Recent BES measurements and the hadronic contribution to the QED vacuum polarization

Details Recent BES measurements and the hadronic contribution to the QED vacuum polarization Recent BES measurements and the hadronic contribution to the QED vacuum polarization

2011-06-15

arxiv.org/abs/1106.2991v1

Physics

High Energy Physics

High Energy Physics - Experiment

3 pages, 1 figure

Scientific paper

We have updated our evaluation of the hadronic contribution to the running of the QED fine structure constant using the recent precise measurements of the e+e- annihilation at the center-of-mass (c.m.s.) energy region between 2.6 and 3.65 GeV performed by the BES collaboration. In the low energy region, around the rho resonance, we include the recent measurements from the BABAR, CDM-2, KLOE and SND collaborations. We obtain Delta alpha (5)_had (s) = 0.02750 +/- 0.00033 at s = m_Z^2.

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