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.
Determination of the LEP centre-of-mass energy from Z gamma events
ROLANDI, LUIGI;LIGABUE, FRANCO;LUSIANI, Alberto;
1999
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.File in questo prodotto:
Non ci sono file associati a questo prodotto.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
