Measurement of the Michel parameters in leptonic tau decays

被引：31

作者：

Ackerstaff, K ^{[1
]}

Alexander, G

Allison, J

Altekamp, N

Anderson, KJ

Anderson, S

Arcelli, S

Asai, S

Ashby, SF

Axen, D

Azuelos, G

Ball, AH

Barberio, E

Barlow, RJ

Bartoldus, R

Batley, JR

Baumann, S

Bechtluft, J

Behnke, T

Bell, KW

Bella, G

Bentvelsen, S

Bethke, S

Betts, S

Biebel, O

Biguzzi, A

Bird, SD

Blobel, V

Bloodworth, IJ

Bobinski, M

Bock, P

Böhme, J

Boutemeur, M

Braibant, S

Bright-Thomas, P

Brown, RM

Burckhart, HJ

Burgard, C

Bürgin, R

Capiluppi, P

Carnegie, RK

Carter, AA

Carter, JR

Chang, CY

Charlton, DG

Chrisman, D

Ciocca, C

Clarke, PEL

Clay, E

Cohen, I

机构：

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

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

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

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

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

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

[7] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

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

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

[10] Univ Chicago, Enrico 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] Univ Heidelberg, Inst Phys, D-69120 Heidelberg, Germany

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

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

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

[17] Univ London Univ Coll, 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, Phys Nucl Lab, Montreal, PQ H3C 3J7, Canada

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

[22] Rutherford Appleton Lab, 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 113, Japan

[26] Univ Tokyo, Dept Phys, Tokyo 113, Japan

[27] Kobe Univ, Kobe, Hyogo 657, Japan

[28] Brunel Univ, Inst Phys & Environm Sci, Uxbridge UB8 3PH, Middx, England

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

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

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

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

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

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

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

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

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

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

[39] Nucl Res Inst, Debrecen, Hungary

[40] Lajos Kossuth Univ, Dept Expt Phys, Debrecen, Hungary

来源：

EUROPEAN PHYSICAL JOURNAL C | 1999年 / 8卷 / 01期

关键词：

D O I：

10.1007/s100520050441

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：

The Michel parameters of the leptonic tau decays are measured using the OPAL detector at LEP. The parameters pe, Ee, (E delta)e (with l = e, mu) and eta(mu), are extracted from the energy spectra of the charged decay leptons and from their energy-energy correlations. A new method involving a global likelihood fit of Monte Carlo generated events with complete detector simulation and background treatment has been applied to the data recorded at center-of-mass energies close to root s = m(Z)o corresponding to an integrated luminosity of 155 pb(-1). If e-mu universality is assumed and inferring the tau polarization from neutral current data, the measured Michel parameters are: rho = 0.781 +/- 0.028 +/- 0.018, xi = 0.98 +/- 0.22 +/- 0.10, eta = 0.027 +/- 0.055 +/- 0.005, xi delta = 0.65 +/- 0.14 +/- 0.07. where the value of eta has been constrained using the published OPAL measurements of the leptonic branching ratios and the tau lifetime; Limits on non-standard coupling constants and on the masses of new gauge bosons are obtained. The results are in agreement with the V-A prediction of the Standard Model.

引用

页码：3 / 21

页数：19

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