Please use this identifier to cite or link to this item: http://buratest.brunel.ac.uk/handle/2438/9604
Title: A measurement of the electroweak couplings of up and down type quarks using final state photons in hadronic Z0 decays
Authors: Alexander, G
Allison, J
Allport, PP
Anderson, KJ
Arcelli, S
Armitage, JC
Ashton, P
Astbury, A
Axen, D
Azuelos, G
Bahan, GA
Gibson, V
Ball, AH
O'Neale, SW
VanDalen, GJ
Panzer-Steindel, B
Weisz, S
Markus, C
Hill, JC
Virtue, CJ
Karlen, D
Wells, PS
Bella, G
Taras, P
Weymann, M
Robins, SA
Biebel, O
Paschievici, P
Bell, KW
Shypit, R
Patrick, GN
Hanson, GG
Brown, RM
Schwarz, J
Scott, WG
Jeffreys, PW
Vasseur, G
Yaari, R
Runge, K
Pawley, SJ
Sasaki, M
Deninno, MM
Simon, A
Imrie, DC
Larson, WJ
Kreutzmann, H
Fabbri, F
Miller, DJ
Pfister, P
Jeremie, H
Cuffiani, M
Teixeira-Dias, P
Hou, SR
Thackray, NJ
Oh, H
Köpke, L
Yang, Y
Dittmar, M
Wilson, GW
Capiluppi, P
Settles, M
Duchovni, E
Runolfsson, O
Smith, AM
Rust, DR
Keeler, RK
Wagner, A
Hochman, D
Brabson, BB
Hughes-Jones, RE
Singh, P
Ho, C
Turner, MF
Gibson, WR
Beaudoin, G
Hansroul, M
Poffenberger, P
Sanghera, S
Lee, AM
Gensler, SW
Wingerter, I
Kyberd, P
Winterer, V-H
Lou, XC
Carter, AA
Fincke-Keeler, M
Wahl, C
Goldberg, J
Siroli, GP
Watson, AT
Hobson, PR
Yekutieli, G
Kroll, J
Elcombe, PA
Nellen, B
Milstene, C
Jimack, M
Debu, P
Banks, J
Skuja, A
Mannelli, M
Heuer, RD
Bock, P
Fischer, HM
Bosch, HM
Giacomelli, G
Von Der Schmitt, H
Mildenberger, J
Fukunaga, C
Oreglia, MJ
Homer, RJ
Duckeck, G
Gillies, JD
Wood, NC
Howarth, CP
Walker, JP
Baines, JTM
Cohen, I
Ward, CP
Maur, U
Carter, JR
Chang, CY
Behnke, T
Fong, DG
Hargrove, CK
Zacharov, I
Ward, DR
Breuker, H
Von Krogh, J
Collins, WJ
Redmond, MW
Poli, B
Lehto, MH
Sobie, R
Watkins, PM
Odorici, F
Komamiya, S
Dumas, DJP
Moss, MW
Eckerlin, G
Plane, DE
Harrison, PF
Kuwano, M
Goodrick, MJ
Jobes, M
Charlton, DG
Lafferty, GD
Zeuner, W
Coupland, M
Zorn, GT
Gaidot, A
Montanari, A
Janissen, L
Murphy, PG
Conboy, JE
Mir, R
Estabrooks, PG
Marcellini, S
Hobbs, JD
McMahon, TJ
OPAL Collaboration
Robinson, D
Losty, MJ
Grandi, C
Pritchard, TW
Gross, E
Schaile, O
Jovanovic, P
Lellouch, D
Ganel, O
Cooper, M
Geich-Gimbel, C
Moisan, C
Hart, J
Prebys, E
Leblanc, P
Tarem, S
Springer, RW
Ogg, M
Barker, GJ
Couch, M
Schappert, W
Mikenberg, G
Igo-Kemenes, P
Lennert, P
Ihssen, H
Ludwig, J
Carnegie, RK
Snow, GA
Lessard, L
Mori, T
Lamarche, F
Maringer, G
Hagemann, J
Mouthuy, T
Gary, JW
Hemingway, RJ
Kellogg, RG
Gascon, J
Shen, BC
Kawagoe, K
Holl, B
Leroy, C
McNutt, JR
Hattersley, PM
McGowan, RF
Jawahery, A
Pouladdej, A
Kennedy, BW
Wilson, JA
Rollnik, A
Dallavalle, GM
Geddes, NI
Tysarczyk-Niemeyer, G
Pinfold, JL
Layter, JG
Takeda, H
Le Du, P
Weber, M
Meijers, F
Martin, AJ
Ogren, HO
Kawamoto, T
Przysiezniak, H
Hauschild, M
Kokott, TP
Hawkes, CM
Levegrün, S
Stier, HE
O'Neill, BP
Kleinwort, C
Bloodworth, IJ
Barlow, RJ
Scharff-Hansen, P
Mohr, W
Sherwood, P
Heflin, E
Wotton, S
Schaile, AD
Martin, JP
Mashimo, T
Brun, R
Oram, CJ
Roney, JM
Levinson, L
Klem, DE
Lorazo, B
Stephens, K
Menszner, D
Bougerolle, S
Duerdoth, IP
De Jong, S
Van Den Plas, D
Hillier, SJ
Kobayashi, T
Buijs, A
Smith, TJ
Nguyen, HH
Bethke, S
Nozaki, M
Jones, RWL
Dado, S
Rossi, AM
Strom, D
Quast, G
Schenk, P
Mättig, P
Takeshita, T
Lloyd, SL
Middleton, RP
Loebinger, FK
Chrin, JTM
Orito, S
Becker, J
Rossberg, S
Binder, U
Merritt, FS
Batley, JR
Oakham, FG
Wermes, N
Gorn, W
Wyatt, TR
Kowalewski, R
Lorah, JM
Etzion, E
Watson, NK
Rees, DL
Dixit, MS
Riles, K
Gentit, FX
Schreiber, S
Van Kooten, R
Pansart, JP
Whalley, MA
Mes, H
Pilcher, JE
Beck, A
Routenburg, P
Dieckmann, A
Tsukamoto, T
Humbert, R
Hinshaw, DA
Burckhart, HJ
Sproston, M
Clarke, PEL
Michelini, A
Keywords: OPAL detector;Final state photons;Photon sample
Issue Date: 1991
Publisher: Elsevier
Citation: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 1991, 264 (1-2), pp. 219 - 232
Abstract: The production rate of final state photons in hadronic Z0 decays is measured as a function of ycut = Mij2/Ecm2 the jet resolution parameter and minimum mass of the photon-jet system. Good agreement with the theoretical expectation from an O(ααs) matrix element calculation is observed. Comparing the measurement and the prediction for ycut = 0.06, where the experimental systematic and statistical errors and the theoretical uncertainties are small, and combining this measurement with our result for the hadronic width of the Z0, we derived partial widths of up and down type quarks to be Γu = 333 ± 55 ± 72 MeV and Γd = 358 ± 37 ± 48 MeV in agreement with the standard model expectations. We compare our yield with the QCD shower models including photon radiation. At low γcut JETSET underestimates the photon yield, and ARIADNE describes the production rate well.
URI: http://bura.brunel.ac.uk/handle/2438/9604
DOI: http://dx.doi.org/10.1016/0370-2693(91)90731-5
ISSN: 0370-2693
Appears in Collections:Dept of Electronic and Computer Engineering Research Papers

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