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

Frezzotti, R.; Garofalo, Marco; Martinelli, G.; Sachrajda, C.T.; Sanfilippo, Francesco; Simula, Silvano; Tantalo, Nazario

doi:10.1103/physrevd.103.053005

“…The strategies to control the electromagnetic corrections through LQCD studies exist and the first results for the leptonic decays of kaon appeared very recently in refs. [98,99] and the result is compatible with what we used in this paper.…”

Section: Jhep05(2021)175 7 Conclusionsupporting

confidence: 89%

New physics effects in leptonic and semileptonic decays

Bečirević

¹

,

Jaffredo

²

,

Peñuelas

³

et al. 2021

J. High Energ. Phys.

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We discuss the possibilities of extracting the constraints on New Physics by using the current data on the leptonic and semileptonic decays of pseudoscalar mesons. In doing so we use a general low energy Lagrangian that besides the vector and axial operators also includes the (pseudo-)scalar and tensor ones. In obtaining constraints on New Physics couplings, we combine the experimental information concerning several decay modes with the accurate and precise lattice QCD results for the hadronic matrix elements. We propose to study new observables that can be extracted from the angular analysis of the semileptonic decays and discuss their values both in the Standard Model and in some specific scenarios of physics beyond the Standard Model.

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“…Since the corresponding experimental rates are fully inclusive in the energy of the final-state photon, structuredependent contributions to the real photon emission should be included, however, the Chiral Perturbation Theory (ChPT) predictions of Ref. [35] indicate that these structure-dependent contributions are negligible for both kaon and pion decays into muons, an expectation explicitly verified in a recent lattice computation [32], where the structure dependent contributions to Γ 1 were shown to be negligible. The same is not true to the same extent for decays into final-state electrons (see Ref.…”

Section: Numerical Resultsmentioning

confidence: 88%

Future Tests of Parton Distributions

Cruz-Martinez¹,

Forte²,

Nocera³

2021

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The remarkable recent progress in the precision of Lattice QCD computations for several physical quantities relevant for flavour physics has motivated the introduction of isospin-breaking effects, including in particular electromagnetic corrections, to the computations. The isospin-breaking corrections are necessary to fully exploit this improved precision for the determination of the fundamental parameters of the Standard Model, including the CKM matrix elements, and to look for deviations from experimental measurements which might signal the presence of New Physics. Together with colleagues from Rome, we have developed and implemented a framework for including isospin-breaking corrections in leptonic decays P → ν (γ), where P is a pseudoscalar meson and a charged lepton, and the theoretical framework and numerical results are reviewed below. The status of our studies to extend this framework to semileptonic decays P 1 → P 2 ν (γ), where P 1,2 are pseudoscalar mesons, is also presented.

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“…( 35)). The most recent development has been the calculation of the radiative decays P → ν γ for light and charmed mesons, and a phenomenological comparison of our results with those from experimental measurements [30,32].…”

Section: Discussionmentioning

confidence: 99%

Exploring the QCD Phase Diagram with Fluctuations

Koch¹,

Vovchenko²

2021

Acta Phys. Pol. B

0

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The remarkable recent progress in the precision of Lattice QCD computations for several physical quantities relevant for flavour physics has motivated the introduction of isospin-breaking effects, including in particular electromagnetic corrections, to the computations. The isospin-breaking corrections are necessary to fully exploit this improved precision for the determination of the fundamental parameters of the Standard Model, including the CKM matrix elements, and to look for deviations from experimental measurements which might signal the presence of New Physics. Together with colleagues from Rome, we have developed and implemented a framework for including isospin-breaking corrections in leptonic decays P → ν (γ), where P is a pseudoscalar meson and a charged lepton, and the theoretical framework and numerical results are reviewed below. The status of our studies to extend this framework to semileptonic decays P 1 → P 2 ν (γ), where P 1,2 are pseudoscalar mesons, is also presented.

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

Cited by 24 publications

References 23 publications

New physics effects in leptonic and semileptonic decays

New physics effects in leptonic and semileptonic decays

Future Tests of Parton Distributions

Exploring the QCD Phase Diagram with Fluctuations

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