Observation of the Muon Inner Bremsstrahlung at LEP1

Details Observation of the Muon Inner Bremsstrahlung at LEP1 Observation of the Muon Inner Bremsstrahlung at LEP1

2009-01-28

arxiv.org/abs/0901.4488v1

Eur.Phys.J.C57:499-514,2008

Physics

High Energy Physics

High Energy Physics - Experiment

24 pages, 6 figures, Accepted by Eur. Phys. J. C

Scientific paper

10.1140/epjc/s10052-008-0779-z

Muon bremsstrahlung photons converted in front of the DELPHI main tracker (TPC) in dimuon events at LEP1 were studied in two photon kinematic ranges: 0.2 < E_gamma <= 1 GeV and transverse momentum with respect to the parent muon p_T < 40 MeV/c, and 1 < E_gamma <= 10 GeV and p_T < 80 MeV/c . A good agreement of the observed photon rate with predictions from QED for the muon inner bremsstrahlung was found, contrary to the anomalous soft photon excess that has been observed recently in hadronic Z^0 decays. The obtained ratios of the observed signal to the predicted level of the muon bremsstrahlung are 1.06 +/- 0.12 +/- 0.07 in the photon energy range 0.2 < E_gamma <= 1 GeV and 1.04 +/- 0.09 +/- 0.12 in the photon energy range 1 < E_gamma <= 10 GeV. The bremsstrahlung dead cone is observed for the first time in the direct photon production at LEP.

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