Review of results from SND detector

Ачасов, М. Н.; Aulchenko, V.; Beloborodov, K.; Berdyugin, A. V.; Богданчиков, А. Г.; Bozhenok, A. V.; Bukin, A. D.; Bukin, D.A.; Burdin, S.; Dimova, T.; Drozdetski, Alexei; Дружинин, В. П.; Ganushin, D. I.; Голубев, В. Б.; Ivanchenko, V.N.; Ivanov, P.M.; Korol, A. A.; Koshuba, S. V.; Nesterenko, I.N.; Пахтусова, Е. В.; Polunin, A.A.; Salnikov, A. A.; Serednyakov, S. I.; Shary, V.; Shatunov, Yu. M.; Sidorov, V.; Силагадзе, З. К.; Skrinsky, A.N.; Skripkin, A. G.; Usov, Y.; Vasiljev, A. V.

doi:10.1063/1.1482433

Cited by 160 publications

(359 citation statements)

References 11 publications

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“…In the K + K − channel, new precise data has been published from BaBar [20] as well as from CMD-3 [21] and SND [22]. Thanks to these new data, we have about a factor of 2 improvement in the uncertainty compared to the HLMNT analysis.…”

Section: Update In Input Datamentioning

confidence: 64%

Hadronic Leading Order Contribution to the Muon g-2

Nomura

2018

EPJ Web Conf.

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Abstract. We calculate the Standard Model (SM) prediction for the muon anomalous magnetic moment. By using the latest experimental data for e + e − → hadrons as input to dispersive integrals, we obtain the values of the leading order (LO) and the next-to-leading-order (NLO) hadronic vacuum polarisation contributions as a had, LO VP µ = (693.27 ± 2.46) × 10 −10 and a had, NLO VP µ = (−9.82 ± 0.04) × 10 −10 , respectively. When combined with other contributions to the SM prediction, we obtain a µ (SM) = (11659182.05 ± 3.56) × 10 −10 , which is deviated from the experimental value by ∆a µ ≡ a µ (exp) − a µ (SM) = (27.05 ± 7.26) × 10 −10 . This means that there is a 3.7 σ discrepancy between the experimental value and the SM prediction. We also discuss another closely related quantity, the running QED coupling at the Z-pole, α(M 2 Z ). By using the same e + e − → hadrons data as input, our result for the 5-flavour quark contribution to the running QED coupling at the Z pole is ∆α (5) had (M 2 Z ) = (276.11 ± 1.11) × 10 −4 , from which we obtain α −1 (M 2 Z ) = 128.946 ± 0.015.

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Section: Update In Input Datamentioning

confidence: 64%

Hadronic Leading Order Contribution to the Muon g-2

Nomura

2018

EPJ Web Conf.

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“…The most recent estimates of the dispersion integral for the 2π-channel in the energy range 0.39 < t π < 0.97 GeV 2 which are based on the e + e − experimental results are following a ππ µ = (378.6 ± 5.0) · 10 −10 CMD2 (2003) [12], a ππ µ = (375.6 ± 5.7) · 10 −10 KLOE (2004) [13], a ππ µ = (385.6 ± 5.2) · 10 −10 SND (2005) [5].…”

Section: Phenomenological Estimates Of the Lo Hadronic Contributions mentioning

confidence: 99%

“…4. The ratio of the e + e − → π + π − cross section calculated from the τ − → π − π 0 ν τ decay spectral function measured in [11,9] to the isovector part of the e + e − → π + π − cross section measured by SND (from [5]). The shaded area shows the joint systematic error.…”

Section: Phenomenological Estimates Of the Lo Hadronic Contributions mentioning

confidence: 99%

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Hadronic corrections to muon anomalous magnetic moment within the instanton liquid model

Dorokhov

2007

Nuclear Physics A

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The current status of the muon anomalous magnetic moment problem is briefly presented. The corrections to muon anomaly coming from the effects of hadronic vacuum polarization, Z * γγ * effective vertex and light-by-light scattering are estimated within the instanton model of QCD vacuum. The study of anomalous magnetic moments (AMM) of leptons, a = (g S −2)/2, have played an important role in the development of the standard model (SM). At present accuracy the electron AMM due to small electron mass is sensitive only to quantum electrodynamic (QED) contributions. The theoretical error [1] is dominated by the uncertainty in the input value of the QED coupling α ≡ e 2 /(4π). Thus, the electron AMM provides the best observable for determining the fine coupling constant α −1 = 137.035 998 83(51).(Compared to the electron, the muon AMM has a relative sensitivity to heavier mass scales which is typically proportional to (m µ /m e ) 2 . 1 At present level of accuracy, the muon AMM gives an experimental sensitivity to virtual W and Z gauge bosons as well as a potential sensitivity to other, as yet unobserved, particles in the few hundred GeV/c 2 mass range. The muon AMM is known to an unprecedented accuracy of order of 1 ppm. The * Presented at XLV Cracow School of Theoretical Physics, Zakopane, Poland June 3-12, 2005. 1 The τ -lepton AMM due to τ 's highest mass is the best for searching for manifestation of effects beyond SM, however, τ -lepton is short living particle, so it is not easy to make experiment with good enough accuracy.(1)

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“…Alternatively, CVC relates the properties of the π + π − system produced in e + e − → π + π − to those of the π − π 0 system produced in τ − → π − π 0 ν τ decay; thus, using CVC and correcting for isospin-violating effects, τ data have also been used to obtain a more precise prediction for a had,LO µ [2,4]. Recently, data on e + e − → π + π − has become available from the CMD-2, KLOE, and SND experiments [5,6,7,8]. Data on τ decays is available from the ALEPH [9,10], CLEO [11], and OPAL [12] experiments.…”

Section: Introductionmentioning

confidence: 99%

A High Statistics Study of the Decay τ−→π−π0ντ

Fujikawa

2006

Nuclear Physics B - Proceedings Supplements

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We report a measurement of the branching fraction for τ − → π − π 0 ν τ and the invariant mass spectrum of the resulting π − π 0 system using 72.2 fb −1 of data recorded by the Belle detector at the KEKB e + e − collider. The branching fraction obtained is (25.15 ± 0.04 ± 0.31)%, where the first error is statistical and the second is systematic. The unfolded π − π 0 mass spectrum is used to determine resonance parameters for the ρ(770), ρ ′ (1450), and ρ ′′ (1700) mesons. We also use this spectrum to estimate the hadronic contribution to the anomalous magnetic moment of the muon.

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Review of results from SND detector

Cited by 160 publications

References 11 publications

Hadronic Leading Order Contribution to the Muon g-2

Hadronic Leading Order Contribution to the Muon g-2

Hadronic corrections to muon anomalous magnetic moment within the instanton liquid model

A High Statistics Study of the Decay τ−→π−π0ντ

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