Measurement of the running of the QED coupling in small-angle Bhabha scattering at LEP

G. Abbiendi; C. Ainsley; P. F. Åkesson; G. Alexander; G. Anagnostou; K. J. Anderson; S. Asai; D. Axen; I. Bailey; E. Barberio; T. Barillari; R. J. Barlow; R. J. Batley; P. Bechtle; T. Behnke; K. W. Bell; P. J. Bell; G. Bella; A. Bellerive; G. Benelli; S. Bethke; O. Biebel; O. Boeriu; P. Bock; M. Boutemeur; S. Braibant; R. M. Brown; H. J. Burckhart; S. Campana; P. Capiluppi; R. K. Carnegie; A. A. Carter; J. R. Carter; C. Y. Chang; D. G. Charlton; C. Ciocca; A. Csilling; M. Cuffiani; S. Dado; G. M. Dallavalle; A. de Roeck; E. A. de Wolf; K. Desch; B. Dienes; J. Dubbert; E. Duchovni; G. Duckeck; I. P. Duerdoth; E. Etzion; F. Fabbri; P. Ferrari; F. Fiedler; I. Fleck; M. Ford; A. Frey; P. Gagnon; J. W. Gary; C. Geich-Gimbel; G. Giacomelli; P. Giacomelli; R. Giacomelli; M. Giunta; J. Goldberg; E. Gross; J. Grunhaus; M. Gruwé; P. O. Günther; A. Gupta; C. Hajdu; M. Hamann; G. G. Hanson; A. Harel; M. Hauschild; C. M. Hawkes; R. Hawkings; R. J. Hemingway; G. Herten; R. D. Heuer; J. C. Hill; D. Horváth; P. Igo-Kemenes; K. Ishii; H. Jeremie; P. Jovanovic; T. R. Junk; J. Kanzaki; D. Karlen; K. Kawagoe; T. Kawamoto; R. K. Keeler; R. G. Kellogg; B. W. Kennedy; S. Kluth; T. Kobayashi; M. Kobel; S. Komamiya; T. Krämer; P. Krieger; J. von Krogh; T. Kuhl; M. Kupper; G. D. Lafferty; H. Landsman; D. Lanske; D. Lellouch; J. Letts; L. Levinson; J. Lillich; S. L. Lloyd; F. K. Loebinger; J. Lu; A. Ludwig; J. Ludwig; W. Mader; S. Marcellini; A. J. Martin; T. Mashimo; P. Mättig; J. McKenna; R. A. McPherson; F. Meijers; W. Menges; F. S. Merritt; H. Mes; N. Meyer; A. Michelini; S. Mihara; G. Mikenberg; D. J. Miller; W. Mohr; T. Mori; A. Mutter; K. Nagai; I. Nakamura; H. Nanjo; H. A. Neal; R. Nisius; S. W. O'Neale; A. Oh; M. J. Oreglia; S. Orito; C. Pahl; G. Pásztor; J. R. Pater; J. E. Pilcher; J. Pinfold; D. E. Plane; O. Pooth; M. Przybycień; A. Quadt; K. Rabbertz; C. Rembser; P. Renkel; J. M. Roney; A. M. Rossi; Y. Rozen; K. Runge; K. Sachs; T. Saeki; E. K.G. Sarkisyan; A. D. Schaile; O. Schaile; P. Scharff-Hansen; J. Schieck; T. Schörner-Sadenius; M. Schröder; M. Schumacher; R. Seuster; T. G. Shears; B. C. Shen; P. Sherwood; A. Skuja; A. M. Smith; R. Sobie; S. Söldner-Rembold; F. Spano; A. Stahl; D. Strom; R. Ströhmer; S. Tarem; M. Tasevsky; R. Teuscher; M. A. Thomson; E. Torrence; D. Toya; P. Tran; I. Trigger; Z. Trócsányi; E. Tsur; M. F. Turner-Watson; I. Ueda; B. Ujvári; C. F. Vollmer; P. Vannerem; R. Vértesi; M. Verzocchi; H. Voss; J. Vossebeld; C. P. Ward; D. R. Ward; P. M. Watkins; A. T. Watson; N. K. Watson; P. S. Wells; T. Wengler; N. Wermes; G. W. Wilson; J. A. Wilson; G. Wolf; T. R. Wyatt; S. Yamashita; D. Zer-Zion; L. Zivkovic

doi:10.1140/epjc/s2005-02389-3

Measurement of the running of the QED coupling in small-angle Bhabha scattering at LEP

G. Abbiendi^*, C. Ainsley, P. F. Åkesson, G. Alexander, G. Anagnostou, K. J. Anderson, S. Asai, D. Axen, I. Bailey, E. Barberio, T. Barillari, R. J. Barlow, R. J. Batley, P. Bechtle, T. Behnke, K. W. Bell, P. J. Bell, G. Bella, A. Bellerive, G. BenelliS. Bethke, O. Biebel, O. Boeriu, P. Bock, M. Boutemeur, S. Braibant, R. M. Brown, H. J. Burckhart, S. Campana, P. Capiluppi, R. K. Carnegie, A. A. Carter, J. R. Carter, C. Y. Chang, D. G. Charlton, C. Ciocca, A. Csilling, M. Cuffiani, S. Dado, G. M. Dallavalle, A. de Roeck, E. A. de Wolf, K. Desch, B. Dienes, J. Dubbert, E. Duchovni, G. Duckeck, I. P. Duerdoth, E. Etzion, F. Fabbri, P. Ferrari, F. Fiedler, I. Fleck, M. Ford, A. Frey, P. Gagnon, J. W. Gary, C. Geich-Gimbel, G. Giacomelli, P. Giacomelli, R. Giacomelli, M. Giunta, J. Goldberg, E. Gross, J. Grunhaus, M. Gruwé, P. O. Günther, A. Gupta, C. Hajdu, M. Hamann, G. G. Hanson, A. Harel, M. Hauschild, C. M. Hawkes, R. Hawkings, R. J. Hemingway, G. Herten, R. D. Heuer, J. C. Hill, D. Horváth, P. Igo-Kemenes, K. Ishii, H. Jeremie, P. Jovanovic, T. R. Junk, J. Kanzaki, D. Karlen, K. Kawagoe, T. Kawamoto, R. K. Keeler, R. G. Kellogg, B. W. Kennedy, S. Kluth, T. Kobayashi, M. Kobel, S. Komamiya, T. Krämer, P. Krieger, J. von Krogh, T. Kuhl, M. Kupper, G. D. Lafferty, H. Landsman, D. Lanske, D. Lellouch, J. Letts, L. Levinson, J. Lillich, S. L. Lloyd, F. K. Loebinger, J. Lu, A. Ludwig, J. Ludwig, W. Mader, S. Marcellini, A. J. Martin, T. Mashimo, P. Mättig, J. McKenna, R. A. McPherson, F. Meijers, W. Menges, F. S. Merritt, H. Mes, N. Meyer, A. Michelini, S. Mihara, G. Mikenberg, D. J. Miller, W. Mohr, T. Mori, A. Mutter, K. Nagai, I. Nakamura, H. Nanjo, H. A. Neal, R. Nisius, S. W. O'Neale, A. Oh, M. J. Oreglia, S. Orito, C. Pahl, G. Pásztor, J. R. Pater, J. E. Pilcher, J. Pinfold, D. E. Plane, O. Pooth, M. Przybycień, A. Quadt, K. Rabbertz, C. Rembser, P. Renkel, J. M. Roney, A. M. Rossi, Y. Rozen, K. Runge, K. Sachs, T. Saeki, E. K.G. Sarkisyan, A. D. Schaile, O. Schaile, P. Scharff-Hansen, J. Schieck, T. Schörner-Sadenius, M. Schröder, M. Schumacher, R. Seuster, T. G. Shears, B. C. Shen, P. Sherwood, A. Skuja, A. M. Smith, R. Sobie, S. Söldner-Rembold, F. Spano, A. Stahl, D. Strom, R. Ströhmer, S. Tarem, M. Tasevsky, R. Teuscher, M. A. Thomson, E. Torrence, D. Toya, P. Tran, I. Trigger, Z. Trócsányi, E. Tsur, M. F. Turner-Watson, I. Ueda, B. Ujvári, C. F. Vollmer, P. Vannerem, R. Vértesi, M. Verzocchi, H. Voss, J. Vossebeld, C. P. Ward, D. R. Ward, P. M. Watkins, A. T. Watson, N. K. Watson, P. S. Wells, T. Wengler, N. Wermes, G. W. Wilson, J. A. Wilson, G. Wolf, T. R. Wyatt, S. Yamashita, D. Zer-Zion, L. Zivkovic

^*この研究の対応する著者

研究成果: Article › 査読

45 被引用数 (Scopus)

抄録

Using the OPAL detector at LEP, the running of the effective QED coupling α(t) is measured for space-like momentum transfer from the angular distribution of small-angle Bhabha scattering. In an almost ideal QED framework, with very favourable experimental conditions, we obtain: Δα(-6.07 GeV²) - Δα(-1.81 GeV²) = (440 ± 58 ± 43 ± 30) × 10^-5, where the first error is statistical, the second is the experimental systematic and the third is the theoretical uncertainty. This agrees with current evaluations of α(t). The null hypothesis that α remains constant within the above interval of -t is excluded with a significance above 5σ. Similarly, our results are inconsistent at the level of 3 σ with the hypothesis that only leptonic loops contribute to the running. This is currently the most significant direct measurement where the running α(t) is probed differentially within the measured t range.

本文言語	English
ページ（範囲）	1-21
ページ数	21
ジャーナル	European Physical Journal C
巻	45
号	1
DOI	https://doi.org/10.1140/epjc/s2005-02389-3
出版ステータス	Published - 2006 1月
外部発表	はい

ASJC Scopus subject areas

工学（その他）
物理学および天文学（その他）

文献へのアクセス

10.1140/epjc/s2005-02389-3

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引用スタイル

Abbiendi, G., Ainsley, C., Åkesson, P. F., Alexander, G., Anagnostou, G., Anderson, K. J., Asai, S., Axen, D., Bailey, I., Barberio, E., Barillari, T., Barlow, R. J., Batley, R. J., Bechtle, P., Behnke, T., Bell, K. W., Bell, P. J., Bella, G., Bellerive, A., ... Zivkovic, L. (2006). Measurement of the running of the QED coupling in small-angle Bhabha scattering at LEP. European Physical Journal C, 45(1), 1-21. https://doi.org/10.1140/epjc/s2005-02389-3

Abbiendi, G, Ainsley, C, Åkesson, PF, Alexander, G, Anagnostou, G, Anderson, KJ, Asai, S, Axen, D, Bailey, I, Barberio, E, Barillari, T, Barlow, RJ, Batley, RJ, Bechtle, P, Behnke, T, Bell, KW, Bell, PJ, Bella, G, Bellerive, A, Benelli, G, Bethke, S, Biebel, O, Boeriu, O, Bock, P, Boutemeur, M, Braibant, S, Brown, RM, Burckhart, HJ, Campana, S, Capiluppi, P, Carnegie, RK, Carter, AA, Carter, JR, Chang, CY, Charlton, DG, Ciocca, C, Csilling, A, Cuffiani, M, Dado, S, Dallavalle, GM, de Roeck, A, de Wolf, EA, Desch, K, Dienes, B, Dubbert, J, Duchovni, E, Duckeck, G, Duerdoth, IP, Etzion, E, Fabbri, F, Ferrari, P, Fiedler, F, Fleck, I, Ford, M, Frey, A, Gagnon, P, Gary, JW, Geich-Gimbel, C, Giacomelli, G, Giacomelli, P, Giacomelli, R, Giunta, M, Goldberg, J, Gross, E, Grunhaus, J, Gruwé, M, Günther, PO, Gupta, A, Hajdu, C, Hamann, M, Hanson, GG, Harel, A, Hauschild, M, Hawkes, CM, Hawkings, R, Hemingway, RJ, Herten, G, Heuer, RD, Hill, JC, Horváth, D, Igo-Kemenes, P, Ishii, K, Jeremie, H, Jovanovic, P, Junk, TR, Kanzaki, J, Karlen, D, Kawagoe, K, Kawamoto, T, Keeler, RK, Kellogg, RG, Kennedy, BW, Kluth, S, Kobayashi, T, Kobel, M, Komamiya, S, Krämer, T, Krieger, P, von Krogh, J, Kuhl, T, Kupper, M, Lafferty, GD, Landsman, H, Lanske, D, Lellouch, D, Letts, J, Levinson, L, Lillich, J, Lloyd, SL, Loebinger, FK, Lu, J, Ludwig, A, Ludwig, J, Mader, W, Marcellini, S, Martin, AJ, Mashimo, T, Mättig, P, McKenna, J, McPherson, RA, Meijers, F, Menges, W, Merritt, FS, Mes, H, Meyer, N, Michelini, A, Mihara, S, Mikenberg, G, Miller, DJ, Mohr, W, Mori, T, Mutter, A, Nagai, K, Nakamura, I, Nanjo, H, Neal, HA, Nisius, R, O'Neale, SW, Oh, A, Oreglia, MJ, Orito, S, Pahl, C, Pásztor, G, Pater, JR, Pilcher, JE, Pinfold, J, Plane, DE, Pooth, O, Przybycień, M, Quadt, A, Rabbertz, K, Rembser, C, Renkel, P, Roney, JM, Rossi, AM, Rozen, Y, Runge, K, Sachs, K, Saeki, T, Sarkisyan, EKG, Schaile, AD, Schaile, O, Scharff-Hansen, P, Schieck, J, Schörner-Sadenius, T, Schröder, M, Schumacher, M, Seuster, R, Shears, TG, Shen, BC, Sherwood, P, Skuja, A, Smith, AM, Sobie, R, Söldner-Rembold, S, Spano, F, Stahl, A, Strom, D, Ströhmer, R, Tarem, S, Tasevsky, M, Teuscher, R, Thomson, MA, Torrence, E, Toya, D, Tran, P, Trigger, I, Trócsányi, Z, Tsur, E, Turner-Watson, MF, Ueda, I, Ujvári, B, Vollmer, CF, Vannerem, P, Vértesi, R, Verzocchi, M, Voss, H, Vossebeld, J, Ward, CP, Ward, DR, Watkins, PM, Watson, AT, Watson, NK, Wells, PS, Wengler, T, Wermes, N, Wilson, GW, Wilson, JA, Wolf, G, Wyatt, TR, Yamashita, S, Zer-Zion, D & Zivkovic, L 2006, 'Measurement of the running of the QED coupling in small-angle Bhabha scattering at LEP', European Physical Journal C, vol. 45, no. 1, pp. 1-21. https://doi.org/10.1140/epjc/s2005-02389-3

@article{1b8ef1644895478aa0e45527f39d0cc8,

title = "Measurement of the running of the QED coupling in small-angle Bhabha scattering at LEP",

abstract = "Using the OPAL detector at LEP, the running of the effective QED coupling α(t) is measured for space-like momentum transfer from the angular distribution of small-angle Bhabha scattering. In an almost ideal QED framework, with very favourable experimental conditions, we obtain: Δα(-6.07 GeV2) - Δα(-1.81 GeV2) = (440 ± 58 ± 43 ± 30) × 10-5, where the first error is statistical, the second is the experimental systematic and the third is the theoretical uncertainty. This agrees with current evaluations of α(t). The null hypothesis that α remains constant within the above interval of -t is excluded with a significance above 5σ. Similarly, our results are inconsistent at the level of 3 σ with the hypothesis that only leptonic loops contribute to the running. This is currently the most significant direct measurement where the running α(t) is probed differentially within the measured t range.",

author = "G. Abbiendi and C. Ainsley and {\AA}kesson, {P. F.} and G. Alexander and G. Anagnostou and Anderson, {K. J.} and S. Asai and D. Axen and I. Bailey and E. Barberio and T. Barillari and Barlow, {R. J.} and Batley, {R. J.} and P. Bechtle and T. Behnke and Bell, {K. W.} and Bell, {P. J.} and G. Bella and A. Bellerive and G. Benelli and S. Bethke and O. Biebel and O. Boeriu and P. Bock and M. Boutemeur and S. Braibant and Brown, {R. M.} and Burckhart, {H. J.} and S. Campana and P. Capiluppi and Carnegie, {R. K.} and Carter, {A. A.} and Carter, {J. R.} and Chang, {C. Y.} and Charlton, {D. G.} and C. Ciocca and A. Csilling and M. Cuffiani and S. Dado and Dallavalle, {G. M.} and {de Roeck}, A. and {de Wolf}, {E. A.} and K. Desch and B. Dienes and J. Dubbert and E. Duchovni and G. Duckeck and Duerdoth, {I. P.} and E. Etzion and F. Fabbri and P. Ferrari and F. Fiedler and I. Fleck and M. Ford and A. Frey and P. Gagnon and Gary, {J. W.} and C. Geich-Gimbel and G. Giacomelli and P. Giacomelli and R. Giacomelli and M. Giunta and J. Goldberg and E. Gross and J. Grunhaus and M. Gruw{\'e} and G{\"u}nther, {P. O.} and A. Gupta and C. Hajdu and M. Hamann and Hanson, {G. G.} and A. Harel and M. Hauschild and Hawkes, {C. M.} and R. Hawkings and Hemingway, {R. J.} and G. Herten and Heuer, {R. D.} and Hill, {J. C.} and D. Horv{\'a}th and P. Igo-Kemenes and K. Ishii and H. Jeremie and P. Jovanovic and Junk, {T. R.} and J. Kanzaki and D. Karlen and K. Kawagoe and T. Kawamoto and Keeler, {R. K.} and Kellogg, {R. G.} and Kennedy, {B. W.} and S. Kluth and T. Kobayashi and M. Kobel and S. Komamiya and T. Kr{\"a}mer and P. Krieger and {von Krogh}, J. and T. Kuhl and M. Kupper and Lafferty, {G. D.} and H. Landsman and D. Lanske and D. Lellouch and J. Letts and L. Levinson and J. Lillich and Lloyd, {S. L.} and Loebinger, {F. K.} and J. Lu and A. Ludwig and J. Ludwig and W. Mader and S. Marcellini and Martin, {A. J.} and T. Mashimo and P. M{\"a}ttig and J. McKenna and McPherson, {R. A.} and F. Meijers and W. Menges and Merritt, {F. S.} and H. Mes and N. Meyer and A. Michelini and S. Mihara and G. Mikenberg and Miller, {D. J.} and W. Mohr and T. Mori and A. Mutter and K. Nagai and I. Nakamura and H. Nanjo and Neal, {H. A.} and R. Nisius and O'Neale, {S. W.} and A. Oh and Oreglia, {M. J.} and S. Orito and C. Pahl and G. P{\'a}sztor and Pater, {J. R.} and Pilcher, {J. E.} and J. Pinfold and Plane, {D. E.} and O. Pooth and M. Przybycie{\'n} and A. Quadt and K. Rabbertz and C. Rembser and P. Renkel and Roney, {J. M.} and Rossi, {A. M.} and Y. Rozen and K. Runge and K. Sachs and T. Saeki and Sarkisyan, {E. K.G.} and Schaile, {A. D.} and O. Schaile and P. Scharff-Hansen and J. Schieck and T. Sch{\"o}rner-Sadenius and M. Schr{\"o}der and M. Schumacher and R. Seuster and Shears, {T. G.} and Shen, {B. C.} and P. Sherwood and A. Skuja and Smith, {A. M.} and R. Sobie and S. S{\"o}ldner-Rembold and F. Spano and A. Stahl and D. Strom and R. Str{\"o}hmer and S. Tarem and M. Tasevsky and R. Teuscher and Thomson, {M. A.} and E. Torrence and D. Toya and P. Tran and I. Trigger and Z. Tr{\'o}cs{\'a}nyi and E. Tsur and Turner-Watson, {M. F.} and I. Ueda and B. Ujv{\'a}ri and Vollmer, {C. F.} and P. Vannerem and R. V{\'e}rtesi and M. Verzocchi and H. Voss and J. Vossebeld 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 T. Wengler and N. Wermes and Wilson, {G. W.} and Wilson, {J. A.} and G. Wolf and Wyatt, {T. R.} and S. Yamashita and D. Zer-Zion and L. Zivkovic",

year = "2006",

month = jan,

doi = "10.1140/epjc/s2005-02389-3",

language = "English",

volume = "45",

pages = "1--21",

journal = "European Physical Journal C",

issn = "1434-6044",

publisher = "Springer New York",

number = "1",

}

TY - JOUR

T1 - Measurement of the running of the QED coupling in small-angle Bhabha scattering at LEP

AU - Abbiendi, G.

AU - Ainsley, C.

AU - Åkesson, P. F.

AU - Alexander, G.

AU - Anagnostou, G.

AU - Anderson, K. J.

AU - Asai, S.

AU - Axen, D.

AU - Bailey, I.

AU - Barberio, E.

AU - Barillari, T.

AU - Barlow, R. J.

AU - Batley, R. J.

AU - Bechtle, P.

AU - Behnke, T.

AU - Bell, K. W.

AU - Bell, P. J.

AU - Bella, G.

AU - Bellerive, A.

AU - Benelli, G.

AU - Bethke, S.

AU - Biebel, O.

AU - Boeriu, O.

AU - Bock, P.

AU - Boutemeur, M.

AU - Braibant, S.

AU - Brown, R. M.

AU - Burckhart, H. J.

AU - Campana, S.

AU - Capiluppi, P.

AU - Carnegie, R. K.

AU - Carter, A. A.

AU - Carter, J. R.

AU - Chang, C. Y.

AU - Charlton, D. G.

AU - Ciocca, C.

AU - Csilling, A.

AU - Cuffiani, M.

AU - Dado, S.

AU - Dallavalle, G. M.

AU - de Roeck, A.

AU - de Wolf, E. A.

AU - Desch, K.

AU - Dienes, B.

AU - Dubbert, J.

AU - Duchovni, E.

AU - Duckeck, G.

AU - Duerdoth, I. P.

AU - Etzion, E.

AU - Fabbri, F.

AU - Ferrari, P.

AU - Fiedler, F.

AU - Fleck, I.

AU - Ford, M.

AU - Frey, A.

AU - Gagnon, P.

AU - Gary, J. W.

AU - Geich-Gimbel, C.

AU - Giacomelli, G.

AU - Giacomelli, P.

AU - Giacomelli, R.

AU - Giunta, M.

AU - Goldberg, J.

AU - Gross, E.

AU - Grunhaus, J.

AU - Gruwé, M.

AU - Günther, P. O.

AU - Gupta, A.

AU - Hajdu, C.

AU - Hamann, M.

AU - Hanson, G. G.

AU - Harel, A.

AU - Hauschild, M.

AU - Hawkes, C. M.

AU - Hawkings, R.

AU - Hemingway, R. J.

AU - Herten, G.

AU - Heuer, R. D.

AU - Hill, J. C.

AU - Horváth, D.

AU - Igo-Kemenes, P.

AU - Ishii, K.

AU - Jeremie, H.

AU - Jovanovic, P.

AU - Junk, T. R.

AU - Kanzaki, J.

AU - Karlen, D.

AU - Kawagoe, K.

AU - Kawamoto, T.

AU - Keeler, R. K.

AU - Kellogg, R. G.

AU - Kennedy, B. W.

AU - Kluth, S.

AU - Kobayashi, T.

AU - Kobel, M.

AU - Komamiya, S.

AU - Krämer, T.

AU - Krieger, P.

AU - von Krogh, J.

AU - Kuhl, T.

AU - Kupper, M.

AU - Lafferty, G. D.

AU - Landsman, H.

AU - Lanske, D.

AU - Lellouch, D.

AU - Letts, J.

AU - Levinson, L.

AU - Lillich, J.

AU - Lloyd, S. L.

AU - Loebinger, F. K.

AU - Lu, J.

AU - Ludwig, A.

AU - Ludwig, J.

AU - Mader, W.

AU - Marcellini, S.

AU - Martin, A. J.

AU - Mashimo, T.

AU - Mättig, P.

AU - McKenna, J.

AU - McPherson, R. A.

AU - Meijers, F.

AU - Menges, W.

AU - Merritt, F. S.

AU - Mes, H.

AU - Meyer, N.

AU - Michelini, A.

AU - Mihara, S.

AU - Mikenberg, G.

AU - Miller, D. J.

AU - Mohr, W.

AU - Mori, T.

AU - Mutter, A.

AU - Nagai, K.

AU - Nakamura, I.

AU - Nanjo, H.

AU - Neal, H. A.

AU - Nisius, R.

AU - O'Neale, S. W.

AU - Oh, A.

AU - Oreglia, M. J.

AU - Orito, S.

AU - Pahl, C.

AU - Pásztor, G.

AU - Pater, J. R.

AU - Pilcher, J. E.

AU - Pinfold, J.

AU - Plane, D. E.

AU - Pooth, O.

AU - Przybycień, M.

AU - Quadt, A.

AU - Rabbertz, K.

AU - Rembser, C.

AU - Renkel, P.

AU - Roney, J. M.

AU - Rossi, A. M.

AU - Rozen, Y.

AU - Runge, K.

AU - Sachs, K.

AU - Saeki, T.

AU - Sarkisyan, E. K.G.

AU - Schaile, A. D.

AU - Schaile, O.

AU - Scharff-Hansen, P.

AU - Schieck, J.

AU - Schörner-Sadenius, T.

AU - Schröder, M.

AU - Schumacher, M.

AU - Seuster, R.

AU - Shears, T. G.

AU - Shen, B. C.

AU - Sherwood, P.

AU - Skuja, A.

AU - Smith, A. M.

AU - Sobie, R.

AU - Söldner-Rembold, S.

AU - Spano, F.

AU - Stahl, A.

AU - Strom, D.

AU - Ströhmer, R.

AU - Tarem, S.

AU - Tasevsky, M.

AU - Teuscher, R.

AU - Thomson, M. A.

AU - Torrence, E.

AU - Toya, D.

AU - Tran, P.

AU - Trigger, I.

AU - Trócsányi, Z.

AU - Tsur, E.

AU - Turner-Watson, M. F.

AU - Ueda, I.

AU - Ujvári, B.

AU - Vollmer, C. F.

AU - Vannerem, P.

AU - Vértesi, R.

AU - Verzocchi, M.

AU - Voss, H.

AU - Vossebeld, J.

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 - Wengler, T.

AU - Wermes, N.

AU - Wilson, G. W.

AU - Wilson, J. A.

AU - Wolf, G.

AU - Wyatt, T. R.

AU - Yamashita, S.

AU - Zer-Zion, D.

AU - Zivkovic, L.

PY - 2006/1

Y1 - 2006/1

N2 - Using the OPAL detector at LEP, the running of the effective QED coupling α(t) is measured for space-like momentum transfer from the angular distribution of small-angle Bhabha scattering. In an almost ideal QED framework, with very favourable experimental conditions, we obtain: Δα(-6.07 GeV2) - Δα(-1.81 GeV2) = (440 ± 58 ± 43 ± 30) × 10-5, where the first error is statistical, the second is the experimental systematic and the third is the theoretical uncertainty. This agrees with current evaluations of α(t). The null hypothesis that α remains constant within the above interval of -t is excluded with a significance above 5σ. Similarly, our results are inconsistent at the level of 3 σ with the hypothesis that only leptonic loops contribute to the running. This is currently the most significant direct measurement where the running α(t) is probed differentially within the measured t range.

AB - Using the OPAL detector at LEP, the running of the effective QED coupling α(t) is measured for space-like momentum transfer from the angular distribution of small-angle Bhabha scattering. In an almost ideal QED framework, with very favourable experimental conditions, we obtain: Δα(-6.07 GeV2) - Δα(-1.81 GeV2) = (440 ± 58 ± 43 ± 30) × 10-5, where the first error is statistical, the second is the experimental systematic and the third is the theoretical uncertainty. This agrees with current evaluations of α(t). The null hypothesis that α remains constant within the above interval of -t is excluded with a significance above 5σ. Similarly, our results are inconsistent at the level of 3 σ with the hypothesis that only leptonic loops contribute to the running. This is currently the most significant direct measurement where the running α(t) is probed differentially within the measured t range.

UR - http://www.scopus.com/inward/record.url?scp=28744455677&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=28744455677&partnerID=8YFLogxK

U2 - 10.1140/epjc/s2005-02389-3

DO - 10.1140/epjc/s2005-02389-3

M3 - Article

AN - SCOPUS:28744455677

SN - 1434-6044

VL - 45

SP - 1

EP - 21

JO - European Physical Journal C

JF - European Physical Journal C

IS - 1

ER -

Measurement of the running of the QED coupling in small-angle Bhabha scattering at LEP

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