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Coherent soft particle production in Z decays into three jets

J. Abdallah 1 P. Abreu W. Adam P. Adzic T. Albrecht T. Alderweireld R. Alemany-Fernandez T. Allmendinger P. Allport U. Amaldi N. Amapane S. Amato E. Anashkin A. Andreazza S. Andringa N. Anjos P. Antilogus 1 W.-D. Apel Y. Arnoud 2 S. Ask B. Asman J.-E. Augustin 1 A. Augustinus P. Baillon A. Ballestrero P. Bambade 3 R. Barbier 4 D. Bardin G.J. Barker A. Baroncelli M. Battaglia M. Baubillier 1 K.-H. Becks M. Begalli A. Behrmann E. Ben-Haim 1, 3 N. Benekos A. Benvenuti C. Berat 2 M. Berggren 1 L. Berntzon D. Bertrand M. Besancon N. Besson D. Bloch 5 M. Blom M. Bluj M. Bonesini M. Boonekamp P.S.L. Booth G. Borisov O. Botner B. Bouquet 3 V. Bowcock I. Boyko M. Bracko R. Brenner E. Brodet P. Bruckman J.-M. Brunet 6 L. Bugge P. Buschmann M. Calvi T. Camporesi V. Canale F. Carena N. Castro F. Cavallo M. Chapkin Ph. Charpentier P. Checchia R. Chierici P. Chliapnikov J. Chudoba U. Chung K. Cieslik P. Collins R. Contri G. Cosme 3 F. Cossutti M.J. Costa D. Crennell J. Cuevas J. Dalmau T.Da Silva W. da Silva 1 G. Della Ricca A. de Angelis W. de Boer C. de Clercq B. de Lotto N. de Maria A. de Min L. de Paula L. Di Ciaccio A. Di Simone K. Doroba J. Drees M. Dris G. Eigen T. Ekelof M. Ellert M. Elsing C. Espirito Santo G. Fanourakis D. Fassouliotis M. Feindt J. Fernandez A. Ferrer F. Ferro U. Flagmeyer H. Foeth E. Fokitis F. Fulda-Quenzer 3 J. Fuster M. Gandelman G. Garcia Ph. Gavillet E. Gazis R. Gokieli B. Golob G. Gomez-Ceballos P. Goncalves E. Graziani G. Grosdidier 3 K. Grzelak J. Guy C. Haag A. Hallgren K. Hamacher K. Hamilton S. Haug F. Hauler V. Hedberg M. Hennecke H. Herr Jakobus Hoffman S.-O. Holmgren J. Holt A. Houlden K. Hultqvist J.N. Jackson G. Jarlskog P. Jarry D. Jeans E.K. Johansson P.D. Johansson P. Jonsson 4 C. Joram L. Jungermann F. Kapusta 1 S. Katsanevas 4 E. Katsoufis G. Kernel P. Kersevan U. Kerzel A. Kiiskinen T. King J. Kjaer P. Kluit P. Kokkinias C. Kourkoumelis O. Kouznetsov Z. Krumstein M. Kucharczyk J. Lamsa G. Leder F. Ledroit 2 L. Leinonen R. Leitner J. Lemonne V. Lepeltier 3 T. Lesiak W. Liebig D. Liko A. Lipniacka J.H. Lopes J.M. Lopez D. Loukas P. Lutz L. Lyons J. Macnaughton A. Malek S. Maltezos F. Mandl J. Marco R. Marco B. Marechal M. Margoni J.-C. Marin C. Mariotti A. Markou C. Martinez-Rivero J. Masik N. Mastroyiannopoulos F. Matorras C. Matteuzzi F. Mazzucato M. Mazzucato R. Mc Nulty C. Meroni E. Migliore W. Mitaroff U. Mjoernmark T. Moa M. Moch K. Moenig R. Monge J. Montenegro D. Moraes S. Moreno P. Morettini U. Mueller K. Muenich M. Mulders L. Mundim W. Murray B. Muryn G. Myatt T. Myklebust M. Nassiakou F. Navarria K. Nawrocki R. Nicolaidou M. Nikolenko 5 A. Oblakowska-Mucha V. Obraztsov A. Olshevski A. Onofre R. Orava K. Osterberg A. Ouraou A. Oyanguren M. Paganoni S. Paiano J.P. Palacios H. Palka Th.D. Papadopoulou L. Pape C. Parkes F. Parodi U. Parzefall A. Passeri O. Passon L. Peralta V. Perepelitsa A. Perrotta A. Petrolini J. Piedra L. Pieri F. Pierre M. Pimenta E. Piotto T. Podobnik V. Poireau M.E. Pol G. Polok P. Poropat V. Pozdniakov N. Pukhaeva A. Pullia J. Rames L. Ramler A. Read P. Rebecchi J. Rehn D. Reid R. Reinhardt P. Renton F. Richard 3 J. Ridky M. Rivero D. Rodriguez A. Romero P. Ronchese P. Roudeau 3 T. Rovelli V. Ruhlmann-Kleider D. Ryabtchikov A. Sadovsky L. Salmi J. Salt A. Savoy-Navarro 1 U. Schwickerath A. Segar R. Sekulin M. Siebel A. Sisakian G. Smadja 4 O. Smirnova A. Sokolov A. Sopczak R. Sosnowski T. Spassov M. Stanitzki A. Stocchi 3 J. Strauss B. Stugu M. Szczekowski M. Szeptycka T. Szumlak T. Tabarelli C. Taffard F. Tegenfeldt J. Timmermans L. Tkatchev M. Tobin S. Todorovova B. Tome A. Tonazzo Pablo Tortosa P. Travnicek D. Treille G. Tristram 6 M. Trochimczuk C. Troncon M.-L. Turluer A. Tyapkin P. Tyapkin S. Tzamarias V. Uvarov G. Valenti P. van Dam J. van Eldik A. van Lysebetten N. van Remortel I. van Vulpen G. Vegni F. Veloso W. Venus P. Verdier 4 V. Verzi D. Vilanova L. Vitale V. Vrba H. Wahlen J. Washbrook C. Weiser D. Wicke J. Wickens G. Wilkinson M. Winter 5 M. Witek O. Yushchenko A. Zalewska P. Zalewski D. Zavrtanik V. Zhuravlov I. Zimin A. Zintchenko M. Zupan
Abstract : Low-energy particle production perpendicular to the event plane in three-jet events produced in Z decays in e+e- annihilation is measured and compared to that perpendicular to the event axis in two-jet events. The topology dependence of the hadron production ratio is found to agree with a leading-order QCD prediction. This agreement and especially the need for the presence of a destructive interference term gives evidence for the coherent nature of gluon radiation. Hadron production in three-jet events is found to be directly proportional to a single topological scale function of the inter-jet angles. The slope of the dependence of the multiplicity with respect to the topological scale was measured to be: 2.211 +/- 0.014 (stat.) +/- 0.053 (syst.) in good agreement with the expectation given by the colour-factor ratio C_A / C_F = 9/4. This result strongly supports the assumption of local parton-hadron duality, LPHD, at low hadron momentum.
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Submitted on : Friday, November 19, 2004 - 9:49:00 AM
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J. Abdallah, P. Abreu, W. Adam, P. Adzic, T. Albrecht, et al.. Coherent soft particle production in Z decays into three jets. Physics Letters B, Elsevier, 2005, 605, pp.37-48. ⟨10.1016/j.physletb.2004.10.059⟩. ⟨in2p3-00023321⟩

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