Title: | A direct observation of quark-gluon jet differences at LEP |
Authors: | Alexander, G Allison, J Allport, PP Anderson, KJ Arcelli, S Armitage, JC Ashton, P Astbury, A Axen, D Azuelos, G Bahan, GA Smith, TJ Snow, GA Sobie, R Springer, RW Sproston, M Bloodworth, IJ Stephens, K Stier, HE Strom, D Hochman, D Mikenberg, G Takeda, H Takeshita, T Taras, P Tarem, S Teixeira-Dias, P Thackray, NJ Tsukamoto, T Bock, P Turner, MF Tysarczyk-Niemeyer, G Mildenberger, J Holl, B Van Den Plas, D Van Kooten, R VanDalen, GJ Vasseur, G Virtue, CJ Wagner, A Wahl, C Walker, JP Bosch, HM Miller, DJ Ward, CP Baines, JTM Ward, DR Watkins, PM Watson, AT Watson, NK Weber, M Weisz, S Wells, PS Wermes, N Milstene, C Weymann, M Bougerolle, S Homer, RJ Whalley, MA Wilson, GW Wilson, JA Wingerter, I Winterer, V-H Wood, NC Wotton, S Mir, R Wyatt, TR Yaari, R Yang, Y Hou, SR Brabson, BB Yekutieli, G Zacharov, I Zeuner, W Zorn, GT Breuker, H Mohr, W Brown, RM Brun, R Buijs, A Burckhart, HJ Howarth, CP Capiluppi, P Carnegie, RK Carter, AA Carter, JR Chang, CY Moisan, C Charlton, DG Chrin, JTM Clarke, PEL Cohen, I Collins, WJ Hughes-Jones, RE Conboy, JE Cooper, M Couch, M Coupland, M Montanari, A Cuffiani, M Dado, S Dallavalle, GM De Jong, S Debu, P Deninno, MM Humbert, R Dieckmann, A Dittmar, M Dixit, MS Mori, T Duchovni, E Duckeck, G Duerdoth, IP Dumas, DJP Eckerlin, G Elcombe, PA Estabrooks, PG Igo-Kemenes, P Etzion, E Fabbri, F Becker, J Fincke-Keeler, M Fischer, HM Fong, DG Fukunaga, C Gaidot, A Ganel, O Gary, JW Gascon, J Ihssen, H McGowan, RF Hemingway, RJ Geddes, NI Geich-Gimbel, C Gensler, SW Gentit, FX Giacomelli, G Gibson, V Gibson, WR Gillies, JD Goldberg, J Imrie, DC Moss, MW Goodrick, MJ Gorn, W Grandi, C Gross, E Hagemann, J Hanson, G Hansroul, M Hargrove, CK Harrison, PF Hart, J Mouthuy, T Janissen, L Hattersley, PM Hauschild, M Hawkes, CM Heflin, E Jawahery, A Ball, AH Jeffreys, PW Jeremie, H Jimack, M Murphy, PG Jobes, M Jones, RWL Jovanovic, P Karlen, D Kawagoe, K Kawamoto, T Keeler, RK Banks, J Kellogg, RG Kennedy, BW Nellen, B Kleinwort, C Klem, DE Kobayashi, T Kokott, TP Komamiya, S Köpke, L Kowalewski, R Kreutzmann, H Barker, GJ Von Krogh, J Nguyen, HH Kroll, J Kuwano, M Kyberd, P Lafferty, GD Lamarche, F Larson, WJ Layter, JG Le Du, P Leblanc, P Barlow, RJ Nozaki, M Lee, AM Lehto, MH Lellouch, D Lennert, P Leroy, C Lessard, L Levegrun, S Levinson, L Lloyd, SL Loebinger, FK O'Neale, SW Batley, JR Lorah, JM Lorazo, B Losty, MJ Lou, XC Ludwig, J Mannelli, M Marcellini, S Maringer, G Martin, AJ O'Neill, BP Martin, JP Beaudoin, G Mashimo, T Mättig, P Maur, U McMahon, TJ McNutt, JR Meijers, F Menszner, D Merritt, FS Oakham, FG Mes, H Michelini, A Beck, A Middleton, RP Odorici, F Heuer, RD Behnke, T Ogg, M Ogren, HO Oh, H Oram, CJ Oreglia, MJ Orito, S Pansart, JP Panzer-Steindel, B Paschievici, P Hill, JC Patrick, GN Bell, KW Pawley, SJ Pfister, P Pilcher, JE Pinfold, JL Plane, DE Poffenberger, P Poli, B Pouladdej, A Hillier, SJ Prebys, E Pritchard, TW Bella, G Przysiezniak, H Quast, G Redmond, MW Rees, DL Riles, K Robins, SA Robinson, D Hinshaw, DA Rollnik, A Roney, JM Rossberg, S Bethke, S Rossi, AM Routenburg, P Runge, K Runolfsson, O Rust, DR Sanghera, S Ho, C Sasaki, M Schaile, AD Schaile, O Schappert, W Biebel, O Scharff-Hansen, P Schenk, P Von Der Schmitt, H Schreiber, S Schwarz, J Hobbs, JD Scott, WG Settles, M Shen, BC Sherwood, P Shypit, R Binder, U Simon, A Singh, P Siroli, GP Skuja, A Hobson, PR Smith, AM |
Issue Date: | 1991 |
Publisher: | Elsevier |
Citation: | Physics Letters B, 265(3-4): 462 - 474, Aug 1991 |
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. |
Description: | This is the post-print version of the Article - Copyright @ 1991 Elsevier. |
URI: | http://www.sciencedirect.com/science/article/pii/0370269391900822 http://bura.brunel.ac.uk/handle/2438/7179 |
DOI: | http://dx.doi.org/10.1016/0370-2693(91)90082-2 |
ISSN: | 0370-2693 |
Appears in Collections: | Electronic and Electrical Engineering Dept of Electronic and Electrical Engineering Research Papers
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