New R values in 2-5 GeV from the BESII at BEPC
Z.G. Zhao
TL;DR
This paper reports new measurements of the R values in the 2-5 GeV energy range using BESII at BEPC, with about 7% uncertainty, impacting electroweak fits and g-2 interpretation.
Contribution
It provides the first comprehensive set of R values in this energy region with upgraded detector technology.
Findings
Measured 85 R values with ~7% uncertainty
Significant impact on Higgs mass predictions from electroweak fits
Contributes to the interpretation of the E821 g-2 experiment
Abstract
We report preliminary values for all 85 energy points scanned in the energy region of 2-5 GeV with the upgraded Beijing Spectrometer (BESII) at the Beijing Electron Positron Collider (BEPC). The typical uncertainty on the R values we measured is about 7%. The new R values have a significant impact on the predicted mass of the Higgs coming from the global fit to the electroweak data, and will also contribute to the interpretation of the E821 g-2 experiment.
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Taxonomy
TopicsRadiomics and Machine Learning in Medical Imaging