A DIRECT OBSERVATION OF QUARK-GLUON JET DIFFERENCES AT LEP

被引：81

作者：

ALEXANDER, G

机构：

[1] Department of Physics and Astronomy, Tel Aviv University, Tel Aviv

[2] Department of Physics, Schuster Laboratory, The University, Manchester

[3] Cavendish Laboratory, Cambridge

[4] Enrico Fermi Institute, Department of Physics, University of Chicago, Chicago

[5] Dipartimento di Fisica dell' Università di Bologna, INFN

[6] Department of Physics, Carleton University, Colonel By Drive, Ottawa

[7] Laboratoire de Physique Nucléaire, Université de Montréal, Montreal

[8] Department of Physics and Astronomy, University of Maryland, College Park

[9] Queen Mary and Westfield College, University of London, London

[10] Fakultät für Physik, Albert Ludwigs Universität

[11] CERN, European Organisation for Particle Physics

[12] Rutherford Appleton Laboratory, Chilton, Didcot

[13] Physikalisches Institut, Universität Heidelberg

[14] Physikalisches Institut, Universität Bonn

[15] School of Physics and Space Research, University of Barmingham, Barmingham

[16] Department of Physics, Indiana University, Swain Hall West 117, Bloomington

[17] Brunel University, Uxbridge

[18] University College London, London

[19] Department of Physics, Technion-Israel Institute of Technology, Haifa

[20] Birkbeck College, London

[21] DPhPE, CEN-Saclay

[22] Department of Physics, University of California, Riverside

[23] Centre for Research in Particle Physics, Carleton University, Ottawa

[24] Nuclear Physics Department, Weizmann Institute of Science, Rehovot

[25] International Center for Elementary Particle Physics, Department of Physics, University of Tokyo, Tokyo

[26] Kobe University, Kobe

[27] National Research Council of Canada, Herzberg Institute of Astrophysics, Ottawa

来源：

PHYSICS LETTERS B | 1991年 / 265卷 / 3-4期

基金：

加拿大自然科学与工程研究理事会; 美国国家科学基金会;

关键词：

D O I：

10.1016/0370-2693(91)90082-2

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Quark and gluon jets in e+e- three-jet events at LEP are identified using lepton tagging of quark jets, through observation of semi-leptonic charm and bottom quark decays. Events with a symmetry under transposition of the energies and directions of a quark and gluon jet are selected: these quark and gluon jets have essentially the same energy and event environment and as a consequence their properties can be compared directly. The energy of the jets which are studied is about 24.5 GeV. In the cores of the jets, gluon jets are found to yield a softer particle energy spectrum than quark jets. Gluon jets are observed to be broader than quark jets, as seen from the shape of their particle momentum spectra both in and out of the three-jet event plane. The greater width of gluon jets relative to quark jets is also visible from the shapes of their multiplicity distributions. Little difference is observed, however, between the mean value of particle multiplicity for the two jet types.

引用

页码：462 / 474

页数：13

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