Measurement of R between 1.84 and 3.05 GeV at the KEDR detector

Anashin, V.V.; Aulchenko, V.; Baldin, E. M.; Barladyan, A.K.; Barnyakov, A.; Barnyakov, M.Yu.; Baru, S.E.; Basok, I.Yu.; Batrakov, A. M.; Blinov, A. E.; Blinov, V.; Bobrov, A.; Bobrovnikov, V. S.; Bogomyagkov, A.; Bondar, A.; Бузыкаев, А. Р.; Eidelman, S.; Grigoriev, D.N.; Glukhovchenko, Yu.M.; Karnaev, S. E.; Karpov, G. V.; Karpov, S. V.; Kasyanenko, P.V.; Kharlamova, T.; Киселев, В. А.; Kolmogorov, V. V.; Kononov, S.A.; Kotov, K.; Kravchenko, E. A.; Kudryavtsev, V.; Kulikov, V.; Kurkin, G.Ya.; Kuyanov, I. A.; Купер, Э. А.; Levichev, E.; Maksimov, D.A.; Малышев, В. М.; Maslennikov, A. L.; Meshkov, O.; Mishnev, S. I.; Морозов, И. И.; Muchnoi, N. Yu.; Neufeld, V. V.; Никитин, С. А.; Nikolaev, I. B.; Okunev, I.N.; Onuchin, A. P.; Oreshkin, S.B.; Осипов, А. А.; Ovtin, I.; Peleganchuk, S. V.; Pivovarov, S.G.; Piminov, P.; Petrov, Vladimir; Prisekin, V.G.; Rezanova, O. L.; Рубан, А.А.; Sandyrev, V. K.; Savinov, G.A.; Shamov, A.G.; Shatilov, D.; Shwartz, B.; Симонов, Е. А.; Sinyatkin, S. V.; Skrinsky, A.N.; Sokolov, A.; Soukharev, A. M.; Starostina, E.V.; Talyshev, A.; Tayursky, V.A.; Telnov, V. I.; Tikhonov, Yu. A.; Todyshev, K. Yu; Tumaikin, G.M.; Usov, Y.; Воробйов, А.І.; Zhilich, V.; Zhulanov, V.; Журавлев, А. Н.

doi:10.1016/j.physletb.2017.04.073

Cited by 31 publications

(26 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Only part of this cross-section was taken in to account before via "isospin relation" from e + e − → η2π + 2π − as shown in Fig. 17. [47], KEDR [48,49]. In general, these measurements are consistent.…”

Section: Unaccounted Modessupporting

confidence: 62%

Status of R(s) measurements by energy scan method

Ignatov

2018

EPJ Web Conf.

View full text Add to dashboard Cite

show abstract

Section: Unaccounted Modessupporting

confidence: 62%

Status of R(s) measurements by energy scan method

Ignatov

2018

EPJ Web Conf.

View full text Add to dashboard Cite

show abstract

“…At that time, the most precise data in that region was provided by BES [52,53,[55][56][57] inclusive measurements, which are much higher than theoretical pQCD predictions and data from exclusive measurements. Newer experimental measurements by KEDR [68][69][70] are significantly lower and compatible with pQCD. Hence, in the present analysis of charm data, we directly use pQCD without any additional normalization.…”

Section: Charm Vector Correlatormentioning

confidence: 96%

Precise determination of αs from relativistic quarkonium sum rules

Boito

Mateu

2020

J. High Energ. Phys.

View full text Add to dashboard Cite

We determine the strong coupling α s (m Z ) from dimensionless ratios of roots of moments of the charm-and bottom-quark vector and charm pseudo-scalar correlators, dubbed R X,n q ≡ (M X,n q ) 1 n /(M X,n+1 q ) 1 n+1 , with X = V, P , as well as from the 0-th moment of the charm pseudo-scalar correlator, M P,0 c . In the quantities we use, the mass dependence is very weak, entering only logarithmically, starting at O(α 2 s ). We carefully study all sources of uncertainties, paying special attention to truncation errors, and making sure that orderby-order convergence is maintained by our choice of renormalization scale variation. In the computation of the experimental uncertainty for the moment ratios, the correlations among individual moments are properly taken into account. Additionally, in the perturbative contributions to experimental vector-current moments, α s (m Z ) is kept as a free parameter such that our extraction of the strong coupling is unbiased and based only on experimental data. The most precise extraction of α s from vector correlators comes from the ratio of the charm-quark moments R V,2 c and reads α s (m Z ) = 0.1168 ± 0.0019, as we have recently discussed in a companion letter. From bottom moments, using the ratio R V,2 b , we find α s (m Z ) = 0.1186 ± 0.0048. Our results from the lattice pseudo-scalar charm correlator agree with the central values of previous determinations, but have larger uncertainties due to our more conservative study of the perturbative error. Averaging the results obtained from various lattice inputs for the n = 0 moment we find α s (m Z ) = 0.1177 ± 0.0020. Combining experimental and lattice information on charm correlators into a single fit we obtain α s (m Z ) = 0.1170 ± 0.0014, which is the main result of this article.

show abstract

“…This is the main result of our paper. The contributions of the electroweak interaction and the hadronic interaction have been updated recently [39] including new hadronic measurements [40,41]: …”

mentioning

confidence: 99%

Revised and improved value of the QED tenth-order electron anomalous magnetic moment

2018

View full text Add to dashboard Cite

In order to improve the theoretical prediction of the electron anomalous magnetic moment a e we have carried out a new numerical evaluation of the 389 integrals of Set V, which represent 6,354 Feynman vertex diagrams without lepton loops. During this work, we found that one of the integrals, called X024, was given a wrong value in the previous calculation due to an incorrect assignment of integration variables. The correction of this error causes a shift of −1.26 to the Set V contribution, and hence to the tenth-order universal (i.e., mass-independent) term A1 . The previous evaluation of all other 388 integrals is free from errors and consistent with the new evaluation. Combining the new and the old (excluding X024) calculations statistically, we obtain 7.606ð192Þðα=πÞ 5 as the best estimate of the Set V contribution. Including the contribution of the diagrams with fermion loops, the improved tenth-order universal term becomes A ð10Þ 1 ¼ 6.675ð192Þ. Adding hadronic and electroweak contributions leads to the theoretical prediction a e ðtheoryÞ ¼ 1159652182.032ð720Þ × 10 −12 . From this and the best measurement of a e , we obtain the inverse fine-structure constant α −1 ða e Þ ¼ 137.0359991491ð331Þ. The theoretical prediction of the muon anomalous magnetic moment is also affected by the update of QED contribution and the new value of α, but the shift is much smaller than the theoretical uncertainty.

show abstract

Measurement of R between 1.84 and 3.05 GeV at the KEDR detector

Cited by 31 publications

References 27 publications

Status of R(s) measurements by energy scan method

Status of R(s) measurements by energy scan method

Precise determination of αs from relativistic quarkonium sum rules

Revised and improved value of the QED tenth-order electron anomalous magnetic moment

Contact Info

Product

Resources

About