Elsevier

Physics Letters B

Volume 677, Issue 5, 29 June 2009, Pages 239-245
Physics Letters B

R value measurements for e+e annihilation at 2.60, 3.07 and 3.65 GeV

https://doi.org/10.1016/j.physletb.2009.05.055Get rights and content
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Abstract

Using a data sample with a total integrated luminosity of 10.0 pb−1 collected at center-of-mass energies of 2.6, 3.07 and 3.65 GeV with BESII, cross sections for e+e annihilation into hadronic final states (R values) are measured with statistical errors that are smaller than 1%, and systematic errors that are about 3.5%. The running strong interaction coupling constants αs(3)(s) and αs(5)(MZ2) are determined from the R values.

Cited by (0)

1

Current address: Zhengzhou University, Zhengzhou 450001, People's Republic of China.

2

Current address: Johns Hopkins University, Baltimore, MD 21218, USA.

3

Current address: University of Oklahoma, Norman, OK 73019, USA.

4

Current address: Jinan University, Jinan 250022, People's Republic of China.

5

Current address: National Natural Science Foundation of China, Beijing 100085, People's Republic of China.

6

Current address: University of Hong Kong, Pok Fu Lam Road, Hong Kong.

7

Current address: Graduate University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.

8

Current address: Cornell University, Ithaca, NY 14853, USA.