/ Experiment-HEP arXiv:0901.4488


Observation of the Muon Inner Bremsstrahlung at LEP1


Abdallah, J. (Paris U., VI-VII) ; Abreu, P. (Lisbon, LIFEP) ; Adam, W. (Vienna, OAW) ; Adzic, P. (Democritos Nucl. Res. Ctr.) ; Albrecht, T. (Karlsruhe U., EKP) ; Alemany-Fernandez, R. (CERN) ; Allmendinger, T. (Karlsruhe U., EKP) ; Allport, P.P. (Liverpool U.) ; Amaldi, U. (INFN, Milan Bicocca) ; Amapane, N. (INFN, Turin) ; Amato, S. (Rio de Janeiro Federal U.) ; Anashkin, E. (INFN, Padua) ; Andreazza, A. (INFN, Milan) ; Andringa, S. (Lisbon, LIFEP) ; Anjos, N. (Lisbon, LIFEP) ; Antilogus, P. (Paris U., VI-VII) ; Apel, W-D. (Karlsruhe U., EKP) ; Arnoud, Y. (LPSC, Grenoble) ; Ask, S. (CERN) ; Asman, B. (Stockholm U.) ; Augustin, J.E. (Paris U., VI-VII) ; Augustinus, A. (CERN) ; Baillon, P. (CERN) ; Ballestrero, A. (Turin U.) ; Bambade, P. (Orsay, LAL) ; Barbier, R. (Lyon, IPN) ; Bardin, D. (Dubna, JINR) ; Barker, G.J. (Warwick U.) ; Baroncelli, A. (INFN, Rome3) ; Battaglia, M. (CERN) ; Baubillier, M. (Paris U., VI-VII) ; Becks, K-H. (Wuppertal U.) ; Begalli, M. (Rio de Janeiro State U.) ; Behrmann, A. (Wuppertal U.) ; Ben-Haim, E. (Orsay, LAL) ; Benekos, N. (Natl. Tech. U., Athens) ; Benvenuti, A. (INFN, Bologna) ; Berat, C. (LPSC, Grenoble) ; Berggren, M. (Paris U., VI-VII) ; Bertrand, D. (Brussels U., IIHE) ; Besancon, M. (SPhN, DAPNIA, Saclay) ; Besson, N. (SPhN, DAPNIA, Saclay) ; Bloch, D. (Strasbourg, IReS) ; Blom, M. (NIKHEF, Amsterdam) ; Bluj, M. (Warsaw U.) ; Bonesini, M. (INFN, Milan Bicocca) ; Boonekamp, M. (SPhN, DAPNIA, Saclay) ; Booth, P.S.L. (Liverpool U.) ; Borisov, G. (Lancaster U.) ; Botner, O. (Lancaster U.) ; Bouquet, B. (Orsay, LAL) ; Bowcock, T.J.V. (Liverpool U.) ; Boyko, I. (Dubna, JINR) ; Bracko, M. (Stefan Inst., Ljubljana) ; Brenner, R. (Lancaster U.) ; Brodet, E. (Oxford U.) ; Bruckman, P. (Cracow, INP) ; Brunet, J.M. (College de France) ; Buschbeck, B. (Vienna, OAW) ; Buschmann, P. (Wuppertal U.) ; Calvi, M. (INFN, Milan Bicocca) ; Camporesi, T. (CERN) ; Canale, V. (INFN, Rome2) ; Carena, F. (CERN) ; Castro, N. (Lisbon, LIFEP) ; Cavallo, F. (INFN, Bologna) ; Chapkin, M. (Serpukhov, IHEP) ; Charpentier, Ph. (CERN) ; Checchia, P. (INFN, Padua) ; Chierici, R. (CERN) ; Chliapnikov, P. (Serpukhov, IHEP) ; Chudoba, J. (CERN) ; Chung, S.U. (CERN) ; Cieslik, K. (Cracow, INP) ; Collins, P. (CERN) ; Contri, R. (INFN, Genoa) ; Cosme, G. (Orsay, LAL) ; Cossutti, F. (INFN, Trieste) ; Costa, M.J. (Valencia U.) ; Crennell, D. (Rutherford) ; Cuevas, J. (Oviedo U.) ; D'Hondt, J. (Brussels U., IIHE) ; da Silva, T. (Rio de Janeiro Federal U.) ; Da Silva, W. (Paris U., VI-VII) ; Della Ricca, G. (INFN, Trieste) ; De Angelis, A. (INFN, Udine) ; De Boer, W. (Karlsruhe U., EKP) ; De Clercq, C. (Brussels U., IIHE) ; De Lotto, B. (INFN, Udine) ; De Maria, N. (INFN, Turin) ; De Min, A. (INFN, Padua) ; de Paula, L. (Rio de Janeiro Federal U.) ; Di Ciaccio, L. (INFN, Rome2) ; Di Simone, A. (INFN, Rome3) ; Doroba, K. (Warsaw U.) ; Drees, J. (CERN) ; Eigen, G. (Bergen U.) ; Ekelof, T. (Lancaster U.) ; Ellert, M. (Lancaster U.) ; Elsing, M. (CERN) ; Espirito Santo, M.C. (Lisbon, LIFEP) ; Fanourakis, G. (Democritos Nucl. Res. Ctr.) ; Fassouliotis, D. (Athens U.) ; Feindt, M. (Karlsruhe U., EKP) ; Fernandez, J. (Cantabria Inst. of Phys.) ; Ferrer, A. (Valencia U.) ; Ferro, F. (INFN, Genoa) ; Flagmeyer, U. (Wuppertal U.) ; Foeth, H. (CERN) ; Fokitis, E. (Natl. Tech. U., Athens) ; Fulda-Quenzer, F. (Orsay, LAL) ; Fuster, J. (Valencia U.) ; Gandelman, M. (Rio de Janeiro Federal U.) ; Garcia, C. (Valencia U.) ; Gavillet, Ph. (CERN) ; Gazis, E. (Natl. Tech. U., Athens) ; Gokieli, R. (Warsaw U.) ; Golob, B. (Ljubljana U.) ; Gomez-Ceballos, G. (Cantabria Inst. of Phys.) ; Goncalves, P. (Lisbon, LIFEP) ; Graziani, E. (INFN, Rome3) ; Grosdidier, G. (Orsay, LAL) ; Grzelak, K. (Warsaw U.) ; Guy, J. (Rutherford) ; Haag, C. (Karlsruhe U., EKP) ; Hallgren, A. (Lancaster U.) ; Hamacher, K. (Wuppertal U.) ; Hamilton, K. (Oxford U.) ; Haug, S. (Oslo U.) ; Hauler, F. (Karlsruhe U., EKP) ; Hedberg, V. (Lund U.) ; Hennecke, M. (Karlsruhe U., EKP) ; Herr, H. (CERN) ; Hoffman, J. (Warsaw U.) ; Holmgren, S-O. (Stockholm U.) ; Holt, P.J. (CERN) ; Houlden, M.A. (Liverpool U.) ; Jackson, J.N. (Liverpool U.) ; Jarlskog, G. (Lund U.) ; Jarry, P. (SPhN, DAPNIA, Saclay) ; Jeans, D. (Oxford U.) ; Johansson, E.K. (Stockholm U.) ; Jonsson, P. (Lyon, IPN) ; Joram, C. (CERN) ; Jungermann, L. (Karlsruhe U., EKP) ; Kapusta, F. (Paris U., VI-VII) ; Katsanevas, S. (Lyon, IPN) ; Katsoufis, E. (Natl. Tech. U., Athens) ; Kernel, G. (Stefan Inst., Ljubljana) ; Kersevan, B.P. (Ljubljana U.) ; Kerzel, U. (Karlsruhe U., EKP) ; King, B.T. (Liverpool U.) ; Kjaer, N.J. (CERN) ; Kluit, P. (NIKHEF, Amsterdam) ; Kokkinias, P. (Democritos Nucl. Res. Ctr.) ; Kourkoumelis, C. (Athens U.) ; Kouznetsov, O. (Dubna, JINR) ; Krumstein, Z. (Dubna, JINR) ; Kucharczyk, M. (Cracow, INP) ; Lamsa, J. (Iowa State U.) ; Leder, G. (Vienna, OAW) ; Ledroit, F. (LPSC, Grenoble) ; Leinonen, L. (Stockholm U.) ; Leitner, R. (Charles U.) ; Lemonne, J. (Brussels U., IIHE) ; Lepeltier, V. (Orsay, LAL) ; Lesiak, T. (Cracow, INP) ; Liebig, W. (Wuppertal U.) ; Liko, D. (Vienna, OAW) ; Lipniacka, A. (Stockholm U.) ; Lopes, J.H. (Rio de Janeiro Federal U.) ; Lopez, J.M. (Oviedo U.) ; Loukas, D. (Democritos Nucl. Res. Ctr.) ; Lutz, P. (SPhN, DAPNIA, Saclay) ; Lyons, L. (Oxford U.) ; MacNaughton, J. (Vienna, OAW) ; Malek, A. (Wuppertal U.) ; Maltezos, S. (Natl. Tech. U., Athens) ; Mandl, F. (Vienna, OAW) ; Marco, J. (Cantabria Inst. of Phys.) ; Marco, R. (Cantabria Inst. of Phys.) ; Marechal, B. (Rio de Janeiro Federal U.) ; Margoni, M. (INFN, Padua) ; Marin, J-C. (CERN) ; Mariotti, C. (CERN) ; Markou, A. (Democritos Nucl. Res. Ctr.) ; Martinez-Rivero, C. (Cantabria Inst. of Phys.) ; Masik, J. (Prague, Inst. Phys.) ; Mastroyiannopoulos, N. (Democritos Nucl. Res. Ctr.) ; Matorras, F. (Cantabria Inst. of Phys.) ; Matteuzzi, C. (INFN, Milan Bicocca) ; Mazzucato, F. (INFN, Padua) ; Mazzucato, M. (INFN, Padua) ; Mc Nulty, R. (Liverpool U.) ; Meroni, C. (INFN, Milan) ; Migliore, E. (INFN, Turin) ; Mitaroff, W. (Vienna, OAW) ; Mjoernmark, U. (Lund U.) ; Moa, T. (Stockholm U.) ; Moch, M. (Karlsruhe U., EKP) ; Monig, Klaus (DESY, Zeuthen) ; Monge, R. (INFN, Genoa) ; Montenegro, J. (NIKHEF, Amsterdam) ; Moraes, D. (Rio de Janeiro Federal U.) ; Moreno, S. (Lisbon, LIFEP) ; Morettini, P. (INFN, Genoa) ; Mueller, U. (Wuppertal U.) ; Muenich, K. (Wuppertal U.) ; Mulders, M. (NIKHEF, Amsterdam) ; Mundim, L. (Rio de Janeiro State U.) ; Murray, W. (Rutherford) ; Muryn, B. (AGH-UST, Cracow) ; Myatt, G. (Oxford U.) ; Myklebust, T. (Oslo U.) ; Nassiakou, M. (Democritos Nucl. Res. Ctr.) ; Navarria, F. (INFN, Bologna) ; Nawrocki, K. (Warsaw U.) ; Nicolaidou, R. (SPhN, DAPNIA, Saclay) ; Nikolenko, M. (Strasbourg, IReS) ; Oblakowska-Mucha, A. (AGH-UST, Cracow) ; Obraztsov, V. (Serpukhov, IHEP) ; Olshevski, A. (Dubna, JINR) ; Onofre, A. (Lisbon, LIFEP) ; Orava, R. (Helsinki Inst. of Phys.) ; Osterberg, K. (Helsinki Inst. of Phys.) ; Ouraou, A. (SPhN, DAPNIA, Saclay) ; Oyanguren, A. (Valencia U.) ; Paganoni, M. (INFN, Milan Bicocca) ; Paiano, S. (INFN, Bologna) ; Palacios, J.P. (Liverpool U.) ; Palka, H. (Cracow, INP) ; Papadopoulou, Th.D. (Natl. Tech. U., Athens) ; Pape, L. (CERN) ; Parkes, C. (Glasgow U.) ; Parodi, F. (INFN, Genoa) ; Parzefall, U. (CERN) ; Passeri, A. (INFN, Rome3) ; Passon, O. (Wuppertal U.) ; Peralta, L. (Lisbon, LIFEP) ; Perepelitsa, V. (Valencia U.) ; Perrotta, A. (INFN, Bologna) ; Petrolini, A. (INFN, Genoa) ; Piedra, J. (Cantabria Inst. of Phys.) ; Pieri, L. (INFN, Rome3) ; Pierre, F. (SPhN, DAPNIA, Saclay) ; Pimenta, M. (Lisbon, LIFEP) ; Piotto, E. (CERN) ; Podobnik, T. (Ljubljana U.) ; Poireau, V. (CERN) ; Pol, M.E. (Rio de Janeiro, CBPF) ; Polok, G. (Cracow, INP) ; Pozdniakov, V. (Dubna, JINR) ; Pukhaeva, N. (Dubna, JINR) ; Pullia, A. (INFN, Milan Bicocca) ; Rames, J. (Prague, Inst. Phys.) ; Read, A. (Oslo U.) ; Rebecchi, P. (CERN) ; Rehn, J. (Karlsruhe U., EKP) ; Reid, D. (NIKHEF, Amsterdam) ; Reinhardt, R. (Wuppertal U.) ; Renton, P. (Oxford U.) ; Richard, F. (Orsay, LAL) ; Ridky, J. (Prague, Inst. Phys.) ; Rivero, M. (Cantabria Inst. of Phys.) ; Rodriguez, D. (Cantabria Inst. of Phys.) ; Romero, A. (INFN, Turin) ; Ronchese, P. (INFN, Padua) ; Roudeau, P. (Orsay, LAL) ; Rovelli, T. (INFN, Bologna) ; Ruhlmann-Kleider, V. (SPhN, DAPNIA, Saclay) ; Ryabtchikov, D. (Serpukhov, IHEP) ; Sadovsky, A. (Dubna, JINR) ; Salmi, L. (Helsinki Inst. of Phys.) ; Salt, J. (Valencia U.) ; Sander, C. (Karlsruhe U., EKP) ; Savoy-Navarro, A. (Paris U., VI-VII) ; Schwickerath, U. (CERN) ; Sekulin, R. (Rutherford) ; Siebel, M. (Wuppertal U.) ; Sisakian, A. (Dubna, JINR) ; Smadja, G. (Lyon, IPN) ; Smirnova, O. (Lund U.) ; Sokolov, A. (Serpukhov, IHEP) ; Sopczak, A. (Lancaster U.) ; Sosnowski, R. (Warsaw U.) ; Spassov, T. (CERN) ; Stanitzki, M. (Karlsruhe U., EKP) ; Stocchi, A. (Orsay, LAL) ; Strauss, J. (Vienna, OAW) ; Stugu, B. (Bergen U.) ; Szczekowski, M. (Warsaw U.) ; Szeptycka, M. (Warsaw U.) ; Szumlak, T. (AGH-UST, Cracow) ; Tabarelli, T. (INFN, Milan Bicocca) ; Tegenfeldt, F. (Lancaster U.) ; Timmermans, J. (NIKHEF, Amsterdam) ; Tkatchev, L. (Dubna, JINR) ; Tobin, M. (Liverpool U.) ; Todorovova, S. (Prague, Inst. Phys.) ; Tome, B. (Lisbon, LIFEP) ; Tonazzo, A. (INFN, Milan Bicocca) ; Tortosa, P. (Valencia U.) ; Travnicek, P. (Prague, Inst. Phys.) ; Treille, D. (CERN) ; Tristram, G. (College de France) ; Trochimczuk, M. (Warsaw U.) ; Troncon, C. (INFN, Milan) ; Turluer, M-L. (SPhN, DAPNIA, Saclay) ; Tyapkin, I.A. (Dubna, JINR) ; Tyapkin, P. (Dubna, JINR) ; Tzamarias, S. (Democritos Nucl. Res. Ctr.) ; Uvarov, V. (Serpukhov, IHEP) ; Valenti, G. (INFN, Bologna) ; Van Dam, P. (NIKHEF, Amsterdam) ; Van Eldik, J. (CERN) ; van Remortel, N. (Antwerp U.) ; Van Vulpen, I. (CERN) ; Vegni, G. (INFN, Milan) ; Veloso, F. (Lisbon, LIFEP) ; Venus, W. (Rutherford) ; Verdier, P. (Lyon, IPN) ; Verzi, V. (INFN, Rome2) ; Vilanova, D. (SPhN, DAPNIA, Saclay) ; Vitale, L. (INFN, Trieste) ; Vrba, V. (Prague, Inst. Phys.) ; Wahlen, H. (Wuppertal U.) ; Washbrook, A.J. (Liverpool U.) ; Weiser, C. (Karlsruhe U., EKP) ; Wicke, D. (CERN) ; Wickens, J. (Brussels U., IIHE) ; Wilkinson, G. (Oxford U.) ; Winter, M. (Strasbourg, IReS) ; Witek, M. (Cracow, INP) ; Yushchenko, O. (Serpukhov, IHEP) ; Zalewska, A. (Cracow, INP) ; Zalewski, P. (Warsaw U.) ; Zavrtanik, D. (Nova Gorica U.) ; Zhuravlov, V. (Dubna, JINR) ; Zimin, N.I. (Dubna, JINR) ; Zintchenko, A. (Dubna, JINR) ; Zupan, M. (Democritos Nucl. Res. Ctr.)

Published in: Eur.Phys.J.
Year: 2008
Vol.: C57
Page No: 499-514
Pages: 24

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 < 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.

Web-Page: http://inspirebeta.net/record/775920/files/fig1mu.png; http://inspirebeta.net/record/775920/files/fig2mu.png; http://inspirebeta.net/record/775920/files/fig3mu.png; http://inspirebeta.net/record/775920/files/fig4mu.png; http://inspirebeta.net/record/775920/files/fig5mu.png; http://inspirebeta.net/record/775920/files/fig6mu.png

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