Inclusive Features ofπ+Spectra in Coherentp¯dInteractions at 5.55 GeV/c

We present an analysis of the coherently produced single and double inclusive $\overline{p}d\to {\pi }^{+}X$ and $\overline{p}d\to {\pi }^{+}\mathrm{dX}$ processes obtained from a 150 000-photograph $\overline{p}d$ exposure at 5.55 GeV/c. Here $X$, which denotes anything, contains for the $\overline{p}d\to {\pi }^{+}X$ reaction at least a deuteron or its dissociated $\mathrm{pn}$ state produced by a final-state interaction. A representative sample of events was obtained by using only fitted channels. A good parameterization of the single inclusive process is obtained using a thermodynamical-type function. A comparison of our data with other inclusive processes is carried out. As we use only fitted channels for the present analysis, we are able to observe a prominent $d^{*}$ enhancement in the final state. The presence of this enhancement is used to define a short-range correlation length in the rapidity space for the $\overline{p}d\to {\pi }^{+}X$ and $\overline{p}d\to {\pi }^{+}\mathrm{dX}$ reactions. For the $\overline{p}d\to {\pi }^{+}\mathrm{dX}$ process we define some correlation parameters between the outgoing ${\pi }^{+}$ and $d$, and compare these parameters with peripheral phase-space predictions.