Study of leading hadrons in gluon and quark fragmentation

Abdallah, J; Abreu, P; Adam, W; Adzic, P; Albrecht, T; Alemany Fernandez, R; Allmendinger, T; Allport, Pp; Amaldi, U; Amapane, N; Amato, S; Anashkin, E; Andreazza, A; Andringa, S; Anjos, N; Antilogus, P; Apel, Wd; Arnoud, Y; Ask, S; Asman, B; Augustin, Je; Augustinus, A; Baillon, P; Ballestrero, A; Bambade, P; Barbier, R; Bardin, D; Barker, Gj; Baroncelli, A; Battaglia, M; Baubillier, M; Becks, Kh; 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, Psl; Borisov, G; Botner, O; Bouquet, B; Bowcock, Tjv; Boyko, I; Bracko, M; Brenner, R; Brodet, E; Bruckman, P; Brunet, Jm; 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, Su; Cieslik, K; Collins, P; Contri, R; Cosme, G; Cossutti, F; Costa, Mj; Crennell, D; Cuevas, J; D'Hondt, J; Dalmau, J; da Silva, T; Da Silva, W; Della Ricca, G; De Angelis, Alessandro; De Boer, W; De Clercq, C; De Lotto, Barbara; De Maria, N; De Min, A; de Paula, L; Di Ciaccio, L; Di Simone, A; Doroba, K; Drees, J; Eigen, G; Ekelof, T; Ellert, M; Elsing, M; Santo, Mce; 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, G; Goncalves, P; Graziani, E; Grosdidier, G; Grzelak, K; Guy, J; Haag, C; Hallgren, A; Hamacher, K; Hamilton, K; Haug, S; Hauler, F; Hedberg, V; Hennecke, M; Herr, H; Hoffman, J; Holmgren, So; Holt, Pj; Houlden, Ma; Jackson, Jn; Jarlskog, G; Jarry, P; Jeans, D; Johansson, Ek; Johansson, Pd; Jonsson, P; Joram, C; Jungermann, L; Kapusta, F; Katsanevas, S; Katsoufis, E; Kernel, G; Kersevan, Bp; Kerzel, U; King, Bt; Kjaer, Nj; 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, Jh; Lopez, Jm; Loukas, D; Lutz, P; Lyons, L; MacNaughton, J; Malek, A; Maltezos, S; Mandl, F; Marco, J; Marco, R; Marechal, B; Margoni, M; Marin, Jc; Mariotti, C; Markou, A; Martinez Rivero, C; Masik, J; Mastroyiannopoulos, N; Matorras, F; Matteuzzi, C; Mazzucato, F; Mazzucato, M; Mc Nulty, R; Meroni, C; Migliore, E; Mitaroff, W; Mjoernmark, U; Moa, T; 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, A; Obraztsov, V; Olshevski, A; Onofre, A; Orava, R; Osterberg, K; Ouraou, A; Oyanguren, A; Paganoni, M; Paiano, S; Palacios, Jp; Palka, H; Papadopoulou, Td; 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, Me; 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, V; Ryabtchikov, D; Sadovsky, A; Salmi, L; Salt, J; Sander, C; Savoy Navarro, A; Schwickerath, U; Sekulin, R; Siebel, M; Sisakian, A; Smadja, G; Smirnova, O; 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, Ac; 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, Ml; Tyapkin, Ia; 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, Aj; Weiser, C; Wicke, D; Wickens, J; Wilkinson, G; Winter, M; Witek, M; Yushchenko, O; Zalewska, A; Zalewski, P; Zavrtanik, D; Zhuravlov, V; Zimin, Ni; Zintchenko, A; Zupan, M.

doi:10.1016/j.physletb.2006.10.040

The study of quark jets in e(+)e(-) reactions at LEP has demonstrated that the hadronisation process is reproduced well by the Lund string model. However. our understanding of gluon fragmentation is less complete. In this study enriched quark and gluon jet samples of different purities are selected in three-jet events from hadronic decays of the Z collected by the DELPHI experiment in the LEP runs during 1994 and 1995. The leading systems of the two kinds of jets are defined by requiring a rapidity gap and their sum of charges is studied. An excess of leading systems with total charge zero is found for gluon jets in all cases, when compared to Monte Carlo simulations with JETSET (with and without Bose-Einstein correlations included) and ARIADNE. The corresponding leading systems of quark jets do not exhibit such an excess. The influence of the gap size and of the gluon purity on the effect is studied and a concentration of the excess of neutral leading systems at low invariant masses (less than or similar to 2 GeV/c(2)) is observed, indicating that gluon jets might have an additional hitherto undetected fragmentation mode via a two-gluon system. This could be an indication of a possible production of gluonic states as predicted by QCD. (c) 2006 Elsevier B.V. All rights reserved.

Titolo:	Study of leading hadrons in gluon and quark fragmentation
Autori:	Abdallah J Abreu P Adam W Adzic P Albrecht T Alemany Fernandez R Allmendinger T Allport PP Amaldi U Amapane N Amato S Anashkin E Andreazza A Andringa S Anjos N Antilogus P Apel WD Arnoud Y Ask S Asman B Augustin JE Augustinus A Baillon P Ballestrero A Bambade P Barbier R Bardin D Barker GJ Baroncelli A Battaglia M Baubillier M Becks KH 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 PSL Borisov G Botner O Bouquet B Bowcock TJV Boyko I Bracko M Brenner R Brodet E Bruckman P Brunet JM 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 SU Cieslik K Collins P Contri R Cosme G Cossutti F Costa MJ Crennell D Cuevas J D'Hondt J Dalmau J da Silva T Da Silva W Della Ricca G DE ANGELIS, Alessandro De Boer W De Clercq C DE LOTTO, Barbara De Maria N De Min A de Paula L Di Ciaccio L Di Simone A Doroba K Drees J Eigen G Ekelof T Ellert M Elsing M Santo MCE 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 G Goncalves P Graziani E Grosdidier G Grzelak K Guy J Haag C Hallgren A Hamacher K Hamilton K Haug S Hauler F Hedberg V Hennecke M Herr H Hoffman J Holmgren SO Holt PJ Houlden MA Jackson JN Jarlskog G Jarry P Jeans D Johansson EK Johansson PD Jonsson P Joram C Jungermann L Kapusta F Katsanevas S Katsoufis E Kernel G Kersevan BP Kerzel U King BT Kjaer NJ 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 JH Lopez JM Loukas D Lutz P Lyons L MacNaughton J Malek A Maltezos S Mandl F Marco J Marco R Marechal B Margoni M Marin JC Mariotti C Markou A Martinez Rivero C Masik J Mastroyiannopoulos N Matorras F Matteuzzi C Mazzucato F Mazzucato M Mc Nulty R Meroni C Migliore E Mitaroff W Mjoernmark U Moa T 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 A Obraztsov V Olshevski A Onofre A Orava R Osterberg K Ouraou A Oyanguren A Paganoni M Paiano S Palacios JP Palka H Papadopoulou TD 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 ME 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 V Ryabtchikov D Sadovsky A Salmi L Salt J Sander C Savoy Navarro A Schwickerath U Sekulin R Siebel M Sisakian A Smadja G Smirnova O 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 AC 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 ML Tyapkin IA 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 AJ Weiser C Wicke D Wickens J Wilkinson G Winter M Witek M Yushchenko O Zalewska A Zalewski P Zavrtanik D Zhuravlov V Zimin NI Zintchenko A Zupan M. mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2006
Rivista:	PHYSICS LETTERS. SECTION B
Abstract:	The study of quark jets in e(+)e(-) reactions at LEP has demonstrated that the hadronisation process is reproduced well by the Lund string model. However. our understanding of gluon fragmentation is less complete. In this study enriched quark and gluon jet samples of different purities are selected in three-jet events from hadronic decays of the Z collected by the DELPHI experiment in the LEP runs during 1994 and 1995. The leading systems of the two kinds of jets are defined by requiring a rapidity gap and their sum of charges is studied. An excess of leading systems with total charge zero is found for gluon jets in all cases, when compared to Monte Carlo simulations with JETSET (with and without Bose-Einstein correlations included) and ARIADNE. The corresponding leading systems of quark jets do not exhibit such an excess. The influence of the gap size and of the gluon purity on the effect is studied and a concentration of the excess of neutral leading systems at low invariant masses (less than or similar to 2 GeV/c(2)) is observed, indicating that gluon jets might have an additional hitherto undetected fragmentation mode via a two-gluon system. This could be an indication of a possible production of gluonic states as predicted by QCD. (c) 2006 Elsevier B.V. All rights reserved.
Handle:	http://hdl.handle.net/11390/884311
Appare nelle tipologie:	1.1 Articolo in rivista

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