Tests of models of color reconnection and a search for glueballs using gluon jets with a rapidity gap
Tests of models of color reconnection and a search for glueballs using gluon jets with a rapidity gap
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颜色重联模型的测试以及使用具有快速间隙的胶子射流寻找胶球
DOI：
10.1140/epjc/s2004-01809-2
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
L. Živković
中科院分区：
文献类型：
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作者：
G. Abbiendi;C. Ainsley;P. Åkesson;G. Alexander;J. Allison;P. Amaral;G. Anagnostou;K. Anderson;S. Arcelli;S. Asai;D. Axen;G. Azuelos;I. Bailey;E. Barberio;R. Barlow;R. Batley;P. Bechtle;T. Behnke;K. Bell;P. Bell;G. Bella;A. Bellerive;G. Benelli;S. Bethke;O. Biebel;O. Boeriu;P. Bock;M. Boutemeur;S. Braibant;L. Brigliadori;R. Brown;K. Buesser;H. Burckhart;S. Campana;R. Carnegie;B. Caron;A. Carter;J. Carter;C. Y. Chang;D. Charlton;Á. Csilling;M. Cuffiani;S. Dado;A. DeRoeck;E. Dewolf;K. Desch;B. Dienes;M. Donkers;J. Dubbert;E. Duchovni;G. Duckeck;I. Duerdoth;E. Etzion;F. Fabbri;L. Feld;P. Ferrari;F. Fiedler;I. Fleck;M. Ford;A. Frey;A. Fürtjes;P. Gagnon;J. Gary;G. Gaycken;C. Geich;G. Giacomelli;Paolo Giacomelli;M. Giunta;J. Goldberg;E. Gross;J. Grunhaus;M. Gruwe;P. Günther;A. Gupta;C. Hajdu;M. Hamann;G. Hanson;K. Harder;A. Harel;M. Harin;M. Hauschild;C. Hawkes;R. Hawkings;R. J. Hemingway;C. Hensel;G. Herten;R. Heuer;J. Hill;K. Hoffman;D. Horvath;P. Igo;K. Ishii;H. Jérémie;P. Jovanović;T. Junk;N. Kanaya;J. Kanzaki;G. Karapetian;D. Karlen;K. Kawagoe;T. Kawamoto;R. Keeler;R. Kellogg;B. Kennedy;D. Kim;K. Klein;A. Klier;S. Kluth;Takashi Kobayashi;M. Kobel;S. Komamiya;L. Kormos;T. Krämer;P. Krieger;J. Vonkrogh;K. Kruger;T. Kuhl;M. Kupper;G. Lafferty;H. Landsman;D. Lanske;J. Layter;A. Leins;D. Lellouch;J. Letts;L. Levinson;J. Lillich;S. Lloyd;F. Loebinger;J. Lu;J. Ludwig;A. Macpherson;W. Mader;S. Marcellini;A. Martin;G. Masetti;T. Mashimo;P. Mättig;W. Mcdonald;J. Mckenna;T. Mcmahon;R. McPherson;F. Meijers;W. Menges;F. Merritt;H. Mes;A. Michelini;S. Mihara;G. Mikenberg;D. Miller;S. Moed;W. Mohr;Takashi Mori;A. Mutter;K. Nagai;I. Nakamura;H. Nanjo;H. Neal;R. Nisius;S. O'neale;A. Oh;A. Okpara;M. Oreglia;S. Orito;C. Pahl;G. Pásztor;J. Pater;G. Patrick;J. Pilcher;J. Pinfold;D. Plane;B. Poli;J. Polok;O. Pooth;M. Przybycien;A. Quadt;K. Rabbertz;C. Rembser;P. Renkel;J. Roney;S. Rosati;Y. Rozen;K. Runge;K. Sachs;T. Saeki;E. Sarkisyan;A. Schaile;O. Schaile;P. Scharff;J. Schieck;T. Schörner;M. Schröder;M. Schumacher;C. Schwick;W. Scott;R. Seuster;T. Shears;B. Shen;P. Sherwood;G. Siroli;A. Skuja;A. Smith;R. Sobie;S. Soldner;F. Spanò;A. Stahl;K. Stephens;D. Strom;R. Ströhmer;S. Tarem;M. Tasevsky;Richard J. K. Taylor;R. Teuscher;M. Thomson;E. Torrence;D. Toya;P. Tran;I. Trigger;Z. Trocsanyi;E. Tsur;M. F. Turner;I. Ueda;B. Ujvari;C. Vollmer;P. Vannerem;R. Vértesi;M. Verzocchi;H. Voss;J. Vossebeld;D. Waller;C. Ward;D. Ward;P. Watkins;A. Watson;N. Watson;P. Wells;T. Wengler;N. Wermes;D. Wetterling;G. Wilson;J. Wilson;G. Wolf;T. Wyatt;S. Yamashita;D. Zer;L. Živković
摘要。从e + e-湮灭产生的强子Z0衰变事件中选择平均能量为22 GeV、纯度为95%的胶子射流。这些射流的一个子样本被确定，在射流内粒子的快速分布中显示出一个大的间隙。在施加速度间隙要求后，胶子喷射纯度为86%。这些喷流被观察到对颜色重连的存在表现出高度的敏感性，即影响底层颜色结构的高阶QCD过程。我们使用我们的数据来测试三个QCD模型，其中包括颜色重连的模拟：一个在Ariadne Monte Carlo中，一个在Herwig Monte Carlo中，另一个由Rathsman在Pythia Monte Carlo中。我们发现Rathsman和Ariadne颜色重联模型只有在截断参数的值非常大的情况下才能描述胶子喷射的测量结果，而在这种情况下，包含Z0数据的描述会显著降低。我们得出结论，这两种模型实现的颜色重连是不可取的。Herwig颜色重联模型的信号不太清晰，我们没有得到关于该模型的明确结论。在另一项研究中，我们遵循最近的理论建议，在胶子射流的主要部分寻找胶球状物体。没有明确的证据表明这些天体存在。
Abstract.Gluon jets with a mean energy of 22 GeV and purity of 95% are selected from hadronic Z0 decay events produced in e + e- annihilations. A subsample of these jets is identified which exhibits a large gap in the rapidity distribution of particles within the jet. After imposing the requirement of a rapidity gap, the gluon jet purity is 86%. These jets are observed to demonstrate a high degree of sensitivity to the presence of color reconnection, i.e. higher order QCD processes affecting the underlying color structure. We use our data to test three QCD models which include a simulation of color reconnection: one in the Ariadne Monte Carlo, one in the Herwig Monte Carlo, and the other by Rathsman in the Pythia Monte Carlo. We find the Rathsman and Ariadne color reconnection models can describe our gluon jet measurements only if very large values are used for the cutoff parameters which serve to terminate the parton showers, and that the description of inclusive Z0 data is significantly degraded in this case. We conclude that color reconnection as implemented by these two models is disfavored. The signal from the Herwig color reconnection model is less clear and we do not obtain a definite conclusion concerning this model. In a separate study, we follow recent theoretical suggestions and search for glueball-like objects in the leading part of the gluon jets. No clear evidence is observed for these objects.