XYZ particles at Belle

In this paper, I review recent progress in the study of the XYZ particles at Belle. I only focus on studies with charmonium and one or more light mesons in the final states. This covers the X（3872）, X（3915）, Y（4140）, X（4350）, and the charged Z states.     

Hadron spectroscopy from B-factories

We review the recent experimental results on hadron spectroscopy from B-factories focusing on the exotic charmonium-like states.Among them we discuss the X（3872）,Y（3940）,Z（4430） ＋,Z（4050） ＋,Z（4250） ＋ and Y（4140） states found in B-meson decays,the X（3940） and X（4160） states produced in double charmonium production,the Y（4260）,Y（4325）,Y（4660） and X（4630） states produced with initial-state radiation in e ＋ eannihilation and the X（3915）,Y（4350） states observed in two-photon collisions.     

RP-HPLC测定罗勒中石吊兰素的含量

建立反相-高效液相色谱法(RP-HPLC)测定罗勒(Ocimum basilicumL.)中石吊兰素的含量。用Microsorb-M V 100-5C18(4.6mm×250mm,5μm)色谱柱,甲醇:1%醋酸=86:14(V/V)为流动相,流速为0.5mL/min,检测波长为335nm。石吊兰素浓度在0.27—32.4μg/mL范围内与峰面积线性关系良好(r=0.9999),方法平均回收率大于99%(n=9)。方法简单、可靠,可应用于罗勒植物中石吊兰素的含量测定。     

Charmonium results from BES

Using ～ 14 × 10^6 ψ（2S） and ～ 58 × 10^ J/ ψ data collected at BES Ⅱ/BEPC, the branching fraction of ψ（2S）→Ω-Ω^＋ is measured with about 5a statistical significance. The A electric dipole and ∧ decay parameter are studied using the decay J/ψ →∧∧→ ppπ^＋π^-. Using （106±3）× 10^6 ψ（2S） decays collected at BESⅢ/BEPC Ⅱ, we have obtained some interesting physics results. The branching fractions of XcJ→π^0π^0, ηη are measured with precision improved. The mass and width of he（l^1P1） state, together with the branching fractions of Br（ψ（2S） →π^0hc） and Br（hc →γηc） are the first measurements. Surprisingly, the decays of Xc1→φφ, ωω, and ωφ are firstly observed in BESⅢ data.     

Physical design of positronium time of flight spectroscopy apparatus

Positronium time of flight spectroscopy（Ps-TOF）is an effective technique for porous material research.It has advantages over other techniques for analyzing the porosity and pore tortuosity of materials.This paper describes a design for Ps-TOF apparatus based on the Beijing intense slow positron beam,supplying a new material characterization technique.In order to improve the time resolution and increase the count rate of the apparatus,the detector system is optimized.For 3 eV o-Ps,the time broadening is 7.66 ns and the count rate is 3 cps after correction.     

正交试验法优选都梁凝胶贴剂的提取工艺

采用超声法优选都梁凝胶贴剂中白芷、川芎药对的最佳提取工艺.按照L9（34）正交试验设计,以欧前胡素、阿魏酸的转移率及干浸膏得率为综合评价指标,用高效液相色谱法进行含量测定.结果表明,都梁凝胶贴剂中白芷、川芎药对的最佳超声提取工艺为：8倍量的80％乙醇提取2次,每次超声40min;此时浸膏中欧前胡素的平均含量为0.1379％,阿魏酸的平均含量为0.1410％.本实验所建立的高效液相色谱法的准确度、精密度与重现性良好;提取工艺简便,合理.     

把简单的事情复杂化叫文化,把复杂的事情简单化是效率——Mind Concert Academic Salon学术讨论侧记

"简单"与"复杂"是人们在剖析客观事物时所归纳出的两个极端属性,也是描述客观事物被人了解及掌握难易程度的感观印象。因此"简单"与"复杂"既有客观的一面,也有主观的一面,因人而异,因事而异。只要人类现代文明进程不被中止,"简单"与"复杂"将会是一个永恒的话题,争论也将永无休止。总体而言,简单是对事物的一种高度概括,只有真正抓住了事物的本质,越是简单平淡的表述,就越具有摄人心魄、令人永世难忘的魅力。     

有耗异向介质层覆盖普通介质圆柱电磁特性的研究

研究了线电流源平行放置在有耗异向介质层覆盖的无限长介质圆柱附近模型的电磁特性.首先,提出电磁模型并给出此电磁模型的精确解.其次,利用精确解进行数值计算,得到不同电磁参数情况下该电磁模型的近场分布图形,并通过方向性系数和归一化辐射阻抗研究其远场特性.由于有耗异向介质的负折射特性和损耗的同时作用,相比于无耗异向介质层以及有耗普通介质层,得到了有耗异向介质层覆盖普通介质圆柱模型在近场和远场特性上极为不同的电磁特性. 关键词： 线电流源 异向介质 方向性系数 辐射阻抗     

Fast computation of observed cross section for ψ′ → PP decays

It has been conjectured that the relative phase between strong and electromagnetic amplitudes is universally -90° in charmonium decays. ψ′ decaying into a pseudoscalar pair provides a possibility to test this conjecture. However, the experimentally observed cross section for such a process is depicted by the two-fold integral, which takes into account the initial state radiative (ISR) correction and energy spread effect. Using the generalized linear regression approach, a complex energy-dependent factor is ...