Tests of quantum chromodynamics and a direct measurement of the strong coupling constant αs at √s=30 GeV
Tests of quantum chromodynamics and a direct measurement of the strong coupling constant αs at √s=30 GeV
复制标题
量子色动力学测试以及 √s=30 GeV 强耦合常数 αs 的直接测量
DOI：
10.1016/0370-2693(79)90092-3
复制
发表时间：
1979
影响因子：
4.4
通讯作者：
R. Zhu
中科院分区：
文献类型：
--
作者：
D. Barber;U. Becker;H. Benda;A. Boehm;J. Branson;J. Bron;D. Buikman;J. Burger;C. Chang;H. Chen;M. Chen;Cp Cheng;Y. Chu;R. Clare;P. Duinker;G. Fang;H. Fesefeldt;D. Fong;M. Fukushima;J. Guo;A. Hariri;G. Herten;M. Ho;H. Hsu;T. Hsu;R. Kadel;W. Krenz;J. Li;Q. Li;M. Lu;D. Luckey;C. M. Ma;D. Ma;G. Massaro;T. Matsuda;H. Newman;M. Pohl;F. Poschmann;J. Revol;M. Rohde;H. Rykaczewski;K. Sinram;H. Tang;L. Tang;S. Ting;K. Tung;F. Vannucci;X. Wang;P. Wei;M. White;G. Wu;T. Wu;J. Xi;P. Yang;X. H. Yu;N. Zhang;R. Zhu
本文报道了用PETRA的MARK-J探测器在质心能量为30 GeV时对反应e++ e−→强子喷注的测量结果。通过测量中性粒子和带电粒子的能量和角分布，我们能够明确地隔离在一个运动学区域中的三喷流事件，其中来自qq和相空间贡献以及其他过程的背景很小。与量子色动力学的数据进行了各种比较。三喷流事件的相对产额和事件的形状分布使我们能够确定αs= 0.23 ± 0.02（统计误差），系统误差为± 0.04。
We report the measurement of the reaction e++ e−→ hadronic jets at a center-of-mass energy √s=30 GeV using the MARK-J detector at PETRA. By measuring the energy and angular distribution of both neutrals and charged particles we were able to isolate unambiguously the three-jet events in a kinematic region where the backgrounds from qq and phase space contributions and other processes are small. Various comparisons of the data with quantum chromodynamics were made. The relative yield of three-jet events and the shape distribution of the events enable us to determine αs= 0.23 ± 0.02 (statistical error) with a systematic error of ± 0.04.