Measurement of R uds and R between 3.12 and 3.72 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.; Borodenko, A.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.; Petrov, Vladimir; Pivovarov, S.G.; Piminov, P.; 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.2015.12.059

Cited by 36 publications

(32 citation statements)

References 32 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: 63%

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: 63%

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: 95%

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

“…Recent data sets collected are: [23,24], and e Above 2 GeV fairly accurate BES-II data [28] are available. Recently, a new inclusive determination of R γ (s) in the range 1.84 to 3.72 GeV has been obtained with the KEDR detector at Novosibirsk [29] (see figure 5). A big step in improving low energy cross section measurements has been …”

mentioning

confidence: 99%

Muon g – 2 theory: The hadronic part

2018

View full text Add to dashboard Cite

Abstract. I present a status report of the hadronic vacuum polarization effects for the muon g−2, to be considered as an update of [1]. The update concerns recent new inclusive R measurements from KEDR in the energy range 1.84 to 3.72 GeV. For the leading order contributions I find a 1 Overview: hadronic effects in g − 2.This review of the hadronic vacuum polarization (HVP) contributions to the muon g − 2 is to be considered as a complement to the theory reviews by Marc Knecht and Massimiliano Procura which focus on the hadronic light-by-light (HLbL) part and the reviews on hadronic cross sections by Graziano Venanzoni, Simon Eidelman and Achim Denig in these Proceedings.The present experimental muon g − 2 result from Brookhaven (BNL) a [2] soon will be improved by the new muon g − 2 experiments at Fermilab and J-PARC. The Fermilab experiment will be able to reduce the error by a factor 4, the J-PARC experiment will provide an important cross check with a very different technique [3]. It means that the new muon g − 2 experiments are expected to establish a possible new physics contribution at the level ∆a µ = a exp µ − a the µ = 6.7 σ provided theory remains as it is today and the central value does not move significantly. If we achieve a reduction of the hadronic uncertainty by factor 2 we would arrive at ∆a µ = 11.6 σ. That's what we hope to achieve. , which is representing a +0.90 ±0.25 ppm effect.

show abstract

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

Cited by 36 publications

References 32 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

Muon g – 2 theory: The hadronic part

Contact Info

Product

Resources

About