy points with a systematic uncertainty of about $2.1\%$. At the moment it is the most accurate measurement of $R(s)$ in this energy range.

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