Measurements of the Continuum R_uds and R Values in e⁺e^- Annihilation in the Energy Region between 3.650 and 3.872 GeV

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M. Ablikim,¹ J. Z. Bai,¹ Y. Ban,¹¹ J. G. Bian,¹ X. Cai,¹ H. F. Chen,¹⁵ H. S. Chen,¹ H. X. Chen,¹ J. C. Chen,¹ Jin Chen,¹ Y. B. Chen,¹ S. P. Chi,² Y. P. Chu,¹ X. Z. Cui,¹ Y. S. Dai,¹⁷ Z. Y. Deng,¹ L. Y. Dong,¹ Q. F. Dong,¹⁴ S. X. Du,¹ Z. Z. Du,¹ J. Fang,¹ S. S. Fang,² C. D. Fu,¹ C. S. Gao,¹ Y. N. Gao,¹⁴ S. D. Gu,¹ Y. T. Gu,⁴ Y. N. Guo,¹ Y. Q. Guo,¹ K. L. He,¹ M. He,¹² Y. K. Heng,¹ H. M. Hu,¹ T. Hu,¹ X. P. Huang,¹ X. T. Huang,¹² X. B. Ji,¹ X. S. Jiang,¹ J. B. Jiao,¹² D. P. Jin,¹ S. Jin,¹ Yi Jin,¹ Y. F. Lai,¹ G. Li,² H. B. Li,¹ H. H. Li,¹ J. Li,¹ R. Y. Li,¹ S. M. Li,¹ W. D. Li,¹ W. G. Li,¹ X. L. Li,⁸ X. Q. Li,¹⁰ Y. L. Li,⁴ Y. F. Liang,¹³ H. B. Liao,⁶ C. X. Liu,¹ F. Liu,⁶ Fang Liu,¹⁵ H. H. Liu,¹ H. M. Liu,¹ J. Liu,¹¹ J. B. Liu,¹ J. P. Liu,¹⁶ R. G. Liu,¹ Z. A. Liu,¹ F. Lu,¹ G. R. Lu,⁵ H. J. Lu,¹⁵ J. G. Lu,¹ C. L. Luo,⁹ F. C. Ma,⁸ H. L. Ma,¹ L. L. Ma,¹ Q. M. Ma,¹ X. B. Ma,⁵ Z. P. Mao,¹ X. H. Mo,¹ J. Nie,¹ H. P. Peng,¹⁵ N. D. Qi,¹ H. Qin,⁹ J. F. Qiu,¹ Z. Y. Ren,¹ G. Rong,¹ L. Y. Shan,¹ L. Shang,¹ D. L. Shen,¹ X. Y. Shen,¹ H. Y. Sheng,¹ F. Shi,¹ X. Shi,¹¹ H. S. Sun,¹ J. F. Sun,¹ S. S. Sun,¹ Y. Z. Sun,¹ Z. J. Sun,¹ Z. Q. Tan,⁴ X. Tang,¹ Y. R. Tian,¹⁴ G. L. Tong,¹ D. Y. Wang,¹ L. Wang,¹ L. S. Wang,¹ M. Wang,¹ P. Wang,¹ P. L. Wang,¹ W. F. Wang,¹ Y. F. Wang,¹ Z. Wang,¹ Z. Y. Wang,¹ Zhe Wang,¹ Zheng Wang,² C. L. Wei,¹ D. H. Wei,¹ N. Wu,¹ X. M. Xia,¹ X. X. Xie,¹ B. Xin,⁸ G. F. Xu,¹ Y. Xu,¹⁰ M. L. Yan,¹⁵ F. Yang,¹⁰ H. X. Yang,¹ J. Yang,¹⁵ Y. X. Yang,³ M. H. Ye,² Y. X. Ye,¹⁵ Z. Y. Yi,¹ G. W. Yu,¹ C. Z. Yuan,¹ J. M. Yuan,¹ Y. Yuan,¹ S. L. Zang,¹ Y. Zeng,⁷ Yu Zeng,¹ B. X. Zhang,¹ B. Y. Zhang,¹ C. C. Zhang,¹ D. H. Zhang,¹ H. Y. Zhang,¹ J. W. Zhang,¹ J. Y. Zhang,¹ Q. J. Zhang,¹ X. M. Zhang,¹ X. Y. Zhang,¹² Yiyun Zhang,¹³ Z. P. Zhang,¹⁵ Z. Q. Zhang,⁵ D. X. Zhao,¹ J. W. Zhao,¹ M. G. Zhao,¹ P. P. Zhao,¹ W. R. Zhao,¹ H. Q. Zheng,¹¹ J. P. Zheng,¹ Z. P. Zheng,¹ L. Zhou,¹ N. F. Zhou,¹ K. J. Zhu,¹ Q. M. Zhu,¹ Y. C. Zhu,¹ Y. S. Zhu,¹ Yingchun Zhu,¹ Z. A. Zhu,¹ B. A. Zhuang,¹ X. A. Zhuang,¹ and B. S. Zou¹

(BES Collaboration)

¹Institute of High Energy Physics, Beijing 100049, People's Republic of China
²China Center for Advanced Science and Technology (CCAST), Beijing 100080, People's Republic of China
³Guangxi Normal University, Guilin 541004, People's Republic of China
⁴Guangxi University, Nanning 530004, People's Republic of China
⁵Henan Normal University, Xinxiang 453002, People's Republic of China
⁶Huazhong Normal University, Wuhan 430079, People's Republic of China
⁷Hunan University, Changsha 410082, People's Republic of China
⁸Liaoning University, Shenyang 110036, People's Republic of China
⁹Nanjing Normal University, Nanjing 210097, People's Republic of China
¹⁰Nankai University, Tianjin 300071, People's Republic of China
¹¹Peking University, Beijing 100871, People's Republic of China
¹²Shandong University, Jinan 250100, People's Republic of China
¹³Sichuan University, Chengdu 610064, People's Republic of China
¹⁴Tsinghua University, Beijing 100084, People's Republic of China
¹⁵University of Science and Technology of China, Hefei 230026, People's Republic of China
¹⁶Wuhan University, Wuhan 430072, People's Republic of China
¹⁷Zhejiang University, Hangzhou 310028, People's Republic of China

Received 30 September 2006; published 27 December 2006

Wereport measurements of the continuum R_uds near the center-of-mass energyof 3.70 GeV, the R_{uds(c)+(3770)}(s) and the R_had(s) values in e⁺e⁻annihilation at 68 energy points in the energy region between3.650 and 3.872 GeV with the BES-II detector at the BEPCCollider. We obtain the R_uds for the continuum light hadron(containing u, d, and s quarks) production near the D [overline D] threshold to be R_uds=2.141±0.025±0.085.

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.97.262001
DOI:	10.1103/PhysRevLett.97.262001
PACS:	13.66.Bc; 12.15.-y; 12.38.Qk 13.66.Bc Hadron production in e^–e⁺ interactions 12.15.-y Electroweak interactions 12.38.Qk Experimental tests of QCD YEAR: 2006