Phys. Rev. C 68, 061601 (2003) [5 pages]

η-π mixing close to the η -helium threshold

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Abstract

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A. M. Green ^*
Department of Physical Sciences and Helsinki Institute of Physics, P.O. Box 64, FIN–00014 University of Helsinki, Finland

S. Wycech ^†
Soltan Institute for Nuclear Studies, Warsaw, Poland

Rapid Communication Received 25 August 2003; published 22 December 2003

A K -matrix formalism is used to relate the amplitudes for the three reactions pd→³Heη , π⁺ ³H→³Heη , and pd→³Hπ⁺ . Free parameters are fitted to the available experimental data and an extrapolation below the η³He threshold is made to see the origin of the η³He threshold enhancement. The existence of a virtual—and not a quasibound—state finds support in the data. The K matrix permits a discussion of η-π mixing. A mixing parameter of 0.010(5) , i.e., a mixing angle θ=0.6(3)° , is extracted from a best fit to the very recent pd→³Heπ⁰ reaction data.

URL: http://link.aps.org/abstract/PRC/v68/e061601
DOI: 10.1103/PhysRevC.68.061601
PACS: 13.75.−n, 25.80.−e, 25.40.Ve

^* Email address: anthony.green@helsinki.fi
^† Email address: wycech@fuw.edu.pl

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Phys. Rev. C 68, 061601 (2003) [5 pages]

η-π mixing close to the η -helium threshold

PRL Celebrates 50 Years