φ mesons were reconstructed in the K + K − channel in Au-Au collisions at √ s NN = 200 GeV by the PHENIX experiment. φ invariant masses were reconstructed using a high resolution time-of-flight detector and electromagnetic calorimeters for particle identification, in conjunction with the excellent momentum resolution of the PHENIX tracking detectors. A description is given of the techniques for signal extraction and the corrections applied to obtain yields.

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The e-beam-pumped KrF laser "GAR-PUN" produces 100 ns pulses with an output energy of ~100 J and peak power ~1 GW in free-running and injection-controlled narrow-band operation.1 In this paper we describe a design of a multistage KrF laser system with an expected output power of 5-10 GW in nanosecond range.

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