Nuclear and hadronic reaction mechanisms producing spin asymmetry

Pramana

Ken-Ichi Kubo1¹ 

[1] School of Science, Tokyo Metropolitan University, 1-1 Minami-osawa, Hachioji, Tokyo 192-0397, Japan$$

关键词: Quark recombination models;    hadrons;    spin polarization.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

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 𝛬 K+ 𝑝 production and we will indicate a possible diagram for resolving it.

【 授权许可】

Unknown