Measurement of the tau topological branching ratios at LEP

Acton, P.D.; Alexander, G.; Allison, J.; Allport, P.P.; Anderson, K.J.; Arcelli, S.; Astbury, A.; Axen, D.; Azuelos, G.; Bahan, G.A.

doi:10.1016/0370-2693(92)91117-R

Measurement of the tau topological branching ratios at LEP

OPAL

Collaboration

Apr, 1992

13 pages

Published in:

Phys.Lett.B 288 (1992) 373-385

Published: 1992

DOI:

10.1016/0370-2693(92)91117-R

PDG:

{{\mathit \tau}^{-}}

\rightarrow

{{\mathit \mu}^{-}}{{\overline{\mathit \nu}}_{{{\mu}}}}{{\mathit \nu}_{{{\tau}}}}

Report number:

CERN-PPE-92-066,
CERN-PPE-92-66

Experiments:

CERN-LEP-OPAL

View in:

CERN Document Server

reference search29 citations

Citations per year

Abstract: (Elsevier)

The inclusive branching ratios of the τ lepton to one, three and five charged particle final states are measured from data collected with the OPAL detector at LEP. The data sample consists of 12707e + e − → τ + τ − candidate events and has an estimated background of 1.9%. The branching ratios are obtained from a simultaneous fit to the data which gives B 1 = 84.48 ± 0.27 (stat) ±0.23 (sys)%, B 3 = 15.26±0.26±0.22% and B 5 = 0.26±0.06±0.05% respectively where B 1 + B 3 + B 5 is constrained to equal one. The inclusive one-prong branching ratio is found to be significantly lower than the 1990 Particle Data Group world average while the branching ratio to three charged particles is correspondingly higher. The five-prong branching ratio is in agreement with the world average measurement.

electron positron: colliding beams
colliding beams: electron positron
electron positron: annihilation
annihilation: electron positron
tau: electroproduction
electroproduction: tau
tau: pair production
pair production: tau
tau: decay modes
decay modes: tau

References(25)

Figures(0)

[1]

Review of particle properties

J.J. Hernández

- Phys.Lett.B 239 (1990) VI.14

[2]

The Physics of the tau Lepton

B.C. Barish
(
- Caltech
)
,
R. Stroynowski
(
- Caltech
)

- Phys.Rept. 157 (1988) 1
•
DOI:
- 10.1016/0370-1573(88)90103-2

[3]

Hadronic $\tau$ Decay, Pion Radiative Decay and Pion Polarizability

Tran N. Truong
(
- Ecole Polytechnique and
- SLAC
)

- Phys.Rev.D 30 (1984) 1509
•
DOI:
- 10.1103/PhysRevD.30.1509

[3]

Calculation of Exclusive Decay Modes of the tau

Frederick J. Gilman
(
- SLAC
)
,
Sun Hong Rhie
(
- SLAC
)

- Phys.Rev.D 31 (1985) 1066
•
DOI:
- 10.1103/PhysRevD.31.1066

[3]

A Statistical Study of Tau Decay Data

K.G. Hayes
(
- SLAC
)
,
Martin L. Perl
(
- SLAC
)

- Phys.Rev.D 38 (1988) 3351
•
DOI:
- 10.1103/PhysRevD.38.3351

[4]

Measurement of tau branching ratios

ALEPH

Collaboration

•

D. Decamp
(
- Annecy, LAPP
)

et al.

- Z.Phys.C 54 (1992) 211-228
•
DOI:
- 10.1007/BF01566649

[4]

Decay properties of tau leptons measured at the Z0 resonance

L3

Collaboration

•

B. Adeva
(
- CERN
)

et al.

- Phys.Lett.B 265 (1991) 451-461
•
DOI:
- 10.1016/0370-2693(91)90081-Z

[5]

Measurement of exclusive one prong and inclusive three prong branching ratios of the tau lepton

ARGUS

Collaboration

•

H. Albrecht
(
- DESY
)

et al.

- Z.Phys.C 53 (1992) 367-374
•
DOI:
- 10.1007/BF01625895

[6]

Vancouver

K. Riles

[7]

Production Cross-section and Topological Decay Branching Fractions of the $\tau$ Lepton

HRS

Collaboration

•

S. Abachi
(
- Argonne
)

et al.

- Phys.Rev.D 40 (1989) 902
•
DOI:
- 10.1103/PhysRevD.40.902

[8]

$\tau$ Production and Decay With the Cello Detector at {PETRA}

CELLO

Collaboration

•

H.J. Behrend
(
- DESY
)

et al.

- Phys.Lett.B 222 (1989) 163-172
•
DOI:
- 10.1016/0370-2693(89)90741-7

[8]

Exclusive $\tau$ Decays With the Cello Detector at {PETRA}

CELLO

Collaboration

•

H.J. Behrend
(
- DESY
)

et al.

- Z.Phys.C 46 (1990) 537-546
•
DOI:
- 10.1007/BF01560254

[9]

The OPAL detector at LEP

OPAL

Collaboration

•

K. Ahmet

et al.

- Nucl.Instrum.Meth.A 305 (1991) 275-319
•
DOI:
- 10.1016/0168-9002(91)90547-4

[10]

An Application of the Geant3 Geometry Package to the Description of the Opal Detector

J. Allison
(
- Manchester U.
)
,
R. Brun
(
- CERN
)
,
F. Bruyant
(
- CERN
)
,
F.W. Bullock
(
- University Coll. London
)
,
C.Y. Chang
(
- Maryland U.
)

et al.

- Comput.Phys.Commun. 47 (1987) 55
•
DOI:
- 10.1016/0010-4655(87)90066-X

[10]

Proc. MC'91 Workshop

D.R. Ward

[10]

The Detector simulation program for the OPAL experiment at LEP

OPAL

Collaboration

•

J. Allison
(
- Manchester U.
)

et al.

- Nucl.Instrum.Meth.A 317 (1992) 47-74
•
DOI:
- 10.1016/0168-9002(92)90593-S

[11]

Measurement of the $Z^0$ line shape parameters and the electroweak couplings of charged leptons

OPAL

Collaboration

•

G. Alexander

et al.

- Z.Phys.C 52 (1991) 175-208

[12]

Measurement of branching ratios and tau polarization from tau ---> e neutrino anti-neutrino , tau ---> mu neutrino anti-neutrino, and tau ---> pi (K) neutrino decays at LEP

OPAL

Collaboration

•

G. Alexander
(
- Tel Aviv U.
)

et al.

- Phys.Lett.B 266 (1991) 201-217
•
DOI:
- 10.1016/0370-2693(91)90768-L

[13]

TAUOLA: A Library of Monte Carlo programs to simulate decays of polarized tau leptons

- Comput.Phys.Commun. 64 (1990) 275-299,
- Comput. Phys. Commun. 64 (1990) 275-299 and CERN Geneva - TH. 5856 (90,rec.Oct.) 37 p
•
DOI:
- 10.1016/0010-4655(91)90038-M

[13]

The Monte Carlo program KORALZ, version 3.8, for the lepton or quark pair production at LEP / SLC energies

Stanislaw Jadach
(
- CERN
)
,
B.F.L. Ward
(
- Tennessee U. and
- SLAC
)
,
Zbigniew Was
(
- Cracow, INP
)

- Comput.Phys.Commun. 66 (1991) 276-292,
- Comput. Phys. Commun. 66 (1991) 276-292 and CERN Geneva - TH. 5994 (91/02,rec.May) 24 p
•
DOI:
- 10.1016/0010-4655(91)90077-X

[14]

Radiative Corrections to Bhabha Scattering at High-Energies. 1. Virtual and Soft Photon Corrections

- Nucl.Phys.B 304 (1988) 687-711
•
DOI:
- 10.1016/0550-3213(88)90650-5

[14]

Radiative Corrections to Bhabha Scattering at High-Energies. 2. Hard Photon Corrections and Monte Carlo Treatment

- Nucl.Phys.B 304 (1988) 712-748
•
DOI:
- 10.1016/0550-3213(88)90651-7

[15]

The Lund Monte Carlo for Jet Fragmentation and e+ e- Physics: Jetset Version 6.2

Torbjorn Sjostrand
(
- Lund U., Dept. Theor. Phys.
)

- Comput.Phys.Commun. 39 (1986) 347-407
•
DOI:
- 10.1016/0010-4655(86)90096-2

[16]

Two Photon Production Processes at High-Energy. 1.

R. Bhattacharya
(
- SUNY, Stony Brook
)
,
J. Smith
(
- SUNY, Stony Brook
)
,
G. Grammer, Jr.
(
- Illinois U., Urbana
)

- Phys.Rev.D 15 (1977) 3267
•
DOI:
- 10.1103/PhysRevD.15.3267

[16]

Two Photon Production Processes at High-Energy. 2.

J. Smith
(
- SUNY, Stony Brook
)
,
J.A.M. Vermaseren
(
- SUNY, Stony Brook
)
,
G. Grammer, Jr.
(
- Illinois U., Urbana
)

- Phys.Rev.D 15 (1977) 3280
•
DOI:
- 10.1103/PhysRevD.15.3280