Tests of lepton universality with semi-tauonic $b$-quark decays - INSPIRE

DataBETA

Tests of lepton universality with semi-tauonic $b$ -quark decays

LHCb

Collaboration

•

Mark Smith
(
- Imperial Coll., London
)

for the collaboration.

Feb 25, 2019

6 pages

Part of Proceedings, 13th International Conference on Beauty, Charm and Hyperons (BEACH2018) : Peniche, Portugal, June 17-23, 2018

Published in:

J.Phys.Conf.Ser. 1137 (2019) 1, 012017

Contribution to:

- BEACH 2018

Published: Feb 25, 2019

DOI:

10.1088/1742-6596/1137/1/012017

Experiments:

CERN-LHC-LHCb

View in:

CERN Document Server

reference search1 citation

Citations per year

Abstract: (IOP)

Several measurements have shown deviations from lepton universality in tree-level semi-leptonic decays of b hadrons. In these proceedings three LHCb measurements of lepton universality in such decays are presented along with a brief overview for the future possibilities of these and similar observables.

talk: Peniche 2018/06/17
p p: scattering
p p: colliding beams
lepton: universality
bottom: semileptonic decay
tree approximation
CERN LHC Coll
LHC-B
experimental results

References(17)

Figures(0)

[2]

Measurement of the branching ratio of $\bar{B} \to D^{(\ast)} \tau^- \bar{\nu}_\tau$ relative to $\bar{B} \to D^{(\ast)} \ell^- \bar{\nu}_\ell$ decays with hadronic tagging at Belle

Belle

Collaboration

•

M. Huschle
(
- Karlsruhe U., EKP
)

et al.

- Phys.Rev.D 92 (2015) 7, 072014
•
e-Print:
- 1507.03233
•
DOI:
- 10.1103/PhysRevD.92.072014

[3]

Measurement of the $\tau$ lepton polarization and $R(D^)$ in the decay $\bar{B} \to D^ \tau^- \bar{\nu}_\tau$

Belle

Collaboration

•

S. Hirose
(
- Nagoya U.
)

et al.

- Phys.Rev.Lett. 118 (2017) 21, 211801
•
e-Print:
- 1612.00529
•
DOI:
- 10.1103/PhysRevLett.118.211801

[4]

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

[5]

Measurement of the branching ratio of $\bar{B}^0 \rightarrow D^{+} \tau^- \bar{\nu}_{\tau}$ relative to $\bar{B}^0 \rightarrow D^{+} \ell^- \bar{\nu}_{\ell}$ decays with a semileptonic tagging method

Belle

Collaboration

•

Y. Sato
(
- Nagoya U.
)

et al.

- Phys.Rev.D 94 (2016) 7, 072007
•
e-Print:
- 1607.07923
•
DOI:
- 10.1103/PhysRevD.94.072007

Measurement of the ratio of branching fractions $\mathcal{B}(\bar{B}^0 \to D^{+}\tau^{-}\bar{\nu}_{\tau})/\mathcal{B}(\bar{B}^0 \to D^{+}\mu^{-}\bar{\nu}_{\mu})$

LHCb

Collaboration

•

Roel Aaij
(
- CERN
)

et al.

- Phys.Rev.Lett. 115 (2015) 11, 111803,
- Phys.Rev.Lett. 115 (2015) 15, 159901 (erratum)
•
e-Print:
- 1506.08614
•
DOI:
- 10.1103/PhysRevLett.115.111803

Measurement of the ratio of branching fractions $\mathcal{B}(\bar{B}^0 \to D^{+}\tau^{-}\bar{\nu}_{\tau})/\mathcal{B}(\bar{B}^0 \to D^{+}\mu^{-}\bar{\nu}_{\mu})$

LHCb

Collaboration

•

Roel Aaij
(
- CERN
)

et al.

- Phys.Rev.Lett. 115 (2015) 11, 111803,
- Phys.Rev.Lett. 115 (2015) 15, 159901 (erratum)
•
e-Print:
- 1506.08614
•
DOI:
- 10.1103/PhysRevLett.115.111803

[7]

Test of Lepton Flavor Universality by the measurement of the $B^0 \to D^{*-} \tau^+ \nu_{\tau}$ branching fraction using three-prong $\tau$ decays

LHCb

Collaboration

•

R. Aaij

et al.

- Phys.Rev.D 97 (2018) 7, 072013
•
e-Print:
- 1711.02505
•
DOI:
- 10.1103/PhysRevD.97.072013

[8]

Measurement of the ratio of the $B^0 \to D^{-} \tau^+ \nu_{\tau}$ and $B^0 \to D^{-} \mu^+ \nu_{\mu}$ branching fractions using three-prong $\tau$ -lepton decays

LHCb

Collaboration

•

R. Aaij

et al.

- Phys.Rev.Lett. 120 (2018) 17, 171802
•
e-Print:
- 1708.08856
•
DOI:
- 10.1103/PhysRevLett.120.171802

[9]

Averages of $b$ -hadron, $c$ -hadron, and $\tau$ -lepton properties as of summer 2016

HFLAV

Collaboration

•

Y. Amhis
(
- Orsay, LAL
)

et al.

- Eur.Phys.J.C 77 (2017) 12, 895
•
e-Print:
- 1612.07233
•
DOI:
- 10.1140/epjc/s10052-017-5058-4

[10]

Review of Particle Physics

C. Patrignani
(
- Bologna U. and
- INFN, Bologna
)
,
K. Agashe
(
- Maryland U.
)
,
G. Aielli
(
- U. Rome 2, Tor Vergata (main)
)
,
C. Amsler
(
- U. Bern, AEC and
- Stefan Meyer Inst. Subatomare Phys.
)
,
M. Antonelli
(
- Frascati
)

et al.

- Chin.Phys.C 40 (2016) 10, 100001
•
DOI:
- 10.1088/1674-1137/40/10/100001

[11]

Measurement of the ratio of branching fractions $\mathcal{B}(B_c^+\,\to\,J/\psi\tau^+\nu_\tau)$ / $\mathcal{B}(B_c^+\,\to\,J/\psi\mu^+\nu_\mu)$

LHCb

Collaboration

•

R. Aaij

et al.

- Phys.Rev.Lett. 120 (2018) 12, 121801
•
e-Print:
- 1711.05623
•
DOI:
- 10.1103/PhysRevLett.120.121801

[12]

The $B_c$ meson lifetime in the light front constituent quark model

- Phys.Lett.B 452 (1999) 129-136
•
e-Print:
- hep-ph/9812514
•
DOI:
- 10.1016/S0370-2693(99)00273-7

[13]

Exclusive decays and lifetime of $B_c$ meson in QCD sum rules

V.V. Kiselev
(
- Serpukhov, IHEP
)

e-Print:
- hep-ph/0211021

[14]

Exclusive semileptonic and nonleptonic decays of the $B_c$ meson

Mikhail A. Ivanov
(
- Dubna, JINR
)
,
Jurgen G. Korner
(
- Mainz U., Inst. Phys.
)
,
Pietro Santorelli
(
- Naples U. and
- INFN, Naples
)

- Phys.Rev.D 73 (2006) 054024
•
e-Print:
- hep-ph/0602050
•
DOI:
- 10.1103/PhysRevD.73.054024

[15]

Study of exclusive semileptonic and non-leptonic decays of $B_c$ - in a nonrelativistic quark model

- Phys.Rev.D 74 (2006) 074008
•
e-Print:
- hep-ph/0607150
•
DOI:
- 10.1103/PhysRevD.74.074008

[16]

Framework TDR for the LHCb upgrade

Bediaga

[17]

Tech. Rep / (Geneva: CERN) Expression of interest for a phase-II LHCb upgrade: Opportunities in flavour physics, and beyond, in the HL-LHC era

Aaij