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【学术预告】超级Z工厂及其上的实验物理

行健楼437

题目:超级Z工厂及其上的实验物理

报告人:张肇西,中科院院士,中国科学院理论物理研究所

报告时间:2019年6月17日下午3:30-4:30

报告地点:行健楼437

http://www.itp.cas.cn/rcjy/ys/200907/W020120109421211367286.jpg

报告摘要:标准模型中的唯一中性弱规范粒子,Z-玻色子,它能够在正负电子对撞机中共振产生(对撞质心系能量为91GeV);专门建造正负电子对撞机运行在共振能量处,大量产生Z-玻色子,与配套的灵敏探测器构成的大型实验装置平台称为Z-玻色子工厂;利用现代的加速器、对撞机和探测器技术,Z-玻色子工厂的对撞亮度有希翼可达10^36厘米^-2秒^-1,并能做到精确探测所产生的事例,这样最高亮度的、区别于世界上曾有过的Z-玻色子工厂,称为超级Z-玻色子工厂;在超级Z-玻色子工厂上,全面精确研究Z-玻色子产生及其衰变、衰变的次级粒子的性质,寻找稀有事例等,特别是从产生到衰变的次级联合起来研究它们,能够最严格地检验粒子物理标准模型和最灵敏地发现标准模型之外新物理的线索;超级Z-玻色子工厂还是研究韬轻子物理,重味物理,重味、双重味强子物理,量子色动力学(QCD)的强子化、碎裂函数的测定等方面的研究的实验平台,有无可替代的优势;最后指出为满足粒子物理的发展需要,世界上至少需要建造一个超级Z-玻色子工厂

报告人概况:张肇西,著名粒子物理学家,中国科学院院士、中国科学院理论物理研究所研究员。主要从事粒子物理理论研究,以Bc介子的研究闻名于世界。基于微扰量子色动力学独立发表的关于J/psi粒子强产生的研究论文原创性地提出了直接强产生J/psi粒子的‘色单态机制’,成为该机制的代表性论文常被引用。理论上正确地计算了b夸克到Bc介子的碎裂函数,强产生Bc介子基态和激发态的横动量分布和总截面,计算了Bc介子的主要衰变道的宽度及Bc介子的寿命等,明确预言了实验发现Bc介子的途径和可能性。1998年美国TEVATRON的实验率先如理论预言发现了Bc介子。所撰写和及时升级的蒙特卡罗强产生“双重味”粒子的理论产生子BCVEGPY和GENXICC,对实验研究十分有用,已被多个实验组采用。注重结合我国中、高能物理的实验,开展了相关的理论研究并为我国的实验提出过有价值的建议。曾获中国科学院自然科学一等奖、中国物理学会吴有训物理奖等。

Title: Super Z Factory and Experimental Physics on It

Speaker: Zhao-xi Zhang, Academician of the Chinese Academy of Sciences, Institute of Theoretical Physics, Chinese Academy of Sciences

Reporting time: 3:30-4:30 pm,June 17, 2019

Reporting location: Xingjian Building 437

Summary of the report:

The only neutral weak gauge particle in the standard model, the Z-Boson, which is capable of resonating in a positive-negative electron collider (the center-of-momentum of the collision is 91 GeV); a dedication to build electron-positron collider running at the resonance energy, a large number of Z-Bosons are produced, together with a large experimental device platform consisting of a matched sensitive detector to be called a Z-Boson sub-factor; using modern accelerators, colliders and detector technology, the colliding brightness of theZ-boson factory is expected to reach 10^36 cm^-2 s^-1 and it can accurately detect the occurrence of the case, so that the highest brightness is different from the Z-boson factory which has been seen in the world. The boson factory is known as the Super Z-Boson Factory which comprehensively and accurately studies the properties of Z-Boson generation, its decaying and decaying secondary particles to look for rare cases, etc. In particular, researching them from the generation to the decay can rigorously test of the particle physics standard model and find the most sensitive discovery of new physics outside the standard model; Super Z-Boson sub-factor is still an experimental platform to study tau lepton physics, heavy flavor physics, heavy flavor and double heavy flavor hadron physics, the hadronization of quantum chromodynamics (QCD), the determination of the fragmentation function, etc. It has irreplaceable advantages. Finally pointing out that in order to meet the development needs of particle physics, the world at least one super Z-Boson Factory needs to be built.

Reporter Profile:

Zhao-xi Zhang, a famous particle physicist, is an academician of the Chinese Academy of Sciences and researcher of the Institute of Theoretical Physics of the Chinese Academy of Sciences. Mainly engaged in particle physics theory research, he is known as Bc-meson research in the world. He published a research paper on the strong generation of J/psi particles based on perturbative quantum chromodynamics and originally proposed a 'color singlet mechanism' that directly produces J/psi particles, which is often cited as a representative paper for this mechanism. Theoretically, he calculated correctly such things ranging from the fragmentation function of b quark, Bc-meson, the transverse momentum distribution to total cross section of the ground state and excited state of Bc-meson. The width of the main decay channel of Bc-meson and the lifetime of Bc-meson are also calculated. He explicitly predicted the way and possibility of experimenting with Bc-meson. In 1998, the experiment of TEVATRON in the United States took the lead in discovering the Bc-meson as predicted by theory. The theoretically produced sub-BCVEGPY and GENXICC, which were written and upgraded in time to produce "double-flavored" particles, have been very useful for experimental research and have been used by several experimental groups. Focusing on the experiments of combining medium and high energy physics in China, he carried out relevant theoretical research and put forward valuable suggestions for our experiments. He has won the first prize of the Natural Science of the Chinese Academy of Sciences and the Wu Youxun Physics Prize of the Chinese Physical Society.

  • 更新时间

    2019年06月12日

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