Measurement of the cross section of W-boson pair production at LEP

The cross section of W-boson pair-production is measured with the L3 detector at LEP. In a data sample corresponding to a total luminosity of 629.4 pb−1 , collected at centre-of-mass energies ranging from 189 to 209 GeV, 9834 four-fermion events with W bosons decaying into hadrons or leptons are selected. The total cross section is measured with a precision of 1.4% and agrees with the Standard Model expectation. Assuming charged-lepton universality, the branching fraction for hadronic W-boson decays is measured to be: Br(W→hadrons)=67.50±0.42(stat.)±0.30(syst.)% , in agreement with the Standard Model. Differential cross sections as a function of the W− production angle are also measured for the semi-leptonic channels qqe ν and qqμν .

electron positron: colliding beams
electron positron: annihilation
W: pair production
W: hadronic decay
W: leptonic decay
final state: (4fermion)
lepton: universality
W: branching ratio
channel cross section: energy dependence
differential cross section: angular dependence

References(65)

Figures(20)

Partial Symmetries of Weak Interactions

S.L. Glashow
(
- Copenhagen U.
)

- Nucl.Phys. 22 (1961) 579-588,
- Also in *Lai, C. H. (Ed.): Gauge Theory Of Weak and Electromagnetic Interactions*, 171-180
•
DOI:
- 10.1016/0029-5582(61)90469-2

A Model of Leptons

Steven Weinberg
(
- MIT, LNS
)

- Phys.Rev.Lett. 19 (1967) 1264-1266,
- Also in *Lichtenberg, D. B. (ed.), Rosen, S. P. (ed.): Developments In The Quark Theory Of Hadrons, Vol. 1*, 157-159,
- In *Lai, C. H. (ed.): Gauge Theory Of Weak and Electromagnetic Interactions*, 185-187,
- In *Rosner, J. L. (ed.): New Particles*, 26-28
•
DOI:
- 10.1103/PhysRevLett.19.1264

Weak and Electromagnetic Interactions

Abdus Salam
(
- Imperial Coll., London and
- ICTP, Trieste
)

- Conf.Proc.C 680519 (1968) 367-377,
- Reprinted in *Lichtenberg, D. B. (ed.), Rosen, S. P. (ed.): Developments In The Quark Theory Of Hadrons, Vol. 1*, 160-170, and in *Lai, C. H. (ed.): Gauge Theory Of Weak and Electromagnetic Interactions*, 188-198,
- Also in *Rosner, J.L. (ed.): New particles* 29-39,
- Also in *Ali, A. (ed.) et al.: Selected papers of Abdus Salam* 244-254
•
DOI:
- 10.1142/9789812795915_0034

Semi-analytical approach to four-fermion production in $e^+ e^−$ annihilation

Dmitri Yu. Bardin
(
- CERN and
- Dubna, JINR
)
,
Mikhail S. Bilenky
(
- Dubna, JINR and
- DESY, Zeuthen
)
,
D. Lehner
(
- DESY, Zeuthen
)
,
A. Olchevski
(
- Dubna, JINR
)
,
T. Riemann
(
- DESY, Zeuthen
)

- Nucl.Phys.B Proc.Suppl. 37 (1994) 2, 148-157,
- In *Teupitz 1994, Proceedings, Physics at LEP200 and beyond* 148-157,
- Nucl. Phys. B, Proc. Suppl. 37B (1994) 148-157, and Hamburg DESY - DESY-94-093 (94/06,rec.Jun.) 16 p. CERN Geneva - TH.-7295 (94/06,rec.Jun.) 16 p
•
e-Print:
- hep-ph/9406340
•
DOI:
- 10.1016/0920-5632(94)90670-X

Four fermion production in $e^+ e^-$ annihilation

- Nucl.Phys.B Proc.Suppl. 37 (1994) 2, 163-168,
- In *Teupitz 1994, Proceedings, Physics at LEP200 and beyond* 163-168,
- Nucl. Phys. B, Proc. Suppl. 37B (1994) 163-168, and Leiden U. - INLO-PUB-94-07 (94,rec.Jun.) 6 p
•
e-Print:
- hep-ph/9406232
•
DOI:
- 10.1016/0920-5632(94)90672-6