北京谱仪J／ψ事例的Bose－Einstein关联  

BOSE-EINSTEIN CORRELATION IN THE,J/ψ EVENTS AT BES

作　　者：扬德林 

机构地区：[1]郑州大学物理工程学院

出　　处：《郑州大学学报（自然科学版）》1996年第2期44-49,共6页Journal of Zhengzhou University (Natural Science)

摘　　要：本文用北京谱仪（ＢＥＳ）获得的ｅ＋ｅ－反应产生的Ｊ／ψ事例终态，研究（π＋π＋）对的ＢｏｓｅＥｉｎｓｔｅｉｎ关联Ｊ／ψ事例产生的质心能量为＝３．０９７ＧｅＶ，从重建后的１４０多万事例中筛选出２４万多事例．研究它们的π对按四动量差平方（Ｑ２）的分布函数，并对初步结果作了各种修小．用公式拟合得到参数值λ＝１．０００±０．０３６，ｒ＝０．７９０±０．０４１ｆｍ．并且发现，各种修正对ｒ的影响不大．这些结果同ＭＡＲＫⅡ探测器工作在ＳＰＥＡＲｅ＋ｅ－贮存环上获得的Ｊ／ψ事例的分析结果一致．This artical sindies the Bose-Einstein correlation of the(π+π+)pairs in the J/ψ event final states produced by e+e- reaction at Beijing Spectrometer (BES). The J/ψevents energy in mass centes system is =3. 097GeV. More than 240 thousand events from more than 1. 4 million reconstructed ones are chosen. And analyses their π pairs'distribution as a function of Q2(square of the difference of four-momenta). It does the corrections to the primary result. The values of the parameters λ=1. 000±0. 036 and r= 0. 790±0. 041fm by fitting curve are obtained. The influcence of the corrections on r is small. The results are correspondent with that of the MARK Ⅱ detector working at SPEAR e+e- storage rings.

关 键 词：J/ψ事例 B-E关联 北京谱仪 对撞机 探测器 

分 类 号：O572.21[理学—粒子物理与原子核物理]