Measurement of the branching fraction of $B^+ \to \tau^+ \nu_\tau$ decays with the semileptonic tagging method and the full Belle data sample

Abdesselam, A.; Adachi, I.; Adamczyk, K.; Aihara, H.; Said, S.Al; Arinstein, K.; Arita, Y.; Asner, D.M.; Aso, T.; Aulchenko, V.

Measurement of the branching fraction of $B^+ \to \tau^+ \nu_\tau$ decays with the semileptonic tagging method and the full Belle data sample

Belle

Collaboration

Sep 18, 2014

7 pages

Contribution to:

- CKM 2014

e-Print:

1409.5269 [hep-ex]

Report number:

BELLE-CONF-1401

Experiments:

KEK-BF-BELLE

View in:

ADS Abstract Service

pdf

reference search12 citations

Citations per year

Abstract: (arXiv)

We report a measurement of the branching fraction of

B^+ \to \tau^+ \nu_\tau

decays using a data sample of

772 \times 10^6 B \bar{B}

pairs, collected at the

\Upsilon(4S)

resonance with the Belle detector at the KEKB asymmetric-energy

e^+e^-

collider. We reconstruct the accompanying

B

meson in a semileptonic decay and detect the

B^+ \to \tau^+ \nu_\tau

candidate in the recoiling event. We obtain a branching fraction of

{\cal B}(B^+ \to \tau^+ \nu_\tau) = [1.25 \pm 0.28 ({\rm stat.}) \pm 0.27({\rm syst.})] \times 10^{-4}

. This result is in good agreement with previous measurements and the expectation from calculations based on the Standard Model.

Note:

Belle conference paper for the International Workshop on the CKM Unitarity Triangle (CKM 2014)

B+: branching ratio: measured
BELLE
B-: semileptonic decay
KEK-B
electron positron: annihilation
B: pair production
B+: leptonic decay
experimental results
B+ --> tau+ neutrino/tau
10.58 GeV-cms

References(21)

Figures(8)

[1]

Throughout this paper, the inclusion of the chargeconjugate decay mode is implied unless otherwise stated

[2]

CP violation and the CKM matrix: Assessing the impact of the asymmetric $B$ factories

J. Charles
(
- Marseille, CPT and
- Sud Toulon Var U.
)
,
Andreas Hocker
(
- Orsay, LAL
)
,
H. Lacker
(
- Dresden, Tech. U.
)
,
S. Laplace
(
- Annecy, LAPP
)
,
F.R. Le Diberder
(
- Orsay, LAL
)

et al.

- Eur.Phys.J.C 41 (2005) 1, 1-131
•
e-Print:
- hep-ph/0406184
•
DOI:
- 10.1140/epjc/s2005-02169-1

[3]

A Search for $B^+ \to \ell^+ \nu_{\ell}$ Recoiling Against $B^{-}\to D^{0} \ell^{-}\bar{\nu} X$

BaBar

Collaboration

•

Bernard Aubert
(
- Annecy, LAPP
)

et al.

- Phys.Rev.D 81 (2010) 051101
•
e-Print:
- 0912.2453
•
DOI:
- 10.1103/PhysRevD.81.051101

[4]

Evidence of $B^+ \to \tau^+\nu$ decays with hadronic B tags

BaBar

Collaboration

•

J.P. Lees
(
- Annecy, LAPP
)

et al.

- Phys.Rev.D 88 (2013) 3, 031102
•
e-Print:
- 1207.0698
•
DOI:
- 10.1103/PhysRevD.88.031102

[5]

Evidence for $B^- -> \tau^- \bar{\nu}$ with a Semileptonic Tagging Method

Belle

Collaboration

•

K. Hara
(
- Nagoya U.
)

et al.

- Phys.Rev.D 82 (2010) 071101
•
e-Print:
- 1006.4201
•
DOI:
- 10.1103/PhysRevD.82.071101

[6]

Evidence for $B^- \to \tau^- \bar{\nu}_\tau$ with a Hadronic Tagging Method Using the Full Data Sample of Belle

Belle

Collaboration

•

I. Adachi
(
- KEK, Tsukuba
)

et al.

- Phys.Rev.Lett. 110 (2013) 13, 131801
•
e-Print:
- 1208.4678
•
DOI:
- 10.1103/PhysRevLett.110.131801

[7]

Review of Particle Physics

et al.

- Chin.Phys.C 38 (2014) 090001
•
DOI:
- 10.1088/1674-1137/38/9/090001

[8]

Overview of the KEKB accelerators

S. Kurokawa
(
- KEK, Tsukuba
)
,
Eiji Kikutani
(
- KEK, Tsukuba
)

- Nucl.Instrum.Meth.A 499 (2003) 1-7
•
DOI:
- 10.1016/S0168-9002(02)01771-0

[8]

Achievements of KEKB

et al.

- PTEP 2013 (2013) 03A001
•
DOI:
- 10.1093/ptep/pts102

Accelerator design at SuperKEKB

et al.

- PTEP 2013 (2013) 03A011
•
DOI:
- 10.1093/ptep/pts083

[9]

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

[10]

GEANT, CERN Report No. DD/EE/84-1

R. Brun

[11]

The Belle Detector

Belle

Collaboration

•

A. Abashian

et al.

- Nucl.Instrum.Meth.A 479 (2002) 117-232
•
DOI:
- 10.1016/S0168-9002(01)02013-7

[11]

Physics Achievements from the Belle Experiment

Belle

Collaboration

•

Jolanta Brodzicka
(
- Cracow, INP
)

et al.

- PTEP 2012 (2012) 04D001
•
e-Print:
- 1212.5342
•
DOI:
- 10.1093/ptep/pts072

[12]

Status of the Belle silicon vertex detector

et al.

- Nucl.Instrum.Meth.A 560 (2006) 1-4
•
DOI:
- 10.1016/j.nima.2005.11.228

[12]

Belle silicon vertex detectors

Y. Ushiroda
(
- KEK, Tsukuba
)

- Nucl.Instrum.Meth.A 511 (2003) 6-10
•
DOI:
- 10.1016/S0168-9002(03)01739-X

[13]

The NeuroBayes neural network package

M. Feindt
(
- Karlsruhe U., EKP
)
,
U. Kerzel
(
- Karlsruhe U., EKP
)

- Nucl.Instrum.Meth.A 559 (2006) 190-194
•
DOI:
- 10.1016/j.nima.2005.11.166

[14]

A Hierarchical NeuroBayes-based Algorithm for Full Reconstruction of B Mesons at B Factories

Michael Feindt
(
- KIT, Karlsruhe, EKP
)
,
Fabian Keller
(
- KIT, Karlsruhe, EKP
)
,
Michal Kreps
(
- KIT, Karlsruhe, EKP
)
,
Thomas Kuhr
(
- KIT, Karlsruhe, EKP
)
,
Sebastian Neubauer
(
- KIT, Karlsruhe, EKP
)

et al.

- Nucl.Instrum.Meth.A 654 (2011) 432-440
•
e-Print:
- 1102.3876
•
DOI:
- 10.1016/j.nima.2011.06.008

[15]

Evidence for $B^0 \to \pi^0 \pi^0$

Belle

Collaboration

•

S.H. Lee
(
- DMRC, Seoul
)

et al.

- Phys.Rev.Lett. 91 (2003) 261801
•
e-Print:
- hep-ex/0308040
•
DOI:
- 10.1103/PhysRevLett.91.261801

[16]

Search for exclusive charmless hadronic B decays

CLEO

Collaboration

•

D.M. Asner
(
- UC, San Diego
)

et al.

- Phys.Rev.D 53 (1996) 1039-1050
•
e-Print:
- hep-ex/9508004
•
DOI:
- 10.1103/PhysRevD.53.1039

[17]

Smoothing of Poisson distributed data.

V. Blobel

- http://www.desy.de/blobel/splft.f

Measurement of the branching fraction of B+→τ+ντB^+ \to \tau^+ \nu_\tauB+→τ+ντ​ decays with the semileptonic tagging method and the full Belle data sample

Citations per year

Smoothing of Poisson distributed data.

Measurement of the branching fraction of $B^+ \to \tau^+ \nu_\tau$ decays with the semileptonic tagging method and the full Belle data sample