Precise determination of the Z resonance parameters at LEP: "Zedometry"

Authors
Abbiendi, G Ainsley, C Akesson, PF Alexander, G Allison, J Anagnostou, G Anderson, KJ Arcelli, S Asai, S Ashby, SF Axen, D Azuelos, G Bailey, I Ball, AH Barberio, E Barlow, RJ Behnke, T Bell, KW Bella, G Bellerive, A Benelli, G Bentvelsen, S Beeston, C Bethke, S Biebel, O Bloodworth, IJ Boeriu, O Bock, P Bohme, J Bonacorsi, D Boutemeur, M Braibant, S Bright-Thomas, P Brigliadori, L Brown, RM Burckhart, HJ Cammin, J Capiluppi, P Carnegie, RK Caron, B Carter, AA Carter, JR Chang, CY Charlton, DG Clarke, PEL Clay, E Cohen, I Conboy, JE Cooke, OC Couchman, J Coxe, RL Csilling, A Cuffiani, M Dado, S Dallavalle, GM Dallison, S Darling, C De Roeck, A De Wolf, EA Dervan, P Desch, K Dienes, B Dixit, MS Donkers, M Dubbert, J Duchovni, E Duckeck, G Duerdoth, IP Estabrooks, PG Etzion, F Fabbri, F Fanti, M Feld, L Ferrari, P Fiedler, F Fleck, I Ford, M Foucher, M Frey, A Furtjes, A Futyan, DI Gagnon, P Gascon, J Gascon-Shotkin, SM Gary, JW Gaycken, G Geich-Gimbel, C Giacomelli, G Giacomelli, P Giacomelli, R Glenzinski, D Goldberg, J Grandi, C Graham, K Gross, E Grunhaus, J Gruwe, M Gunther, PO Hajdu, C Hanson, GG Harder, K Harel, A Harin-Dirac, M Hart, PA Hauschild, M Hawkes, CM Hawkings, R Hemingway, RJ Hensel, C Herten, G Heuer, RD Hildreth, MD Hill, JC Hillier, SJ Hocker, A Hoffman, K Homer, RJ Honma, AK Horvath, D Hossain, KR Howard, R Huntemeyer, P Igo-Kemenes, P Ishii, K Jacob, FR Jawahery, A Jeremie, H Jones, CR Jovanovic, P Junk, TR Kanaya, N Kanzaki, J Karapetian, G Karlen, D Kartvelishvili, V Kawagoe, K Kawamoto, T Keeler, RK Kellogg, RG Kennedy, BW Kim, DH Kirk, J Klein, K Klier, A Kluth, S Kobayashi, T Kobel, M Kokott, TP Komamiya, S Kowalewski, RV Kress, T Krieger, P von Krogh, J Krop, D Kuhl, T Kupper, M Kyberd, P Lafferty, GD Lahmann, R Lai, WP Landsman, H Lanske, D Lauber, J Lawson, I Layter, JG Lec, AM Leins, A Lellouch, D Letts, J Levinson, L Liebisch, R Lillich, J Littlewood, C Lloyd, AW Lloyd, SL Loebinger, FK Long, GD Losty, MJ Lu, J Ludwig, J Macchiolo, A Macpherson, A Mader, W Mannelli, M Marcellini, S Marchant, TE Martin, AJ Martin, JP Martinez, G Mashimo, T Mattig, P McDonald, WJ McKenna, J McMahon, TJ McPherson, RA Meijers, F Mendez-Lorenzo, P Menges, W Menke, S Merritt, FS Mes, H Michelini, A Mihara, S Mikenberg, G Miller, DJ Mohr, W Montanari, A Mori, T Muller, U Nagai, K Nakamura, I Neal, HA Nisius, R O'Neale, SW Oakham, FG Odorici, F Oh, A Okpara, A Oldershaw, NJ Oreglia, MJ Orito, S Palmonari, F Pasztor, G Pater, JR Patrick, GN Pfeifenschneider, P Pilcher, JE Pinfold, J Plane, DE Poli, B Polok, J Pooth, O Przybycien, M Quadt, A Quast, G Rabbertz, K Raith, B Rembser, C Renkel, P Rick, H Rodning, N Roney, JM Rosati, S Roscoe, K Rossi, AM Rozen, Y Runge, K Runolfsson, O Rust, DR Sachs, K Saeki, T Sahr, O Sarkisyan, EKG Sbarra, C Schaile, AD Schaile, O Scharff-Hansen, P Schmitt, B Schroder, M Schumacher, M Schwick, C Scott, WG Seuster, R Shears, TG Shen, BC Shepherd-Themistocleous, CH Sherwood, P Siroli, GP Skuja, A Smith, AM Smith, TJ Snow, GA Sobie, R Soldner-Rembold, S Spagnolo, S Springer, RW Sproston, M Stahl, A Stephens, K Stoll, K Strom, D Strohmer, R Stumpf, L Surrow, B Talbot, SD Tarem, S Taylor, RJ Teuscher, R Tecchio, M Thomas, J Thomson, MA Towers, S Toya, D Trefzger, T Trigger, I Troscanyi, Z Tsukamoto, T Tsur, E Turner-Watson, MF Ueda, I Vachon, B Vannerem, P Verzocchi, M Vokurka, EH Voss, H Vossebeld, J Wagner, A Wagner, DL Waller, D Ward, CP Ward, DR Watkins, PM Watson, AT Watson, NK Wells, PS Wengler, T Wermes, N Wetterling, D White, JS Wilson, GW Wilson, JA Wyatt, TR Yamashita, S Zacek, V Zer-Zion, D
Citation
G. Abbiendi et al., Precise determination of the Z resonance parameters at LEP: "Zedometry", EUR PHY J C, 19(4), 2001, pp. 587-651
Citations number
119
Language
INGLESE
art.tipo
Review
Categorie Soggetti
Physics
Journal title
EUROPEAN PHYSICAL JOURNAL C
ISSN journal
1434-6044 → ACNP
Volume
19
Issue
4
Year of publication
2001
Pages
587 - 651
Database
ISI
SICI code
1434-6044(200103)19:4<587:PDOTZR>2.0.ZU;2-G
Abstract
This final analysis of hadronic and leptonic cross-sections and of leptonic forward-backward asymmetries in e(+)e(-) collisions With the OPAL detector makes use of tile full LEP 1 data sample comprising 161pb(-1) of integrate d luminosity and 4.5 x 10(6) selected Z decays. An interpretation of the da ta in terms of contributions from pure Z exchange and from gamma /Z interfe rence allows the parameters of tile Z resonance to be determined in a model -independent way. Our results are in good agreement with lepton universalit y anti consistent with the vector and axial-vector couplings predicted in t he Standard Model. A fit to the complete dataset yields the fundamental Z r esonance parameters: m(z) = (91.1852 +/- 0.0030) GeV. Gamma (Z) = 12.4948 /- 0.0041) GeV. sigma (0)(h) = (41.501 +/- 0.055) nb. R-l = 20.823 +/- 0.04 4, and A(FB)(0,l) = 0.0145 +/- 0.0017. Transforming these parameters gives a measurement of the ratio between the decay width into invisible particles and the width to a single species of charged lepton. Gamma (inv)/Gamma (ll ) = 5.942 +/- 0.027. Attributing the entire invisible width to neutrino, de cays and assuming tile Standard Model couplings for neutrinos. this transla tes into a measurement of the effective number of light neutrino species. N -nu = 2.984 +/- 0.013. Interpreting the data within the context of the Stan dard Model allows the mass of the top quark, m(t) = (162(-16)(+29)) GeV, to be determined through its influence oil radiative corrections. Alternative ly, utilising the direct external measurement of m(t) as an additional cons traint leads to a measurement of the strong coupling constant and the mass of the Higgs boson: alpha (s)(m(Z)) = 0.127 +/- 0.005 and m(H) = (390(-280) (+750)) GeV.