Measurement of $R$ between 1.84 and 3.05 GeV at the KEDR detector
V.V. Anashin, V.M. Aulchenko, E.M. Baldin, A.K. Barladyan, A.Yu., Barnyakov, M.Yu. Barnyakov, S.E. Baru, I.Yu. Basok, A.M. Batrakov, A.E., Blinov, V.E. Blinov, A.V. Bobrov, V.S. Bobrovnikov, A.V. Bogomyagkov, A.E., Bondar, A.R. Buzykaev, S.I. Eidelman, D.N. Grigoriev
TL;DR
This paper reports precise measurements of the ratio R of hadronic to muonic cross sections in electron-positron collisions between 1.84 and 3.05 GeV, improving the accuracy of existing data.
Contribution
It provides new, high-precision measurements of R at thirteen energy points in a previously less-explored energy range, with systematic uncertainties below 2.4%.
Findings
Achieved measurement accuracy of about 3.9% or better at most energy points.
Systematic uncertainties kept below 2.4%.
Extended the dataset of R values in the 1.84 to 3.05 GeV energy range.
Abstract
Using the KEDR detector at the VEPP-4M collider, we have determined the values of at thirteen points of the center-of-mass energy between 1.84 and 3.05 GeV. The achieved accuracy is about or better than at most of the energy points with a systematic uncertainty less than .
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