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

DataBETA

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

BaBar

Collaboration

•

J.P. Lees
(
- Annecy, LAPP
)

Jul, 2012

9 pages

Published in:

Phys.Rev.D 88 (2013) 3, 031102

Published: Aug 8, 2013

e-Print:

1207.0698 [hep-ex]

DOI:

10.1103/PhysRevD.88.031102

PDG:

{{\mathit B}^{+}}

\rightarrow

{{\mathit \tau}^{+}}{{\mathit \nu}_{{{\tau}}}}

Report number:

BABAR-PUB-12-20,
SLAC-PUB-15134,
BABAR-PUB-12-020

Experiments:

SLAC-PEP2-BABAR

View in:

reference search211 citations

Citations per year

Abstract: (APS)

We present a search for the decay B+→τ+ν using 467.8×106 BB¯ pairs collected at the Υ(4S) resonance with the BABAR detector at the SLAC PEP-II B-Factory. We select a sample of events with one completely reconstructed B- in the hadronic decay mode (B-→D(*)0X- and B-→J/ψX-). We examine the rest of the event to search for a B+→τ+ν decay. We identify the τ+ lepton in the following modes: τ+→e+νν¯, τ+→μ+νν¯, τ+→π+ν¯ and τ+→ρ+ν¯. We find an excess of events with respect to the expected background, which excludes the null signal hypothesis at the level of 3.8σ (including systematic uncertainties) and corresponds to a branching fraction value of B(B+→τ+ν)=(1.83-0.49+0.53(stat)±0.24(syst))×10-4.

Note:

8 pages, 10 figures, submitted to Phys. Rev. D (Rapid Communications)

13.20.-v
13.25.Hw
B+: leptonic decay
B+: branching ratio: measured
BaBar
Higgs particle: doublet: 2
CKM matrix
electron positron: annihilation
B: pair production
B-: hadronic decay

References(22)

Figures(11)

[1]

Charge-conjugate modes are implied throughout the paper

[2]

N. Cabibbo

- Phys.Rev.Lett. 8 (1964) 214

[2]

CP Violation in the Renormalizable Theory of Weak Interaction

Makoto Kobayashi
(
- Kyoto U.
)
,
Toshihide Maskawa
(
- Kyoto U.
)

- Prog.Theor.Phys. 49 (1973) 652-657,
- Also in *Lichtenberg, D. B. (Ed.), Rosen, S. P. (Ed.): Developments In The Quark Theory Of Hadrons, Vol. 1*, 218-223.
•
DOI:
- 10.1143/PTP.49.652

[3]

The $B$ and $B_s$ Meson Decay Constants from Lattice QCD

Heechang Na
(
- Ohio State U.
)
,
Chris J. Monahan
(
- William-Mary Coll.
)
,
Christine T.H. Davies
(
- Glasgow U.
)
,
Ron Horgan
(
- Cambridge U., DAMTP
)
,
G.Peter Lepage
(
- Cornell U., LEPP
)

et al.

- Phys.Rev.D 86 (2012) 034506
•
e-Print:
- 1202.4914
•
DOI:
- 10.1103/PhysRevD.86.034506

[4]

M.F. Sevilla

[5]

Study of $\bar{B}\to X_u \ell \bar{\nu}$ decays in $B\bar{B}$ events tagged by a fully reconstructed B-meson decay and determination of $\|V_{ub}\|$

BaBar

Collaboration

•

J.P. Lees
(
- Annecy, LAPP
)

et al.

- Phys.Rev.D 86 (2012) 032004
•
e-Print:
- 1112.0702
•
DOI:
- 10.1103/PhysRevD.86.032004

[6]

Enhanced charged Higgs boson effects in B- ---> tau anti-neutrino, mu anti-neutrino and b ---> tau anti-neutrino + X

Wei-Shu Hou
(
- Taiwan, Natl. Taiwan U.
)

- Phys.Rev.D 48 (1993) 2342-2344
•
DOI:
- 10.1103/PhysRevD.48.2342

[7]

The Effect of H+- on B+- ---> tau+- nu(tau) and B+- ---> mu+- muon neutrino

- J.Phys.G 29 (2003) 2311-2317
•
e-Print:
- hep-ph/0306037
•
DOI:
- 10.1088/0954-3899/29/10/301

[8]

A Search for $B^{+} \to \tau^{+} \nu$ with Hadronic $B$ tags

BaBar

Collaboration

•

Bernard Aubert
(
- Annecy, LAPP
)

et al.

- Phys.Rev.D 77 (2008) 011107
•
e-Print:
- 0708.2260
•
DOI:
- 10.1103/PhysRevD.77.011107

[9]

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

[10]

Seeing the Invisible Axion in the Sparticle Spectrum

Joseph P. Conlon
(
- Cambridge U., DAMTP
)

- Phys.Rev.Lett. 97 (2006) 261802
•
e-Print:
- hep-ph/0607138
•
DOI:
- 10.1103/PhysRevLett.97.261802

[11]

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

[12]

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

[12]

W. Menges

- IEEE Nucl.Sci.Symp.Conf.Rec. 5 (2006) 1470

[13]

GEANT4 - A Simulation Toolkit

GEANT4

Collaboration

•

S. Agostinelli
(
- Genoa U.
)

et al.

- Nucl.Instrum.Meth.A 506 (2003) 250-303
•
DOI:
- 10.1016/S0168-9002(03)01368-8

[14]

Reconstruction of B Mesons

ARGUS

Collaboration

•

H. Albrecht
(
- DESY
)

et al.

- Phys.Lett.B 185 (1987) 218,
- Berkeley High Energy Phys.1986:660
•
DOI:
- 10.1016/0370-2693(87)91558-9

[15]

A Study of the Reactions $\psi^\prime \to \gamma \gamma \psi$

M. Oreglia
(
- SLAC
)

- SLAC Stanford - SLAC-236 (80,REC.APR. 81) 226p

[15]

Charmonium Spectroscopy From Radiative Decays of the $J/\psi$ and $\psi^\prime$

John Erthal Gaiser
(
- SLAC
)

- SLAC Stanford - SLAC-255 (82,REC.JUN.83) 194p

[15]

A study of the radiative CASCADE transitions between the Upsilon-Prime and Upsilon resonances

Tomasz Skwarnicki
(
- Cracow, INP and
- DESY
)

[16]

Event Shapes in e+ e- Annihilation

Geoffrey C. Fox
(
- Caltech
)
,
Stephen Wolfram
(
- Caltech
)

- Nucl.Phys.B 149 (1979) 413,
- Nucl.Phys.B 157 (1979) 543 (erratum)
•
DOI:
- 10.1016/0550-3213(79)90120-2

[17]

A QCD Test for Jets

Edward Farhi
(
- Harvard U.
)

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

[18]

Evidence for an excess of $\bar{B} \to D^{(*)} \tau^-\bar{\nu}_\tau$ decays

BaBar

Collaboration

•

J.P. Lees
(
- Annecy, LAPP
)

et al.

- Phys.Rev.Lett. 109 (2012) 101802
•
e-Print:
- 1205.5442
•
DOI:
- 10.1103/PhysRevLett.109.101802