反质子相互作用的测量和研究进展

发布时间：2018-01-03 05:35

本文关键词：反质子相互作用的测量和研究进展　出处：《中国科学基金》2017年02期 　论文类型：期刊论文

【摘要】：随着对反物质研究的深入,人们需要迫切知道反质子之间的相互作用力是怎样的,是否与质子之间的作用是对称的。对这个作用力的测量,有助于我们理解反物质原子核的形成机制以及对物质-反物质对称性的理解。为此,我们STAR探测器合作组利用相对论重离子加速器中金核-金核碰撞中产生的丰富的反质子,通过反质子-反质子动量关联函数的测量,并扣除了通过其他粒子衰变过来的次级反质子与其他反粒子关联的污染,精确地构建了反质子-反质子关联函数。然后,结合量子多粒子关联理论,定量提取出反质子-反质子的有效力程和散射长度这两个基本作用参数。研究表明,在实验精度内,反质子间的相互作用与正质子保持一致。反质子-反质子之间的强相互作用存在着吸引,它们可以克服由于同号(负电荷)的反质子-反质子之间的库伦排斥而结合成反物质原子核。这项研究首次实现了对反物质间相互作用力的测量,为进一步研究反原子核的形成和属性奠定了基础。同时为电荷共轭-空间反射-时间反演(CPT)对称性的检验提供了一种新的方式,对人类深刻认识物质世界的构成及其运动规律具有重要意义。
[Abstract]:With the in-depth study of anti matter, people urgent need to know the interaction between the antiprotons is how, whether between the proton is symmetric. Measurement of the force that helps us to understand the formation mechanism of anti nuclear material and understanding of the matter antimatter symmetry. Therefore, we STAR detector cooperation group using the relativistic heavy ion accelerator to produce gold - Gold nuclei in nuclear collisions rich antiprotons, by measuring the anti proton antiproton momentum correlation function, and deducted by other particle decay over the secondary antiproton and other anti particle associated pollution, accurately constructed the antiproton the anti proton correlation function. Then, combined with the quantum particle correlation theory, quantitative extracted the two basic parameters of the effective range of the scattering length and anti proton antiproton. Research shows that the precision of the experiment in Degree, interaction between protons and anti protons are consistent. The strong interaction between the anti proton antiproton exists to attract, they can overcome the same number (negative charge) of the anti proton antiproton between Kulun and rejection combined into antimatter atomic nuclei. This is the first study to realize the measurement the anti matter interactions, laid the foundation for further research on formation and properties of atomic nuclei. At the same time as the anti - reflection of space charge conjugation time inversion (CPT) symmetry test provides a new way, is of great significance and profound understanding of the movement rules of human material world.

【作者单位】：中国科学院上海应用物理研究所;
【基金】：国家自然科学基金重点项目(11035009) 国际(地区)合作与交流项目(11220101005) 创新群体项目(11421505) 国家重点基础研究发展计划(2014CB845400)等联合资助
【分类号】：O572.2
【正文快照】： 普遍认为,在我们的物质世界中存在着一种“镜像的世界”,它的个别性质和现实世界正好相反,其他性质则完全相同。从物理学的角度来说,这种“镜像世界”就是反物质。1928年,英国物理学家狄拉克根据相对论方程和量子电动力学方程,推测世界上存在反物质:构成它们的基本粒子与物质

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