/ Experiment-HEP arXiv:1004.1587


Study of the Dependence of Direct Soft Photon Production on the Jet Characteristics in Hadronic Z^0 Decays


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) ; 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) ; McNulty, 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.) ; Nemecek, S. (Prague, Inst. Phys.) ; 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) ; Radojicic, D. (Oxford 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: 2010
Vol.: C67
Page No: 343-366
Pages: 40

Abstract: An analysis of the direct soft photon production rate as a function of the parent jet characteristics is presented, based on hadronic events collected by the DELPHI experiment at LEP1. The dependences of the photon rates on the jet kinematic characteristics (momentum, mass, etc.) and on the jet charged, neutral and total hadron multiplicities are reported. Up to a scale factor of about four, which characterizes the overall value of the soft photon excess, a similarity of the observed soft photon behaviour to that of the inner hadronic bremsstrahlung predictions is found for the momentum, mass, and jet charged multiplicity dependences. However for the dependence of the soft photon rate on the jet neutral and total hadron multiplicities a prominent difference is found for the observed soft photon signal as compared to the expected bremsstrahlung from final state hadrons. The observed linear increase of the soft photon production rate with the jet total hadron multiplicity and its strong dependence on the jet neutral multiplicity suggest that the rate is proportional to the number of quark pairs produced in the fragmentation process, with the neutral pairs being more effectively radiating than the charged ones.

Web-Page: http://inspirebeta.net/record/851373/files/depchar.png; http://inspirebeta.net/record/851373/files/depfig0.png; http://inspirebeta.net/record/851373/files/depfig1.png; http://inspirebeta.net/record/851373/files/depfig2.png; http://inspirebeta.net/record/851373/files/dephard3j.png; http://inspirebeta.net/record/851373/files/depjmas.png; http://inspirebeta.net/record/851373/files/depmom.png; http://inspirebeta.net/record/851373/files/depnet.png; http://inspirebeta.net/record/851373/files/depneu.png; http://inspirebeta.net/record/851373/files/pardep.png

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