The measurement ofR ine + e −-annihilation at center-of-mass energies between 7.25 and 10.34 GeV

Blinov, A. E.; Blinov, V. E.; Bondar, A.; Bukin, A. D.; Groshev, V.R.; Klimenko, S.; Onuchin, A. P.; Panin, V.S.; Protopopov, I.Ya.; Shamov, A.G.; Sidorov, V.; Skovpen, Yu. I.; Skrinsky, A.N.; Tayursky, V.A.; Telnov, V. I.; Tikhonov, Yu. A.; Tumaikin, G.M.; Undrus, A.; Воробйов, А.І.; Zhilich, V.

doi:10.1007/s002880050077

Cited by 42 publications

(41 citation statements)

References 22 publications

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“…(2.2) with the α s values obtained in Ref. [8], α (4) s (5 2 GeV 2 ) = 0.235 +0.047 −0.047 and α (5) s (M 2 Z ) = 0.124 +0.011 −0.014 , which was based on earlier measurements by BES [9], MD-1 [10] and CLEO [11]. Adding the correlated and uncorrelated errors of the different experiments in quadrature, the final result α (4) s (9 2 GeV 2 ) = 0.182 +0.022 −0.025 represents the combined information on the strong coupling from these R measurements in the region below the…”

Section: Strong Coupling Constantsupporting

confidence: 66%

Quark masses and the strong coupling from recent $R(s)$ measurements

Steinhauser¹

2008

Proceedings of 8th International Symposium on Radiative Corrections — PoS(RAD COR 2007)

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Section: Strong Coupling Constantsupporting

confidence: 66%

Quark masses and the strong coupling from recent $R(s)$ measurements

Steinhauser¹

2008

Proceedings of 8th International Symposium on Radiative Corrections — PoS(RAD COR 2007)

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“…we refer to [83] and the more recent experimental publications by MD-1 [168], BES [84], CMD-2 [85,169], KLOE [86,170], SND [171], BaBar [172] and [173]. A list of experiments and references till 2003 is given in [167], where the available data are collected.…”

Section: Lowest Order Vacuum Polarization Contributionmentioning

confidence: 99%

The muon g−2

2009

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The muon anomalous magnetic moment is one of the most precisely measured quantities in particle physics. In a recent experiment at Brookhaven it has been measured with a remarkable 14-fold improvement of the previous CERN experiment reaching a precision of 0.54ppm. Since the first results were published, a persisting "discrepancy" between theory and experiment of about 3 standard deviations is observed. It is the largest "established" deviation from the Standard Model seen in a "clean" electroweak observable and thus could be a hint for New Physics to be around the corner. This deviation triggered numerous speculations about the possible origin of the "missing piece" and the increased experimental precision animated a multitude of new theoretical efforts which lead to a substantial improvement of the prediction of the muon anomaly aµ = (gµ − 2)/2. The dominating uncertainty of the prediction, caused by strong interaction effects, could be reduced substantially, due to new hadronic cross section measurements in electron-positron annihilation at low energies. Also the recent electron g − 2 measurement at Harvard contributes substantially to the progress in this field, as it allows for a much more precise determination of the fine structure constant α as well as a cross check of the status of our theoretical understanding.In this report we review the theory of the anomalous magnetic moments of the electron and the muon. After an introduction and a brief description of the principle of the muon g − 2 experiment, we present a review of the status of the theoretical prediction and in particular discuss the role of the hadronic vacuum polarization effects and the hadronic light-by-light scattering correction, including a new evaluation of the dominant pion-exchange contribution. In the end, we find a 3.2 standard deviation discrepancy between experiment and Standard Model prediction. We also present a number of examples of how extensions of the electroweak Standard Model would change the theoretical prediction of the muon anomaly aµ. Perspectives for future developments in experiment and theory are briefly discussed and critically assessed. The muon g − 2 will remain one of the hot topics for further investigations.

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“…Since our analysis [3] in 1995 data from MD1 [22], BES-II [23] and from CMD-2 [24] have lead to a substantial reduction in the hadronic uncertainties on ∆α had and a In the past few years also more data on the purely neutral channels π 0 γ, π 0 π 0 γ, ηγ, π 0 ηγ, η ′ γ, ωπ 0 mainly from SND [28] and CMD-2 [29] have been included. Substantial improvement on the ω and φ resonances, on 4π and 5π channels and a study of ηπ + π − , ωπ + π − [30] contributed to the improvement.…”

Section: A Look At Thementioning

confidence: 99%

Precision measurements of σhadronic for αeff(E) at ILC energies and (g−2)μ

Jegerlehner

2006

Nuclear Physics B - Proceedings Supplements

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A more precise determination of the effective fine structure constant α eff (E) is mandatory for confronting data from future precision experiments with precise SM predictions. Higher precision would help a lot in monitoring new physics by increasing the significance of any deviation from theory. At a future e + e − -collider like the ILC, as at LEP before, α eff (E) plays the role the static zero momentum α = α eff (0) plays in low energy physics. However, by going to the effective version of α one loses about a factor 2 × 10 2 at E = mµ to 10 5 at E = MZ in precision, such that for physics at the gauge boson mass scale and beyond α eff (E) is the least known basic parameter, about a factor 20 less precise than the neutral gauge boson mass MZ and by about a factor 60 less precise than the Fermi constant GF . Examples of precision limitations are α eff (mµ) which limits the theoretical precision of the muon anomalous magnetic moment aµ and α eff (MZ) which limits the accuracy of the prediction of the weak mixing parameter sin 2 Θ f and indirectly the upper bound on the Higgs mass mH. An optimal exploitation of a future linear collider for precision physics requires an improvement of the precision of α eff (E) by something like a factor ten. We discuss a strategy which should be able to reach this goal by appropriate efforts in performing dedicated measurements of σ hadronic in a wide energy range as well as efforts in theory and in particular improving the precision of the QCD parameters αs, mc and m b by lattice QCD and/or more precise determinations of them by experiments and perturbative QCD efforts. Projects at VEPP-2000 (Novosibirsk) and DANAE/KLOE-2 (Frascati) are particularly important for improving on α eff (MZ) as well as α eff (mµ). Using the Adler function as a monitor, one observes that we may obtain the hadronic shift ∆αpQCD where the first term includes the full non-perturbative part with the choice s0 = (2.5 GeV) 2 or larger. In such a determination low-energy machines play a particularly important role in the improvement program. We present an up-to-date analysis including the recent data from KLOE, SND, CMD-2 and BABAR. The analysis based on e + e − -data yields ∆α

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The measurement ofR ine + e −-annihilation at center-of-mass energies between 7.25 and 10.34 GeV

Cited by 42 publications

References 22 publications

Quark masses and the strong coupling from recent $R(s)$ measurements

Quark masses and the strong coupling from recent $R(s)$ measurements

The muon g−2

Precision measurements of σhadronic for αeff(E) at ILC energies and (g−2)μ

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