Study of leading hadrons in gluon and quark fragmentation

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.

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 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; 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. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 643:3-4(2006), pp. 147-157.



Titolo: Study of leading hadrons in gluon and quark fragmentation
Autori: 
DE ANGELIS, Alessandro
DE LOTTO, Barbara
mostra contributor esterni 
Data di pubblicazione: 2006
Rivista: 
PHYSICS LETTERS. SECTION B  
Citazione: 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 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; 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. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 643:3-4(2006), pp. 147-157.
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
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