Precise determination of the Z resonance parameters at LEP:: "Zedometry"

被引：48

作者：

Abbiendi, G ^{[1
]}

Ainsley, C

Akesson, PF

Alexander, G

Allison, J

Anagnostou, G

Anderson, KJ

Arcelli, S

Asai, S

Ashby, SF

Axen, D

Azuelos, G

Bailey, I

Ball, AH

Barberio, E

Barlow, RJ

Behnke, T

Bell, KW

Bella, G

Bellerive, A

Benelli, G

Bentvelsen, S

Beeston, C

Bethke, S

Biebel, O

Bloodworth, IJ

Boeriu, O

Bock, P

Böhme, J

Bonacorsi, D

Boutemeur, M

Braibant, S

Bright-Thomas, P

Brigliadori, L

Brown, RM

Burckhart, HJ

Cammin, J

Capiluppi, P

Carnegie, RK

Caron, B

Carter, AA

Carter, JR

Chang, CY

Charlton, DG

Clarke, PEL

Clay, E

Cohen, I

Conboy, JE

Cooke, OC

Couchman, J

机构：

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

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

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

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

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

[6] Cavendish Lab, Cambridge CB3 0HE, England

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

[8] Carleton Univ, Ctr Res Particle Phys, Ottawa, ON K1S 5B6, Canada

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

[10] Univ Chicago, Eurico Fermi Inst, Chicago, IL 60637 USA

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

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

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

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

[15] Queen Mary Univ London, London E1 4NS, England

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

[17] UCL, London WC1E 6BT, England

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

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

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

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

[22] Rutherford Appleton Lab, CLRC, Didcot OX11 0QX, Oxon, England

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

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

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

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

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

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

[29] Univ Hamburg, DESY, Inst Expt Phys 2, D-22607 Hamburg, Germany

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

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

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

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

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

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

[36] Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany

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

[38] Duke Univ, Dept Phys, Durham, NC 27708 USA

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

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

[41] Stanislaw Staszic Univ Min & Met, PL-30059 Krakow, Poland

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

[43] MPI Munchen, Munich, Germany

[44] Res Inst Particle & Nucl Phys, Budapest, Hungary

[45] Univ Calif Riverside, High Energy Phys Grp, Riverside, CA 92521 USA

[46] CERN, Div EP, CH-1211 Geneva 23, Switzerland

[47] Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel

来源：

EUROPEAN PHYSICAL JOURNAL C | 2001年 / 19卷 / 04期

关键词：

D O I：

10.1007/s100520100627

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：

This final analysis of hadronic and leptonic cross-sections and of leptonic forward-backward asymmetries in e(+)e(-) collisions With the OPAL detector makes use of the full LEP 1 data sample comprising 161pb(-1) of integrated luminosity and 4.5 x 10(6) selected Z decays. An interpretation of the data in terms of contributions from pure Z exchange and from gamma /Z interference allows the parameters of the Z resonance to be determined in a model-independent way. Our results are in good agreement with lepton universality anti consistent with the vector and axial-vector couplings predicted in the Standard Model. A fit to the complete dataset yields the fundamental Z resonance parameters: m(z) = (91.1852 +/- 0.0030) GeV. Gamma (Z) = 12.4948 +/- 0.0041) GeV. sigma (0)(h) = (41.501 +/- 0.055) nb. R-l = 20.823 +/- 0.044, and A(FB)(0,l) = 0.0145 +/- 0.0017. Transforming these parameters gives a measurement of the ratio between the decay width into invisible particles and the width to a single species of charged lepton. Gamma (inv)/Gamma (ll) = 5.942 +/- 0.027. Attributing the entire invisible width to neutrino, decays and assuming the Standard Model couplings for neutrinos. this translates into a measurement of the effective number of light neutrino species. N-nu = 2.984 +/- 0.013. Interpreting the data within the context of the Standard Model allows the mass of the top quark, m(t) = (162(-16)(+29)) GeV, to be determined through its influence oil radiative corrections. Alternatively, utilising the direct external measurement of m(t) as an additional constraint leads to a measurement of the strong coupling constant and the mass of the Higgs boson: alpha (s)(m(Z)) = 0.127 +/- 0.005 and m(H) = (390(-280)(+750)) GeV.

引用

页码：587 / 651

页数：65

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