R Measurement and Standard Model Test

HUANG Guang-Shun

Chinese Physics C> 2002, Vol. 26> Issue(S1) : 41-46

R Measurement and Standard Model Test

HUANG Guang-Shun ^,

Institute of High Energy Physics, CAS, Beijing 100039, ChinaChina Center of Advanced Science and Technology, Beijing 100080, China

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Abstract：
With an upgraded Beijing Spectrometer (BESII) at the Beijing Electron Positron Collider (BEPC), the BES collaboration finished two runs of R scan in the energy region from 2 to 5 GeV. R values for all 6+85 scanned energy points are presented, with an average undertainty of 6.6%,which represents an improvement by a factor of 2—3. These measurements make an important contribution to the precision determination of a(M2Z), the QED coupling constant evaluated at the Z pole. The results also contribute to the interpretation of muon g－2 measurement.

References

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HUANG Guang-Shun. R Measurement and Standard Model Test[J]. Chinese Physics C, 2002, 26(S1): 41-46.

HUANG Guang-Shun. R Measurement and Standard Model Test[J]. Chinese Physics C, 2002, 26(S1): 41-46. shu

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Received: 1900-01-01
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沈阳化工大学材料科学与工程学院沈阳 110142

R Measurement and Standard Model Test

Corresponding author: HUANG Guang-Shun,

Institute of High Energy Physics, CAS, Beijing 100039, ChinaChina Center of Advanced Science and Technology, Beijing 100080, China

Received Date: 1900-01-01

Accepted Date: 1900-01-01

Available Online: 2002-06-24

Abstract: With an upgraded Beijing Spectrometer (BESII) at the Beijing Electron Positron Collider (BEPC), the BES collaboration finished two runs of R scan in the energy region from 2 to 5 GeV. R values for all 6+85 scanned energy points are presented, with an average undertainty of 6.6%,which represents an improvement by a factor of 2—3. These measurements make an important contribution to the precision determination of a(M2Z), the QED coupling constant evaluated at the Z pole. The results also contribute to the interpretation of muon g－2 measurement.

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