Measurement of the 
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Ачасов, М. Н.; Aulchenko, V.; Barnyakov, A.; Beloborodov, K.; Berdyugin, A. V.; Berkaev, D. E.; Богданчиков, А. Г.; Botov, A. A.; Dimova, T.; Голубев, В. Б.; Kardapoltsev, L.; Kasaev, A. S.; Kharlamov, A. G.; Kirpotin, A. N.; Koop, I. A.; Korneev, L.A.; Korol, A. A.; Kovrizhin, D. P.; Koshuba, S. V.; Kupich, A.; Melnikova, N. A.; Martin, K. A.; Obrazovsky, A. E.; Otboev, A.V.; Пахтусова, Е. В.; Пугачев, К. В.; Rogovsky, Yu. A.; Senchenko, A. I.; Serednyakov, S. I.; Силагадзе, З. К.; Shatunov, Yu. M.; Shtol, D.; Shwartz, D. B.; Surin, I. K.; Usov, Y.; Vasiljev, A. V.

doi:10.1103/physrevd.97.032011

Cited by 14 publications

(6 citation statements)

References 19 publications

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“…There are also additional measurements for some specific channels, K + K − π + π − [74] and K S K L π 0 [83]. Finally, cross sections for K + K − η [56] and K S K L η [69] are available from BABAR.…”

Section: • the Multi-hadronic Channelsmentioning

confidence: 99%

The anomalous magnetic moment of the muon in the Standard Model

Aoyama,

Asmussen,

Benayoun

et al. 2020

Preprint

148

296

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We review the present status of the Standard Model calculation of the anomalous magnetic moment of the muon. This is performed in a perturbative expansion in the fine-structure constant α and is broken down into pure QED, electroweak, and hadronic contributions. The pure QED contribution is by far the largest and has been evaluated up to and including O(α 5 ) with negligible numerical uncertainty. The electroweak contribution is suppressed by (m µ /M W ) 2 and only shows up at the level of the seventh significant digit. It has been evaluated up to two loops and is known to better than one percent. Hadronic contributions are the most difficult to calculate and are responsible for almost all of the theoretical uncertainty. The leading hadronic contribution appears at O(α 2 ) and is due to hadronic vacuum polarization, whereas at O(α 3 ) the hadronic light-by-light scattering contribution appears. Given the low characteristic scale of this observable, these contributions have to be calculated with nonperturbative methods, in particular, dispersion relations and the lattice approach to QCD. The largest part of this review is dedicated to a detailed account of recent efforts to improve the calculation of these two contributions with either a data-driven, dispersive approach, or a first-principle, lattice-QCD approach. The final result reads a SM µ = 116 591 810(43) × 10 −11 and is smaller than the Brookhaven measurement by 3.7σ. The experimental uncertainty will soon be reduced by up to a factor four by the new experiment currently running at Fermilab, and also by the future J-PARC experiment. This and the prospects to further reduce the theoretical uncertainty in the near future-which are also discussed here-make this quantity one of the most promising places to look for evidence of new physics.

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Section: • the Multi-hadronic Channelsmentioning

confidence: 99%

The anomalous magnetic moment of the muon in the Standard Model

Aoyama,

Asmussen,

Benayoun

et al. 2020

Preprint

148

296

View full text Add to dashboard Cite

show abstract

“…The purple lines correspond to the channel contribution, whereas the blue and green lines indicate the φ and ρ decomposition, respectively. The data points from [37,[58][59][60][61] are shown in grey.…”

Section: R Kmentioning

confidence: 99%

“…Finally, figure 17 shows the normalized cross section obtained using the fit from [3] for the individually KKπ channels, together with the decomposition into φ (green) and ρ (blue) contributions and the data points extracted from [37,[58][59][60][61]. The sum of these three channels results in the total KKπ channel considered in this work, in contrast to the KKπ used by DarkCast, which consists only of the isoscalar component and agrees with a different set of data [68].…”

Section: Appendix B: Details Of the Hadronic Fit Calculationmentioning

confidence: 99%

A Robust Description of Hadronic Decays in Light Vector Mediator Models

Foguel,

Reimitz,

Funchal

2022

Preprint

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Abelian U (1) gauge group extensions of the Standard Model represent one of the most minimal approaches to solve some of the most urgent particle physics questions and provide a rich phenomenology in various experimental searches. In this work, we focus on baryophilic vector mediator models in the MeV-to-GeV mass range and, in particular, present, for the first time, gauge vector field decays into almost arbitrary hadronic final states. Using only very little theoretical approximations, we rigorously follow the vector meson dominance theory in our calculations. We study the effect on the total and partial decay widths, the branching ratios, and not least on the present (future) experimental limits (reach) on (for) the mass and couplings of light vector particles in different models. We compare our results to current results in the literature. Our calculations are publicly available in a python package to compute various vector particle decay quantities in order to describe leptonic as well as hadronic decay signatures for experimental searches.

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“…13. Since [9], the neutral final state K 0 S K 0 L π 0 has been measured by BABAR [53] and SND [54], completing all modes that contribute to the KKπ final state and removing the reliance on isospin for this channel (other than K 0 S ≅ K 0 L ). Therefore, the KKπ cross section is now calculated using…”

Section: Kk Channelsmentioning

confidence: 99%

“…GeV has three new data additions since[9]. The first of these are the precise BABAR R b data between 10 54. ≤ ffiffi ffi s p ≤ 11.20 GeV [56], which must be deconvoluted of the effects from initial state radiation (ISR) and must have the radiative tails of the resonances from the ϒð1S − 4SÞ states removed (see [57]).…”

mentioning

confidence: 99%

Zeroing in on the Muon’s Magnetism

Roberts

2018

Physics

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This work presents a complete reevaluation of the hadronic vacuum polarization contributions to the anomalous magnetic moment of the muon, a had;VP μ , and the hadronic contributions to the effective QED coupling at the mass of the Z boson, Δα had ðM 2 Z Þ, from the combination of e þ e − → hadrons cross section data. Focus has been placed on the development of a new data combination method, which fully incorporates all correlated statistical and systematic uncertainties in a bias free approach. All available e þ e − → hadrons cross section data have been analyzed and included, where the new data compilation has yielded the full hadronic R-ratio and its covariance matrix in the energy range m π ≤ ffiffi ffi s p ≤ 11.2 GeV. Using these combined data and perturbative QCD above that range results in estimates of the hadronic vacuum polarization contributions to g − 2 of the muon of a had;LO VP μ ¼ ð693.26 AE 2.46Þ × 10 −10 and a had;NLO VP μ ¼ ð−9.82 AE 0.04Þ × 10 −10. The new estimate for the Standard Model prediction is found to be a SM μ ¼ ð11659182.04 AE 3.56Þ × 10 −10 , which is 3.7σ below the current experimental measurement. The prediction for the five-flavor hadronic contribution to the QED coupling at the Z boson mass is Δα ð5Þ had ðM 2 Z Þ ¼ ð276.11 AE 1.11Þ × 10 −4 , resulting in α −1 ðM 2 Z Þ ¼ 128.946 AE 0.015. Detailed comparisons with results from similar related works are given.

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Measurement of the e+e−→KSKL

Abstract: The e þ e − → K S K L π 0 cross section is measured in the center-of-mass energy range ffiffi ffiThe analysis is based on the data sample with an integrated luminosity of 33.5 pb −1 collected with the SND detector at the VEPP-2000 e þ e − collider.

Cited by 14 publications

References 19 publications

The anomalous magnetic moment of the muon in the Standard Model

The anomalous magnetic moment of the muon in the Standard Model

A Robust Description of Hadronic Decays in Light Vector Mediator Models

Zeroing in on the Muon’s Magnetism

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