Journal Article

PreJuSER-18270

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Precision measurement of the eta-mass at COSY-ANKE

Khoukaz, A. ; Goslawski, P. ; ANKE CollaborationFZJ*

2011
IOP Publ. Bristol

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Please use a persistent id in citations: http://hdl.handle.net/2128/25192  doi:10.1088/1742-6596/295/1/012136

Abstract: Measurements on the mass of the -meson performed at different experimental facilities over the last decade have resulted in very precise results but differ by up to 0.5 MeV/c(2) i e, more than eight standard deviations. In order to clarify this situation a new high precision measurement of the dp -> (3)He reaction was conducted at the COoler SYnchrotron - COSY - of the Forschungszentrum Juelich using the ANKE magnetic spectrometer, with the aim to achieve a mass resolution of m < 50 keV/c( 2). In order to measure the meson mass with high accuracy through the dp -> (3)He reaction, both the momentum of the circulating deuteron beam in COSY as well as of the emitted (3)He nucleus has to be determined with high precision. The experimenta lly achieved resolution for the momenta of the (3)He nuclei and the beam deuterons will allow to reach the envisaged -meson mass resolution.

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Experimentelle Hadrondynamik (IKP-2)

Research Program(s):

1. Physik der Hadronen und Kerne (P53)

Appears in the scientific report 2011

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