Radiative returns to the Z resonance (Z gamma events) are used to determine the LEP2 centre-of-mass energy from the data collected with the ALEPH detector in 1997. The average centre-of-mass energy is measured to he: E(CM) = 182.50 +/- 0.19(stat.) +/- 0.08 (syst.) GeV in good agreement with the precise determination by the LEP energy working group of 182.652 +/- 0.050 GeV. Lf applied to the measurement of the W mass. its precision translates into a systematic error on M(W), which is smaller than the statistical error achieved from the corresponding dataset. (C) 1999 Elsevier Science B.V. All rights reserved.
Titolo: | Determination of the LEP centre-of-mass energy from Z gamma events | |
Autori: | ||
Data di pubblicazione: | 1999 | |
Rivista: | ||
Digital Object Identifier (DOI): | http://dx.doi.org/10.1016/S0370-2693(99)00903-X | |
Handle: | http://hdl.handle.net/11384/6979 | |
Appare nelle tipologie: | 1.1 Articolo in rivista |
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