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Muon-pair and tau-pair production in two-photon collisions at LEP

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. 53-62
Abstract The QED processes e+e−->e+e−μ+μ− and e+e-> e+e−τ+τ− are studied with the L3 detector at LEP using an untagged data sample collected at centre-of-mass energies 161 GeV≤√s≤209 GeV. The τ-pairs are observed through the associated decay of one τ into eνν and the other into ππν. The cross sections are measured as a function of . For muon pairs, the cross section of the γγ→μ+μ− process is also measured as a function of the two-photon centre-of-mass energy for 3 GeV⩽Wγγ⩽40 GeV. Good agreement is found between these measurements and the O(a4) QED expectations. In addition, limits on the anomalous magnetic and electric dipole moments of the τ lepton are extracted.
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L3 COLLABORATION. Muon-pair and tau-pair production in two-photon collisions at LEP. In: Physics Letters. B, 2004, vol. 585, n° 1-2, p. 53-62. doi: 10.1016/j.physletb.2004.02.012 https://archive-ouverte.unige.ch/unige:42266

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Deposited on : 2014-11-28

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