Extraction of kaon formfactors from <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:msup><mml:mi mathvariant="normal">K</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:mo>→</mml:mo><mml:msup><mml:mi>μ</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:mi>ν</mml:mi><mml:mi>γ</mml:mi></mml:math> decay at ISTRA+ setup

Duk, V.; Болотов, В.Н.; Lebedev, Valeri; Khudyakov, A. A.; Makarov, Alexey; Polyarush, A. Yu.; Novikov, V. P.; Akimenko, S.A.; Britvich, G. I.; Filin, A.; Inyakin, A.V.; Korolkov, I.; Leontiev, V. M.; Obraztsov, V.; Polyakov, V.A.; Romanovsky, V.; Tchikilev, O.; Uvarov, V.; Yushchenko, O.

doi:10.1016/j.physletb.2010.10.043

Cited by 16 publications

(23 citation statements)

References 10 publications

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“…The comparison of the experimental results with our predictions, and also with those obtained using ChPT at order O(e 2 p 4 ) based on the vector and axial-vector form factors given in Eq. ( 52) [11] (left panel) and OKA experiments [12] (right panel), compared to our theoretical predictions N th /N pt , evaluated using the vector and axial form factors of Ref. [8] given in Eqs.…”

Section: B the Istra+ And Oka Experimentsmentioning

confidence: 99%

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Comparison of lattice QCD+QED predictions for radiative leptonic decays of light mesons with experimental data

Frezzotti,

Garofalo,

Lubicz

et al. 2020

Preprint

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We present a comparison of existing experimental data for the radiative leptonic decays P → ν γ, where P = K or π and = e or µ, from the KLOE, PIBETA, E787, ISTRA+ and OKA collaborations with theoretical predictions based on the recent non-perturbative determinations of the structure-dependent vector and axial-vector form factors, F V and F A respectively. These were obtained using lattice QCD+QED simulations at order O(α em ) in the electromagnetic coupling. We find good agreement with the KLOE data on K → eν e γ decays from which the form factor F + = F V + F A can be determined. For K → µν µ γ decays we observe differences of up to 3 -4 standard deviations at large photon energies between the theoretical predictions and the data from the E787, ISTRA+ and OKA experiments and similar discrepancies in some kinematical regions with the PIBETA experiment on radiative pion decays. A global study of all the kaon-decay data within the Standard Model results in a poor fit, largely because at large photon energies the KLOE and E787 data cannot be reproduced simultaneously in terms of the same form factor F + . The discrepancy between the theoretical and experimental values of the form factor F − = F V − F A is even more pronounced. These observations motivate future improvements of both the theoretical and experimental determinations of the structure-dependent form factors F + and F − , as well as further theoretical investigations of models of "new physics" which might for example, include possible flavor changing interactions beyond V − A and/or non-universal corrections to the lepton couplings.

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Section: B the Istra+ And Oka Experimentsmentioning

confidence: 99%

“…In Sections IV-VI the experimental data of Refs. [9][10][11][12][13] are briefly described and compared with our theoretical results and with the predictions of Chiral Perturbation Theory (ChPT) at order O(e 2 p 4 ) [14 -18].…”

Section: Introductionmentioning

confidence: 99%

Comparison of lattice QCD+QED predictions for radiative leptonic decays of light mesons with experimental data

Frezzotti,

Garofalo,

Lubicz

et al. 2020

Preprint

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“…Standard kinematic variables are used for the further analysis: x = 2E γ /m K and y = 2E µ /m K , E γ and E µ being photon and muon energies in the kaon rest frame. As in [13], Dalitz-plot will be used for studying signal and background kinematic regions.…”

Section: Event Selectionmentioning

confidence: 99%

“…is taken from our previous analysis [13] in a wide kinematic region, ε(K → µν h ) and ε(K µ2γ ) are efficiencies obtained from Monte-Carlo. BR(K µ2γ ) is taken from theory because…”

Section: U µH | 2 Extraction From X-stripesmentioning

confidence: 99%

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Search for heavy neutrino in K\rightarrow \mu \nu \gamma decay at ISTRA+ setup

Duk¹

2012

Proceedings of the XXth International Workshop High Energy Physics and Quantum Field Theory — PoS(QFTHEP2011)

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QCD and Supercomputers

Martinelli

2023

Springer Proceedings in Physics

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The title of this talk should rather have been Lattice QCD and Supercomputers. I will introduce Lattice QCD as the fundamental tool to predict (postdict) the hadron spectrum and most of the matrix elements relevant for hadronic physics in the non-perturbative regime. Lattice calculations are used to study the dynamics of QCD at large temperature or chemical potential, the anomalous magnetic moment of the muon, $$g-$$ g - 2, the nucleon structure functions, the meson scattering amplitudes at low and intermediate energies and, last but not least, the weak matrix elements relevant in flavour physics and CP violation. In this presentation only some example particularly illustrative of the present sophistication and accuracy of lattice QCD calculations will be discussed in some detail.

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Extraction of kaon formfactors from K−→μ−νγ decay at ISTRA+ setup

Cited by 16 publications

References 10 publications

Comparison of lattice QCD+QED predictions for radiative leptonic decays of light mesons with experimental data

Comparison of lattice QCD+QED predictions for radiative leptonic decays of light mesons with experimental data

Search for heavy neutrino in K\rightarrow \mu \nu \gamma decay at ISTRA+ setup

QCD and Supercomputers

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