UnsplitK*'S

Abstract

It is shown that the $K_N\mathrm{}\left(1420\right)\mathrm{}$ and the $K^{*}\mathrm{}\left(890\right)\mathrm{}$ in our 12-GeV/c $K^{+}p$ experiment fit poorly to the double-pole structure reported for the $A_2$ meson. The probability that our data agree with the double-pole hypothesis is less than 1% for the $K_N\mathrm{}\left(1420\right)\mathrm{}$ and completely negligible for the $K^{*}\mathrm{}\left(890\right)\mathrm{}$, although both resonances are fitted well by a Breit-Wigner shape. Our mass resolution is ±7 MeV at the $K_N\mathrm{}\left(1420\right)\mathrm{}$ and ±5 MeV at the $K^{*}\mathrm{}\left(890\right)\mathrm{}$.