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

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

doi:10.1103/PhysRevLett.128.172004

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

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

Teilchenphysik

Veröffentlichungen: Beitrag in Fachzeitschrift › Artikel › Peer Reviewed

Abstract

We present an improved standard-model (SM) prediction for the dilepton decay of the neutral pion. The loop amplitude is determined by the pion transition form factor for p0**, for which we employ a dispersive representation that incorporates both spacelike and timelike data as well as short-distance constraints. The resulting SM branching fraction, Br[p0?e+e-]=6.25(3)×10-8, sharpens constraints on physics beyond the SM, including pseudoscalar and axial-vector mediators.

Originalsprache	Englisch
Aufsatznummer	172004
Seitenumfang	7
Fachzeitschrift	Physical Review Letters
Jahrgang	128
Ausgabenummer	17
DOIs	https://doi.org/10.1103/PhysRevLett.128.172004
Publikationsstatus	Veröffentlicht - 29 Apr. 2022

Fördermittel

We thank Tom\u00E1\u0161 Husek, Karol Kampf, and Ji\u0159\u00ED Novotn\u00FD for valuable communication regarding Refs. . Financial support by the SNSF (Project No. PCEFP2_181117) and the DFG through the funds provided to the Sino-German Collaborative Research Center TRR110 \u201CSymmetries and the Emergence of Structure in QCD\u201D (DFG Project-ID 196253076\u2013TRR 110) is gratefully acknowledged. J.\u2009L. is supported by the FWF-DACH Grant No. I 3845-N27 and by the FWF doctoral program Particles and Interactions, Project No. W 1252-N27.

ÖFOS 2012

103034 Teilchenphysik

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10.1103/PhysRevLett.128.172004Lizenz: CC BY 4.0

https://arxiv.org/abs/2105.04563

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Short-Distance Bedingungen im hadronischen Light-by-Light
Procura, M. (Projektleiter*in)
1/12/18 → 30/11/22
Projekt: Forschungsförderung
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Projekt: Forschungsförderung

Zitationsweisen

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abstract = "We present an improved standard-model (SM) prediction for the dilepton decay of the neutral pion. The loop amplitude is determined by the pion transition form factor for p0**, for which we employ a dispersive representation that incorporates both spacelike and timelike data as well as short-distance constraints. The resulting SM branching fraction, Br[p0?e+e-]=6.25(3)×10-8, sharpens constraints on physics beyond the SM, including pseudoscalar and axial-vector mediators.",

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AU - Hoid, Bai-Long

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PY - 2022/4/29

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AB - We present an improved standard-model (SM) prediction for the dilepton decay of the neutral pion. The loop amplitude is determined by the pion transition form factor for p0**, for which we employ a dispersive representation that incorporates both spacelike and timelike data as well as short-distance constraints. The resulting SM branching fraction, Br[p0?e+e-]=6.25(3)×10-8, sharpens constraints on physics beyond the SM, including pseudoscalar and axial-vector mediators.

KW - DECAY BRANCHING RATIO

KW - FORM-FACTORS

KW - RADIATIVE-CORRECTIONS

KW - EXCLUSIVE PROCESSES

KW - PION

KW - ELECTRON

KW - MUON

KW - ETA

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DO - 10.1103/PhysRevLett.128.172004

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JO - Physical Review Letters

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IS - 17

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ER -

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

Abstract

Fördermittel

ÖFOS 2012

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Andere Dateien und Links

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Projekte

Short-Distance Bedingungen im hadronischen Light-by-Light

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Zitationsweisen

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