Absence of spin dependence in the final state interaction of the d(pol) p --> 3He eta reaction

Abstract

The deuteron tensor analysing power t_{20} of the d(pol) p --> 3He eta reaction has been measured at the COSY-ANKE facility in small steps in excess energy Q up to Q = 11 MeV. Despite the square of the production amplitude varying by over a factor of five through this range, t_{20} shows little or no energy dependence. This is evidence that the final state interaction causing the energy variation is not influenced by the spin configuration in the entrance channel. The weak angular dependence observed for t_{20} provides useful insight into the amplitude structure near threshold.

arXiv comment5 pages, 4 figures

References in corpus (8)

• Near-Threshold Production of $\eta$-Mesons
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• Measurement of the dp -->3He eta reaction near threshold
• Coherent photoproduction of eta-mesons off 3He - search for eta-mesic nuclei
• Is there an eta-3He quasi--bound state ?
• Determination of Deuteron Beam Polarizations at COSY
• The neutron-proton charge-exchange amplitudes measured in the dp -> ppn reaction
• Spin observables of the reaction pd-3He eta and quasi-bound 3He-eta pole

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• Overview of the software architecture and data flow for the J-PET tomography device
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• Status and Perspectives of the Search for Eta-Mesic Nuclei
• Isospin effects in the exclusive dp -> 3Heπ+π- reaction
• Luminosity determination for the proton-deuteron reaction using pd -> 3He eta channel with WASA-at-COSY detector
• Status of the search for $\eta$-mesic nuclei with particular focus on $\eta$-Helium bound states
• Formation of eta'(958) bound states by (gamma, d) reaction
• Search for Pentaquark Theta+ in Hadronic Reaction at J-PARC
• Populating Low-Spin States in Radioactive Nuclei to Measure Magnetic Moments Using the Transient Field Technique