Journal
EUROPEAN PHYSICAL JOURNAL C
Volume 57, Issue 3, Pages 499-514Publisher
SPRINGER
DOI: 10.1140/epjc/s10052-008-0779-z
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Funding
- Austrian Federal Ministry of Education, Science and Culture [GZ 616.364/2-III/2a/98]
- FNRS-FWO
- Belgian Federal Office for Scientific, Technical and Cultural affairs (OSTC), Belgium
- FINEP
- CNPq
- CAPES
- FUJB
- FAPERJ, Brazil
- Ministry of Education of the Czech Republic [LC527]
- Academy of Sciences of the Czech Republic [AV0Z10100502]
- Commission of the European Communities (DG XII)
- Direction des Sciences de la Matiere, CEA, France
- Bundesministerium fur Bildung, Wissenschaft
- Forschung und Technologie, Germany
- General Secretariat for Research and Technology, Greece
- National Science Foundation (NWO)
- Foundation for Research on Matter (FOM)
- The Netherlands, Norwegian Research Council,
- State Committee for Scientific Research, Poland [SPUB-M/CERN/PO3/DZ296/2000, SPUB-M/CERN/PO3/DZ297/2000, 2P03B 104 19, 2P03B 69 23(2002-2004)]
- FCT - Fundacao para a Ciencia e Tecnologia, Portugal
- Vedecka grantova agentura MS SR, Slovakia [95/5195/134]
- Ministry of Science and Technology of the Republic of Slovenia, CICYT, Spain [AEN99-0950, AEN99-0761]
- The Swedish Research Council,
- Particle Physics and Astronomy Research Council, UK
- Department of Energy, USA [DE-FG02-01ER41155]
- EEC RTN [HPRN-CT-00292-2002]
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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 pT < 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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