Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2008-09-23
Int.J.Mod.Phys.E18:241-247,2009
Physics
Nuclear Physics
Nuclear Experiment
Talk given at the STORI'08 Conference, Lanzhou, China, September 14-18, 2008, 7 pages, to be published as a special issue of t
Scientific paper
10.1142/S0218301309012252
Excited neutral hyperons Y0* produced in the pp -> p K+ Y0* reaction with a COSY beam momentum of 3.65 MeV/c have masses below 1540 MeV/c2. The ANKE spectrometer allows the simultaneous observation of different decay modes: Y0* -> pion0Sigma0, pion+-Sigma-+, pion0Lambda, K-p by measuring kaons and pions of either charge in coincidence with protons. We have found indications for a neutral excited hyperon resonance Y0* with a mass of (1480 +- 15) MeV/c2 and a width of (60 +- 15) MeV/c2. The cross section for Y0* is of the order of few hundred nanobarns. It can be either a Sigma0 or a Lambda hyperon and on the basis of existing data no conclusion could be made whether it is a three-quark baryon or an exotic state. Missing- and invariant-mass techniques have been used to identify the Lambda(1405) resonance decaying via Sigma0pion0. The cross section for Lambda(1405) production is equal to (4.5 +- 0.9(stat) +- 1.8(syst)) microbarn. The shape and position of the Lambda(1405) distribution are similar to those found from other decay modes, so no support is given to the two-pole model.
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