Production of the 1385-MeV ${({Y_{1}}^{*})}^{0}$ in 1.5-BeV/c $π^{-} p$ Interactions

The reaction 1.508-BeV/c

π^{-} + p \to K^{0} + Λ + π^{0}

has been studied in a spark chamber experiment; 127 events of this type were obtained. The reaction is dominated by production of the

{({Y_{1}}^{*})}^{0}

, with parameters

M_{0} = 1381 \pm 4

MeV,

Γ = 30 \pm 9

MeV. The differential cross section for production of the

{({Y_{1}}^{*})}^{0}

(6.3 \pm 0.9) \times [1 + (0.15 \pm 0.27) cos θ - (0.35 \pm 0.38) {cos}^{2} θ]

μb/sr; the total production cross section is (70±11) μb. Decay distributions of this resonance, assuming

S

and

P

waves in the production, are consistent with spin

\frac{3}{2}

, favoring it over spin

\frac{5}{2}

with a likelihood ratio of

\frac{10}{1}

This publication has 28 references indexed in Scilit:

Production of the 1385-MeV (Y1*)0 in 1.5-BeV/c π−p Interactions