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| Home > Publications database > Spin Dependence of η Meson Production in Proton-Proton Collisions Close to Threshold |
| Home > Publications database > Spin Dependence of η Meson Production in Proton-Proton Collisions Close to Threshold |
| Journal Article | FZJ-2018-05739 |
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2018
APS
College Park, Md.
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Please use a persistent id in citations: http://hdl.handle.net/2128/19784 doi:10.1103/PhysRevLett.120.022002
Abstract: Taking advantage of the high acceptance and axial symmetry of the WASA-at-COSY detector, and the high polarization degree of the proton beam of COSY, the reaction →pp→ppη has been measured close to threshold to explore the analyzing power Ay. The angular distribution of Ay is determined with the precision improved by more than 1 order of magnitude with respect to previous results, allowing a first accurate comparison with theoretical predictions. The determined analyzing power is consistent with zero for an excess energy of Q=15 MeV, signaling s-wave production with no evidence for higher partial waves. At Q=72 MeV the data reveal strong interference of Ps and Pp partial waves and cancellation of (Pp)2 and Ss∗Sd contributions. These results rule out the presently available theoretical predictions for the production mechanism of the η meson.
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