QCD studies in e+e- annihilation from 30 GeV to 189 GeV

被引：36

作者：

Acciarri, M ^{[1
]}

Achard, P

Adriani, O

Aguilar-Benitez, M

Alcaraz, J

Alemanni, G

Allaby, J

Aloisio, A

Alviggi, MG

Ambrosi, G

Anderhub, H

Andreev, VP

Angelescu, T

Anselmo, F

Arefiev, A

Azemoon, T

Aziz, T

Bagnaia, P

Bajo, A

Baksay, L

Balandras, A

Baldew, SV

Banerjee, S

Barczyk, A

Barillère, R

Barone, L

Bartalini, P

Basile, M

Battiston, R

Bay, A

Becattini, F

Becker, U

Behner, F

Bellucci, L

Berbeco, R

Berdugo, J

Berges, P

Bertucci, B

Betev, BL

Bhattacharya, S

Biasini, M

Biland, A

Blaising, JJ

Blyth, SC

Bobbink, GJ

Böhm, A

Boldizsar, L

Borgia, B

Bourilkov, D

机构：

[1] Rhein Westfal TH Aachen, Inst Phys 1, D-52056 Aachen, Germany

[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] CNRS, IN2P3, Lab Annecy Le Vieux Phys Particules, 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] Humboldt Univ, D-10099 Berlin, Germany

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

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

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

[14] Northeastern Univ, Boston, MA 02115 USA

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

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

[17] Hungarian Acad Sci, Cent Res Inst Phys, H-1525 Budapest 114, Hungary

[18] MIT, Cambridge, MA 02139 USA

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

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

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

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

[23] FBLJA Project, World Lab, CH-1211 Geneva 23, Switzerland

[24] Univ Geneva, CH-1211 Geneva 4, Switzerland

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

[26] Res Inst High Energy Phys, SEFT, SF-00014 Helsinki, Finland

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

[28] Ist Nazl Fis Nucl, Sez Lecce, I-73100 Lecce, Italy

[29] Univ Lecce, I-73100 Lecce, Italy

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

[31] CIEMAT, Ctr Invest Energet Medioambientales & Tecnol, E-28040 Madrid, Spain

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

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

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

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

[36] Univ Cyprus, Dept Nat Sci, Nicosia, Cyprus

[37] Catholic Univ Nijmegen, NL-6525 ED Nijmegen, Netherlands

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

[39] CALTECH, Pasadena, CA 91125 USA

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

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

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

[43] Princeton Univ, Princeton, NJ 08544 USA

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

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

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

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

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

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

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

来源：

PHYSICS LETTERS B | 2000年 / 489卷 / 1-2期

关键词：

D O I：

10.1016/S0370-2693(00)00891-1

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present results obtained from a study of the structure of hadronic events recorded by the L3 detector at various centre-of-mass energies. The distributions of event shape variables and the energy dependence of their mean values are measured from 30 GeV to 189 GeV and compared with various QCD models. The energy dependence of the moments of event shape variables is used to test a power law ansatz for the non-perturbative component, We obtain a universal value of the non-perturbative parameter alpha(0) = 0.537 +/- 0.073. From a comparison with resummed O(alpha(s)(2)) QCD calculations, we determine the strong coupling constant at each of the selected energies. The measurements demonstrate the running of alpha(s) as expected in QCD with a Value of alpha(s)(m(Z)) = 0.1215 +/- 0.0012 (exp) +/- 0.0061 (th). (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：65 / 80

页数：16

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