Search for theΘ+via theK+p→π+Xreaction with a 1.2 GeV/cK+beam
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Abstract
The ${\ensuremath{\Theta}}^{+}$ was searched for via the ${K}^{+}p\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}X$ reaction using the 1.2 GeV/$c$ ${K}^{+}$ beam at the K6 beam line of the KEK-PS 12 GeV Proton Synchrotron. In the missing mass spectrum of the ${K}^{+}p\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}X$ reaction, no clear peak structure was observed. Therefore a 90% C.L. upper limit of 3.5 \ensuremath{\mu}b/sr was derived for the differential cross section averaged over ${2}^{\ifmmode^\circ\else\textdegree\fi{}}$ to ${22}^{\ifmmode^\circ\else\textdegree\fi{}}$ in the laboratory frame of the ${K}^{+}p\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\Theta}}^{+}$ reaction. This upper limit is much smaller than the theoretical calculation for the $t$-channel process where a ${K}^{0*}$ is exchanged. From the present result, either the $t$-channel process is excluded or the coupling constant of g${}_{K*N\ensuremath{\Theta}}$ is quite small.
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