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. RI Jones, Roger/H-5578-2011; Passalacqua, Luca/F-5127-2011; Murtas, Fabrizio/B-5729-2012; O'Shea, Val/G-1279-2010; Ferrante, Isidoro/F-1017-2012
Determination of the LEP centre-of-mass energy from Z gamma events
TRICOMI, Alessia Rita;
1999-01-01
Abstract
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. RI Jones, Roger/H-5578-2011; Passalacqua, Luca/F-5127-2011; Murtas, Fabrizio/B-5729-2012; O'Shea, Val/G-1279-2010; Ferrante, Isidoro/F-1017-2012I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
