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Measurement of the Z-boson mass using e+e -> Zγ events at centre-of-mass energies above the Z pole

CollaborationWith : Achard, Pablo / Bourquin, Maurice / Braccini, Saverio / Chamizo Llatas, Maria / Deglon, Patrick / Delmeire, Evelyne / Echenard, Bertrand / Extermann, Pierre / Field, John / Kienzle, Maria-Novella / Malgeri, Luca / Natale, Sonia / Pohl, Martin / Straessner, Arno
Published in Physics Letters. B. 2004, vol. 585, no. 1-2, p. 42-52
Abstract Events from the e+e−→Zγ process with hard initial-state radiation collected with the L3 detector at centre-of-mass energies between 183 and 209 GeV are used to measure the mass of the Z boson. Decays of the Z boson into hadrons or muon pairs are considered and the Z mass is determined to be 91.272±0.032(stat)±0.033(syst) GeV, in agreement with the value measured at the Z resonance. Alternatively, assuming this measured value of the Z mass, the method determines the LEP centre-of-mass energy, found to be 175±68(stat)±68(syst) MeV lower than the nominal value.
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L3 COLLABORATION. Measurement of the Z-boson mass using e+e -> Zγ events at centre-of-mass energies above the Z pole. In: Physics Letters. B, 2004, vol. 585, n° 1-2, p. 42-52. https://archive-ouverte.unige.ch/unige:42588

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Deposited on : 2014-12-05

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