Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 462-474 |
| Number of pages | 13 |
| Journal | Physics Letters B |
| Volume | 265 |
| Issue number | 3-4 |
| DOIs | |
| Publication status | Published - 1991 Aug 15 |
| Externally published | Yes |
ASJC Scopus subject areas
- Nuclear and High Energy Physics
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A direct observation of quark-gluon jet differences at LEP. / Alexander, G.; Allison, J.; Allport, P. P. et al.
In: Physics Letters B, Vol. 265, No. 3-4, 15.08.1991, p. 462-474.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - A direct observation of quark-gluon jet differences at LEP
AU - Alexander, G.
AU - Allison, J.
AU - Allport, P. P.
AU - Anderson, K. J.
AU - Arcelli, S.
AU - Armitage, J. C.
AU - Ashton, P.
AU - Astbury, A.
AU - Axen, D.
AU - Azuelos, G.
AU - Bahan, G. A.
AU - Baines, J. T.M.
AU - Ball, A. H.
AU - Banks, J.
AU - Barker, G. J.
AU - Barlow, R. J.
AU - Batley, J. R.
AU - Beaudoin, G.
AU - Beck, A.
AU - Becker, J.
AU - Behnke, T.
AU - Bell, K. W.
AU - Bella, G.
AU - Bethke, S.
AU - Biebel, O.
AU - Binder, U.
AU - Bloodworth, I. J.
AU - Bock, P.
AU - Bosch, H. M.
AU - Bougerolle, S.
AU - Brabson, B. B.
AU - Breuker, H.
AU - Brown, R. M.
AU - Brun, R.
AU - Buijs, A.
AU - Burckhart, H. J.
AU - Capiluppi, P.
AU - Carnegie, R. K.
AU - Carter, A. A.
AU - Carter, J. R.
AU - Chang, C. Y.
AU - Charlton, D. G.
AU - Chrin, J. T.M.
AU - Clarke, P. E.L.
AU - Cohen, I.
AU - Collins, W. J.
AU - Conboy, J. E.
AU - Cooper, M.
AU - Couch, M.
AU - Coupland, M.
AU - Cuffiani, M.
AU - Dado, S.
AU - Dallavalle, G. M.
AU - De Jong, S.
AU - Debu, P.
AU - Deninno, M. M.
AU - Dieckmann, A.
AU - Dittmar, M.
AU - Dixit, M. S.
AU - Duchovni, E.
AU - Duckeck, G.
AU - Duerdoth, I. P.
AU - Dumas, D. J.P.
AU - Eckerlin, G.
AU - Elcombe, P. A.
AU - Estabrooks, P. G.
AU - Etzion, E.
AU - Fabbri, F.
AU - Fincke-Keeler, M.
AU - Fischer, H. M.
AU - Fong, D. G.
AU - Fukunaga, C.
AU - Gaidot, A.
AU - Ganel, O.
AU - Gary, J. W.
AU - Gascon, J.
AU - McGowan, R. F.
AU - Geddes, N. I.
AU - Geich-Gimbel, C.
AU - Gensler, S. W.
AU - Gensler, S. W.
AU - Gentit, F. X.
AU - Giacomelli, G.
AU - Gibson, V.
AU - Gibson, W. R.
AU - Gillies, J. D.
AU - Goldberg, J.
AU - Goodrick, M. J.
AU - Gorn, W.
AU - Grandi, C.
AU - Gross, E.
AU - Hagemann, J.
AU - Hanson, G. G.
AU - Hansroul, M.
AU - Hargrove, C. K.
AU - Harrison, P. F.
AU - Hart, J.
AU - Hattersley, P. M.
AU - Hauschild, M.
AU - Hawkes, C. M.
AU - Heflin, E.
AU - Hemingway, R. J.
AU - Heuer, R. D.
AU - Hill, J. C.
AU - Hillier, S. J.
AU - Hinshaw, D. A.
AU - Ho, C.
AU - Hobbs, J. D.
AU - Hobson, P. R.
AU - Hochman, D.
AU - Holl, B.
AU - Homer, R. J.
AU - Hou, S. R.
AU - Howarth, C. P.
AU - Hughes-Jones, R. E.
AU - Humbert, R.
AU - Igo-Kemenes, P.
AU - Ihssen, H.
AU - Imrie, D. C.
AU - Janissen, L.
AU - Jawahery, A.
AU - Jeffreys, P. W.
AU - Jeremie, H.
AU - Jimack, M.
AU - Jobes, M.
AU - Jones, R. W.L.
AU - Jovanovic, P.
AU - Karlen, D.
AU - Kawagoe, K.
AU - Kawamoto, T.
AU - Keeler, R. K.
AU - Kellogg, R. G.
AU - Kennedy, B. W.
AU - Kleinwort, C.
AU - Klem, D. E.
AU - Kobayashi, T.
AU - Kokott, T. P.
AU - Komamiya, S.
AU - Köpke, L.
AU - Kowalewski, R.
AU - Kreutzmann, H.
AU - von Krogh, J.
AU - Kroll, J.
AU - Kuwano, M.
AU - Kyberd, P.
AU - Lafferty, G. D.
AU - Lamarche, F.
AU - Larson, W. J.
AU - Layter, J. G.
AU - Le Du, P.
AU - Leblanc, P.
AU - Lee, A. M.
AU - Lehto, M. H.
AU - Lellouch, D.
AU - Lennert, P.
AU - Leroy, C.
AU - Lessard, L.
AU - Levegrün, S.
AU - Levinson, L.
AU - Lloyd, S. L.
AU - Loebinger, F. K.
AU - Lorah, J. M.
AU - Lorazo, B.
AU - Losty, M. J.
AU - Lou, X. C.
AU - Ludwig, J.
AU - Mannelli, M.
AU - Marcellini, S.
AU - Maringer, G.
AU - Martin, A. J.
AU - Martin, J. P.
AU - Mashimo, T.
AU - Mättig, P.
AU - Maur, U.
AU - McMahon, T. J.
AU - McNutt, J. R.
AU - Meijers, F.
AU - Menszner, D.
AU - Merritt, F. S.
AU - Mes, H.
AU - Michelini, A.
AU - Middleton, R. P.
AU - Mikenberg, G.
AU - Mildenberger, J.
AU - Miller, D. J.
AU - Milstene, C.
AU - Mir, R.
AU - Mohr, W.
AU - Moisan, C.
AU - Montanari, A.
AU - Mori, T.
AU - Moss, M. W.
AU - Mouthuy, T.
AU - Murphy, P. G.
AU - Nellen, B.
AU - Nguyen, H. H.
AU - Nozaki, M.
AU - O'Neale, S. W.
AU - O'Neill, B. P.
AU - Oakham, F. G.
AU - Odorici, F.
AU - Ogg, M.
AU - Ogren, H. O.
AU - Oh, H.
AU - Oram, C. J.
AU - Oreglia, M. J.
AU - Orito, S.
AU - Pansart, J. P.
AU - Panzer-Steindel, B.
AU - Paschievici, P.
AU - Patrick, G. N.
AU - Pawley, S. J.
AU - Pfister, P.
AU - Pilcher, J. E.
AU - Pinfold, J. L.
AU - Plane, D. E.
AU - Poffenberger, P.
AU - Poli, B.
AU - Pouladdej, A.
AU - Prebys, E.
AU - Pritchard, T. W.
AU - Przysiezniak, H.
AU - Quast, G.
AU - Redmond, M. W.
AU - Rees, D. L.
AU - Riles, K.
AU - Robins, S. A.
AU - Robinson, D.
AU - Rollnik, A.
AU - Roney, J. M.
AU - Rossberg, S.
AU - Rossi, A. M.
AU - Routenburg, P.
AU - Runge, K.
AU - Runolfsson, O.
AU - Rust, D. R.
AU - Sanghera, S.
AU - Sasaki, M.
AU - Schaile, A. D.
AU - Schaile, O.
AU - Schappert, W.
AU - Scharff-Hansen, P.
AU - Schenk, P.
AU - von der Schmitt, H.
AU - Schreiber, S.
AU - Schwarz, J.
AU - Scott, W. G.
AU - Settles, M.
AU - Shen, B. C.
AU - Sherwood, P.
AU - Shypit, R.
AU - Simon, A.
AU - Siroli, G. P.
AU - Skuja, A.
AU - Smith, A. M.
AU - Smith, T. J.
AU - Snow, G. A.
AU - Sobie, R.
AU - Springer, R. W.
AU - Sproston, M.
AU - Stephens, K.
AU - Stier, H. E.
AU - Strom, D.
AU - Takeda, H.
AU - Takeshita, T.
AU - Taras, P.
AU - Tarem, S.
AU - Teixeira-Dias, P.
AU - Thackray, N. J.
AU - Tsukamoto, T.
AU - Turner, M. F.
AU - Tysarczyk-Niemeyer, G.
AU - Van den plas, D.
AU - Van Kooten, R.
AU - VanDalen, G. J.
AU - Vasseur, G.
AU - Virtue, C. J.
AU - Wagner, A.
AU - Wahl, C.
AU - Walker, J. P.
AU - Ward, C. P.
AU - Ward, D. R.
AU - Watkins, P. M.
AU - Watson, A. T.
AU - Watson, N. K.
AU - Weber, M.
AU - Weisz, S.
AU - Wells, P. S.
AU - Wermes, N.
AU - Weymann, M.
AU - Whalley, M. A.
AU - Wilson, G. W.
AU - Wilson, J. A.
AU - Wingerter, I.
AU - Winterer, V. H.
AU - Wood, N. C.
AU - Wotton, S.
AU - Wyatt, T. R.
AU - Yaari, R.
AU - Yang, Y.
AU - Yekutieli, G.
AU - Zacharov, I.
AU - Zeuner, W.
AU - Zorn, G. T.
N1 - Funding Information: We thank Kyuzo Teshima for helpful remarks. It is a pleasure to thank the SL Division for the efficient operation of the LEP accelerator and their continuing close cooperation with our experimental group. In addition to the support staff at our own institutions we are pleased to acknowledge the following: Department of Energy, USA, National Science Foundation, USA, Science and Engineering Research Council, UK, Natural Sciences and Engineering Research Council,Canada, Israeli Ministry of Science, Minerva Gesellschaft, The Japanese Ministry of Education, Science and Culture (the Monbusho) and a grant under the Monbusho International Science Research Program, American Israeli Bi-national Science Foundation, Direction des Sciences de la Mati6re du Commissariat l'Energie Atomique, France, Bundesministerium for Forschung und Technologie, FRG, and the A.P. Sloan Foundation.
PY - 1991/8/15
Y1 - 1991/8/15
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0000252637&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0000252637&partnerID=8YFLogxK
U2 - 10.1016/0370-2693(91)90082-2
DO - 10.1016/0370-2693(91)90082-2
M3 - Article
AN - SCOPUS:0000252637
VL - 265
SP - 462
EP - 474
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
SN - 0370-2693
IS - 3-4
ER -