A search has been made for exotic states produced in K−d interactions at 5.5 GeV/c. The reactions investigated were: K−d→X−−pp, K−d→Y∗−−π+p and K−d→ M−−Σ+p. Upper limits are set for the production cross sections.

We report on the reactions $A+p\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}+\ensuremath{\cdots}$ and $A+p\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}+{\ensuremath{\pi}}^{\ensuremath{-}}+\ensuremath{\cdots}$, where $A$ is either a 13-GeV/c ${K}^{+}$ or ${K}^{\ensuremath{-}}$ meson or a 7-GeV/c ${\ensuremath{\pi}}^{+}$ meson. We compare the distribution of final-state pions in the proton-fragmentation region with several theoretical predictions concerning limiting behavior and factorization.

The results presented in this paper are obtained from an analysis of bubble-chamber pictures of ${K}^{\ensuremath{-}}d$ interactions at an incident ${K}^{\ensuremath{-}}$ momentum of 5.5 GeV/c. Generally, the quasitwo-body final states are produced peripherally, with a small backward peak occurring in some of the final states. The final states ${\ensuremath{\Sigma}}^{\ensuremath{-}}\ensuremath{\omega}$, ${\ensuremath{\Sigma}}^{\ensuremath{-}}{\ensuremath{\rho}}^{0}$, and ${\ensuremath{\Sigma}}^{\ensuremath{-}}\ensuremath{\varphi}$ appear to be produced primarily by vector-meson exchange. In the final state $\ensuremath{\Lambda}(1520){\ensuremath{\pi}}^{\ensuremath{-}}$ the decay distributions of the $\ensuremath{\Lambda}(1520)$ hyperon are found to be consistent with a vector-exchagne production process with $M2$ coupling at the nucleon vertex. The predictions of the independent-quark model and of other symmetry schemes, namely that the forward cross sections for ${\ensuremath{\Sigma}}^{\ensuremath{-}}{\ensuremath{\rho}}^{0}$, ${\ensuremath{\Sigma}}^{\ensuremath{-}}\ensuremath{\omega}$, ${\ensuremath{\Sigma}}^{\ensuremath{-}}\ensuremath{\varphi}$ production be in the ratios 1: 1: 2, are not inconsistent with our experimental values.

We have carried out a study of ${\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ensuremath{-}}$ scattering using the reaction ${\ensuremath{\pi}}^{\ensuremath{-}}d\ensuremath{\rightarrow}\mathrm{pp}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ensuremath{-}}$ at an incident ${\ensuremath{\pi}}^{\ensuremath{-}}$ momentum of 7 GeV/c. We have extracted the isotopic-spin-2 $\ensuremath{\pi}\ensuremath{\pi}$ phase shifts and elastic cross section using a modified Chew-Low extrapolation. We obtain a value of - 7.7\ifmmode^\circ\else\textdegree\fi{} \ifmmode\pm\else\textpm\fi{} 1.2\ifmmode^\circ\else\textdegree\fi{} for the $s$-wave phase shift at the ${K}^{0}$ mass. Our measurements are in good agreement with current-algebra predictions.

We have performed a search for I = 2 multipion resonances in reactions of the type π−d → pp + x−− at an incident π− momentum of 7 GeV/c. We found no evidence for the existence of resonance-like states in the x−− system, and consequently present upper limits for the production of such resonances in these reactions.

We compare the inclusive reactions K−p→λ + anything, K+p→λ + anything and K+p→λ + anything at 13 GeV/c. We find that the first of these reactions includes significant contributions (⪆30%) from processes other than the annihilation reaction K−→λ + pions, and that this non-annihilation component contributes backward (target-like) and forward (beam-like) λ's whose dynamical origins may be related to those of backward λ's and forward λ's produced in K+p collisions. We suggest that diffractive processes are playing an important role in these reactions.

We confirm at 12.7 $\frac{\mathrm{GeV}}{c}$ a result previously reported at 10 $\frac{\mathrm{GeV}}{c}$, namely the production of a four-pion resonance at \ensuremath{\sim}1630 MeV with a width of \ensuremath{\sim}125 MeV in the reaction ${K}^{+}p\ensuremath{\rightarrow}{K}^{0}p{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$. No corresponding two-pion enhancement is observed in the reaction ${K}^{+}p\ensuremath{\rightarrow}{K}^{0}p{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0}$.

We present single-particle momentum spectra for ${\ensuremath{\pi}}^{\ensuremath{-}}$, ${K}^{0}$, ${\overline{\ensuremath{\Lambda}}}^{0}$, and ${\ensuremath{\Lambda}}^{0}$ particles produced in ${K}^{+}p$ collisions at 12.7 $\frac{\mathrm{GeV}}{c}$, and for ${\ensuremath{\pi}}^{\ensuremath{-}}$ mesons produced in ${\ensuremath{\pi}}^{+}p$ collisions at 7 $\frac{\mathrm{GeV}}{c}$. We examine the correlations between the transverse and longitudinal momentum components of these particles and compare them to those expected as a result of momentum conservation alone. We also investigate the transverse-momentum correlations in two-particle inclusive reactions and discuss the underlying kinematic constraints on these correlations.

We have measured the cross section for production of events in the ${A}_{1}$ mass region for two reactions: (1) ${\ensuremath{\pi}}^{+}p\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\rho}}^{0}p$ and (2) ${\ensuremath{\pi}}^{\ensuremath{-}}n\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\rho}}^{\ensuremath{-}}p$. The results of these experiments, both conducted at an incident pion momentum of \ensuremath{\sim}7 GeV/c, are interpreted within the framework of dual models of inelastic hadron collisions.

The reaction K−d → K−π+π−n ps was studied in a bubble chamber experiment. The cross section was measured to be 1.3 ± 0.2 mb. The final state is dominated by K∗0(890), K∗0(1420) and Δ−(1236) production. Partial cross sections, differential cross sections and decay angular distributions of the K∗0(890) δ−(1236) final state were found to give good agreement with the predictions of Białas and Zalewski obtained from the quark model. The final state K−π+Δ−(1236) is analyzed by use of the Van Hove plot.