Measurement of αs with radiative hadronic events

被引：13

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, 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, Dipartmento 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] Univ Cambridge, Cavendish 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 Queen Mary & Westfield Coll, London E1 4NS, England

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

[15] UCL, London WC1E 6BT, England

[16] Univ Manchester, Schuster Lab, Sch Phys & Astron, 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, 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, D-80805 Munich, Germany

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

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

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

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

[39] MPI Munchen, Munich, Germany

[40] High Energy Accelerator Res Org, Tsukuba, Ibaraki, Japan

来源：

EUROPEAN PHYSICAL JOURNAL C | 2008年 / 53卷 / 01期

关键词：

D O I：

10.1140/epjc/s10052-007-0470-9

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：

Hadronic final states with a hard isolated photon are studied using data taken at centre-of-mass energies around the mass of the Z boson with the OPAL detector at LEP. The strong coupling alpha(s) is extracted by comparing data and QCD predictions for event shape observables at average reduced centre-of-mass energies ranging from 24 GeV to 78 GeV, and the energy dependence of alpha(s) is studied. Our results are consistent with the running of alpha(s) as predicted by QCD and show that within the uncertainties of our analysis event shapes in hadronic Z decays with hard and isolated photon radiation can be described by QCD at reduced centre-of-mass energies. Combining all values from different event shape observables and energies gives alpha(s)(M(Z))=0.1182 +/- 0.0015(stat.)+/- 0.0101(syst.).

引用

页码：21 / 39

页数：19

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