Observation of the muon inner bremsstrahlung at LEP1

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 ag...

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Bibliographic Details
Published in:	The European physical journal. C, Particles and fields Vol. 57; no. 3; pp. 499 - 514
Main Authors:	Amapane, N., Amato, S., Anjos, N., Ask, S., Augustin, J. E., Augustinus, A., Bambade, P., Barbier, R., Benvenuti, A., Berat, C., Bloch, D., Blom, M., Borisov, G., Bowcock, T. J. V., Bracko, M., Brodet, E., Brunet, J. M., Chierici, R., Contri, R., Cosme, G., Cossutti, F., Crennell, D., Cuevas, J., De Boer, W., De Clercq, C., De Lotto, B., Di Ciaccio, L., Eigen, G., Elsing, M., Espirito Santo, M. C., Fanourakis, G., Fernandez, J., Ferrer, A., Foeth, H., Fokitis, E., Fuster, J., Garcia, C., Hamacher, K., Hamilton, K., Hauler, F., Hoffman, J., Holmgren, S-O., Holt, P. J., Jeans, D., Joram, C., Katsoufis, E., Kernel, G., Kerzel, U., King, B. T., Kourkoumelis, C., Lamsa, J., Lemonne, J., Lipniacka, A., Lopez, J. M., Lutz, P., MacNaughton, J., Mandl, F., Marin, J-C., Moenig, K., Monge, R., Montenegro, J., Morettini, P., Muryn, B., Myatt, G., Navarria, F., Nawrocki, K., Nicolaidou, R., Obraztsov, V., Orava, R., Paiano, S., Papadopoulou, Th. D., Pimenta, M., Poireau, V., Pol, M. E., Pukhaeva, N., Reid, D., Reinhardt, R., Roudeau, P., Rovelli, T., Ryabtchikov, D., Sadovsky, A., Salmi, L., Savoy-Navarro, A., Schwickerath, U., Smadja, G., Sopczak, A., Sosnowski, R., Spassov, T., Szczekowski, M., Szeptycka, M., Timmermans, J., Tortosa, P., Travnicek, P., Troncon, C., Tyapkin, I. A., Veloso, F., Verdier, P., Wilkinson, G., Zalewska, A., Zintchenko, A.
Format:	Journal Article
Language:	English
Published:	Berlin/Heidelberg Springer-Verlag 2008 Springer Springer Nature B.V Springer Verlag (Germany)
Subjects:	Astronomy Astrophysics and Cosmology Bremsstrahlung Elementary Particles Exact sciences and technology Fysik Hadrons Heavy Ions High Energy Physics - Experiment Measurement Science and Instrumentation Muons NATURAL SCIENCES NATURVETENSKAP Nuclear Energy Nuclear Physics Photons Physical Sciences Physics Physics and Astronomy Predictions Quantum Field Theories Quantum Field Theory Regular Article - Experimental Physics String Theory Subatomic Physics Subatomär fysik The physics of elementary particles and fields Transverse momentum Soft Photon Photon Energy Range DELPHI Collaboration Monte Carlo Photon Production Bremsstrahlung Quantum electrodynamics Kinematics Elementary particles Mathematical physics Muons Photon production
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Summary:	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.
ISSN:	1434-6044 1434-6052 1434-6052
DOI:	10.1140/epjc/s10052-008-0779-z