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arXiv · 1805.06235

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

V. V. Anashin·O. V. Anchugov·V. M. Aulchenko·E. M. Baldin·G. N. Baranov·A. K. Barladyan·A. Yu. Barnyakov·M. Yu. Barnyakov·S. E. Baru·I. Yu. Basok·A. M. Batrakov·E. A. Bekhtenev·A. E. Blinov·V. E. Blinov·A. V. Bobrov·V. S. Bobrovnikov·A. V. Bogomyagkov·A. E. Bondar·A. R. Buzykaev·P. B. Cheblakov·V. L. Dorohov·S. I. Eidelman·D. N. Grigoriev·S. A. Glukhov·V. V. Kaminskiy·S. E. Karnaev·G. V. Karpov·S. V. Karpov·K. Yu. Karukina·D. P. Kashtankin·P. V. Kasyanenko·T. A. Kharlamova·V. A. Kiselev·V. V. Kolmogorov·S. A. Kononov·K. Yu. Kotov·A. A. Krasnov·E. A. Kravchenko·V. N. Kudryavtsev·V. F. Kulikov·G. Ya. Kurkin·I. A. Kuyanov·E. B. Levichev·D. A. Maksimov·V. M. Malyshev·A. L. Maslennikov·O. I. Meshkov·S. I. Mishnev·I. A. Morozov·I. I. Morozov·S. A. Nikitin·I. B. Nikolaev·I. N. Okunev·A. P. Onuchin·S. B. Oreshkin·A. A. Osipov·I. V. Ovtin·S. V. Peleganchuk·S. G. Pivovarov·P. A. Piminov·V. V. Petrov·V. G. Prisekin·O. L. Rezanova·A. A. Ruban·G. A. Savinov·A. G. Shamov·D. N. Shatilov·D. A. Shvedov·B. A. Shwartz·E. A. Simonov·S. V. Sinyatkin·A. N. Skrinsky·A. V. Sokolov·D. P. Sukhanov·A. M. Sukharev·E. V. Starostina·A. A. Talyshev·V. A. Tayursky·V. I. Telnov·Yu. A. Tikhonov·K. Yu. Todyshev·A. G. Tribendis·G. M. Tumaikin·Yu. V. Usov·A. I. Vorobiov·V. N. Zhilich·A. A. Zhukov·V. V. Zhulanov·A. N. Zhuravlev
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Abstract

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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V. V. Anashin, O. V. Anchugov, V. M. Aulchenko, E. M. Baldin, G. N. Baranov, A. K. Barladyan, A. Yu. Barnyakov, M. Yu. Barnyakov, S. E. Baru, I. Yu. Basok, A. M. Batrakov, E. A. Bekhtenev, A. E. Blinov, V. E. Blinov, A. V. Bobrov, V. S. Bobrovnikov, A. V. Bogomyagkov, A. E. Bondar, A. R. Buzykaev, P. B. Cheblakov, V. L. Dorohov, S. I. Eidelman, D. N. Grigoriev, S. A. Glukhov, V. V. Kaminskiy, S. E. Karnaev, G. V. Karpov, S. V. Karpov, K. Yu. Karukina, D. P. Kashtankin, P. V. Kasyanenko, T. A. Kharlamova, V. A. Kiselev, V. V. Kolmogorov, S. A. Kononov, K. Yu. Kotov, A. A. Krasnov, E. A. Kravchenko, V. N. Kudryavtsev, V. F. Kulikov, G. Ya. Kurkin, I. A. Kuyanov, E. B. Levichev, D. A. Maksimov, V. M. Malyshev, A. L. Maslennikov, O. I. Meshkov, S. I. Mishnev, I. A. Morozov, I. I. Morozov, S. A. Nikitin, I. B. Nikolaev, I. N. Okunev, A. P. Onuchin, S. B. Oreshkin, A. A. Osipov, I. V. Ovtin, S. V. Peleganchuk, S. G. Pivovarov, P. A. Piminov, V. V. Petrov, V. G. Prisekin, O. L. Rezanova, A. A. Ruban, G. A. Savinov, A. G. Shamov, D. N. Shatilov, D. A. Shvedov, B. A. Shwartz, E. A. Simonov, S. V. Sinyatkin, A. N. Skrinsky, A. V. Sokolov, D. P. Sukhanov, A. M. Sukharev, E. V. Starostina, A. A. Talyshev, V. A. Tayursky, V. I. Telnov, Yu. A. Tikhonov, K. Yu. Todyshev, A. G. Tribendis, G. M. Tumaikin, Yu. V. Usov, A. I. Vorobiov, V. N. Zhilich, A. A. Zhukov, V. V. Zhulanov, A. N. Zhuravlev. 2018-05-16. Precise measurement of $R_{\text{uds}}$ and $R$ between 1.84 and 3.72 GeV at the KEDR detector. https://doi.org/10.1016/j.physletb.2018.11.012

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