Determination of the LEP beam energy using radiative fermion-pair events

• Published in: Physics letters. B Vol. 604; no. 1-2; pp. 31 - 47
• Main Authors: Ainsley, C., Alexander, G., Amaral, P., Anagnostou, G., Axen, D., Bailey, I., Bell, K.W., Bellerive, A., Benelli, G., Bethke, S., Bock, P., Brown, R.M., Campana, S., Capiluppi, P., Carnegie, R.K., Carter, A.A., Carter, J.R., Chang, C.Y., Cuffiani, M., De Roeck, A., De Wolf, E.A., Desch, K., Dubbert, J., Etzion, E., Fabbri, F., Fleck, I., Ford, M., Gagnon, P., Giunta, M., Goldberg, J., Gross, E., Günther, P.O., Gupta, A., Hanson, G.G., Hauschild, M., Jeremie, H., Jovanovic, P., Kanzaki, J., Kawagoe, K., Kawamoto, T., Kellogg, R.G., Kennedy, B.W., Kobayashi, T., Kobel, M., Krämer, T., von Krogh, J., Kuhl, T., Letts, J., Lloyd, S.L., Lu, J., Ludwig, A., Marcellini, S., Martin, A.J., Mashimo, T., Mättig, P., McPherson, R.A., Menges, W., Merritt, F.S., Mes, H., Meyer, N., Mikenberg, G., Mohr, W., Mori, T., Nakamura, I., Nanjo, H., Neal, H.A., Nisius, R., O'Neale, S.W., Oreglia, M.J., Pahl, C., Pilcher, J.E., Pinfold, J., Pooth, O., Przybycień, M., Rabbertz, K., Rossi, A.M., Rozen, Y., Saeki, T., Sarkisyan, E.K.G., Schaile, O., Schieck, J., Schörner-Sadenius, T., Schröder, M., Seuster, R., Shears, T.G., Spano, F., Stahl, A., Torrence, E., Toya, D., Trigger, I., Ueda, I., Vollmer, C.F., Voss, H., Vossebeld, J., Ward, C.P., Ward, D.R., Wells, P.S., Wyatt, T.R., Zer-Zion, D., Zivkovic, L.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 16.12.2004; Elsevier Science
• Subjects: Exact sciences and technology; Physics; The physics of elementary particles and fields; Fermions; Uncertainty
• ISSN: 0370-2693; 1873-2445
• DOI: 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 to 209 GeV. We find no evidence of a disagreement between the OPAL data and the LEP Energy Working 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.