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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 t...
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Lenguaje: | eng |
Publicado: |
2006
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Materias: | |
Acceso en línea: | https://dx.doi.org/10.1016/j.physletb.2006.10.040 http://cds.cern.ch/record/988610 |
_version_ | 1780911289524027392 |
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author | Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. Alemany-Fernandez, R. 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, S. Asman, B. Augustin, J.E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. Bardin, D. Barker, G.J. Baroncelli, A. Battaglia, M. Baubillier, M. Becks, K-H. 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, O. Bouquet, B. Bowcock, T.J.V. Boyko, I. Bracko, M. Brenner, R. Brodet, E. Bruckman, P. Brunet, J.M. Buschbeck, B. Buschmann, P. Calvi, M. Camporesi, T. Canale, V. Carena, F. Castro, Nuno Filipe Cavallo, F. Chapkin, M. Charpentier, Ph. 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. Ekelof, T. Ellert, M. Elsing, M. Espirito Santo, M.C. 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, Ph. Gazis, Evangelos 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, S.-O. Holt, P.J. Houlden, M.A. Jackson, John Neil Jarlskog, G. Jarry, P. Jeans, D. Johansson, Erik Karl 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, Fabienne 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, C. Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. McNulty, R. Meroni, C. Migliore, E. Mitaroff, W. Mjoernmark, U. Moa, T. Moch, M. Monig, Klaus 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, J.P. Palka, H. Papadopoulou, Th.D. 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, 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, A.C. Tegenfeldt, F. Timmermans, Jan 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, Piet 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. Zimine, N.I. Zintchenko, A. Zupan, M. |
author_facet | Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. Alemany-Fernandez, R. 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, S. Asman, B. Augustin, J.E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. Bardin, D. Barker, G.J. Baroncelli, A. Battaglia, M. Baubillier, M. Becks, K-H. 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, O. Bouquet, B. Bowcock, T.J.V. Boyko, I. Bracko, M. Brenner, R. Brodet, E. Bruckman, P. Brunet, J.M. Buschbeck, B. Buschmann, P. Calvi, M. Camporesi, T. Canale, V. Carena, F. Castro, Nuno Filipe Cavallo, F. Chapkin, M. Charpentier, Ph. 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. Ekelof, T. Ellert, M. Elsing, M. Espirito Santo, M.C. 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, Ph. Gazis, Evangelos 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, S.-O. Holt, P.J. Houlden, M.A. Jackson, John Neil Jarlskog, G. Jarry, P. Jeans, D. Johansson, Erik Karl 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, Fabienne 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, C. Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. McNulty, R. Meroni, C. Migliore, E. Mitaroff, W. Mjoernmark, U. Moa, T. Moch, M. Monig, Klaus 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, J.P. Palka, H. Papadopoulou, Th.D. 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, 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, A.C. Tegenfeldt, F. Timmermans, Jan 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, Piet 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. Zimine, N.I. Zintchenko, A. Zupan, M. |
author_sort | Abdallah, J. |
collection | CERN |
description | 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 (<~ 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. |
id | cern-988610 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2006 |
record_format | invenio |
spelling | cern-9886102023-08-09T03:41:04Zdoi:10.1016/j.physletb.2006.10.040http://cds.cern.ch/record/988610engAbdallah, J.Abreu, P.Adam, W.Adzic, P.Albrecht, T.Alemany-Fernandez, R.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, S.Asman, B.Augustin, J.E.Augustinus, A.Baillon, P.Ballestrero, A.Bambade, P.Barbier, R.Bardin, D.Barker, G.J.Baroncelli, A.Battaglia, M.Baubillier, M.Becks, K-H.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, O.Bouquet, B.Bowcock, T.J.V.Boyko, I.Bracko, M.Brenner, R.Brodet, E.Bruckman, P.Brunet, J.M.Buschbeck, B.Buschmann, P.Calvi, M.Camporesi, T.Canale, V.Carena, F.Castro, Nuno FilipeCavallo, F.Chapkin, M.Charpentier, Ph.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.Ekelof, T.Ellert, M.Elsing, M.Espirito Santo, M.C.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, Ph.Gazis, EvangelosGokieli, 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, S.-O.Holt, P.J.Houlden, M.A.Jackson, John NeilJarlskog, G.Jarry, P.Jeans, D.Johansson, Erik KarlJohansson, 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, FabienneLeinonen, 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, C.Masik, J.Mastroyiannopoulos, N.Matorras, F.Matteuzzi, C.Mazzucato, F.Mazzucato, M.McNulty, R.Meroni, C.Migliore, E.Mitaroff, W.Mjoernmark, U.Moa, T.Moch, M.Monig, KlausMonge, 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, J.P.Palka, H.Papadopoulou, Th.D.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, 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, A.C.Tegenfeldt, F.Timmermans, JanTkatchev, 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, PietVan 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.Zimine, N.I.Zintchenko, A.Zupan, M.Study of Leading Hadrons in Gluon and Quark FragmentationParticle Physics - ExperimentThe 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 (<~ 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.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 (<~ 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.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 (<~ 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.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 (<~ 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.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 (<~ 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.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 (<~ 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.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 (<~ 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.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 ( ≲2 GeV/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.hep-ex/0610031CERN-PH-EP-2006-015DELPHI-2006-006 CONF 752CERN-DELPHI-2006-006-CONF-752CERN-PH-EP-2006-015DELPHI-2006-006-CONF-752oai:cds.cern.ch:9886102006-05-10 |
spellingShingle | Particle Physics - Experiment Abdallah, J. Abreu, P. Adam, W. Adzic, P. Albrecht, T. Alemany-Fernandez, R. 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, S. Asman, B. Augustin, J.E. Augustinus, A. Baillon, P. Ballestrero, A. Bambade, P. Barbier, R. Bardin, D. Barker, G.J. Baroncelli, A. Battaglia, M. Baubillier, M. Becks, K-H. 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, O. Bouquet, B. Bowcock, T.J.V. Boyko, I. Bracko, M. Brenner, R. Brodet, E. Bruckman, P. Brunet, J.M. Buschbeck, B. Buschmann, P. Calvi, M. Camporesi, T. Canale, V. Carena, F. Castro, Nuno Filipe Cavallo, F. Chapkin, M. Charpentier, Ph. 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. Ekelof, T. Ellert, M. Elsing, M. Espirito Santo, M.C. 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, Ph. Gazis, Evangelos 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, S.-O. Holt, P.J. Houlden, M.A. Jackson, John Neil Jarlskog, G. Jarry, P. Jeans, D. Johansson, Erik Karl 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, Fabienne 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, C. Masik, J. Mastroyiannopoulos, N. Matorras, F. Matteuzzi, C. Mazzucato, F. Mazzucato, M. McNulty, R. Meroni, C. Migliore, E. Mitaroff, W. Mjoernmark, U. Moa, T. Moch, M. Monig, Klaus 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, J.P. Palka, H. Papadopoulou, Th.D. 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, 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, A.C. Tegenfeldt, F. Timmermans, Jan 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, Piet 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. Zimine, N.I. Zintchenko, A. Zupan, M. Study of Leading Hadrons in Gluon and Quark Fragmentation |
title | Study of Leading Hadrons in Gluon and Quark Fragmentation |
title_full | Study of Leading Hadrons in Gluon and Quark Fragmentation |
title_fullStr | Study of Leading Hadrons in Gluon and Quark Fragmentation |
title_full_unstemmed | Study of Leading Hadrons in Gluon and Quark Fragmentation |
title_short | Study of Leading Hadrons in Gluon and Quark Fragmentation |
title_sort | study of leading hadrons in gluon and quark fragmentation |
topic | Particle Physics - Experiment |
url | https://dx.doi.org/10.1016/j.physletb.2006.10.040 http://cds.cern.ch/record/988610 |
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smirnovao studyofleadinghadronsingluonandquarkfragmentation AT sokolova studyofleadinghadronsingluonandquarkfragmentation AT sopczaka studyofleadinghadronsingluonandquarkfragmentation AT sosnowskir studyofleadinghadronsingluonandquarkfragmentation AT spassovt studyofleadinghadronsingluonandquarkfragmentation AT stanitzkim studyofleadinghadronsingluonandquarkfragmentation AT stocchia studyofleadinghadronsingluonandquarkfragmentation AT straussj studyofleadinghadronsingluonandquarkfragmentation AT stugub studyofleadinghadronsingluonandquarkfragmentation AT szczekowskim studyofleadinghadronsingluonandquarkfragmentation AT szeptyckam studyofleadinghadronsingluonandquarkfragmentation AT szumlakt studyofleadinghadronsingluonandquarkfragmentation AT tabarellit studyofleadinghadronsingluonandquarkfragmentation AT taffardac studyofleadinghadronsingluonandquarkfragmentation AT tegenfeldtf studyofleadinghadronsingluonandquarkfragmentation AT timmermansjan studyofleadinghadronsingluonandquarkfragmentation AT tkatchevl studyofleadinghadronsingluonandquarkfragmentation AT tobinm studyofleadinghadronsingluonandquarkfragmentation AT todorovovas studyofleadinghadronsingluonandquarkfragmentation AT tomeb studyofleadinghadronsingluonandquarkfragmentation AT tonazzoa studyofleadinghadronsingluonandquarkfragmentation AT tortosap studyofleadinghadronsingluonandquarkfragmentation AT travnicekp studyofleadinghadronsingluonandquarkfragmentation AT treilled studyofleadinghadronsingluonandquarkfragmentation AT tristramg studyofleadinghadronsingluonandquarkfragmentation AT trochimczukm studyofleadinghadronsingluonandquarkfragmentation AT tronconc studyofleadinghadronsingluonandquarkfragmentation AT turluerml studyofleadinghadronsingluonandquarkfragmentation AT tyapkinia studyofleadinghadronsingluonandquarkfragmentation AT tyapkinp studyofleadinghadronsingluonandquarkfragmentation AT tzamariass studyofleadinghadronsingluonandquarkfragmentation AT uvarovv 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studyofleadinghadronsingluonandquarkfragmentation AT wicked studyofleadinghadronsingluonandquarkfragmentation AT wickensj studyofleadinghadronsingluonandquarkfragmentation AT wilkinsong studyofleadinghadronsingluonandquarkfragmentation AT winterm studyofleadinghadronsingluonandquarkfragmentation AT witekm studyofleadinghadronsingluonandquarkfragmentation AT yushchenkoo studyofleadinghadronsingluonandquarkfragmentation AT zalewskaa studyofleadinghadronsingluonandquarkfragmentation AT zalewskip studyofleadinghadronsingluonandquarkfragmentation AT zavrtanikd studyofleadinghadronsingluonandquarkfragmentation AT zhuravlovv studyofleadinghadronsingluonandquarkfragmentation AT zimineni studyofleadinghadronsingluonandquarkfragmentation AT zintchenkoa studyofleadinghadronsingluonandquarkfragmentation AT zupanm studyofleadinghadronsingluonandquarkfragmentation |