M. Clajus

K{sup -}p{yields}{pi}{sup 0}{pi}{sup 0}{sigma}{sup 0} at p{sub K{sup -}}=514-750 MeV/c and comparison with other {pi}{sup 0}{pi}{sup 0} production

Reaction K{sup -}p{yields}{pi}{sup 0}{pi}{sup 0}{sigma}{sup 0} was measured with the Crystal Ball multiphoton spectrometer at eight K{sup -} momenta from 514 to 750 MeV/c. Dynamics and the energy dependence of the reaction are shown by Dalitz plots, invariant mass spectra, production angular distributions, and total cross sections. The dipion invariant-mass spectra for K{sup -}p{yields}{pi}{sup 0}{pi}{sup 0}{sigma}{sup 0} show an enhancement in the low mass region; the opposite is the case for the K{sup -}p{yields}{pi}{sup 0}{pi}{sup 0}{lambda} and {pi}{sup -}p{yields}{pi}{sup 0}{pi}{sup 0}n reactions. There is no direct evidence for a f{sub 0}(600)-meson contribution to {pi}{sup 0}{pi}{sup 0} production. Everywhere {sigma}{sub t}(K{sup -}p{yields}{pi}{sup 0}{pi}{sup 0}{sigma}{sup 0})<<{sigma}{sub t}(K{sup -}p{yields}{pi}{sup 0}{pi}{sup 0}{lambda})

Reaction K- p ---> pi0 pi0 lambda from pK- = 514-MeV/c to 750-MeV/c

Reaction

Measurement of k-p → ηΛ near threshold

{K}^{\ensuremath{-}}p\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}\ensuremath{\Lambda}

Measurement of the total and differential cross sections for the reaction π−p → ηn with the Crystal Ball detector

was measured at eight incident

Does the Σ(1580)32− resonance exist?

{K}^{\ensuremath{-}}

Does the Sigma(1580)3/2- resonance exist?

momenta between 514 and

Measurement of the branching ratio for {eta}{yields}{pi}{sup 0}{gamma}{gamma} decay

750\phantom{\rule{0.3em}{0ex}}\text{MeV}∕c

Measurement of the branching ratio for eta--->pi**0gammagamma decay

using the Crystal Ball multiphoton spectrometer. The reaction dynamics are displayed in total cross sections, Dalitz plots, invariant-mass spectra, production angular distributions, and the

Measurement of the branching ratio forη→π0γγdecay

\ensuremath{\Lambda}

Measurement of K{sup -}p {r_arrow}{eta}{Lambda} near threshold.

polarization. The