Study of high-multiplicity 3-prong and 5-prong tau decays at BABAR

We present measurements of the branching fractions of 3-prong and 5-prong tau decay modes using a sample of 430 million tau lepton pairs, corresponding to an integrated luminosity of 468 fb-1, collected with the BaBar detector at the PEP-II asymmetric energy e+e- storage rings. The \tau- --> (3\pi)- \eta \nu, \tau- --> (3\pi)- \omega \nu, and \tau- --> \pi- f_1(1285)\nu, branching fractions are presented as well as a new limit on the branching fraction of the isospin-forbidden, second-class current, \tau- --> \pi-\eta'(958)\nu, decay. We find no evidence for charged kaons in these decay modes and place the first upper limits on their branching fractions.

13.35.Dx
14.60.Fg
tau: decay modes
tau: semileptonic decay
tau: branching ratio: measured
tau: branching ratio: upper limit
second-class current
eta(958): intermediate state
BaBar
electron positron: annihilation

References(28)

Figures(30)

[1]

Tau and muon pair production cross-sections in electron-positron annihilations at s**(1/2) = 10.58-GeV

- Phys.Rev.D 77 (2008) 054012
•
e-Print:
- 0706.3235
•
DOI:
- 10.1103/PhysRevD.77.054012

[2]

The BaBar detector

BaBar

Collaboration

•

Bernard Aubert
(
- Annecy, LAPP
)

et al.

- Nucl.Instrum.Meth.A 479 (2002) 1-116
•
e-Print:
- hep-ex/0105044
•
DOI:
- 10.1016/S0168-9002(01)02012-5

[3]

Observation of CP violation in $B^0 \to K^{+} \pi^{-}$ and $B^0 \to \pi^{+} \pi^{-}$

BaBar

Collaboration

•

Bernard Aubert
(
- Annecy, LAPP
)

et al.

- Phys.Rev.Lett. 99 (2007) 021603
•
e-Print:
- hep-ex/0703016
•
DOI:
- 10.1103/PhysRevLett.99.021603

[4]

The Precision Monte Carlo event generator K K for two fermion final states in e+ e- collisions

S. Jadach
(
- DESY and
- Cracow, INP and
- CERN
)
,
B.F.L. Ward
(
- Tennessee U. and
- CERN and
- SLAC
)
,
Z. Was
(
- Cracow, INP and
- CERN
)

- Comput.Phys.Commun. 130 (2000) 260-325
•
e-Print:
- hep-ph/9912214
•
DOI:
- 10.1016/S0010-4655(00)00048-5

[5]

The tau decay library TAUOLA: Version 2.4

S. Jadach
(
- CERN and
- Cracow, INP
)
,
Z. Was
(
- CERN and
- Cracow, INP
)
,
R. Decker
(
- Karlsruhe U.
)
,
Johann H. Kuhn
(
- Karlsruhe U.
)

- Comput.Phys.Commun. 76 (1993) 361-380
•
DOI:
- 10.1016/0010-4655(93)90061-G

[6]

High-energy physics event generation with PYTHIA 5.7 and JETSET 7.4

Torbjorn Sjostrand
(
- CERN
)

- Comput.Phys.Commun. 82 (1994) 74-90,
- CERN Geneva - TH. 7111 (93/12,rec.Jan.94) 17 p. and e: CERN th-7111-93
•
DOI:
- 10.1016/0010-4655(94)90132-5

[7]

PHOTOS: A Universal Monte Carlo for QED radiative corrections. Version 2.0

Elisabetta Barberio
(
- CERN and
- Siegen U.
)
,
Zbigniew Was
(
- CERN and
- Cracow, INP
)

- Comput.Phys.Commun. 79 (1994) 291-308
•
DOI:
- 10.1016/0010-4655(94)90074-4

[8]

The EvtGen particle decay simulation package

D.J. Lange
(
- LLNL, Livermore
)

- Nucl.Instrum.Meth.A 462 (2001) 152-155
•
DOI:
- 10.1016/S0168-9002(01)00089-4

[9]

GEANT4 Collaboration

Collaboration

•

S. Agostinelli

for the collaboration.

- Nucl.Instrum.Meth.A 599 (2003) 250

[10]

The Principal axis of jets. An Attempt to analyze high-energy collisions as two-body processes

- Phys.Lett. 12 (1964) 57-61
•
DOI:
- 10.1016/0031-9163(64)91176-X

[10]

A QCD Test for Jets

Edward Farhi
(
- Harvard U.
)

- Phys.Rev.Lett. 39 (1977) 1587-1588
•
DOI:
- 10.1103/PhysRevLett.39.1587

[11]

Review of Particle Physics (RPP)

J. Beringer
(
- LBL, Berkeley
)
,
J.F. Arguin
(
- LBL, Berkeley and
- Montreal U.
)
,
R.M. Barnett
(
- LBL, Berkeley
)
,
K. Copic
(
- LBL, Berkeley
)
,
O. Dahl
(
- LBL, Berkeley
)

et al.

- Phys.Rev.D 86 (2012) 010001
•
DOI:
- 10.1103/PhysRevD.86.010001

[12]

The Novosibirsk function is defined as f(m) = A exp(-0.5 ln2 [1 + Λτ · (m - m0)] /τ2 + τ2 ), where Λ = sinh(τ √ ln4)/(στ √ ln4), the peak position is m0, the width is σ and τ is the tail parameter

[13]