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arxiv: 1805.06235 · v3 · pith:DD2TZATRnew · submitted 2018-05-16 · ✦ hep-ex

Precise measurement of R_{uds} and R between 1.84 and 3.72 GeV at the KEDR detector

classification ✦ hep-ex
keywords energykedrmeasurementprecisepreviousrangetextaccuracy
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The present work continues a series of the KEDR measurements of the $R$ value that started in 2010 at the VEPP-4M $e^+e^-$ collider. By combining new data with our previous results in this energy range we measured the values of $R_{\text{uds}}$ and $R$ at nine center-of-mass energies between 3.08 and 3.72 GeV. The total accuracy is about or better than $2.6\%$ at most of energy points with a systematic uncertainty of about $1.9\%$. Together with the previous precise $R$ measurement at KEDR in the energy range 1.84-3.05 GeV, it constitutes the most detailed high-precision $R$ measurement near the charmonium production threshold.

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