Spin observables of the reaction pd-3He eta and quasi-bound 3He-eta pole - Nuclear TheoryReport as inadecuate




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Abstract: A formalism for spin observables of the reaction$pd\to ~^3He\eta$ is derived in a model independent way.The general case with a full set of six independent spin amplitudes isstudied. Furthermore, approximations by five and four spin amplitudes areinvestigated in the near threshold region. This region is of great interest tosearch for a quasi-bound $^3He-\eta$ state, in particular, by measurement ofenergy dependence of relative phases of s- and p-wave amplitudes. Completepolarization experiments, allowing determination of spin amplitudes, areanalyzed. It is shown that measurement of only analyzing powers and spincorrelation coefficients hardly allows one to separate the s- and p-waveamplitudes, but additional measurement of polarization transfer coefficientssimplifies this problem. Specific observables, given by products of one s- andone p-wave amplitudes, are found. Measurement of these observables will providenew independent information on the $^3He-\eta$ pole position.



Author: Yu.N. Uzikov JINR, Dubna, Russia

Source: https://arxiv.org/







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