From the study of the annihilation at rest <(p)over bar p> --> K+/- K-miss(0) pi(-/+)pi(+)pi(-) the production rates of the eta(1440) --> (KKL0)-K-+/- pi(-/+) were obtained for three different hydrogen target densities: liquid, gaseous at NTP and at low pressure (5 mbar). The rate values are: f(eta(1440)) (LH) = (6.0 +/- 0.5) . 10(-4), f(eta(1440)) (NTP) = (2.9 +/- 0.4) . 10(-4) and f(eta(1440)) (5 mbar) = (1.0 +/- 0.2) . 10(-4). From these results, the density dependence of the annihilation fraction from the S-1(0) protonium level can be extracted directly.
Measurement of the eta(1440)->(KKL0)-K-+/-pi(-/+) production rates from (p)over-bar-p annihilation at rest at three different hydrogen target densities
PUDDU, GIOVANNA;USAI, GIANLUCA;
1996-01-01
Abstract
From the study of the annihilation at rest <(p)over bar p> --> K+/- K-miss(0) pi(-/+)pi(+)pi(-) the production rates of the eta(1440) --> (KKL0)-K-+/- pi(-/+) were obtained for three different hydrogen target densities: liquid, gaseous at NTP and at low pressure (5 mbar). The rate values are: f(eta(1440)) (LH) = (6.0 +/- 0.5) . 10(-4), f(eta(1440)) (NTP) = (2.9 +/- 0.4) . 10(-4) and f(eta(1440)) (5 mbar) = (1.0 +/- 0.2) . 10(-4). From these results, the density dependence of the annihilation fraction from the S-1(0) protonium level can be extracted directly.
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