Measurement of the decays $\boldsymbol{B\to\eta\ell\nu_\ell}$ and $\boldsymbol{B\to\eta^\prime\ell\nu_\ell}$ in fully reconstructed events at Belle - INSPIRE

DataBETA

Measurement of the decays $\boldsymbol{B\to\eta\ell\nu_\ell}$ and $\boldsymbol{B\to\eta^\prime\ell\nu_\ell}$ in fully reconstructed events at Belle

Belle

Collaboration

•

C. Beleño
(
- Gottingen U., II. Phys. Inst.
)

Mar 29, 2017

8 pages

Published in:

Phys.Rev.D 96 (2017) 9, 091102

Published: Nov 28, 2017

e-Print:

1703.10216 [hep-ex]

DOI:

10.1103/PhysRevD.96.091102

PDG:

{{\mathit B}^{+}}

\rightarrow

{{\mathit \eta}}{{\mathit \ell}^{+}}{{\mathit \nu}_{{{{{\mathit \ell}}}}}}

Experiments:

KEK-BF-BELLE

View in:

ADS Abstract Service

reference search10 citations

Citations per year

Abstract: (APS)

We report branching fraction measurements of the decays B+→ηℓ+νℓ and B+→η′ℓ+νℓ based on 711 fb-1 of data collected near the ϒ(4S) resonance with the Belle experiment at the KEKB asymmetric-energy e+e- collider. This data sample contains 772 million BB¯ events. One of the two B mesons is fully reconstructed in a hadronic decay mode. Among the remaining (“signal-B”) daughters, we search for the η meson in two decay channels, η→γγ and η→π+π-π0, and reconstruct the η′ meson in η′→ηπ+π- with subsequent decay of the η into γγ. Combining the two η modes and using an extended maximum likelihood, the B+→ηℓ+νℓ branching fraction is measured to be (4.2±1.1(stat.)±0.3(syst.))×10−5. For B+→η′ℓ+νℓ, we observe no significant signal and set an upper limit of 0.72×10-4 at 90% confidence level.

Note:

8 pages, 4 figures

electron positron: annihilation
electron positron: colliding beams
B: pair production
B+: semileptonic decay
B+: branching ratio: measured
B+: branching ratio: upper limit
photon: pair production
eta: radiative decay
pi: multiple production
eta(958): hadronic decay

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