Table 1 Measured ranges and emission angles of particles from the observed double-Λ hypernuclear event

From: Artificial intelligence pioneers the double-strangeness factory

Vertex

Track ID

Range [μm]

θ [∘]

ϕ [∘]

Comment

A

#1

3.5 ± 0.2

100.9  ± 2.3

279.7  ± 2.2

double-Λ hypernucleus

 

#3

757.1 ± 3.0

93.4  ± 1.4

109.1  ± 1.1

 

B

#2

7.0 ± 0.3

124.6 ± 1.1

89.6 ± 1.3

single-Λ hypernucleus

 

#4

36.8 ± 0.2

83.9 ± 1.7

168.9 ± 1.1

 
 

#5

22.4 ± 0.4

145.5 ± 0.8

326.7 ± 1.1

 

C

#6

3.0 ± 0.4

52.3 ± 3.1

234.4 ± 3.8

 
 

#7

7912.8 ± 3.0

54.0 ± 0.3

202.5 ± 0.3

π−

 

#8

1105.5 ± 3.0

127.2 ± 1.0

36.36 ± 0.9

 
  1. Angles are expressed by a zenith angle (θ) with respect to the direction perpendicular to the plate and an azimuthal angle (ϕ). The error arises from the measurement uncertainties due to image-based fitting. The event’s topology is consistent with the sequential weak decay of a double-Λ hypernucleus, where track #1 is identified as a double-Λ hypernucleus and track #2 as a single-Λ hypernucleus. Track #7 is identified as a π− meson based on the observation of its capture star at its endpoint in the emulsion.
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