Lineshape of the Lambda (1405) hyperon measured through its Sigma+ pi0 decay

Zychor, I.; Schleichert, R.; Keshelashvili, I.; Ströher, H.; Wilkin, C.; Valdau, Yu.; Mikirtychiants, S.; Maeda, Y.; Khoukaz, A.; Koptev, V.; Kacharava, A.; Mersmann, T.; Hartmann, M.; Kleber, V.; Büscher, M.

doi:10.1016/j.physletb.2008.01.002

Journal Article

Lineshape of the Lambda (1405) hyperon measured through its Sigma+ pi0 decay

Zychor, I. ; Büscher, M.FZJ* ; Hartmann, M.FZJ* ; Kacharava, A.FZJ* ; Keshelashvili, I. ; Khoukaz, A. ; Kleber, V. ; Koptev, V. ; Maeda, Y. ; Mersmann, T. ; Mikirtychiants, S. ; Schleichert, R.FZJ* ; Ströher, H.FZJ* ; Valdau, Y. ; Wilkin, C.

2008
North-Holland Publ. Amsterdam

Physics letters / B 660, 167 - 171 (2008) [10.1016/j.physletb.2008.01.002]

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Please use a persistent id in citations: http://hdl.handle.net/2128/10518 doi:10.1016/j.physletb.2008.01.002

Abstract: The pp --> pK(+)Y(0) reaction has been studied for hyperon masses m (Y-0) <= 1540 MeV/c(2) at COSY-Julich by using a 3.65 GeV/c circulating proton beam incident on an internal hydrogen target. Final states comprising two protons, one positively charged kaon and one negatively charged pion have been identified with the ANKE spectrometer. Such configurations are sensitive to the production of the ground state Lambda and Sigma(0) hyperons as well as the Sigma(0)(1385) and Lambda(1405) resonances. Applying invariant- and missing-mass techniques, the two overlapping excited states could be well separated, though with limited statistics. The shape and position of the Lambda(1405) distribution, reconstructed cleanly in the Sigma(0)pi(0) channel, are similar to those found from other decay modes and there is no obvious mass shift. This finding constitutes a challenging test for models that predict Lambda( 1405) to be a two-state resonance. (C) 2008 Elsevier B.V. All rights reserved.

Keyword(s): Lambda(1405): hadronic decay ; p p: interaction ; Juelich COSY PS ; hyperon resonances (auto) ; line shapes (auto)