Precision luminosity for Z0 lineshape measurements with a silicon-tungsten calorimeter: The opal collaboration

G. Abbiendi, K. Ackerstaff, G. Alexander, J. Allison, K. J. Anderson, S. Anderson, S. Arcelli, S. Asai, S. F. Ashby, D. Axen, G. Azuelos, A. H. Ball, E. Barberio, R. J. Barlow, J. R. Batley, S. Baumann, J. Bechtlu, T. Behnke, K. W. Bell, G. BellaA. Bellerive, S. Bentvelsen, S. Bethke, S. Betts, O. Biebel, A. Biguzzi, I. J. Bloodworth, P. Bock, J. Böhme, O. Boeriu, D. Bonacorsi, M. Boutemeur, S. Braibant, P. Bright-Thomas, L. Brigliadori, R. M. Brown, H. J. Burckhart, P. Capiluppi, R. K. Carnegie, A. A. Carter, J. R. Carter, C. Y. Chang, D. G. Charlton, D. Chrisman, C. Ciocca, P. E.L. Clarke, E. Clay, I. Cohen, J. E. Conboy, O. C. Cooke, J. Couchman, C. Couyoumtzelis, R. L. Coxe, M. Cuffiani, S. Dado, G. M. Dallavalle, S. Dallison, C. Darling, R. Davis, S. De Jong, A. de Roeck, P. Dervan, K. Desch, B. Dienes, M. S. Dixit, M. Donkers, J. Dubbert, E. Duchovni, G. Duckeck, I. P. Duerdoth, P. G. Estabrooks, E. Etzion, H. Evans, F. Fabbri, A. Fanfani, M. Fanti, A. A. Faust, L. Feld, P. Ferrari, F. Fiedler, M. Fierro, I. Fleck, M. Foucher, A. Frey, A. Fürtjes, D. I. Futyan, P. Gagnon, J. W. Gary, S. Gascon-Shotkin, G. Gaycken, C. Geich-Gimbel, G. Giacomelli, P. Giacomelli, R. Giacomelli, W. R. Gibson, D. M. Gingrich, D. Glenzinski, J. Goldberg, W. Gorn, C. Grandi, K. Graham, E. Gross, J. Grunhaus, M. Gruwé, C. Hajdu, G. G. Hanson, M. Hansroul, M. Hapke, K. Harder, A. Harel, C. K. Hargrove, M. Harin-Dirac, P. Hart, M. Hauschild, C. M. Hawkes, R. Hawkings, R. J. Hemingway, G. Herten, R. D. Heuer, M. D. Hildreth, J. C. Hill, S. Hillier, P. R. Hobson, A. Hocker, K. Hoffman, R. J. Homer, A. K. Honma, D. Horváth, K. R. Hossain, R. Howard, P. Hüntemeyer, P. Igo-Kemenes, D. C. Imrie, K. Ishii, F. R. Jacob, A. Jawahery, H. Jeremie, M. Jimack, C. R. Jones, P. Jovanovic, T. R. Junk, N. Kanaya, J. Kanzaki, D. Karlen, V. Kartvelishvili, K. Kawagoe, T. Kawamoto, P. I. Kayal, R. K. Keeler, R. G. Kellogg, B. W. Kennedy, D. H. Kim, J. Kirk, A. Klier, T. Kobayashi, M. Kobel, T. P. Kokott, M. Kolrep, Sachio Komamiya, R. V. Kowalewski, T. Kress, P. Krieger, J. von Krogh, T. Kuhl, P. Kyberd, W. P. Lai, G. D. Lafferty, R. Lahmann, H. Landsman, D. Lanske, J. Lauber, I. Lawson, J. G. Layter, A. M. Lee, D. Lellouch, J. Letts, L. Levinson, R. Liebisch, J. Lillich, B. List, C. Littlewood, A. W. Lloyd, S. L. Lloyd, F. K. Loebinger, G. D. Long, M. J. Losty, J. Lu, J. Ludwig, D. Liu, A. Macchiolo, A. Macpherson, W. Mader, M. Mannelli, S. Marcellini, T. E. Marchant, A. J. Martin, J. P. Martin, G. Martinez, T. Mashimo, P. Mättig, W. J. McDonald, J. McKenna, E. A. Mckigney, T. J. McMahon, R. A. McPherson, F. Meijers, P. Mendez-Lorenzo, S. Menke, F. S. Merritt, H. Mes, I. Meyer, A. Michelini, S. Mihara, G. Mikenberg, D. J. Miller, W. Mohr, A. Montanari, T. Mori, U. Müller, K. Nagai, I. Nakamura, H. A. Neal, R. Nisius, S. W. O'Neale, F. G. Oakham, F. Odorici, H. O. Ogren, A. Okpara, M. J. Oreglia, S. Orito, F. Palmonari, G. Pásztor, J. R. Pater, G. N. Patrick, J. Patt, R. Perez-Ochoa, S. Petzold, P. Pfeifenschneider, J. E. Pilcher, J. Pinfold, D. E. Plane, P. Poffenberger, B. Poli, J. Polok, M. Przybycień, A. Quadt, B. Raith, C. Rembser, H. Rick, S. Robertson, S. A. Robins, N. Rodning, J. M. Roney, S. Rosati, K. Roscoe, A. M. Rossi, Y. Rozen, K. Runge, O. Runolfsson, D. R. Rust, K. Sachs, T. Saeki, O. Sahr, W. M. Sang, E. K.G. Sarkisyan, C. Sbarra, A. D. Schaile, O. Schaile, P. Scharff-Hansen, J. Schieck, B. Schmitt, S. Schmitt, A. Schöning, M. Schröder, M. Schumacher, C. Schwick, W. G. Scott, R. Seuster, T. G. Shears, B. C. Shen, C. H. Shepherd-Themistocleous, P. Sherwood, G. P. Siroli, A. Skuja, A. M. Smith, G. A. Snow, R. Sobie, S. Söldner-Rembold, S. Spagnolo, W. Springer, M. Sproston, A. Stahl, K. Stephens, K. Stoll, D. Strom, R. Ströhmer, B. Surrow, S. D. Talbot, P. Taras, S. Tarem, M. Tecchio, R. Teuscher, M. Thiergen, J. Thomas, M. A. Thomson, E. Torrence, S. Towers, T. Trefzger, I. Trigger, Z. Trócsányi, E. Tsur, M. F. Turner-Watson, I. Ueda, R. Van Kooten, P. Vannerem, M. Verzocchi, H. Voss, F. Wäckerle, A. Wagner, D. Wagner, D. Waller, C. P. Ward, D. R. Ward, P. M. Watkins, A. T. Watson, N. K. Watson, P. S. Wells, N. Wermes, D. Wetterling, J. S. White, G. W. Wilson, J. A. Wilson, T. R. Wyatt, S. Yamashita, V. Zacek, D. Zer-Zion

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

The measurement of small-angle Bhabha scattering is used to determine the luminosity at the OPAL interaction point for the LEP I data recorded between 1993 and 1995. The measurement is based on the OPAL Silicon-Tungsten Luminometer which is composed of two calorimeters encircling the LEP beam pipe, on opposite sides of the interaction point. The luminometer detects electrons from small-angle Bhabha scattering at angles between 25 and 58 mrad. At LEP center-of-mass energies around the Z0, about half of all Bhabha electrons entering the detector fall within a 79 nb fiducial acceptance region. The electromagnetic showers generated in the stack of 1 radiation length tungsten absorber plates are sampled by 608 silicon detectors with 38,912 radial pads of 2.5 mm width. The fine segmentation of the detector, combined with the precise knowledge of its physical dimensions, allows the trajectories of incoming 45 GeV electrons or photons to be determined with a total systematic error of less than 7 microns. We have quantified all significant sources of systematic experimental error in the luminosity determination by direct physical measurement. All measured properites of the luminosity event sample are found to be in agreement with current theoretical expectations. The total systematic measurement uncertainty is 3.4 × 10-4, significantly below the theoretical error of 5.4 × 10-4 currently assigned to the QED calculation of the Bhabha acceptance, and contributes negligibly to the total uncertainty in the OPAL measurement of Γinvℓ+ℓ-, a quantity of basic physical interest which depends crucially on the luminosity measurement.

Original languageEnglish
Pages (from-to)373-425
Number of pages53
JournalEuropean Physical Journal C
Volume14
Issue number3
Publication statusPublished - 2000 Jan 1
Externally publishedYes

Fingerprint

Calorimeters
calorimeters
Tungsten
Luminance
tungsten
luminosity
Silicon
silicon
Electrons
acceptability
detectors
Scattering
Detectors
Silicon detectors
Systematic errors
electrons
showers
scattering
systematic errors
Photons

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Physics and Astronomy (miscellaneous)

Cite this

Abbiendi, G., Ackerstaff, K., Alexander, G., Allison, J., Anderson, K. J., Anderson, S., ... Zer-Zion, D. (2000). Precision luminosity for Z0 lineshape measurements with a silicon-tungsten calorimeter: The opal collaboration. European Physical Journal C, 14(3), 373-425.

Precision luminosity for Z0 lineshape measurements with a silicon-tungsten calorimeter : The opal collaboration. / Abbiendi, G.; Ackerstaff, K.; Alexander, G.; Allison, J.; Anderson, K. J.; Anderson, S.; Arcelli, S.; Asai, S.; Ashby, S. F.; Axen, D.; Azuelos, G.; Ball, A. H.; Barberio, E.; Barlow, R. J.; Batley, J. R.; Baumann, S.; Bechtlu, J.; Behnke, T.; Bell, K. W.; Bella, G.; Bellerive, A.; Bentvelsen, S.; Bethke, S.; Betts, S.; Biebel, O.; Biguzzi, A.; Bloodworth, I. J.; Bock, P.; Böhme, J.; Boeriu, O.; Bonacorsi, D.; Boutemeur, M.; Braibant, S.; Bright-Thomas, P.; Brigliadori, L.; Brown, R. M.; Burckhart, H. J.; Capiluppi, P.; Carnegie, R. K.; Carter, A. A.; Carter, J. R.; Chang, C. Y.; Charlton, D. G.; Chrisman, D.; Ciocca, C.; Clarke, P. E.L.; Clay, E.; Cohen, I.; Conboy, J. E.; Cooke, O. C.; Couchman, J.; Couyoumtzelis, C.; Coxe, R. L.; Cuffiani, M.; Dado, S.; Dallavalle, G. M.; Dallison, S.; Darling, C.; Davis, R.; De Jong, S.; de Roeck, A.; Dervan, P.; Desch, K.; Dienes, B.; Dixit, M. S.; Donkers, M.; Dubbert, J.; Duchovni, E.; Duckeck, G.; Duerdoth, I. P.; Estabrooks, P. G.; Etzion, E.; Evans, H.; Fabbri, F.; Fanfani, A.; Fanti, M.; Faust, A. A.; Feld, L.; Ferrari, P.; Fiedler, F.; Fierro, M.; Fleck, I.; Foucher, M.; Frey, A.; Fürtjes, A.; Futyan, D. I.; Gagnon, P.; Gary, J. W.; Gascon-Shotkin, S.; Gaycken, G.; Geich-Gimbel, C.; Giacomelli, G.; Giacomelli, P.; Giacomelli, R.; Gibson, W. R.; Gingrich, D. M.; Glenzinski, D.; Goldberg, J.; Gorn, W.; Grandi, C.; Graham, K.; Gross, E.; Grunhaus, J.; Gruwé, M.; Hajdu, C.; Hanson, G. G.; Hansroul, M.; Hapke, M.; Harder, K.; Harel, A.; Hargrove, C. K.; Harin-Dirac, M.; Hart, P.; Hauschild, M.; Hawkes, C. M.; Hawkings, R.; Hemingway, R. J.; Herten, G.; Heuer, R. D.; Hildreth, M. D.; Hill, J. C.; Hillier, S.; Hobson, P. R.; Hocker, A.; Hoffman, K.; Homer, R. J.; Honma, A. K.; Horváth, D.; Hossain, K. R.; Howard, R.; Hüntemeyer, P.; Igo-Kemenes, P.; Imrie, D. C.; Ishii, K.; Jacob, F. R.; Jawahery, A.; Jeremie, H.; Jimack, M.; Jones, C. R.; Jovanovic, P.; Junk, T. R.; Kanaya, N.; Kanzaki, J.; Karlen, D.; Kartvelishvili, V.; Kawagoe, K.; Kawamoto, T.; Kayal, P. I.; Keeler, R. K.; Kellogg, R. G.; Kennedy, B. W.; Kim, D. H.; Kirk, J.; Klier, A.; Kobayashi, T.; Kobel, M.; Kokott, T. P.; Kolrep, M.; Komamiya, Sachio; Kowalewski, R. V.; Kress, T.; Krieger, P.; von Krogh, J.; Kuhl, T.; Kyberd, P.; Lai, W. P.; Lafferty, G. D.; Lahmann, R.; Landsman, H.; Lanske, D.; Lauber, J.; Lawson, I.; Layter, J. G.; Lee, A. M.; Lellouch, D.; Letts, J.; Levinson, L.; Liebisch, R.; Lillich, J.; List, B.; Littlewood, C.; Lloyd, A. W.; Lloyd, S. L.; Loebinger, F. K.; Long, G. D.; Losty, M. J.; Lu, J.; Ludwig, J.; Liu, D.; Macchiolo, A.; Macpherson, A.; Mader, W.; Mannelli, M.; Marcellini, S.; Marchant, T. E.; Martin, A. J.; Martin, J. P.; Martinez, G.; Mashimo, T.; Mättig, P.; McDonald, W. J.; McKenna, J.; Mckigney, E. A.; McMahon, T. J.; McPherson, R. A.; Meijers, F.; Mendez-Lorenzo, P.; Menke, S.; Merritt, F. S.; Mes, H.; Meyer, I.; Michelini, A.; Mihara, S.; Mikenberg, G.; Miller, D. J.; Mohr, W.; Montanari, A.; Mori, T.; Müller, U.; Nagai, K.; Nakamura, I.; Neal, H. A.; Nisius, R.; O'Neale, S. W.; Oakham, F. G.; Odorici, F.; Ogren, H. O.; Okpara, A.; Oreglia, M. J.; Orito, S.; Palmonari, F.; Pásztor, G.; Pater, J. R.; Patrick, G. N.; Patt, J.; Perez-Ochoa, R.; Petzold, S.; Pfeifenschneider, P.; Pilcher, J. E.; Pinfold, J.; Plane, D. E.; Poffenberger, P.; Poli, B.; Polok, J.; Przybycień, M.; Quadt, A.; Raith, B.; Rembser, C.; Rick, H.; Robertson, S.; Robins, S. A.; Rodning, N.; Roney, J. M.; Rosati, S.; Roscoe, K.; Rossi, A. M.; Rozen, Y.; Runge, K.; Runolfsson, O.; Rust, D. R.; Sachs, K.; Saeki, T.; Sahr, O.; Sang, W. M.; Sarkisyan, E. K.G.; Sbarra, C.; Schaile, A. D.; Schaile, O.; Scharff-Hansen, P.; Schieck, J.; Schmitt, B.; Schmitt, S.; Schöning, A.; Schröder, M.; Schumacher, M.; Schwick, C.; Scott, W. G.; Seuster, R.; Shears, T. G.; Shen, B. C.; Shepherd-Themistocleous, C. H.; Sherwood, P.; Siroli, G. P.; Skuja, A.; Smith, A. M.; Snow, G. A.; Sobie, R.; Söldner-Rembold, S.; Spagnolo, S.; Springer, W.; Sproston, M.; Stahl, A.; Stephens, K.; Stoll, K.; Strom, D.; Ströhmer, R.; Surrow, B.; Talbot, S. D.; Taras, P.; Tarem, S.; Tecchio, M.; Teuscher, R.; Thiergen, M.; Thomas, J.; Thomson, M. A.; Torrence, E.; Towers, S.; Trefzger, T.; Trigger, I.; Trócsányi, Z.; Tsur, E.; Turner-Watson, M. F.; Ueda, I.; Van Kooten, R.; Vannerem, P.; Verzocchi, M.; Voss, H.; Wäckerle, F.; Wagner, A.; Wagner, D.; Waller, D.; Ward, C. P.; Ward, D. R.; Watkins, P. M.; Watson, A. T.; Watson, N. K.; Wells, P. S.; Wermes, N.; Wetterling, D.; White, J. S.; Wilson, G. W.; Wilson, J. A.; Wyatt, T. R.; Yamashita, S.; Zacek, V.; Zer-Zion, D.

In: European Physical Journal C, Vol. 14, No. 3, 01.01.2000, p. 373-425.

Research output: Contribution to journalArticle

Abbiendi, G, Ackerstaff, K, Alexander, G, Allison, J, Anderson, KJ, Anderson, S, Arcelli, S, Asai, S, Ashby, SF, Axen, D, Azuelos, G, Ball, AH, Barberio, E, Barlow, RJ, Batley, JR, Baumann, S, Bechtlu, J, Behnke, T, Bell, KW, Bella, G, Bellerive, A, Bentvelsen, S, Bethke, S, Betts, S, Biebel, O, Biguzzi, A, Bloodworth, IJ, Bock, P, Böhme, J, Boeriu, O, Bonacorsi, D, Boutemeur, M, Braibant, S, Bright-Thomas, P, Brigliadori, L, Brown, RM, Burckhart, HJ, Capiluppi, P, Carnegie, RK, Carter, AA, Carter, JR, Chang, CY, Charlton, DG, Chrisman, D, Ciocca, C, Clarke, PEL, Clay, E, Cohen, I, Conboy, JE, Cooke, OC, Couchman, J, Couyoumtzelis, C, Coxe, RL, Cuffiani, M, Dado, S, Dallavalle, GM, Dallison, S, Darling, C, Davis, R, De Jong, S, de Roeck, A, Dervan, P, Desch, K, Dienes, B, Dixit, MS, Donkers, M, Dubbert, J, Duchovni, E, Duckeck, G, Duerdoth, IP, Estabrooks, PG, Etzion, E, Evans, H, Fabbri, F, Fanfani, A, Fanti, M, Faust, AA, Feld, L, Ferrari, P, Fiedler, F, Fierro, M, Fleck, I, Foucher, M, Frey, A, Fürtjes, A, Futyan, DI, Gagnon, P, Gary, JW, Gascon-Shotkin, S, Gaycken, G, Geich-Gimbel, C, Giacomelli, G, Giacomelli, P, Giacomelli, R, Gibson, WR, Gingrich, DM, Glenzinski, D, Goldberg, J, Gorn, W, Grandi, C, Graham, K, Gross, E, Grunhaus, J, Gruwé, M, Hajdu, C, Hanson, GG, Hansroul, M, Hapke, M, Harder, K, Harel, A, Hargrove, CK, Harin-Dirac, M, Hart, P, Hauschild, M, Hawkes, CM, Hawkings, R, Hemingway, RJ, Herten, G, Heuer, RD, Hildreth, MD, Hill, JC, Hillier, S, Hobson, PR, Hocker, A, Hoffman, K, Homer, RJ, Honma, AK, Horváth, D, Hossain, KR, Howard, R, Hüntemeyer, P, Igo-Kemenes, P, Imrie, DC, Ishii, K, Jacob, FR, Jawahery, A, Jeremie, H, Jimack, M, Jones, CR, Jovanovic, P, Junk, TR, Kanaya, N, Kanzaki, J, Karlen, D, Kartvelishvili, V, Kawagoe, K, Kawamoto, T, Kayal, PI, Keeler, RK, Kellogg, RG, Kennedy, BW, Kim, DH, Kirk, J, Klier, A, Kobayashi, T, Kobel, M, Kokott, TP, Kolrep, M, Komamiya, S, Kowalewski, RV, Kress, T, Krieger, P, von Krogh, J, Kuhl, T, Kyberd, P, Lai, WP, Lafferty, GD, Lahmann, R, Landsman, H, Lanske, D, Lauber, J, Lawson, I, Layter, JG, Lee, AM, Lellouch, D, Letts, J, Levinson, L, Liebisch, R, Lillich, J, List, B, Littlewood, C, Lloyd, AW, Lloyd, SL, Loebinger, FK, Long, GD, Losty, MJ, Lu, J, Ludwig, J, Liu, D, Macchiolo, A, Macpherson, A, Mader, W, Mannelli, M, Marcellini, S, Marchant, TE, Martin, AJ, Martin, JP, Martinez, G, Mashimo, T, Mättig, P, McDonald, WJ, McKenna, J, Mckigney, EA, McMahon, TJ, McPherson, RA, Meijers, F, Mendez-Lorenzo, P, Menke, S, Merritt, FS, Mes, H, Meyer, I, Michelini, A, Mihara, S, Mikenberg, G, Miller, DJ, Mohr, W, Montanari, A, Mori, T, Müller, U, Nagai, K, Nakamura, I, Neal, HA, Nisius, R, O'Neale, SW, Oakham, FG, Odorici, F, Ogren, HO, Okpara, A, Oreglia, MJ, Orito, S, Palmonari, F, Pásztor, G, Pater, JR, Patrick, GN, Patt, J, Perez-Ochoa, R, Petzold, S, Pfeifenschneider, P, Pilcher, JE, Pinfold, J, Plane, DE, Poffenberger, P, Poli, B, Polok, J, Przybycień, M, Quadt, A, Raith, B, Rembser, C, Rick, H, Robertson, S, Robins, SA, Rodning, N, Roney, JM, Rosati, S, Roscoe, K, Rossi, AM, Rozen, Y, Runge, K, Runolfsson, O, Rust, DR, Sachs, K, Saeki, T, Sahr, O, Sang, WM, Sarkisyan, EKG, Sbarra, C, Schaile, AD, Schaile, O, Scharff-Hansen, P, Schieck, J, Schmitt, B, Schmitt, S, Schöning, A, Schröder, M, Schumacher, M, Schwick, C, Scott, WG, Seuster, R, Shears, TG, Shen, BC, Shepherd-Themistocleous, CH, Sherwood, P, Siroli, GP, Skuja, A, Smith, AM, Snow, GA, Sobie, R, Söldner-Rembold, S, Spagnolo, S, Springer, W, Sproston, M, Stahl, A, Stephens, K, Stoll, K, Strom, D, Ströhmer, R, Surrow, B, Talbot, SD, Taras, P, Tarem, S, Tecchio, M, Teuscher, R, Thiergen, M, Thomas, J, Thomson, MA, Torrence, E, Towers, S, Trefzger, T, Trigger, I, Trócsányi, Z, Tsur, E, Turner-Watson, MF, Ueda, I, Van Kooten, R, Vannerem, P, Verzocchi, M, Voss, H, Wäckerle, F, Wagner, A, Wagner, D, Waller, D, Ward, CP, Ward, DR, Watkins, PM, Watson, AT, Watson, NK, Wells, PS, Wermes, N, Wetterling, D, White, JS, Wilson, GW, Wilson, JA, Wyatt, TR, Yamashita, S, Zacek, V & Zer-Zion, D 2000, 'Precision luminosity for Z0 lineshape measurements with a silicon-tungsten calorimeter: The opal collaboration', European Physical Journal C, vol. 14, no. 3, pp. 373-425.
Abbiendi G, Ackerstaff K, Alexander G, Allison J, Anderson KJ, Anderson S et al. Precision luminosity for Z0 lineshape measurements with a silicon-tungsten calorimeter: The opal collaboration. European Physical Journal C. 2000 Jan 1;14(3):373-425.
Abbiendi, G. ; Ackerstaff, K. ; Alexander, G. ; Allison, J. ; Anderson, K. J. ; Anderson, S. ; Arcelli, S. ; Asai, S. ; Ashby, S. F. ; Axen, D. ; Azuelos, G. ; Ball, A. H. ; Barberio, E. ; Barlow, R. J. ; Batley, J. R. ; Baumann, S. ; Bechtlu, J. ; Behnke, T. ; Bell, K. W. ; Bella, G. ; Bellerive, A. ; Bentvelsen, S. ; Bethke, S. ; Betts, S. ; Biebel, O. ; Biguzzi, A. ; Bloodworth, I. J. ; Bock, P. ; Böhme, J. ; Boeriu, O. ; Bonacorsi, D. ; Boutemeur, M. ; Braibant, S. ; Bright-Thomas, P. ; Brigliadori, L. ; Brown, R. M. ; Burckhart, H. J. ; Capiluppi, P. ; Carnegie, R. K. ; Carter, A. A. ; Carter, J. R. ; Chang, C. Y. ; Charlton, D. G. ; Chrisman, D. ; Ciocca, C. ; Clarke, P. E.L. ; Clay, E. ; Cohen, I. ; Conboy, J. E. ; Cooke, O. C. ; Couchman, J. ; Couyoumtzelis, C. ; Coxe, R. L. ; Cuffiani, M. ; Dado, S. ; Dallavalle, G. M. ; Dallison, S. ; Darling, C. ; Davis, R. ; De Jong, S. ; de Roeck, A. ; Dervan, P. ; Desch, K. ; Dienes, B. ; Dixit, M. S. ; Donkers, M. ; Dubbert, J. ; Duchovni, E. ; Duckeck, G. ; Duerdoth, I. P. ; Estabrooks, P. G. ; Etzion, E. ; Evans, H. ; Fabbri, F. ; Fanfani, A. ; Fanti, M. ; Faust, A. A. ; Feld, L. ; Ferrari, P. ; Fiedler, F. ; Fierro, M. ; Fleck, I. ; Foucher, M. ; Frey, A. ; Fürtjes, A. ; Futyan, D. I. ; Gagnon, P. ; Gary, J. W. ; Gascon-Shotkin, S. ; Gaycken, G. ; Geich-Gimbel, C. ; Giacomelli, G. ; Giacomelli, P. ; Giacomelli, R. ; Gibson, W. R. ; Gingrich, D. M. ; Glenzinski, D. ; Goldberg, J. ; Gorn, W. ; Grandi, C. ; Graham, K. ; Gross, E. ; Grunhaus, J. ; Gruwé, M. ; Hajdu, C. ; Hanson, G. G. ; Hansroul, M. ; Hapke, M. ; Harder, K. ; Harel, A. ; Hargrove, C. K. ; Harin-Dirac, M. ; Hart, P. ; Hauschild, M. ; Hawkes, C. M. ; Hawkings, R. ; Hemingway, R. J. ; Herten, G. ; Heuer, R. D. ; Hildreth, M. D. ; Hill, J. C. ; Hillier, S. ; Hobson, P. R. ; Hocker, A. ; Hoffman, K. ; Homer, R. J. ; Honma, A. K. ; Horváth, D. ; Hossain, K. R. ; Howard, R. ; Hüntemeyer, P. ; Igo-Kemenes, P. ; Imrie, D. C. ; Ishii, K. ; Jacob, F. R. ; Jawahery, A. ; Jeremie, H. ; Jimack, M. ; Jones, C. R. ; Jovanovic, P. ; Junk, T. R. ; Kanaya, N. ; Kanzaki, J. ; Karlen, D. ; Kartvelishvili, V. ; Kawagoe, K. ; Kawamoto, T. ; Kayal, P. I. ; Keeler, R. K. ; Kellogg, R. G. ; Kennedy, B. W. ; Kim, D. H. ; Kirk, J. ; Klier, A. ; Kobayashi, T. ; Kobel, M. ; Kokott, T. P. ; Kolrep, M. ; Komamiya, Sachio ; Kowalewski, R. V. ; Kress, T. ; Krieger, P. ; von Krogh, J. ; Kuhl, T. ; Kyberd, P. ; Lai, W. P. ; Lafferty, G. D. ; Lahmann, R. ; Landsman, H. ; Lanske, D. ; Lauber, J. ; Lawson, I. ; Layter, J. G. ; Lee, A. M. ; Lellouch, D. ; Letts, J. ; Levinson, L. ; Liebisch, R. ; Lillich, J. ; List, B. ; Littlewood, C. ; Lloyd, A. W. ; Lloyd, S. L. ; Loebinger, F. K. ; Long, G. D. ; Losty, M. J. ; Lu, J. ; Ludwig, J. ; Liu, D. ; Macchiolo, A. ; Macpherson, A. ; Mader, W. ; Mannelli, M. ; Marcellini, S. ; Marchant, T. E. ; Martin, A. J. ; Martin, J. P. ; Martinez, G. ; Mashimo, T. ; Mättig, P. ; McDonald, W. J. ; McKenna, J. ; Mckigney, E. A. ; McMahon, T. J. ; McPherson, R. A. ; Meijers, F. ; Mendez-Lorenzo, P. ; Menke, S. ; Merritt, F. S. ; Mes, H. ; Meyer, I. ; Michelini, A. ; Mihara, S. ; Mikenberg, G. ; Miller, D. J. ; Mohr, W. ; Montanari, A. ; Mori, T. ; Müller, U. ; Nagai, K. ; Nakamura, I. ; Neal, H. A. ; Nisius, R. ; O'Neale, S. W. ; Oakham, F. G. ; Odorici, F. ; Ogren, H. O. ; Okpara, A. ; Oreglia, M. J. ; Orito, S. ; Palmonari, F. ; Pásztor, G. ; Pater, J. R. ; Patrick, G. N. ; Patt, J. ; Perez-Ochoa, R. ; Petzold, S. ; Pfeifenschneider, P. ; Pilcher, J. E. ; Pinfold, J. ; Plane, D. E. ; Poffenberger, P. ; Poli, B. ; Polok, J. ; Przybycień, M. ; Quadt, A. ; Raith, B. ; Rembser, C. ; Rick, H. ; Robertson, S. ; Robins, S. A. ; Rodning, N. ; Roney, J. M. ; Rosati, S. ; Roscoe, K. ; Rossi, A. M. ; Rozen, Y. ; Runge, K. ; Runolfsson, O. ; Rust, D. R. ; Sachs, K. ; Saeki, T. ; Sahr, O. ; Sang, W. M. ; Sarkisyan, E. K.G. ; Sbarra, C. ; Schaile, A. D. ; Schaile, O. ; Scharff-Hansen, P. ; Schieck, J. ; Schmitt, B. ; Schmitt, S. ; Schöning, A. ; Schröder, M. ; Schumacher, M. ; Schwick, C. ; Scott, W. G. ; Seuster, R. ; Shears, T. G. ; Shen, B. C. ; Shepherd-Themistocleous, C. H. ; Sherwood, P. ; Siroli, G. P. ; Skuja, A. ; Smith, A. M. ; Snow, G. A. ; Sobie, R. ; Söldner-Rembold, S. ; Spagnolo, S. ; Springer, W. ; Sproston, M. ; Stahl, A. ; Stephens, K. ; Stoll, K. ; Strom, D. ; Ströhmer, R. ; Surrow, B. ; Talbot, S. D. ; Taras, P. ; Tarem, S. ; Tecchio, M. ; Teuscher, R. ; Thiergen, M. ; Thomas, J. ; Thomson, M. A. ; Torrence, E. ; Towers, S. ; Trefzger, T. ; Trigger, I. ; Trócsányi, Z. ; Tsur, E. ; Turner-Watson, M. F. ; Ueda, I. ; Van Kooten, R. ; Vannerem, P. ; Verzocchi, M. ; Voss, H. ; Wäckerle, F. ; Wagner, A. ; Wagner, D. ; Waller, D. ; Ward, C. P. ; Ward, D. R. ; Watkins, P. M. ; Watson, A. T. ; Watson, N. K. ; Wells, P. S. ; Wermes, N. ; Wetterling, D. ; White, J. S. ; Wilson, G. W. ; Wilson, J. A. ; Wyatt, T. R. ; Yamashita, S. ; Zacek, V. ; Zer-Zion, D. / Precision luminosity for Z0 lineshape measurements with a silicon-tungsten calorimeter : The opal collaboration. In: European Physical Journal C. 2000 ; Vol. 14, No. 3. pp. 373-425.
@article{fda515fe17ff469ea3fef63b80c47ad6,
title = "Precision luminosity for Z0 lineshape measurements with a silicon-tungsten calorimeter: The opal collaboration",
abstract = "The measurement of small-angle Bhabha scattering is used to determine the luminosity at the OPAL interaction point for the LEP I data recorded between 1993 and 1995. The measurement is based on the OPAL Silicon-Tungsten Luminometer which is composed of two calorimeters encircling the LEP beam pipe, on opposite sides of the interaction point. The luminometer detects electrons from small-angle Bhabha scattering at angles between 25 and 58 mrad. At LEP center-of-mass energies around the Z0, about half of all Bhabha electrons entering the detector fall within a 79 nb fiducial acceptance region. The electromagnetic showers generated in the stack of 1 radiation length tungsten absorber plates are sampled by 608 silicon detectors with 38,912 radial pads of 2.5 mm width. The fine segmentation of the detector, combined with the precise knowledge of its physical dimensions, allows the trajectories of incoming 45 GeV electrons or photons to be determined with a total systematic error of less than 7 microns. We have quantified all significant sources of systematic experimental error in the luminosity determination by direct physical measurement. All measured properites of the luminosity event sample are found to be in agreement with current theoretical expectations. The total systematic measurement uncertainty is 3.4 × 10-4, significantly below the theoretical error of 5.4 × 10-4 currently assigned to the QED calculation of the Bhabha acceptance, and contributes negligibly to the total uncertainty in the OPAL measurement of Γinv/Γℓ+ℓ-, a quantity of basic physical interest which depends crucially on the luminosity measurement.",
author = "G. Abbiendi and K. Ackerstaff and G. Alexander and J. Allison and Anderson, {K. J.} and S. Anderson and S. Arcelli and S. Asai and Ashby, {S. F.} and D. Axen and G. Azuelos and Ball, {A. H.} and E. Barberio and Barlow, {R. J.} and Batley, {J. R.} and S. Baumann and J. Bechtlu and T. Behnke and Bell, {K. W.} and G. Bella and A. Bellerive and S. Bentvelsen and S. Bethke and S. Betts and O. Biebel and A. Biguzzi and Bloodworth, {I. J.} and P. Bock and J. B{\"o}hme and O. Boeriu and D. Bonacorsi and M. Boutemeur and S. Braibant and P. Bright-Thomas and L. Brigliadori and Brown, {R. M.} and Burckhart, {H. J.} and P. Capiluppi and Carnegie, {R. K.} and Carter, {A. A.} and Carter, {J. R.} and Chang, {C. Y.} and Charlton, {D. G.} and D. Chrisman and C. Ciocca and Clarke, {P. E.L.} and E. Clay and I. Cohen and Conboy, {J. E.} and Cooke, {O. C.} and J. Couchman and C. Couyoumtzelis and Coxe, {R. L.} and M. Cuffiani and S. Dado and Dallavalle, {G. M.} and S. Dallison and C. Darling and R. Davis and {De Jong}, S. and {de Roeck}, A. and P. Dervan and K. Desch and B. Dienes and Dixit, {M. S.} and M. Donkers and J. Dubbert and E. Duchovni and G. Duckeck and Duerdoth, {I. P.} and Estabrooks, {P. G.} and E. Etzion and H. Evans and F. Fabbri and A. Fanfani and M. Fanti and Faust, {A. A.} and L. Feld and P. Ferrari and F. Fiedler and M. Fierro and I. Fleck and M. Foucher and A. Frey and A. F{\"u}rtjes and Futyan, {D. I.} and P. Gagnon and Gary, {J. W.} and S. Gascon-Shotkin and G. Gaycken and C. Geich-Gimbel and G. Giacomelli and P. Giacomelli and R. Giacomelli and Gibson, {W. R.} and Gingrich, {D. M.} and D. Glenzinski and J. Goldberg and W. Gorn and C. Grandi and K. Graham and E. Gross and J. Grunhaus and M. Gruw{\'e} and C. Hajdu and Hanson, {G. G.} and M. Hansroul and M. Hapke and K. Harder and A. Harel and Hargrove, {C. K.} and M. Harin-Dirac and P. Hart and M. Hauschild and Hawkes, {C. M.} and R. Hawkings and Hemingway, {R. J.} and G. Herten and Heuer, {R. D.} and Hildreth, {M. D.} and Hill, {J. C.} and S. Hillier and Hobson, {P. R.} and A. Hocker and K. Hoffman and Homer, {R. J.} and Honma, {A. K.} and D. Horv{\'a}th and Hossain, {K. R.} and R. Howard and P. H{\"u}ntemeyer and P. Igo-Kemenes and Imrie, {D. C.} and K. Ishii and Jacob, {F. R.} and A. Jawahery and H. Jeremie and M. Jimack and Jones, {C. R.} and P. Jovanovic and Junk, {T. R.} and N. Kanaya and J. Kanzaki and D. Karlen and V. Kartvelishvili and K. Kawagoe and T. Kawamoto and Kayal, {P. I.} and Keeler, {R. K.} and Kellogg, {R. G.} and Kennedy, {B. W.} and Kim, {D. H.} and J. Kirk and A. Klier and T. Kobayashi and M. Kobel and Kokott, {T. P.} and M. Kolrep and Sachio Komamiya and Kowalewski, {R. V.} and T. Kress and P. Krieger and {von Krogh}, J. and T. Kuhl and P. Kyberd and Lai, {W. P.} and Lafferty, {G. D.} and R. Lahmann and H. Landsman and D. Lanske and J. Lauber and I. Lawson and Layter, {J. G.} and Lee, {A. M.} and D. Lellouch and J. Letts and L. Levinson and R. Liebisch and J. Lillich and B. List and C. Littlewood and Lloyd, {A. W.} and Lloyd, {S. L.} and Loebinger, {F. K.} and Long, {G. D.} and Losty, {M. J.} and J. Lu and J. Ludwig and D. Liu and A. Macchiolo and A. Macpherson and W. Mader and M. Mannelli and S. Marcellini and Marchant, {T. E.} and Martin, {A. J.} and Martin, {J. P.} and G. Martinez and T. Mashimo and P. M{\"a}ttig and McDonald, {W. J.} and J. McKenna and Mckigney, {E. A.} and McMahon, {T. J.} and McPherson, {R. A.} and F. Meijers and P. Mendez-Lorenzo and S. Menke and Merritt, {F. S.} and H. Mes and I. Meyer and A. Michelini and S. Mihara and G. Mikenberg and Miller, {D. J.} and W. Mohr and A. Montanari and T. Mori and U. M{\"u}ller and K. Nagai and I. Nakamura and Neal, {H. A.} and R. Nisius and O'Neale, {S. W.} and Oakham, {F. G.} and F. Odorici and Ogren, {H. O.} and A. Okpara and Oreglia, {M. J.} and S. Orito and F. Palmonari and G. P{\'a}sztor and Pater, {J. R.} and Patrick, {G. N.} and J. Patt and R. Perez-Ochoa and S. Petzold and P. Pfeifenschneider and Pilcher, {J. E.} and J. Pinfold and Plane, {D. E.} and P. Poffenberger and B. Poli and J. Polok and M. Przybycień and A. Quadt and B. Raith and C. Rembser and H. Rick and S. Robertson and Robins, {S. A.} and N. Rodning and Roney, {J. M.} and S. Rosati and K. Roscoe and Rossi, {A. M.} and Y. Rozen and K. Runge and O. Runolfsson and Rust, {D. R.} and K. Sachs and T. Saeki and O. Sahr and Sang, {W. M.} and Sarkisyan, {E. K.G.} and C. Sbarra and Schaile, {A. D.} and O. Schaile and P. Scharff-Hansen and J. Schieck and B. Schmitt and S. Schmitt and A. Sch{\"o}ning and M. Schr{\"o}der and M. Schumacher and C. Schwick and Scott, {W. G.} and R. Seuster and Shears, {T. G.} and Shen, {B. C.} and Shepherd-Themistocleous, {C. H.} and P. Sherwood and Siroli, {G. P.} and A. Skuja and Smith, {A. M.} and Snow, {G. A.} and R. Sobie and S. S{\"o}ldner-Rembold and S. Spagnolo and W. Springer and M. Sproston and A. Stahl and K. Stephens and K. Stoll and D. Strom and R. Str{\"o}hmer and B. Surrow and Talbot, {S. D.} and P. Taras and S. Tarem and M. Tecchio and R. Teuscher and M. Thiergen and J. Thomas and Thomson, {M. A.} and E. Torrence and S. Towers and T. Trefzger and I. Trigger and Z. Tr{\'o}cs{\'a}nyi and E. Tsur and Turner-Watson, {M. F.} and I. Ueda and {Van Kooten}, R. and P. Vannerem and M. Verzocchi and H. Voss and F. W{\"a}ckerle and A. Wagner and D. Wagner and D. Waller and Ward, {C. P.} and Ward, {D. R.} and Watkins, {P. M.} and Watson, {A. T.} and Watson, {N. K.} and Wells, {P. S.} and N. Wermes and D. Wetterling and White, {J. S.} and Wilson, {G. W.} and Wilson, {J. A.} and Wyatt, {T. R.} and S. Yamashita and V. Zacek and D. Zer-Zion",
year = "2000",
month = "1",
day = "1",
language = "English",
volume = "14",
pages = "373--425",
journal = "European Physical Journal C",
issn = "1434-6044",
publisher = "Springer New York",
number = "3",

}

TY - JOUR

T1 - Precision luminosity for Z0 lineshape measurements with a silicon-tungsten calorimeter

T2 - The opal collaboration

AU - Abbiendi, G.

AU - Ackerstaff, K.

AU - Alexander, G.

AU - Allison, J.

AU - Anderson, K. J.

AU - Anderson, S.

AU - Arcelli, S.

AU - Asai, S.

AU - Ashby, S. F.

AU - Axen, D.

AU - Azuelos, G.

AU - Ball, A. H.

AU - Barberio, E.

AU - Barlow, R. J.

AU - Batley, J. R.

AU - Baumann, S.

AU - Bechtlu, J.

AU - Behnke, T.

AU - Bell, K. W.

AU - Bella, G.

AU - Bellerive, A.

AU - Bentvelsen, S.

AU - Bethke, S.

AU - Betts, S.

AU - Biebel, O.

AU - Biguzzi, A.

AU - Bloodworth, I. J.

AU - Bock, P.

AU - Böhme, J.

AU - Boeriu, O.

AU - Bonacorsi, D.

AU - Boutemeur, M.

AU - Braibant, S.

AU - Bright-Thomas, P.

AU - Brigliadori, L.

AU - Brown, R. M.

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 - Chrisman, D.

AU - Ciocca, C.

AU - Clarke, P. E.L.

AU - Clay, E.

AU - Cohen, I.

AU - Conboy, J. E.

AU - Cooke, O. C.

AU - Couchman, J.

AU - Couyoumtzelis, C.

AU - Coxe, R. L.

AU - Cuffiani, M.

AU - Dado, S.

AU - Dallavalle, G. M.

AU - Dallison, S.

AU - Darling, C.

AU - Davis, R.

AU - De Jong, S.

AU - de Roeck, A.

AU - Dervan, P.

AU - Desch, K.

AU - Dienes, B.

AU - Dixit, M. S.

AU - Donkers, M.

AU - Dubbert, J.

AU - Duchovni, E.

AU - Duckeck, G.

AU - Duerdoth, I. P.

AU - Estabrooks, P. G.

AU - Etzion, E.

AU - Evans, H.

AU - Fabbri, F.

AU - Fanfani, A.

AU - Fanti, M.

AU - Faust, A. A.

AU - Feld, L.

AU - Ferrari, P.

AU - Fiedler, F.

AU - Fierro, M.

AU - Fleck, I.

AU - Foucher, M.

AU - Frey, A.

AU - Fürtjes, A.

AU - Futyan, D. I.

AU - Gagnon, P.

AU - Gary, J. W.

AU - Gascon-Shotkin, S.

AU - Gaycken, G.

AU - Geich-Gimbel, C.

AU - Giacomelli, G.

AU - Giacomelli, P.

AU - Giacomelli, R.

AU - Gibson, W. R.

AU - Gingrich, D. M.

AU - Glenzinski, D.

AU - Goldberg, J.

AU - Gorn, W.

AU - Grandi, C.

AU - Graham, K.

AU - Gross, E.

AU - Grunhaus, J.

AU - Gruwé, M.

AU - Hajdu, C.

AU - Hanson, G. G.

AU - Hansroul, M.

AU - Hapke, M.

AU - Harder, K.

AU - Harel, A.

AU - Hargrove, C. K.

AU - Harin-Dirac, M.

AU - Hart, P.

AU - Hauschild, M.

AU - Hawkes, C. M.

AU - Hawkings, R.

AU - Hemingway, R. J.

AU - Herten, G.

AU - Heuer, R. D.

AU - Hildreth, M. D.

AU - Hill, J. C.

AU - Hillier, S.

AU - Hobson, P. R.

AU - Hocker, A.

AU - Hoffman, K.

AU - Homer, R. J.

AU - Honma, A. K.

AU - Horváth, D.

AU - Hossain, K. R.

AU - Howard, R.

AU - Hüntemeyer, P.

AU - Igo-Kemenes, P.

AU - Imrie, D. C.

AU - Ishii, K.

AU - Jacob, F. R.

AU - Jawahery, A.

AU - Jeremie, H.

AU - Jimack, M.

AU - Jones, C. R.

AU - Jovanovic, P.

AU - Junk, T. R.

AU - Kanaya, N.

AU - Kanzaki, J.

AU - Karlen, D.

AU - Kartvelishvili, V.

AU - Kawagoe, K.

AU - Kawamoto, T.

AU - Kayal, P. I.

AU - Keeler, R. K.

AU - Kellogg, R. G.

AU - Kennedy, B. W.

AU - Kim, D. H.

AU - Kirk, J.

AU - Klier, A.

AU - Kobayashi, T.

AU - Kobel, M.

AU - Kokott, T. P.

AU - Kolrep, M.

AU - Komamiya, Sachio

AU - Kowalewski, R. V.

AU - Kress, T.

AU - Krieger, P.

AU - von Krogh, J.

AU - Kuhl, T.

AU - Kyberd, P.

AU - Lai, W. P.

AU - Lafferty, G. D.

AU - Lahmann, R.

AU - Landsman, H.

AU - Lanske, D.

AU - Lauber, J.

AU - Lawson, I.

AU - Layter, J. G.

AU - Lee, A. M.

AU - Lellouch, D.

AU - Letts, J.

AU - Levinson, L.

AU - Liebisch, R.

AU - Lillich, J.

AU - List, B.

AU - Littlewood, C.

AU - Lloyd, A. W.

AU - Lloyd, S. L.

AU - Loebinger, F. K.

AU - Long, G. D.

AU - Losty, M. J.

AU - Lu, J.

AU - Ludwig, J.

AU - Liu, D.

AU - Macchiolo, A.

AU - Macpherson, A.

AU - Mader, W.

AU - Mannelli, M.

AU - Marcellini, S.

AU - Marchant, T. E.

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 - Mendez-Lorenzo, P.

AU - Menke, S.

AU - Merritt, F. S.

AU - Mes, H.

AU - Meyer, I.

AU - Michelini, A.

AU - Mihara, S.

AU - Mikenberg, G.

AU - Miller, D. J.

AU - Mohr, W.

AU - Montanari, A.

AU - Mori, T.

AU - Müller, U.

AU - Nagai, K.

AU - Nakamura, I.

AU - Neal, H. A.

AU - Nisius, R.

AU - O'Neale, S. W.

AU - Oakham, F. G.

AU - Odorici, F.

AU - Ogren, H. O.

AU - Okpara, A.

AU - Oreglia, M. J.

AU - Orito, S.

AU - Palmonari, F.

AU - Pásztor, G.

AU - Pater, J. R.

AU - Patrick, G. N.

AU - Patt, J.

AU - Perez-Ochoa, R.

AU - Petzold, S.

AU - Pfeifenschneider, P.

AU - Pilcher, J. E.

AU - Pinfold, J.

AU - Plane, D. E.

AU - Poffenberger, P.

AU - Poli, B.

AU - Polok, J.

AU - Przybycień, M.

AU - Quadt, A.

AU - Raith, B.

AU - Rembser, C.

AU - Rick, H.

AU - Robertson, S.

AU - Robins, S. A.

AU - Rodning, N.

AU - Roney, J. M.

AU - Rosati, S.

AU - Roscoe, K.

AU - Rossi, A. M.

AU - Rozen, Y.

AU - Runge, K.

AU - Runolfsson, O.

AU - Rust, D. R.

AU - Sachs, K.

AU - Saeki, T.

AU - Sahr, O.

AU - Sang, W. M.

AU - Sarkisyan, E. K.G.

AU - Sbarra, C.

AU - Schaile, A. D.

AU - Schaile, O.

AU - Scharff-Hansen, P.

AU - Schieck, J.

AU - Schmitt, B.

AU - Schmitt, S.

AU - Schöning, A.

AU - Schröder, M.

AU - Schumacher, M.

AU - Schwick, C.

AU - Scott, W. G.

AU - Seuster, R.

AU - Shears, T. G.

AU - Shen, B. C.

AU - Shepherd-Themistocleous, C. H.

AU - Sherwood, P.

AU - Siroli, G. P.

AU - Skuja, A.

AU - Smith, A. M.

AU - Snow, G. A.

AU - Sobie, R.

AU - Söldner-Rembold, S.

AU - Spagnolo, S.

AU - Springer, W.

AU - Sproston, M.

AU - Stahl, A.

AU - Stephens, K.

AU - Stoll, K.

AU - Strom, D.

AU - Ströhmer, R.

AU - Surrow, B.

AU - Talbot, S. D.

AU - Taras, P.

AU - Tarem, S.

AU - Tecchio, M.

AU - Teuscher, R.

AU - Thiergen, M.

AU - Thomas, J.

AU - Thomson, M. A.

AU - Torrence, E.

AU - Towers, S.

AU - Trefzger, T.

AU - Trigger, I.

AU - Trócsányi, Z.

AU - Tsur, E.

AU - Turner-Watson, M. F.

AU - Ueda, I.

AU - Van Kooten, R.

AU - Vannerem, P.

AU - Verzocchi, M.

AU - Voss, H.

AU - Wäckerle, F.

AU - Wagner, A.

AU - Wagner, D.

AU - Waller, D.

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 - Wetterling, D.

AU - White, J. S.

AU - Wilson, G. W.

AU - Wilson, J. A.

AU - Wyatt, T. R.

AU - Yamashita, S.

AU - Zacek, V.

AU - Zer-Zion, D.

PY - 2000/1/1

Y1 - 2000/1/1

N2 - The measurement of small-angle Bhabha scattering is used to determine the luminosity at the OPAL interaction point for the LEP I data recorded between 1993 and 1995. The measurement is based on the OPAL Silicon-Tungsten Luminometer which is composed of two calorimeters encircling the LEP beam pipe, on opposite sides of the interaction point. The luminometer detects electrons from small-angle Bhabha scattering at angles between 25 and 58 mrad. At LEP center-of-mass energies around the Z0, about half of all Bhabha electrons entering the detector fall within a 79 nb fiducial acceptance region. The electromagnetic showers generated in the stack of 1 radiation length tungsten absorber plates are sampled by 608 silicon detectors with 38,912 radial pads of 2.5 mm width. The fine segmentation of the detector, combined with the precise knowledge of its physical dimensions, allows the trajectories of incoming 45 GeV electrons or photons to be determined with a total systematic error of less than 7 microns. We have quantified all significant sources of systematic experimental error in the luminosity determination by direct physical measurement. All measured properites of the luminosity event sample are found to be in agreement with current theoretical expectations. The total systematic measurement uncertainty is 3.4 × 10-4, significantly below the theoretical error of 5.4 × 10-4 currently assigned to the QED calculation of the Bhabha acceptance, and contributes negligibly to the total uncertainty in the OPAL measurement of Γinv/Γℓ+ℓ-, a quantity of basic physical interest which depends crucially on the luminosity measurement.

AB - The measurement of small-angle Bhabha scattering is used to determine the luminosity at the OPAL interaction point for the LEP I data recorded between 1993 and 1995. The measurement is based on the OPAL Silicon-Tungsten Luminometer which is composed of two calorimeters encircling the LEP beam pipe, on opposite sides of the interaction point. The luminometer detects electrons from small-angle Bhabha scattering at angles between 25 and 58 mrad. At LEP center-of-mass energies around the Z0, about half of all Bhabha electrons entering the detector fall within a 79 nb fiducial acceptance region. The electromagnetic showers generated in the stack of 1 radiation length tungsten absorber plates are sampled by 608 silicon detectors with 38,912 radial pads of 2.5 mm width. The fine segmentation of the detector, combined with the precise knowledge of its physical dimensions, allows the trajectories of incoming 45 GeV electrons or photons to be determined with a total systematic error of less than 7 microns. We have quantified all significant sources of systematic experimental error in the luminosity determination by direct physical measurement. All measured properites of the luminosity event sample are found to be in agreement with current theoretical expectations. The total systematic measurement uncertainty is 3.4 × 10-4, significantly below the theoretical error of 5.4 × 10-4 currently assigned to the QED calculation of the Bhabha acceptance, and contributes negligibly to the total uncertainty in the OPAL measurement of Γinv/Γℓ+ℓ-, a quantity of basic physical interest which depends crucially on the luminosity measurement.

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M3 - Article

AN - SCOPUS:0000650940

VL - 14

SP - 373

EP - 425

JO - European Physical Journal C

JF - European Physical Journal C

SN - 1434-6044

IS - 3

ER -