Measurement of the running of the electromagnetic coupling at large momentum-transfer at LEP

被引：10

作者：

Achard, P ^{[1
]}

Adriani, O

Aguilar-Benitez, M

Alcaraz, J

Alemanni, G

Allaby, J

Aloisio, A

Alviggi, MG

Anderhub, H

Andreev, VP

Anselmo, F

Arefiev, A

Azemoon, T

Aziz, T

Bagnaia, P

Bajo, A

Baksay, G

Baksay, L

Baldew, SV

Banerjee, S

Barczyk, A

Barillère, R

Bartilini, P

Basile, M

Batalova, N

Battiston, R

Bay, A

Becattini, F

Becker, U

Behner, F

Bellucci, L

Berbeco, R

Berdugo, J

Berges, P

Bertucci, B

Betev, BL

Biasini, M

Biglietti, M

Biland, A

Blaising, JJ

Blyth, SC

Bobbink, GJ

Böhm, A

Boldizsar, L

Borgia, B

Bottai, S

Bourilkov, D

Bourquin, M

Braccini, S

机构：

[1] World Lab, FBLJA Project, CH-1211 Geneva, Switzerland

[2] Rhein Westfal TH Aachen, Inst Phys 3, D-52056 Aachen, Germany

[3] NIKHEF H, Natl Inst High Energy Phys, NL-1009 DB Amsterdam, Netherlands

[4] Univ Amsterdam, NL-1009 DB Amsterdam, Netherlands

[5] Univ Michigan, Ann Arbor, MI 48109 USA

[6] Lab Annecy Le Vieux Phys Particules, LAPP, CNRS, IN2P3, F-74941 Annecy Le Vieux, France

[7] Univ Basel, Inst Phys, CH-4056 Basel, Switzerland

[8] Louisiana State Univ, Baton Rouge, LA 70803 USA

[9] Inst High Energy Phys, Beijing 100039, Peoples R China

[10] Univ Bologna, I-40126 Bologna, Italy

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

[12] Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India

[13] Northeastern Univ, Boston, MA 02115 USA

[14] Inst Atom Phys, R-76900 Bucharest, Romania

[15] Univ Bucharest, R-76900 Bucharest, Romania

[16] Hungarian Acad Sci, Cent Res Inst Phys, H-1525 Budapest, Hungary

[17] MIT, Cambridge, MA 02139 USA

[18] Panjab Univ, Chandigarh 160014, India

[19] Univ Debrecen, ATOMKI, H-4010 Debrecen, Hungary

[20] Univ Coll Dublin, Dept Expt Phys, Dublin 4, Ireland

[21] Ist Nazl Fis Nucl, Sez Firenze, I-50125 Florence, Italy

[22] Univ Florence, I-50125 Florence, Italy

[23] CERN, European Lab Particle Phys, CH-1211 Geneva, Switzerland

[24] World Lab, FBLJA Project, CH-1211 Geneva, Switzerland

[25] Univ Hamburg, D-22761 Hamburg, Germany

[26] Univ Sci & Technol China, Hefei 230029, Peoples R China

[27] Univ Lausanne, CH-1015 Lausanne, Switzerland

[28] Univ Lyon 1, CNRS, IN2P3, Inst Phys Nucl Lyon, F-69622 Villeurbanne, France

[29] CIEMAT, E-28040 Madrid, Spain

[30] Florida Inst Technol, Melbourne, FL 32901 USA

[31] Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy

[32] Inst Theoret & Expt Phys, Moscow, Russia

[33] Ist Nazl Fis Nucl, Sez Napoli, I-80125 Naples, Italy

[34] Univ Naples Federico II, I-80125 Naples, Italy

[35] Univ Cyprus, Dept Phys, Nicosa, Cyprus

[36] Radboud Univ Nijmegen, NL-6525 ED Nijmegen, Netherlands

[37] Natl Inst Nucl Phys & High Energy Phys, NL-6525 ED Nijmegen, Netherlands

[38] CALTECH, Pasadena, CA 91125 USA

[39] Ist Nazl Fis Nucl, Sez Perugia, I-06100 Perugia, Italy

[40] Univ Perugia, I-06100 Perugia, Italy

[41] Russian Acad Sci, Inst Nucl Phys, St Petersburg, Russia

[42] Carnegie Mellon Univ, Pittsburgh, PA 15213 USA

[43] Ist Nazl Fis Nucl, Sez Napoli, I-85100 Potenza, Italy

[44] Univ Potenza, I-85100 Potenza, Italy

[45] Princeton Univ, Princeton, NJ 08544 USA

[46] Univ Calif Riverside, Riverside, CA 92521 USA

[47] Ist Nazl Fis Nucl, Sez Roma, I-00185 Rome, Italy

[48] Univ Roma La Sapienza, I-00185 Rome, Italy

[49] Univ Salerno, I-84100 Salerno, Italy

[50] Ist Nazl Fis Nucl, I-84100 Salerno, Italy

来源：

PHYSICS LETTERS B | 2005年 / 623卷 / 1-2期

关键词：

D O I：

10.1016/j.physletb.2005.07.052

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The evolution of the electromagnetic coupling, alpha, in the momentum-transfer range 1800 GeV2 < -Q(2) < 21600 GeV2 is studied with about 40 000 Bhabha-scattering events collected with the L3 detector at LEP at centre-of-mass energies root s = 189-209 GeV. The running of a is parametrised as: alpha(Q(2)) = (1-C Delta alpha(Q2))/(alpha 0) where alpha(0) = alpha(Q(2) = 0) is the fine-structure constant and C = 1 corresponds to the evolution expected in QED. A fit to the differential cross section of the e(+)e(-) -> e(+)e(-) process for scattering angles in the range vertical bar cos theta vertical bar < 0.9 excludes the hypothesis of a constant value of alpha, C = 0, and validates the QED prediction with the result: C = 1.05 +/- 0.07 +/- 0.14, where the first uncertainty is statistical and the second systematic. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：26 / 36

页数：11

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