Production of theN*(1470)inpd→psppπ−at 7.0 GeV/c

Abstract

We see a significant peak ($M=1.446\mathrm{}\pm 0.011$ GeV, $\Gamma =198\mathrm{}\pm 40$ MeV), consistent with a $I=\frac{1}{2}$, $J=\frac{1}{2}$ state, in the $p{\pi }^{-}$ mass distribution of the reaction $\mathrm{pd}\to p_s\mathrm{pp}{\pi }^{-}$ at 7.0 GeV/c. We interpret it as the $N^{*}\mathrm{}\left(1470\right)\mathrm{}$ produced in the reaction $\mathrm{pn}\to p{N}^{*0\mathrm{}}\mathrm{}\left(1470\right)\mathrm{}$ [$N^{*0\mathrm{}}\mathrm{}\left(1470\right)\mathrm{}\to p{\pi }^{-}$] in deuterium. The production of the $N^{*}\mathrm{}\left(1470\right)\mathrm{}$ is strongly peripheral and favors $I=0\mathrm{}$ exchange. A discussion of this peak in terms of a double-Regge-pole exchange mechanism is presented.