Evidence for an excess of soft photons in hadronic decays of Z(0)

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MARC

Abdallah, J. (author)

Evidence for an excess of soft photons in hadronic decays of Z(0)

Article/chapterEnglish2006

Publisher, publication year, extent ...

2006-05-30
Springer Science and Business Media LLC,2006

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LIBRIS-ID:oai:lup.lub.lu.se:7e7291d3-5ac8-4741-872a-4707a32e89eb
https://lup.lub.lu.se/record/382239URI
https://doi.org/10.1140/epjc/s2006-02568-8DOI
https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-12570URI
https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-25238URI

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Language:English
Summary in:English

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SwePubSwePub

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Subject category:art swepub-publicationtype
Subject category:ref swepub-contenttype

Notes

Soft photons inside hadronic jets converted in front of the DELPHI main tracker (TPC) in events of qq disintegrations of the Z(0) were studied in the kinematic range 0.2 < E-y < I GeV and transverse momentum with respect to the closest jet direction P-T < 80 MeV/c. A clear excess of photons in the experimental data as compared to the Monte Carlo predictions is observed. This excess (uncorrected for the photon detection efficiency) is (1.17 +/- 0.06 +/- 0.27) x 10(-3) gamma/jet in the specified kinematic region, while the expected level of the inner hadronic bremsstrahlung (which is not included in the Monte Carlo) is (0.340 +/- 0.001 +/- 0.038) X 10(-3) gamma/jet. The ratio of the excess to the predicted bremsstrahlung rate is then (3.4 +/- 0.2 +/- 0.8), which is similar in strength to the anomalous soft photon signal observed in fixed target experiments with hadronic beams.

Subject headings and genre

NATURVETENSKAP Fysik Subatomär fysik hsv//swe
NATURAL SCIENCES Physical Sciences Subatomic Physics hsv//eng
NATURAL SCIENCES
Elementary particle physics

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Abreu, P. (author)
Adam, W. (author)
Adzic, P. (author)
Albrecht, T. (author)
Alderweireld, T. (author)
Alemany-Fernandez, R. (author)
Allmendinger, T. (author)
Allport, P. P. (author)
Amaldi, U. (author)
Amapane, N. (author)
Amato, S. (author)
Anashkin, E. (author)
Andreazza, A. (author)
Andringa, S. (author)
Anjos, N. (author)
Antilogus, P. (author)
Apel, W-D. (author)
Arnoud, Y. (author)
Ask, StefanLund University,Lunds universitet,Partikel- och kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Particle and nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)quar-sas (author)
Åsman, BarbroStockholms universitet,Fysikum(Swepub:su)bar (author)
Augustin, J. E. (author)
Augustinus, A. (author)
Baillon, P. (author)
Ballestrero, A. (author)
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Barbier, R. (author)
Bardin, D. (author)
Jarlskog, GöranLund University,Lunds universitet,Partikel- och kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Particle and nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)quar-gja (author)
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Baubillier, M. (author)
Hultqvist, KlasStockholms universitet,Fysikum(Swepub:su)klas (author)
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Collins, P. . (author)
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da Silva, T. (author)
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Della Ricca, G. (author)
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de Paula, L. (author)
Di Ciaccio, L. (author)
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Ekelöf, TordUppsala universitet,Högenergifysik(Swepub:uu)tordeke (author)
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By the author/editor: Abdallah, J.; Abreu, P.; Adam, W.; Adzic, P.; Albrecht, T.; Alderweireld, T.; show more...; Alemany-Fernande ...; Allmendinger, T.; Allport, P. P.; Amaldi, U.; Amapane, N.; Amato, S.; Anashkin, E.; Andreazza, A.; Andringa, S.; Anjos, N.; Antilogus, P.; Apel, W-D.; Arnoud, Y.; Ask, Stefan; Åsman, Barbro; Augustin, J. E.; Augustinus, A.; Baillon, P.; Ballestrero, A.; Bambade, P.; Barbier, R.; Bardin, D.; Jarlskog, Göran; Baroncelli, A.; Battaglia, M.; Baubillier, M.; Hultqvist, Klas; Begalli, M.; Behrmann, A.; Ben-Haim, E.; Benekos, N.; Benvenuti, A.; Berat, C.; Berggren, M.; Berntzon, L.; Bertrand, D.; Besancon, M.; Besson, N.; Bloch, D.; Blom, M.; Bluj, M.; Bonesini, M.; Boonekamp, M.; Booth, P. S. L.; Borisov, G.; Botner, Olga; Bouquet, B.; Bowcock, T. J. V ...; Boyko, I.; Bracko, M.; Brenner, Richard; Brodet, E.; Bruckman, P.; Brunet, J. M.; Buschbeck, B.; Buschmann, P.; Calvi, M.; Camporesi, T.; Canale, V.; Carena, F.; Castro, N.; Cavallo, F.; Chapkin, M.; Charpentier, P.; Checchia, P.; Chierici, R.; Chliapnikov, P.; Chudoba, J.; Chung, S. U.; Cieslik, K.; Collins, P. .; Contri, R.; Cosme, G.; Cossutti, F.; Costa, M. J.; Crennell, D.; Cuevas, J.; D'Hondt, J.; Dalmau, J.; da Silva, T.; Da Silva, W.; Della Ricca, G.; De Angelis, A.; De Boer, W.; De Clercq, C.; De Lotto, B.; De Maria, N.; De Min, A.; de Paula, L.; Di Ciaccio, L.; Di Simone, A.; Doroba, K.; Drees, J.; Eigen, G.; Ekelöf, Tord; Ellert, Mattias; Elsing, M.; Santo, M. C. Esp ...; Fanourakis, G.; Fassouliotis, D.; Feindt, M.; Fernandez, J.; Ferrer, A.; Ferro, F.; Flagmeyer, U.; Foeth, H.; Fokitis, E.; Fulda-Quenzer, F ...; Fuster, J.; Gandelman, M.; Garcia, C.; Gavillet, P.; Gazis, E.; Gokieli, R.; Golob, B.; Gomez-Ceballos, ...; Goncalves, P.; Graziani, E.; Grosdidier, G.; Crzelak, K.; Guy, J.; Haag, C. .; Hallgren, Allan; Hamacher, K.; Hamilton, K.; Haug, S.; Hauler, F.; Hedberg, Vincent; Hennecke, M.; Herr, H.; Hoffman, J.; Holmgren, Sven-O ...; Holt, P. J.; Houlden, M. A.; Hultqvist, K.; Jackson, J. N.; Jarry, P.; Jeans, D.; Johansson, E. K.; Johansson, P. D.; Jonsson, P.; Joram, C.; Jungermann, L.; Kapusta, F.; Katsanevas, S.; Katsoufis, E.; Kernel, G.; Kersevan, B. P.; Kerzel, U.; King, B. T.; Kjaer, N. J.; Kluit, P.; Kokkinias, P.; Kourkoumelis, C.; Kouznetsov, O.; Krumstein, Z.; Kucharczyk, M.; Lamsa, J.; Leder, G.; Ledroit, F.; Leinonen, L.; Leitner, R.; Lemonne, J.; Lepeltier, V.; Lesiak, T.; Liebig, W.; Liko, D.; Lipniacka, A.; Lopes, J. H.; Lopez, J. M.; Loukas, D.; Lutz, P.; Lyons, L.; MacNaughton, J.; Malek, A.; Maltezos, S.; Mandl, F.; Marco, J.; Marco, R.; Marechal, B.; Margoni, M.; Marin, J-C.; Mariotti, C.; Markou, A.; Martinez-Rivero, ...; Masik, J.; Mastroyiannopoul ...; Matorras, F.; Matteuzzi, C.; Mazzucato, F.; Mazzucato, M.; Mc Nulty, R.; Meroni, C.; Migliore, E.; Mitaroff, W.; Mjörnmark, Ulf; Moa, Torbjörn; Moch, M.; Moenig, K.; Monge, R.; Montenegro, J.; Moraes, D.; Moreno, S.; Morettini, P.; Mueller, U.; Muenich, K.; Mulders, M.; Mundim, L.; Murray, W.; Muryn, B.; Myatt, G.; Myklebust, T.; Nassiakou, M.; Navarria, F.; Nawrocki, K.; Nicolaidou, R.; Nikolenko, M.; Oblakowska-Mucha ...; Obraztsov, V.; Olshevski, A.; Onofre, A.; Smirnova, Oxana; Osterberg, K.; Ouraou, A.; Oyanguren, A.; Paganoni, M.; Paiano, S.; Palacios, J. P.; Palka, H.; Papadopoulou, Th ...; Pape, L.; Parkes, C.; Parodi, F.; Parzefall, U.; Passeri, A.; Passon, O.; Peralta, L.; Perepelitsa, V.; Perrotta, A.; Petrolini, A.; Piedra, J.; Pieri, L.; Pierre, F.; Pimenta, M.; Piotto, E.; Podobnik, T.; Poireau, V.; Pol, M. E.; Polok, G.; Pozdniakov, V.; Pukhaeva, N.; Pullia, A.; Rames, J.; Read, A.; Rebecchi, P.; Rehn, J.; Reid, D.; Reinhardt, R.; Renton, P.; Richard, F.; Ridky, J.; Rivero, M.; Rodriguez, D.; Romero, A.; Ronchese, P.; Roudeau, P.; Rovelli, T.; Ruhlmann-Kleider ...; Ryabtchikov, D.; Sadovsky, A.; Salmi, L.; Salt, J.; Sander, C.; Savoy-Navarro, A ...; Schwickerath, U.; Segar, A.; Sekulin, R.; Siebel, M.; Sisakian, A.; Smadja, G.; Sokolov, A.; Sopczak, A.; Sosnowski, R.; Spassov, T.; Stanitzki, M.; Stocchi, A.; Strauss, J.; Stugu, B.; Szczekowski, M.; Szeptycka, M.; Szumlak, T.; Tabarelli, T.; Taffard, A. C.; Tegenfeldt, F.; Timmermans, J.; Tkatchev, L.; Tobin, M.; Todorovova, S.; Tome, B.; Tonazzo, A.; Tortosa, P.; Travnicek, P.; Treille, D.; Tristram, G.; Trochimczuk, M.; Troncon, C.; Turluer, M-L.; Tyapkin, I. A.; Tyapkin, P.; Tzamarias, S.; Uvarov, V.; Valenti, G.; Van Dam, P.; Van Eldik, J.; van Remortel, N.; Van Vulpen, I.; Vegni, G.; Veloso, F.; Venus, W.; Verdier, P.; Verzi, V.; Vilanova, D.; Vitale, L.; Vrba, V.; Wahlen, H.; Washbrook, A. J.; Weiser, C.; Wicke, D.; Wickens, J.; Wilkinson, G.; Winter, M.; Witek, M.; Yushchenko, O.; Zalewska, A.; Zalewski, P.; Zavrtanik, D.; Zhuravlov, V.; Zimin, N. I.; Zintchenko, A.; Zupan, M.; show less...

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