Measurement of the branching fraction of ψ ( 2 S ) → γ π 0

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doi:10.1103/PhysRevD.110.052011

Measurement of the branching fraction of $ψ (2 S) \to γ π^{0}$

Journal Article · Fri Sep 27 00:00:00 EDT 2024 · Physical Review. D.

DOI:https://doi.org/10.1103/PhysRevD.110.052011· OSTI ID:2473467

Ablikim, M.; Achasov, M. N.; Adlarson, P.; Afedulidis, O.; Ai, X. C.; Aliberti, R.; Amoroso, A.; An, Q.; Bai, Y.; Bakina, O.; Balossino, I.; Ban, Y.; Bao, H. -R.; Batozskaya, V.; Begzsuren, K.; Berger, N.; Berlowski, M.; Bertani, M.; Bettoni, D.; Bianchi, F. more »

Based on $(2712.4 \pm 14.1) \times 10^{6} ψ (2 S)$ events, $7.9 {fb}^{- 1} ψ (3773)$ data, and $0.8 {fb}^{- 1}$ off-resonance data samples collected with the BESIII detector, we measure the branching fraction of $ψ (2 S) \to γ π^{0}$ and $e^{+} e^{-} \to γ π^{0}$ form factor at momentum transfers $Q^{2} \sim 13 {GeV}^{2}$ . The $e^{+} e^{-} \to γ π^{0}$ cross section is fitted with considering the interference between the $ψ (2 S)$ and continuum amplitudes and two solutions are found, $B = 3.74 \times 10^{- 7}$ with $ϕ = 3.93 rad$ and $B = 7.87 \times 10^{- 7}$ with $ϕ = 2.08 rad$ . Here, $B$ is the branching fraction of $ψ (2 S) \to γ π^{0}$ and $ϕ$ is the relative phase angle between the $ψ (2 S)$ and continuum amplitudes. Due to insufficient off-resonance data, the branching fraction $B (ψ (2 S) \to γ π^{0})$ is determined to be in the range $[2.7, 9.7] \times 10^{- 7}$ within 1 standard deviation of the contour region.

Published by the American Physical Society 2024

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Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-05ER41374

OSTI ID:: 2473467

Alternate ID(s):: OSTI ID: 2579550

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 5 Vol. 110; ISSN PRVDAQ; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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