Inclusive K(S);(0)K(S);(0) resonance production in ep collisions at HERA

Inclusive K_{S};{0}K_{S};{0} production in ep collisions at the DESY ep collider HERA was studied with the ZEUS detector using an integrated luminosity of 0.5 fb;{-1}. Enhancements in the mass spectrum were observed and are attributed to the production of f_{2}(1270)/a_{2};{0}(1320), f_{2};{'}(1525) and f_{0}(1710). Masses and widths were obtained using a fit which takes into account theoretical predictions based on SU(3) symmetry arguments, and are consistent with the Particle Data Group values. The f_{0}(1710) state, which has a mass consistent with a glueball candidate, was observed with a statistical significance of 5 standard deviations. However, if this state is the same as that seen in gammagamma-->K_{S};{0}K_{S};{0}, it is unlikely to be a pure glueball state.

Oncocytoma of the lung

A tumor diagnosed as an oncocytoma was removed from the lower right lung of a 22-year-old patient. Specimens from the formalin fixed tumor were studied by light microscopy and by electron microscopy. Large numbers of mitochondria were observed in all the tumor cells at the ultrastructural level despite many artefacts due to fixation. The presence of two tumor cell types "typical" oncocytes and "condensed" oncocytes were demonstrated by electron microscopy. This appears to be the second pulmonary oncocytoma in which mitochondrial hyperplaxia has been demonstrated. The tumor was similar to previously reported cases of salivary gland oncocytomas.