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• W2138036748 abstract "Abstract Because of the suitability of γN → φN for studying the Pomeron, we systematically investigate the tests for Pomeron factorisation possible in this rather clean reaction, particularly from the more feasible experiment which measures the φ-density-matrix, and also an experiment measuring the recoil nucleon polarisation; the complete set of initial polarisation configurations has been considered. For any two-body parity-conserving process, a simple consequence of factorisation is M -purity which asymptotically corresponds to purely natural or purely unnatural parity in the crossed channel. Factorisation tests, therefore, include M -purity tests, but M -purity does not necessarily imply factorisation. For the φ-decay density-matrix we give all the possible factorisation tests, and show that our tests are exhaustive. A separate measurement of the recoil nucleon polarisation is shown to complement adequately the information obtained from the φ-decay density-matrix in the factorising case. For the φ-density matrix, some of the M -purity tests refer to dominant amplitudes and persist even if s -channel meson-helicity-conservation (which is experimentally true approximately) holds exactly. These tests should be easy to perform. The tests which invoke factorisation more crucially than only M -purity do not persist in that manner; these refer to the helicity nonconserving amplitudes. However, factorisation for such small amplitudes could be advantageously tested here, because of their being masked by the large amplitudes elsewhere. The factorisation tests for the φ-density-matrix can be used to distinguish a pure Regge pole type Pomeron from (a) an M -pure “cut-pole mixture” type Pomeron or an M -impure (hence nonfactorising) “cut-pole mixture” type Pomeron and also (b) a factorising “cut-pole mixture” type Pomeron or a nonfactorising “cut-pole mixture” type Pomeron. Here we have taken departure from relative reality of all amplitudes as the defining criterion for a “cut-pole mixture.” Such tests would require polarised photons and/or targets. Present γN → φN data are not adequate enough to allow firm conclusions about Pomeron factorisation, though they do indicate M -purity for the Pomeron, corresponding to pure natural parity. This is consistent with Pomeron factorisation, but M -purity is only a necessary consequence of factorisation. Better and more γN → φN data are needed to get a more complete picture of Pomeron factorisation." @default.
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• W2138036748 date "1975-08-01" @default.
• W2138036748 modified "2023-09-25" @default.
• W2138036748 title "Pomeron factorisation and the reaction γN → φN" @default.
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• W2138036748 doi "https://doi.org/10.1016/0003-4916(75)90107-4" @default.
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