Production of $Σ^{+} K^{+}$ by $π^{+} - p$ Interactions at 1111, 1206, and $1265 \frac{MeV}{c}$

The reaction

π^{+} + p \to Σ^{+} + K^{+}

has been studied at incident pion momenta of 1111, 1206, and

1265 \frac{MeV}{c}

in the Lawrence Radiation Laboratory 72-in. liquid-hydrogen bubble chamber. The cross section for this process was found to be 144±10 μb at

1111 \frac{MeV}{c}

, 214±15 μb at

1206 \frac{MeV}{c}

, and 278±20 μb at

1265 \frac{MeV}{c}

. The measured value of the mean lifetime of the

Σ^{+}

was (0.76±0.03)×

10^{- 10}

sec. Decay asymmetries gave values of

α^{+} \bar{P}

of -0.16±0.15, 0.05±0.14, and 0.30±0.14, and values of

α^{0} \bar{P}

of 0.50±0.13, 0.37±0.13, and 0.68±0.12 at 1111, 1206, and

1265 \frac{MeV}{c}

, respectively. The angular distribution of the

Σ^{+}

hyperons and

α^{0} P

as a function of the

Σ^{+}

production angle are presented at each of the three momenta, along with the results of partial-wave analyses based on these distributions.

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Production of Σ+K+ by π+−p Interactions at 1111, 1206, and 1265 MeVc