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非粒子交换导致的长程作用力


□ 廖 益

  摘 要最近,Georgi建议了一种客体——非粒子,它不存在色散关系的约束(因而不是粒子),却受所谓的标度量纲控制.文章作者指出,它与粒子相互作用会导致粒子间新奇的长程力.这种力与人们熟知的长程力完全不同,在人们已设想到的任何新物理中也没有这样的长程力.如果在未来的精确测量中发现了这种力,这将明确地指向非粒子物理,从而对粒子物理学的基本概念产生重要影响.另方面,利用现有的精确观测的电子自旋-自旋长程作用,文章作者得到了对电子与非粒子相互作用的很强限制.对该领域的研究前景,文章中也作了简短的展望.
  关键词非粒子,长程力,标度不变性
  
  Long\|range force from unparticle exchange
  LIAO Yi
  (Department of Physics, Nankai University, Tianjin300071, China)
  
  AbstractUnparticles as recently suggested by Georgi are identities that are not constrained by dispersion relations (and are thus not particles) but are governed by their scaling dimension. We show that their coupling to particles results in novel long\|range forces between particles that are totally different from known ones or those arising in any other new physics contemplated so far. If such forces were discovered in future precision measurements it would point to unparticle physics unambiguously, and thus impact significantly the basic concepts of particle physics. On the other hand, we use the existing precisely measured long\|range spin\|spin interaction of electrons to set stringent bounds on the unparticle coupling to the electron. We also mention briefly the prospects for research in this field. ......
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