Precision Measurement of the Decay <math display="inline"><mrow><msup><mrow><mi mathvariant="normal">Σ</mi></mrow><mrow><mo>+</mo></mrow></msup><mo stretchy="false">→</mo><mi>p</mi><mi>γ</mi></mrow></math> in the Process <math display="inline"><mrow><mi>J</mi><mo>/</mo><mi>ψ</mi><mo stretchy="false">→</mo><msup><mrow><mi mathvariant="normal">Σ</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mover accent="true"><mrow><mi mathvariant="normal">Σ</mi></mrow><mrow><mo stretchy="false">¯</mo></mrow></mover></mrow><mrow><mo>-</mo></mrow></msup></mrow></math>

Ablikim, M.; Achasov, M.N.; Adlarson, P.; Aliberti, R.; Amoroso, A.; An, M.R.; An, Q.; Bai, Y.; Bakina, O.; Balossino, I.

doi:10.1103/PhysRevLett.130.211901

Precision Measurement of the Decay $Σ^{+} \to p γ$ in the Process $J / ψ \to Σ^{+} {\bar{Σ}}^{-}$

BESIII

Collaboration

Feb 27, 2023

9 pages

Published in:

Phys.Rev.Lett. 130 (2023) 21, 211901

Published: May 22, 2023

e-Print:

2302.13568 [hep-ex]

DOI:

10.1103/PhysRevLett.130.211901 (publication)

PDG:

{{\mathit \Sigma}^{+}}

\rightarrow

{{\mathit p}}{{\mathit \gamma}}

Experiments:

BEPC-BES-III

View in:

ADS Abstract Service

pdf

reference search16 citations

Citations per year

Abstract: (APS)

Using

(10 087 \pm 44) \times 10^{6}

J / ψ

events collected with the BESIII detector, the radiative hyperon decay

Σ^{+} \to p γ

is studied at an electron-positron collider experiment for the first time. The absolute branching fraction is measured to be

(0.996 \pm 0.02 1_{stat} \pm 0.01 8_{syst}) \times 10^{- 3}

, which is lower than its world average value by 4.2 standard deviations. Its decay asymmetry parameter is determined to be

- 0.652 \pm 0.05 6_{stat} \pm 0.02 0_{syst}

. The branching fraction and decay asymmetry parameter are the most precise to date, and the accuracies are improved by 78% and 34%, respectively.

Note:

9 pages, 4 figures, 1 table

electron positron: annihilation
electron positron: colliding beams
J/psi(3100): hadronic decay
Sigma: pair production
Sigma: radiative decay
decay: asymmetry: measured
Sigma: branching ratio
branching ratio: measured
hyperon: radiative decay
precision measurement

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Precision Measurement of the Decay Σ+→pγ in the Process J/ψ→Σ+Σ¯-

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Precision Measurement of the Decay $Σ^{+} \to p γ$ in the Process $J / ψ \to Σ^{+} {\bar{Σ}}^{-}$