Improved Standard-Model Prediction for 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup><mml:mo stretchy="false">→</mml:mo><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>

Hoferichter, Martin; Hoid, Bai-Long; Kubis, Bastian; Lüdtke, Jan

doi:10.1103/physrevlett.128.172004

Cited by 13 publications

(2 citation statements)

References 111 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We built a form factor representation that smoothly incorporated the various constraints on the pion TFF for the kinematic configuration relevant for π 0 → e + e − [23]. Further details of this TFF representation are relegated to Refs.…”

Section: Form Factor Representationsmentioning

confidence: 99%

“…Recent theoretical advances mainly concern phenomenological estimates [6,[17][18][19] and lattice QCD [20][21][22]. Here, we present the Standard-Model (SM) predictions based on dispersive representations of the TFFs [23,24], profiting from theoretical developments in the context of a dispersive approach to hadronic light-by-light scattering [25][26][27][28][29][30] and hadronic vacuum polarization [31][32][33][34][35] for the anomalous magnetic moment of the muon [36,37].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Comparing phenomenological estimates of dilepton decays of pseudoscalar mesons with lattice QCD

Hoid,

Hoferichter,

Ruiz de Elvira

2023

Proceedings of the 40th International Symposium on Lattice Field Theory — PoS(LATTICE2023)

View full text Add to dashboard Cite

Dilepton decays of pseudoscalar mesons have been drawing particular interest, thanks to their sensitivity to both the QCD dynamics at low energy and also signals beyond the Standard Model. In this context, we shortly review our recent study on an improved Standard-Model prediction for the rare decay π 0 → e + e − , and compare it with the first determination on the lattice that predicted also the π 0 → γγ decay width as a byproduct. In addition, we discuss our recent work on K L → + − decays and its connection to lattice QCD. We comment on the current uncertainty estimates and discuss how they could be improved profiting from future experiments and progress in lattice QCD.

show abstract

Section: Form Factor Representationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparing phenomenological estimates of dilepton decays of pseudoscalar mesons with lattice QCD

Hoid,

Hoferichter,

Ruiz de Elvira

2023

Proceedings of the 40th International Symposium on Lattice Field Theory — PoS(LATTICE2023)

View full text Add to dashboard Cite

show abstract

An updated view on the ATOMKI nuclear anomalies

Barducci

Toni

2023

J. High Energ. Phys.

View full text Add to dashboard Cite

In view of the latest experimental results recently released by the ATOMKI collaboration, we critically re-examine the possible theoretical interpretation of the observed anomalies in terms of a new BSM boson X with mass ~ 17 MeV. To this end we employ a multipole expansion method and give an estimate for the range of values of the nucleon couplings to the new light state in order to match the experimental observations. Our conclusions identify the axial vector state as the most promising candidate, while other spin/parity assignments seems disfavored for a combined explanation. This results is however based on an order of magnitude estimate for the, currently unknown, axial nuclear matrix element of the 12C transition, that needs then to be evaluated before being able to draw a definite conclusion. Intriguingly, an axial vector state can also simultaneously accommodate other experimental anomalies, i.e. the KTeV anomaly in π0 → e+e− decay while being compatible with the conflicting measurements of the anomalous magnetic moment of the electron (g – 2)e and other constraints on the electron couplings of the X boson. The PADME experiment will completely cover the relevant region of the parameter space, thus allowing for a strong test of the existence of the X particle.

show abstract

Improved Standard-Model prediction for KL → ℓ+ℓ−

Hoferichter,

Hoid,

de Elvira

2024

J. High Energ. Phys.

Self Cite

View full text Add to dashboard Cite

We present a comprehensive calculation of the KL → γ∗γ∗ form factor in dispersion theory, using input from the leptonic decays KL → ℓ+ℓ−γ, $${K}_{L}\to {{\ell}}_{1}^{+}{{\ell}}_{1}^{-}{{\ell}}_{2}^{+}{{\ell}}_{2}^{-}$$, the hadronic mode KL → π+π−γ, the normalization KL → γγ, and the matching to asymptotic constraints. As key result we obtain an improved determination of the long-distance contribution to KL → ℓ+ℓ−, leading to the Standard-Model predictions Br[KL → μ+μ−] = $${7.44}_{-0.34}^{+0.41}$$ × 10−9, Br[KL → e+e−] = 8.46(37) × 10−12, and more stringent limits on physics beyond the Standard Model. We provide a detailed breakdown of the current uncertainty, and delineate how future experiments and the interplay with lattice QCD could help further improve the precision.

show abstract

Improved Standard-Model Prediction for π0→e+e−

Cited by 13 publications

References 111 publications

Comparing phenomenological estimates of dilepton decays of pseudoscalar mesons with lattice QCD

Comparing phenomenological estimates of dilepton decays of pseudoscalar mesons with lattice QCD

An updated view on the ATOMKI nuclear anomalies

Improved Standard-Model prediction for KL → ℓ+ℓ−

Contact Info

Product

Resources

About