Study of leading hadrons in gluon and quark fragmentation

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ID: 268029
2006
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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 (≲2GeV/c2) 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.
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Authors J. Abdallah,P. Abreu,W. Adam,P. Adzic,T. Albrecht,R. Alemany-Fernandez,T. Allmendinger,P.P. Allport,U. Amaldi,N. Amapane,S. Amato,E. Anashkin,A. Andreazza,S. Andringa,N. Anjos,P. Antilogus,W.-D. Apel,Y. Arnoud,S. Ask,B. Asman,J.E. Augustin,A. Augustinus,P. Baillon,A. Ballestrero,P. Bambade,R. Barbier,D. Bardin,G.J. Barker,A. Baroncelli,M. Battaglia,M. Baubillier,K.-H. Becks,M. Begalli,A. Behrmann,E. Ben-Haim,N. Benekos,A. Benvenuti,C. Berat,M. Berggren,L. Berntzon,D. Bertrand,M. Besancon,N. Besson,D. Bloch,M. Blom,M. Bluj,Maurizio Bonesini,M. Boonekamp,P.S.L. Booth,G. Borisov,O. Botner,B. Bouquet,Themistocles Bowcock,I. Boyko,M. Bracko,R. Brenner,E. Brodet,P. Bruckman,J.M. Brunet,B. Buschbeck,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,S.U. Chung,K. Cieslik,P. Collins,R. Contri,G. Cosme,F. Cossutti,M.J. Costa,D. Crennell,J. Cuevas,J. D'Hondt,J. Dalmau,T. Da Silva,Giuseppe 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,G. Eigen,T. Ekelof,M. Ellert,M. Elsing,M.C. Espirito Santo,G. Fanourakis,D. Fassouliotis,M. Feindt,J. Fernandez,A. Ferrer,F. Ferro,U. Flagmeyer,H. Foeth,E. Fokitis,F. Fulda-Quenzer,J. Fuster,M. Gandelman,C. Garcia,Ph. Gavillet,E. Gazis,R. Gokieli,B. Golob,G. Gomez-Ceballos,P. Goncalves,E. Graziani,G. Grosdidier,K. Grzelak,J. Guy,C. Haag,A. Hallgren,K. Hamacher,K. Hamilton,S. Haug,F. Hauler,V. Hedberg,M. Hennecke,H. Herr,J. Hoffman,S.-O. Holmgren,P.J. Holt,M.A. Houlden,J.N. Jackson,G. Jarlskog,P. Jarry,D. Jeans,E.K. Johansson,P.D. Johansson,P. Jonsson,C. Joram,L. Jungermann,F. Kapusta,S. Katsanevas,E. Katsoufis,G. Kernel,B.P. Kersevan,U. Kerzel,B.T. King,N.J. Kjaer,P. Kluit,P. Kokkinias,C. Kourkoumelis,O. Kouznetsov,Z. Krumstein,M. Kucharczyk,J. Lamsa,G. Leder,F. Ledroit,L. Leinonen,R. Leitner,J. Lemonne,V. Lepeltier,Tadeusz 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,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,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,Mario Pimenta,E. Piotto,T. Podobnik,V. Poireau,M.E. Pol,G. Polok,V. Pozdniakov,N. Pukhaeva,A. Pullia,J. Rames,A. Read,P. Rebecchi,J. Rehn,D. Reid,R. Reinhardt,P. Renton,F. Richard,J. Ridky,M. Rivero,D. Rodriguez,A. Romero,P. Ronchese,P. Roudeau,T. Rovelli,V. Ruhlmann-Kleider,D. Ryabtchikov,A. Sadovsky,L. Salmi,J. Salt,C. Sander,A. Savoy-Navarro,U. Schwickerath,R. Sekulin,M. Siebel,A. Sisakian,G. Smadja,O. Smirnova,A. Sokolov,A. Sopczak,R. Sosnowski,T. Spassov,M. Stanitzki,A. Stocchi,J. Strauss,B. Stugu,M. Szczekowski,M. Szeptycka,T. Szumlak,T. Tabarelli,A.C. Taffard,F. Tegenfeldt,J. Timmermans,L. Tkatchev,M. Tobin,S. Todorovova,B. Tome,A. Tonazzo,P. Tortosa,P. Travnicek,D. Treille,G. Tristram,M. Trochimczuk,C. Troncon,M.-L. Turluer,I.A. Tyapkin,P. Tyapkin,S. Tzamarias,V. Uvarov,G. Valenti,P. Van Dam,J. Van Eldik,N. Van Remortel,I. Van Vulpen,G. Vegni,F. Veloso,W. Venus,Patrice Verdier,V. Verzi,D. Vilanova,L. Vitale,V. Vrba,H. Wahlen,A.J. Washbrook,C. Weiser,D. Wicke,J. Wickens,G. Wilkinson,M. Winter,Mariusz Witek,O. Yushchenko,A. Zalewska,Piotr Zalewski,D. Zavrtanik,V. Zhuravlov,N.I. Zimin,A. Zintchenko,M. Zupan;J. Abdallah;P. Abreu;W. Adam;P. Adzic;T. Albrecht;R. Alemany-Fernandez;T. Allmendinger;P.P. Allport;U. Amaldi;N. Amapane;S. Amato;E. Anashkin;A. Andreazza;S. Andringa;N. Anjos;P. Antilogus;W.-D. Apel;Y. Arnoud;S. Ask;B. Asman;J.E. Augustin;A. Augustinus;P. Baillon;A. Ballestrero;P. Bambade;R. Barbier;D. Bardin;G.J. Barker;A. Baroncelli;M. Battaglia;M. Baubillier;K.-H. Becks;M. Begalli;A. Behrmann;E. Ben-Haim;N. Benekos;A. Benvenuti;C. Berat;M. Berggren;L. Berntzon;D. Bertrand;M. Besancon;N. Besson;D. Bloch;M. Blom;M. Bluj;Maurizio Bonesini;M. Boonekamp;P.S.L. Booth;G. Borisov;O. Botner;B. Bouquet;Themistocles Bowcock;I. Boyko;M. Bracko;R. Brenner;E. Brodet;P. Bruckman;J.M. Brunet;B. Buschbeck;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;S.U. Chung;K. Cieslik;P. Collins;R. Contri;G. Cosme;F. Cossutti;M.J. Costa;D. Crennell;J. Cuevas;J. D'Hondt;J. Dalmau;T. Da Silva;Giuseppe 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;G. Eigen;T. Ekelof;M. Ellert;M. Elsing;M.C. Espirito Santo;G. Fanourakis;D. Fassouliotis;M. Feindt;J. Fernandez;A. Ferrer;F. Ferro;U. Flagmeyer;H. Foeth;E. Fokitis;F. Fulda-Quenzer;J. Fuster;M. Gandelman;C. Garcia;Ph. Gavillet;E. Gazis;R. Gokieli;B. Golob;G. Gomez-Ceballos;P. Goncalves;E. Graziani;G. Grosdidier;K. Grzelak;J. Guy;C. Haag;A. Hallgren;K. Hamacher;K. Hamilton;S. Haug;F. Hauler;V. Hedberg;M. Hennecke;H. Herr;J. Hoffman;S.-O. Holmgren;P.J. Holt;M.A. Houlden;J.N. Jackson;G. Jarlskog;P. Jarry;D. Jeans;E.K. Johansson;P.D. Johansson;P. Jonsson;C. Joram;L. Jungermann;F. Kapusta;S. Katsanevas;E. Katsoufis;G. Kernel;B.P. Kersevan;U. Kerzel;B.T. King;N.J. Kjaer;P. Kluit;P. Kokkinias;C. Kourkoumelis;O. Kouznetsov;Z. Krumstein;M. Kucharczyk;J. Lamsa;G. Leder;F. Ledroit;L. Leinonen;R. Leitner;J. Lemonne;V. Lepeltier;Tadeusz 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;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;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;Mario Pimenta;E. Piotto;T. Podobnik;V. Poireau;M.E. Pol;G. Polok;V. Pozdniakov;N. Pukhaeva;A. Pullia;J. Rames;A. Read;P. Rebecchi;J. Rehn;D. Reid;R. Reinhardt;P. Renton;F. Richard;J. Ridky;M. Rivero;D. Rodriguez;A. Romero;P. Ronchese;P. Roudeau;T. Rovelli;V. Ruhlmann-Kleider;D. Ryabtchikov;A. Sadovsky;L. Salmi;J. Salt;C. Sander;A. Savoy-Navarro;U. Schwickerath;R. Sekulin;M. Siebel;A. Sisakian;G. Smadja;O. Smirnova;A. Sokolov;A. Sopczak;R. Sosnowski;T. Spassov;M. Stanitzki;A. Stocchi;J. Strauss;B. Stugu;M. Szczekowski;M. Szeptycka;T. Szumlak;T. Tabarelli;A.C. Taffard;F. Tegenfeldt;J. Timmermans;L. Tkatchev;M. Tobin;S. Todorovova;B. Tome;A. Tonazzo;P. Tortosa;P. Travnicek;D. Treille;G. Tristram;M. Trochimczuk;C. Troncon;M.-L. Turluer;I.A. Tyapkin;P. Tyapkin;S. Tzamarias;V. Uvarov;G. Valenti;P. Van Dam;J. Van Eldik;N. Van Remortel;I. Van Vulpen;G. Vegni;F. Veloso;W. Venus;Patrice Verdier;V. Verzi;D. Vilanova;L. Vitale;V. Vrba;H. Wahlen;A.J. Washbrook;C. Weiser;D. Wicke;J. Wickens;G. Wilkinson;M. Winter;Mariusz Witek;O. Yushchenko;A. Zalewska;Piotr Zalewski;D. Zavrtanik;V. Zhuravlov;N.I. Zimin;A. Zintchenko;M. Zupan;
Journal physics letters b
Year 2006
DOI
10.1016/j.physletb.2006.10.040
URL
https://sciprofiles.com/publication/view/09f0029393fd6d08b32cc420f54b3b39
Keywords
model gap charges hadronic lep jets quark purity gluon leading systems

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