Abstract
We briefly review concept of the quark recombination (QRC) model and a general success of the model. To solve the existing problem, so called anomalous spin observables, in the high energy hyperon spin phenomena, we propose a mechanism; the primarily produced quarks, which are predominantly u and d quarks, act as the leading partons to form the hyperons. Extension of the quark recombination concept with this mechanism is successful in providing a good account of the anomalous spin observables. Another kind of anomaly, the non-zero analysing power and spin depolarization in the Λ hyperon productions, are also discussed and well understood by the presently proposed mechanism. Recently, a further difficulty was observed in an exclusive ΛK + p production and wel will indicate a possible diagram for resolving it.
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Kubo, KI. Nuclear and hadronic reaction mechanisms producing spin asymmetry. Pramana - J Phys 57, 379–387 (2001). https://doi.org/10.1007/s12043-001-0047-3
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DOI: https://doi.org/10.1007/s12043-001-0047-3