Determination of the LEP Beam Energy using Radiative Fermion-pair Events

Details Determination of the LEP Beam Energy using Radiative Fermion-pair Events Determination of the LEP Beam Energy using Radiative Fermion-pair Events

2004-08-25

arxiv.org/abs/hep-ex/0408130v1

Phys.Lett.B604:31-47,2004

Physics

High Energy Physics

High Energy Physics - Experiment

24 pages, 5 figures, Submitted to Phys. Letts. B

Scientific paper

10.1016/j.physletb.2004.10.046

We present a determination of the LEP beam energy using "radiative return" fermion-pair events recorded at centre-of-mass energies from 183 GeV to 209 GeV. We find no evidence of a disagreement between the OPAL data and the LEP Energy Workings Group's standard calibration. Including the energy- averaged 11 MeV uncertainty in the standard determination, the beam energy we obtain from the OPAL data is higher than that obtained from the LEP calibration by 0+-34(stat.)+-27(syst.)MeV

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