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

Particle Physics

Publications: Contribution to journal › Article › 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.

Original language	English
Article number	172004
Number of pages	7
Journal	Physical Review Letters
Volume	128
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevLett.128.172004
Publication status	Published - 29 Apr 2022

Austrian Fields of Science 2012

103034 Particle physics

Keywords

DECAY BRANCHING RATIO
FORM-FACTORS
RADIATIVE-CORRECTIONS
EXCLUSIVE PROCESSES
PION
ELECTRON
MUON
ETA

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10.1103/PhysRevLett.128.172004Licence: CC BY 4.0

https://arxiv.org/abs/2105.04563

Cite this

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title = "Improved Standard-Model Prediction for π0→e+e-",

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 - Hoferichter, Martin

AU - Hoid, Bai-Long

AU - Kubis, Bastian

AU - Lüdtke, Jan

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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JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 17

M1 - 172004

ER -

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

Abstract

Austrian Fields of Science 2012

Keywords

Access to Document

Other files and links

Short-Distance Constraints on Hadronic Light-by-Light

Particles and Interactions

Cite this

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

Abstract

Austrian Fields of Science 2012

Keywords

Access to Document

Other files and links

Projects

Short-Distance Constraints on Hadronic Light-by-Light

Particles and Interactions

Cite this

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