Search for η-mesic 4He with the WASA-at-COSY detector

P. Adlarson et al. (WASA-at-COSY Collaboration)
Phys. Rev. C 87, 035204 – Published 8 March 2013

Abstract

An exclusive measurement of the excitation function for the dd3Hepπ reaction was performed at the Cooler Synchrotron COSY-Jülich with the WASA-at-COSY detection system. The data were taken during a slow acceleration of the beam from 2.185 to 2.400 GeV/c crossing the kinematic threshold for the η-meson production in the dd4Heη reaction at 2.336 GeV/c. The corresponding excess energy with respect to the 4He-η system varied from 51.4 to 22 MeV. The integrated luminosity in the experiment was determined using the dd3Hen reaction. The shape of the excitation function for the dd3Hepπ reaction was examined. No signal of the 4He-η bound state was observed. An upper limit for the cross section for the bound state formation and decay in the process dd(4Heη)bound3Hepπ was determined on the 90% confidence level and it varies from 20 to 27 nb for the bound state width ranging from 5 to 35 MeV, respectively.

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  • Received 4 January 2013

DOI:https://doi.org/10.1103/PhysRevC.87.035204

©2013 American Physical Society

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Vol. 87, Iss. 3 — March 2013

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