Abstract
Using approximately 4.3 million hadronic Z0 decays collected with the OPAL detector at LEP between 1990 and 1995, we measure the branching fractions of the Z0 into up-type and down-type light quarks, Rq, and the forward-backward asymmetries, AFB(q), using high-momentum stable particles as a tag. Adopting a method that employs double tagged events to determine the flavour tagging efficiencies, and assuming the flavour independence of strong interactions and SU(2) isospin symmetry, we measure: Rd,s/(Rd + Ru + Rs) = 0.371 ±0.016 (stat.) ±0.016 (syst.) and AFB(d, s) = 0.068 ±0.035 (stat.) ±0.011 (syst.) , assuming the branching fractions and forward-backward asymmetries of down and strange quarks to be equal. The results are essentially free of assumptions based on hadronisation models. These results are in agreement with the Standard Model expectations and are used to infer the left and right handed couplings of strange/down quarks to the Z0, yielding gLd,s = -0.44-0.09+0.13 and gRd,s = +0.13-0.17+0.15. The results for the up quark, Ru/(Rd + Ru + Rs) = 0.258 ± 0.031 (stat.) ± 0.032 (syst.) and AFB(u) = 0.040 ±0.067 (stat.) ±0.028 (syst.), are fully negatively correlated and almost completely positively correlated, respectively, with the corresponding down-type results.
| Original language | English |
|---|---|
| Pages (from-to) | 387-400 |
| Number of pages | 14 |
| Journal | Zeitschrift fur Physik C-Particles and Fields |
| Volume | 76 |
| Issue number | 3 |
| DOIs | |
| State | Published - Nov 1997 |
Funding
| Funders | Funder number |
|---|---|
| Direction des Sciences de la Matière du Commissariat à l’Energie Atomique | |
| German Israeli Bi-national Science Foundation | |
| Hungarian Foundation for Scientific Research | OTKA T-016660, OTKA F-023259, T023793 |
| Minerva Gesellschaft | |
| National Science Foundation | |
| U.S. Department of Energy | |
| Natural Sciences and Engineering Research Council of Canada | |
| National Research Council Canada | |
| Ministry of Education, Culture, Sports, Science and Technology | |
| Bundesministerium für Bildung und Forschung | |
| Israel Academy of Sciences and Humanities | |
| Israel Science Foundation |
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In: Zeitschrift fur Physik C-Particles and Fields, Vol. 76, No. 3, 11.1997, p. 387-400.
Research output: Contribution to journal › Article › peer-review
TY - JOUR
T1 - Measurement of the branching fractions and forward-backward asymmetries of the Z0 into light quarks
AU - Ackerstaff, K.
AU - Alexander, G.
AU - Allison, J.
AU - Altekamp, N.
AU - Anderson, K. J.
AU - Anderson, S.
AU - Arcelli, S.
AU - Asai, S.
AU - Axen, D.
AU - Azuelos, G.
AU - Ball, A. H.
AU - Barberio, E.
AU - Barlow, R. J.
AU - Bartoldus, R.
AU - Batley, J. R.
AU - Baumann, S.
AU - Bechtluft, J.
AU - Beeston, C.
AU - Behnke, T.
AU - Bell, A. N.
AU - Bell, K. W.
AU - Bella, G.
AU - Bentvelsen, S.
AU - Berlich, P.
AU - Bethke, S.
AU - Biebel, O.
AU - Biguzzi, A.
AU - Bird, S. D.
AU - Blobel, V.
AU - Bloodworth, I. J.
AU - Bloomer, J. E.
AU - Bobinski, M.
AU - Bock, P.
AU - Bonacorsi, D.
AU - Boutemeur, M.
AU - Bouwens, B. T.
AU - Braibant, S.
AU - Brigliadori, L.
AU - Brown, R. M.
AU - Burckhart, H. J.
AU - Burgard, C.
AU - Bürgin, R.
AU - Capiluppi, P.
AU - Carnegie, R. K.
AU - Carter, A. A.
AU - Carter, J. R.
AU - Chang, C. Y.
AU - Charlton, D. G.
AU - Chrisman, D.
AU - Clarke, P. E.L.
AU - Cohen, I.
AU - Conboy, J. E.
AU - Cooke, O. C.
AU - Cuffiani, M.
AU - Dado, S.
AU - Dallapiccola, C.
AU - Dallavalle, G. M.
AU - De Jong, S.
AU - Del Pozo, L. A.
AU - Desch, K.
AU - Dixit, M. S.
AU - Do Couto E Silva, E.
AU - Doucet, M.
AU - Duchovni, E.
AU - Duckeck, G.
AU - Duerdoth, I. P.
AU - Eatough, D.
AU - Edwards, J. E.G.
AU - Estabrooks, P. G.
AU - Evans, H. G.
AU - Evans, M.
AU - Fabbri, F.
AU - Fanti, M.
AU - Faust, A. A.
AU - Fiedler, F.
AU - Fierro, M.
AU - Fischer, H. M.
AU - Fleck, I.
AU - Folman, R.
AU - Fong, D. G.
AU - Foucher, M.
AU - Fürtjes, A.
AU - Futyan, D. I.
AU - Gagnon, P.
AU - Gary, J. W.
AU - Gascon, J.
AU - Gascon-Shotkin, S. M.
AU - Geddes, N. I.
AU - Geich-Gimbel, C.
AU - Geralis, T.
AU - Giacomelli, G.
AU - Giacomelli, P.
AU - Giacomelli, R.
AU - Gibson, V.
AU - Gibson, W. R.
AU - Gingrich, D. M.
AU - Glenzinski, D.
AU - Goldberg, J.
AU - Goodrick, M. J.
AU - Gorn, W.
AU - Grandi, C.
AU - Gross, E.
AU - Grunhaus, J.
AU - Gruwé, M.
AU - Hajdu, C.
AU - Hanson, G. G.
AU - Hansroul, M.
AU - Hapke, M.
AU - Hargrove, C. K.
AU - Hart, P. A.
AU - Hartmann, C.
AU - Hauschild, M.
AU - Hawkes, C. M.
AU - Hawkings, R.
AU - Hemingway, R. J.
AU - Herndon, M.
AU - Herten, G.
AU - Heuer, R. D.
AU - Hildreth, M. D.
AU - Hill, J. C.
AU - Hillier, S. J.
AU - Hilse, T.
AU - Hobson, P. R.
AU - Homer, R. J.
AU - Honma, A. K.
AU - Horváth, D.
AU - Howard, R.
AU - Hutchcroft, D. E.
AU - Igo-Kemenes, P.
AU - Imrie, D. C.
AU - Ingram, M. R.
AU - Ishii, K.
AU - Jawahery, A.
AU - Jeffreys, P. W.
AU - Jeremie, H.
AU - Jimack, M.
AU - Joly, A.
AU - Jones, C. R.
AU - Jones, G.
AU - Jones, M.
AU - Jost, U.
AU - Jovanovic, P.
AU - Junk, T. R.
AU - Karlen, D.
AU - Kartvelishvili, V.
AU - Kawagoe, K.
AU - Kawamoto, T.
AU - Keeler, R. K.
AU - Kellogg, R. G.
AU - Kennedy, B. W.
AU - Kirk, J.
AU - Klier, A.
AU - Kluth, S.
AU - Kobayashi, T.
AU - Kobel, M.
AU - Koetke, D. S.
AU - Kokott, T. P.
AU - Kolrep, M.
AU - Komamiya, S.
AU - Kress, T.
AU - Krieger, P.
AU - Von Krogh, J.
AU - Kyberd, P.
AU - Lafferty, G. D.
AU - Lahmann, R.
AU - Lai, W. P.
AU - Lanske, D.
AU - Lauber, J.
AU - Lautenschlager, S. R.
AU - Layter, J. G.
AU - Lazic, D.
AU - Lee, A. M.
AU - Lefebvre, E.
AU - Lellouch, D.
AU - Letts, J.
AU - Levinson, L.
AU - Lloyd, S. L.
AU - Loebinger, F. K.
AU - Long, G. D.
AU - Losty, M. J.
AU - Ludwig, J.
AU - Macchiolo, A.
AU - Macpherson, A.
AU - Mannelli, M.
AU - Marcellini, S.
AU - Markus, C.
AU - Martin, A. J.
AU - Martin, J. P.
AU - Martinez, G.
AU - Mashimo, T.
AU - Mättig, P.
AU - McDonald, W. J.
AU - McKenna, J.
AU - Mckigney, E. A.
AU - McMahon, T. J.
AU - McPherson, R. A.
AU - Meijers, F.
AU - Menke, S.
AU - Merritt, F. S.
AU - Mes, H.
AU - Meyer, J.
AU - Michelini, A.
AU - Mikenberg, G.
AU - Miller, D. J.
AU - Mincer, A.
AU - Mir, R.
AU - Mohr, W.
AU - Montanari, A.
AU - Mori, T.
AU - Morii, M.
AU - Müller, U.
AU - Nagai, K.
AU - Nakamura, I.
AU - Neal, H. A.
AU - Nellen, B.
AU - Nisius, R.
AU - O'Neale, S. W.
AU - Oakham, F. G.
AU - Odorici, F.
AU - Ogren, H. O.
AU - Oldershaw, N. J.
AU - Oreglia, M. J.
AU - Orito, S.
AU - Pálinkas, J.
AU - Pásztor, G.
AU - Pater, J. R.
AU - Patrick, G. N.
AU - Patt, J.
AU - Pearce, M. J.
AU - Petzold, S.
AU - Pfeifenschneider, P.
AU - Pilcher, J. E.
AU - Pinfold, J.
AU - Plane, D. E.
AU - Poffenberger, P.
AU - Poli, B.
AU - Posthaus, A.
AU - Przysiezniak, H.
AU - Rees, D. L.
AU - Rigby, D.
AU - Robertson, S.
AU - Robins, S. A.
AU - Rodning, N.
AU - Roney, J. M.
AU - Rooke, A.
AU - Ros, E.
AU - Rossi, A. M.
AU - Rosvick, M.
AU - Routenburg, P.
AU - Rozen, Y.
AU - Runge, K.
AU - Runolfsson, O.
AU - Ruppel, U.
AU - Rust, D. R.
AU - Rylko, R.
AU - Sachs, K.
AU - Saeki, T.
AU - Sarkisyan, E. K.G.
AU - Sbarra, C.
AU - Schaile, A. D.
AU - Schaile, O.
AU - Scharf, F.
AU - Scharff-Hansen, P.
AU - Schenk, P.
AU - Schieck, J.
AU - Schleper, P.
AU - Schmitt, B.
AU - Schmitt, S.
AU - Schöning, A.
AU - Schröder, M.
AU - Schultz-Coulon, H. C.
AU - Schulz, M.
AU - Schumacher, M.
AU - Schwick, C.
AU - Scott, W. G.
AU - Shears, T. G.
AU - Shen, B. C.
AU - Shepherd-Themistocleous, C. H.
AU - Sherwood, P.
AU - Siroli, G. P.
AU - Sittler, A.
AU - Skillman, A.
AU - Skuja, A.
AU - Smith, A. M.
AU - Snow, G. A.
AU - Sobie, R.
AU - Söldner-Rembold, S.
AU - Springer, R. W.
AU - Sproston, M.
AU - Stephens, K.
AU - Steuerer, J.
AU - Stockhausen, B.
AU - Stoll, K.
AU - Strom, D.
AU - Szymanski, P.
AU - Tafirout, R.
AU - Talbot, S. D.
AU - Tanaka, S.
AU - Taras, P.
AU - Tarem, S.
AU - Teuscher, R.
AU - Thiergen, M.
AU - Thomson, M. A.
AU - Von Törne, E.
AU - Towers, S.
AU - Trigger, I.
AU - Tsur, E.
AU - Turcot, A. S.
AU - Turner-Watson, M. F.
AU - Utzat, P.
AU - Van Kooten, R.
AU - Verzocchi, M.
AU - Vikas, P.
AU - Vokurka, E. H.
AU - Voss, H.
AU - Wäckerle, F.
AU - Wagner, A.
AU - Ward, C. P.
AU - Ward, D. R.
AU - Watkins, P. M.
AU - Watson, A. T.
AU - Watson, N. K.
AU - Wells, P. S.
AU - Wermes, N.
AU - White, J. S.
AU - Wilkens, B.
AU - Wilson, G. W.
AU - Wilson, J. A.
AU - Wolf, G.
AU - Wyatt, T. R.
AU - Yamashita, S.
AU - Yekutieli, G.
AU - Zacek, V.
AU - Zer-Zion, D.
N1 - Funding Information: Acknowledgements. We particularly wish to thank the SL Division for the efficient operation of the LEP accelerator and for their continuing close co-operation with our experimental group. We thank our colleagues from CEA, DAPNIA/SPP, CE-Saclay for their efforts over the years on the time-of-flight and trigger systems which we continue to use. In addition to the support staff at our own institutions we are pleased to acknowledge the Department of Energy, USA, National Science Foundation, USA, Particle Physics and Astronomy Research Council, UK, Natural Sciences and Engineering Research Council, Canada, Israel Science Foundation, administered by the Israel Academy of Science and Humanities, Minerva Gesellschaft, Benoziyo Center for High Energy Physics, Japanese Ministry of Education, Science and Culture (the Monbusho) and a grant under the Mon-busho International Science Research Program, German Israeli Bi-national Science Foundation (GIF), Direction des Sciences de la Matière du Commissariat à l’Energie Atomique, France, Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie, Germany, National Research Council of Canada, Hungarian Foundation for Scientific Research, OTKA T-016660, T023793 and OTKA F-023259.
PY - 1997/11
Y1 - 1997/11
N2 - Using approximately 4.3 million hadronic Z0 decays collected with the OPAL detector at LEP between 1990 and 1995, we measure the branching fractions of the Z0 into up-type and down-type light quarks, Rq, and the forward-backward asymmetries, AFB(q), using high-momentum stable particles as a tag. Adopting a method that employs double tagged events to determine the flavour tagging efficiencies, and assuming the flavour independence of strong interactions and SU(2) isospin symmetry, we measure: Rd,s/(Rd + Ru + Rs) = 0.371 ±0.016 (stat.) ±0.016 (syst.) and AFB(d, s) = 0.068 ±0.035 (stat.) ±0.011 (syst.) , assuming the branching fractions and forward-backward asymmetries of down and strange quarks to be equal. The results are essentially free of assumptions based on hadronisation models. These results are in agreement with the Standard Model expectations and are used to infer the left and right handed couplings of strange/down quarks to the Z0, yielding gLd,s = -0.44-0.09+0.13 and gRd,s = +0.13-0.17+0.15. The results for the up quark, Ru/(Rd + Ru + Rs) = 0.258 ± 0.031 (stat.) ± 0.032 (syst.) and AFB(u) = 0.040 ±0.067 (stat.) ±0.028 (syst.), are fully negatively correlated and almost completely positively correlated, respectively, with the corresponding down-type results.
AB - Using approximately 4.3 million hadronic Z0 decays collected with the OPAL detector at LEP between 1990 and 1995, we measure the branching fractions of the Z0 into up-type and down-type light quarks, Rq, and the forward-backward asymmetries, AFB(q), using high-momentum stable particles as a tag. Adopting a method that employs double tagged events to determine the flavour tagging efficiencies, and assuming the flavour independence of strong interactions and SU(2) isospin symmetry, we measure: Rd,s/(Rd + Ru + Rs) = 0.371 ±0.016 (stat.) ±0.016 (syst.) and AFB(d, s) = 0.068 ±0.035 (stat.) ±0.011 (syst.) , assuming the branching fractions and forward-backward asymmetries of down and strange quarks to be equal. The results are essentially free of assumptions based on hadronisation models. These results are in agreement with the Standard Model expectations and are used to infer the left and right handed couplings of strange/down quarks to the Z0, yielding gLd,s = -0.44-0.09+0.13 and gRd,s = +0.13-0.17+0.15. The results for the up quark, Ru/(Rd + Ru + Rs) = 0.258 ± 0.031 (stat.) ± 0.032 (syst.) and AFB(u) = 0.040 ±0.067 (stat.) ±0.028 (syst.), are fully negatively correlated and almost completely positively correlated, respectively, with the corresponding down-type results.
UR - http://www.scopus.com/inward/record.url?scp=33750109335&partnerID=8YFLogxK
U2 - 10.1007/s002880050563
DO - 10.1007/s002880050563
M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???
AN - SCOPUS:33750109335
SN - 0170-9739
VL - 76
SP - 387
EP - 400
JO - Zeitschrift fur Physik C-Particles and Fields
JF - Zeitschrift fur Physik C-Particles and Fields
IS - 3
ER -