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 γ ≥1 GeV and transverse momentum with respect to the parent muon p T <40 MeV/c, and 1<E γ ≥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 γ ≥1 GeV and 1.04±0.09±0.12 in the photon energy range 1<E γ ≥10 GeV. The bremsstrahlung dead cone is observed for the first time in the direct photon production at LEP. © 2008 Springer-Verlag / Società Italiana di Fisica.

Abdallah, J., Abreu, P., Adam, W., Adzic, P., Albrecht, T., Alemany Fernandez, R., et al. (2008). Observation of the muon inner bremsstrahlung at LEP1. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 57(3), 499-514 [10.1140/epjc/s10052-008-0779-z].

Observation of the muon inner bremsstrahlung at LEP1

CALVI, MARTA;PAGANONI, MARCO;TABARELLI DE FATIS, TOMMASO;
2008

Abstract

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
Articolo in rivista - Articolo scientifico
Engineering (miscellaneous); Physics and Astronomy (miscellaneous)
English
2008
57
3
499
514
none
Abdallah, J., Abreu, P., Adam, W., Adzic, P., Albrecht, T., Alemany Fernandez, R., et al. (2008). Observation of the muon inner bremsstrahlung at LEP1. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 57(3), 499-514 [10.1140/epjc/s10052-008-0779-z].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/155951
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