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

被引：33

作者：

Abbiendi, G. ^{[1
]}

Ainsley, C.

Akesson, 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.

Benelli, G.

Bethke, S.

Biebel, O.

Boeriu, O.

Bock, P.

Boutemeur, M.

Braibant, S.

Brown, R. M.

Burckhart, H. J.

Campana, S.

Capiluppi, P.

Carnegie, R. K.

Carter, A. A.

Carter, J. R.

Chang, C. Y.

Charlton, D. G.

Ciocca, C.

Csilling, A.

Cuffiani, M.

Dado, S.

Dallavalle, G. M.

De Roeck, A.

De Wolf, E. A.

Desch, K.

Dienes, B.

Dubbert, J.

Duchovni, E.

Duckeck, G.

Duerdoth, I. P.

Etzion, E.

Fabbri, F.

机构：

[1] Univ Bologna, Dipartimento Fis, I-40126 Bologna, Italy

[2] Ist Nazl Fis Nucl, I-40126 Bologna, Italy

[3] Univ Bonn, Inst Phys, D-53115 Bonn, Germany

[4] Univ Calif Riverside, Dept Phys, Riverside, CA 92521 USA

[5] Cavevdish Lab, Cambridge CB3 0HE, England

[6] Carleton Univ, Dept Phys, Ottawa Carleton Inst Phys, Ottawa, ON K1S 5B6, Canada

[7] CERN, European Org Nucl Res, CH-1211 Geneva 23, Switzerland

[8] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA

[9] Univ Chicago, Dept Phys, Chicago, IL 60637 USA

[10] Univ Freiburg, Fak Phys, D-79104 Freiburg, Germany

[11] Univ Heidelberg, Inst Phys, D-69120 Heidelberg, Germany

[12] Indiana Univ, Dept Phys, Bloomington, IN 47405 USA

[13] Univ London, Univ London Queen Mary & Westfield Coll, London E1 4NS, England

[14] Tech Hsch Aachen, Inst Phys 3, D-52056 Aachen, Germany

[15] UCL, London WC1E 6BT, England

[16] Univ Manchester, Dept Phys, Schuster Lab, Manchester M13 9PL, Lancs, England

[17] Univ Maryland, Dept Phys, College Pk, MD 20742 USA

[18] Univ Montreal, Phys Nucl Lab, Montreal, PQ H3C 3J7, Canada

[19] Univ Oregon, Dept Phys, Eugene, OR 97403 USA

[20] Rutherford Appleton Lab, CCLRC, Didcot OX11 0QX, Oxon, England

[21] Technion Israel Inst Technol, Dept Phys, IL-32000 Haifa, Israel

[22] Tel Aviv Univ, Dept Phys & Astron, IL-69978 Tel Aviv, Israel

[23] Univ Tokyo, Int Ctr Elementary Particle Phys, Tokyo 1130033, Japan

[24] Univ Tokyo, Dept Phys, Tokyo 1130033, Japan

[25] Kobe Univ, Kobe, Hyogo 6578501, Japan

[26] Weizmann Inst Sci, Particle Phys Dept, IL-76100 Rehovot, Israel

[27] Univ Hamburg, DESY, Inst Expt Phys, D-22607 Hamburg, Germany

[28] Univ Victoria, Dept Phys, Victoria, BC V8W 3P6, Canada

[29] Univ British Columbia, Dept Phys, Vancouver, BC V6T 1Z1, Canada

[30] Univ Alberta, Dept Phys, Edmonton, AB T6G 2J1, Canada

[31] Res Inst Particle & Nucl Phys, H-1525 Budapest, Hungary

[32] Inst Nucl Res, H-4001 Debrecen, Hungary

[33] Univ Munich, Sekt Phys, D-85748 Garching, Germany

[34] Max Planck Inst Phys & Astrophys, Munich, Germany

[35] Yale Univ, Dept Phys, New Haven, CT 06520 USA

[36] TRIUMF, Vancouver, BC V6T 2A3, Canada

[37] Univ Debrecen, Dept Expt Phys, Debrecen, Hungary

[38] Max Planck Inst, Munich, Germany

[39] KEK, High Energy Accelerator Res Org, Tsukuba, Ibaraki, Japan

[40] Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England

[41] Univ Antwerp, Phys Dept, Antwerp, Belgium

来源：

EUROPEAN PHYSICAL JOURNAL C | 2006年 / 45卷 / 01期

关键词：

D O I：

10.1140/epjc/s2005-02389-3

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

Using the OPAL detector at LEP, the running of the effective QED coupling alpha(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: Delta alpha(-6.07 GeV(2)) - Delta alpha(-1.81 GeV(2)) = (440 +/- 58 +/- 43 +/- 30) x 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 alpha(t). The null hypothesis that alpha remains constant within the above interval of -t is excluded with a significance above 5 sigma. Similarly, our results are inconsistent at the level of 3 sigma with the hypothesis that only leptonic loops contribute to the running. This is currently the most significant direct measurement where the running alpha(t) is probed differentially within the measured t range.

引用

页码：1 / 21

页数：21

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