decay

width_calc [GeV]

width_obs [GeV]

rel. Δwidth

I_i

I_f

l = ΔI

G

x

m_X

G formula

${\pi }^0\to \gamma \gamma$

7.86 × 10⁻⁹

7.84 × 10⁻⁹

0.0687023

1

2

3

0.00632905

0.

23.8527

$G=2\pi \alpha g_{ph}\text{'}$

$\eta \to \gamma \gamma$

6.4 × 10⁻⁷

6.55 × 10⁻⁷

0.21875

1

2

3

0.00707609

0.

21.334

$G=2\pi \alpha g_{ph}\text{'}\sqrt{5/4}$

${\eta }^{\prime }\to \gamma \gamma$

4.57 × 10⁻⁶

4.67 × 10⁻⁶

0.0547046

1

2

3

0.0081707

0.

18.476

$G=2\pi \alpha g_{ph}\text{'}\sqrt{5/3}$

$\Lambda \to n\gamma$

3.88647 × 10⁻¹⁸

3.96 × 10⁻¹⁸

0.0368098

1/2

3/2

2

1.82761 × 10⁻⁸

0.842126

164.32

$G=g_{ph}\sqrt{7/2}$

${\Sigma }^{+}\to p\gamma$

1.03154 × 10⁻¹⁷

9.81 × 10⁻¹⁸

0.0487805

1/2

3/2

2

1.9538 × 10⁻⁸

0.78886

161.01

$G=2g_{ph}$

${\Xi }^0\to \Lambda \gamma$

2.33984 × 10⁻¹⁸

2.34 × 10⁻¹⁸

0.150943

1/2

3/2

2

9.769 × 10⁻⁹

0.848531

224.40

$G=g_{ph}$

${\Xi }^0\to {\Sigma }^0\gamma$

7.50752 × 10⁻¹⁸

7.87 × 10⁻¹⁸

0.120787

1/2

3/2

2

2.76309 × 10⁻⁸

0.907017

131.51

$G=g_{ph}\sqrt{8}$

${\Xi }^{-}\to {\Sigma }^{-}\gamma$

4.91693 × 10⁻¹⁹

4.99 × 10⁻¹⁹

0.179688

1/2

3/2

2

6.90773 × 10⁻⁹

0.905992

263.09

$G=g_{ph}/\sqrt{2}$