• Nuclear and hadronic reaction mechanisms producing spin asymmetry

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      https://www.ias.ac.in/article/fulltext/pram/057/02-03/0379-0387

    • Keywords

       

      Quark recombination models; hadrons; spin polarization

    • 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.

    • Author Affiliations

       

      Ken-Ichi Kubo1 2

      1. School of Science, Tokyo Metropolitan University, 1-1 Minami-osawa, Hachioji, Tokyo - 192-0397, Japan
      2. Tokyo Metropolitan College of Aeronautical Engineering, 8-52-1 Minami-senju, Arakawa-ku, Tokyo - 116-0003, Japan
    • Dates

       
  • Pramana – Journal of Physics | News

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