Measurement of the space-like π⁰ transition form factor

2025/09/09 by BESIII Collaboration, Ablikim, M., Achasov, M. N. +689
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2509.07685

Abstract

Based on 2.93 fb^-1 of e⁺e^- collision data taken with the BESIII detector at a center-of-mass energy of 3.773 GeV, the two-photon fusion process e⁺e^-→ e⁺e^-π⁰ is investigated using a single-tag approach. The differential Born cross section dσ/dQ² and the space-like transition form factor |F(Q²)| of the π⁰ are measured as functions of the squared momentum transfer Q² of the tagged, scattered lepton. The measurement covers the range 0.2 < Q² < 3.5 GeV². The results are consistent with previous measurements, and provide a significant improvement for Q²<2 GeV².

Citations

• Geometric Muon g-2 in the Aether Physics Model (APM): Torsion Closure and a Casimir Sidereal-Drift Test
• The anomalous magnetic moment of the muon in the Standard Model
• Study of BESIII electromagnetic calorimeter performance with radiative lepton pair events
• Coherent Exclusive Exponentiation for Precision Monte Carlo Calculations of Fermion Pair Production / Precision Predictions for (Un)stable W+W- Pairs
• The precision Monte Carlo event generator for two-fermion final states in collisions
• Global aspects of current algebra

Related

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• Measurement of the e⁺e^-→π⁺π^-π⁰ cross section from 0.7 GeV to 3.0 GeV via initial-state radiation
• Measurement of the e⁺e^- → ΛΣ⁰ + c.c. cross sections at √(s) from 2.3094 to 3.0800 GeV
• Measurement of the e⁺e^-→ωπ⁰π⁰ cross section at center-of-mass energies from 2.0 to 3.08 GeV