Photon radiation in $$e^+e^-\;\rightarrow \;$$ e + e - → hadrons at low energies with carlomat_3.1

Jegerlehner, F.; Kołodziej, Karol

doi:10.1140/epjc/s10052-017-4816-7

Cited by 5 publications

(4 citation statements)

References 93 publications

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“…For the π + π − channel, the full difference between the estimates of a π + π − µ with and without additional FSR corrections is taken as the FSR uncertainty. 4 In the recent work [27], a version of the MC program Carlomat [28] is discussed, which includes real photon radiation in multi-hadron channels. This could be used to further study the FSR effects.…”

Section: Estimating Extra Uncertainty Due To Radiative Correctionsmentioning

confidence: 99%

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Muon g−2 and α(MZ2) : A new data-based analysis

2018

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This work presents a complete re-evaluation of the hadronic vacuum polarisation 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, ∆α had (M 2 Z ), from the combination of e + 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 + e − → hadrons cross section data have been analysed and included, where the new data compilation has yielded the full hadronic R-ratio and its covariance matrix in the energy range m π ≤ √ s ≤ 11.2 GeV. Using these combined data and perturbative QCD above that range results in estimates of the hadronic vacuum polarisation contributions to g − 2 of the muon of a had, LO VP µ = (693.26 ± 2.46) × 10 −10 and a had, NLO VP µ = (−9.82 ± 0.04) × 10 −10 . The new estimate for the Standard Model prediction is found to be a SM µ = (11 659 182.04±3.56)×10 −10 , which is 3.7σ below the current experimental measurement. The prediction for the five-flavour hadronic contribution to the QED coupling at the Z boson mass is ∆α (5) had (M 2 Z ) = (276.11±1.11)×10 −4 , resulting in α −1 (M 2 Z ) = 128.946±0.015. Detailed comparisons with results from similar related works are given. arXiv:1802.02995v2 [hep-ph] 13 Jul 2018 4 Conclusions and future prospects for the muon g − 2 39

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Section: Estimating Extra Uncertainty Due To Radiative Correctionsmentioning

confidence: 99%

“…In the recent work[27], a version of the MC program Carlomat[28] is discussed, which includes real photon radiation in multi-hadron channels. This could be used to further study the FSR effects.…”

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confidence: 99%

Muon g−2 and α(MZ2) : A new data-based analysis

2018

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“…What about RC to other more complicated channels (see e.g. [77,78]). What about disentangling 30 channels and recombining them in the 1 to 2 GeV region (quantum interference, missing parts, double counting issues)?…”

Section: Prospectsmentioning

confidence: 99%

The Muon $g-2$ in Progress

Jegerlehner¹

2018

Acta Phys. Pol. B

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Two next generation muon g − 2 experiments at Fermilab in the US and at J-PARC in Japan have been designed to reach a four times better precision from 0.54 ppm to 0.14 ppm and the challenge for the theory side is to keep up in precision as far as possible. This has triggered a lot of new research activities. The main motivation is the persisting 3 to 4 σ deviation between standard theory and experiment. As Standard Model predictions almost without exception match perfectly all other experimental information, the deviation in one of the most precisely measured quantities in particle physics remains a mystery and inspires the imagination of model builders. Plenty of speculations are aiming to explain what beyond the Standard Model effects could fill what seems to be missing. Here very high precision experiments are competing with searches for new physics at the high energy frontier lead by the Large Hadron Collider at CERN. Actually, the tension is increasing steadily as no new states are found which could accommodate the g µ − 2 discrepancy. With the new muon g − 2 experiments this discrepancy would go up at least to 6 σ, in case the central values do not move, up to 10 σ could be reached if the present theory error could be reduced by a factor of two. Interestingly, the new α from Berkeley by R. H. Parker et al. Science 360, 191 (2018): α −1 (Cs18) = 137.035999046 (27) gives an a e prediction a e = 0.00115965218157(23) such that a exp e − a the e = (−84 ± 36) × 10 −14 shows a −2.3 σ deviation now.

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“…In the recent work [27], a version of the MC program CARLOMAT [28] is discussed, which includes real photon radiation in multihadron channels. This could be used to further study the FSR effects.…”

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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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Photon radiation in $$e^+e^-\;\rightarrow \;$$ e + e - → hadrons at low energies with carlomat_3.1

Cited by 5 publications

References 93 publications

Muon g−2 and α(MZ2) : A new data-based analysis

Muon g−2 and α(MZ2) : A new data-based analysis

The Muon $g-2$ in Progress

Zeroing in on the Muon’s Magnetism

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