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Measurement of the $B\to D\ell\nu$ Branching Fractions and Form Factor
High Energy Physics - Experiment · Submitted 25 Nov 1998
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We find the decay rate $\Gamma(B \to D\ell\nu)$ = (14.1 +- 1.0 +- 1.2) ns-1 and derive branching fractions for $B^- \to D^0 \ell\nu$ and $\bar{B^0} \to D^+ \ell\nu$ of (2.32 +- 0.17 +- 0.20)% and 2.20 +- 0.16 +- 0.19)% respectively, where the uncertainties are statistical and systematic.
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The abstract, sentence by sentence
Using a sample of 3.3 million B-meson decays collected with the CLEO detector at the Cornell Electron Storage Ring, we have studied $B^- \to D^0 \ell\nu$ and $\bar{B}^0 \to D^+ \ell\nu$ decays, where $\ell$ can be either an electron or muon. We distinguish $B \to D \ell\nu$ from other B semileptonic decays by examining the net momentum and energy of the particles recoiling against the D-lepton pairs. We find the decay rate $\Gamma(B \to D\ell\nu)$ = (14.1 +- 1.0 +- 1.2) ns-1 and derive branching fractions for $B^- \to D^0 \ell\nu$ and $\bar{B^0} \to D^+ \ell\nu$ of (2.32 +- 0.17 +- 0.20)% and 2.20 +- 0.16 +- 0.19)% respectively, where the uncertainties are statistical and systematic. We also investigate the $B \to D \ell\nu$ form factor and the implication of the result for $|V_{cb}|$.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | Using a sample of 3.3 million B-meson decays collected with the CLEO detector at the Cornell Electron Storage Ring, we have studied $B^- \to D^0 \ell\nu$ and $\bar{B}^0 \to D^+ \ell\nu$ decays, where $\ell$ can be either an electron or muon. | method 0.73 | 0.95 | 0.03 | asserted 0.96 |
| s1 | We distinguish $B \to D \ell\nu$ from other B semileptonic decays by examining the net momentum and energy of the particles recoiling against the D-lepton pairs. | method 1.00 | 0.92 | 0.02 | asserted 1.00 |
| s2 | We find the decay rate $\Gamma(B \to D\ell\nu)$ = (14.1 +- 1.0 +- 1.2) ns-1 and derive branching fractions for $B^- \to D^0 \ell\nu$ and $\bar{B^0} \to D^+ \ell\nu$ of (2.32 +- 0.17 +- 0.20)% and 2.20 +- 0.16 +- 0.19)% respectively, where the uncertainties are statistical and systematic. | result 1.00 | 0.98 | 0.77 | asserted 1.00 |
| s3 | We also investigate the $B \to D \ell\nu$ form factor and the implication of the result for $|V_{cb}|$. | contribution 0.89 | 0.89 | 0.07 | asserted 0.68 |
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The paper
Original abstract
Using a sample of 3.3 million B-meson decays collected with the CLEO detector at the Cornell Electron Storage Ring, we have studied $B^- \to D^0 \ell\nu$ and $\bar{B}^0 \to D^+ \ell\nu$ decays, where $\ell$ can be either an electron or muon. We distinguish $B \to D \ell\nu$ from other B semileptonic decays by examining the net momentum and energy of the particles recoiling against the D-lepton pairs. We find the decay rate $\Gamma(B \to D\ell\nu)$ = (14.1 +- 1.0 +- 1.2) ns-1 and derive branching fractions for $B^- \to D^0 \ell\nu$ and $\bar{B^0} \to D^+ \ell\nu$ of (2.32 +- 0.17 +- 0.20)% and 2.20 +- 0.16 +- 0.19)% respectively, where the uncertainties are statistical and systematic. We also investigate the $B \to D \ell\nu$ form factor and the implication of the result for $|V_{cb}|$.
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References
How the literature uses it
5 arXiv papers cite this in 7 sentences
Papers citing it · 2 sentences without a confident label
Uses its data or values 3 papers
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The HFAG average value $η̅_EW |V_cb| G(1)$ is $0.04264(72)_stat(135)_syst$ [ref] , which combines five experimental measurements from ALEPH [ref] , Belle [ref] , BaBar [ref] , and CLEO [ref] .
The $B \to D \ell \nu$ form factors at nonzero recoil and $|V_{cb}|$ from $2+1$-flavor lattice QCD · Discussion and outlook · 0.99
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[ref], the Belle [ref] and Cleo [ref] data on $|V_cb G(w)|$ and the HFAG fit to the data from eq.
B -> D tau nu Branching Ratios: Opportunity for Lattice QCD and Hadron Colliders · Introduction · 1.00
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The CLEO measurement [ref] provides only the isospin-averaged rate, i.e., a single observable.
$\bar B\to D^{(*)}\ell\bar \nu$ Branching Ratios and Evidence for Isospin Breaking in $\Upsilon(4S)$ Decays · CLEO'98 CITEMARK62Z · 0.91
Compares with it 1 paper
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Apart from the slightly different treatment of external input parameters and correlations detailed above, the main differences to the HFLAV average in Ref. [ref] are the following, see Appendix [ref] for more details: * Corrected treatment of the branching fraction information from the CLEO measurements [ref] . * Consistent treatment of the inclusive branching ratio for used in Refs. [ref] . * Accounting for d'Agostini bias in Refs. [ref] and [ref] , as discussed above, see Fig. [ref]. * Inclusion of the Belle-II measurement [ref] , which supersedes the preliminary results given in the proceeding article [ref] .
$\bar B\to D^{(*)}\ell\bar \nu$ Branching Ratios and Evidence for Isospin Breaking in $\Upsilon(4S)$ Decays · Treatment of common input parameters and correlations · 0.88
Cites it as background 1 paper
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Several previous measurements exist for the branching fractions and the FFs in the $$ decay [ref] .
Model-independent extraction of form factors and $|V_{cb}|$ in $\overline{B} \rightarrow D \ell^- \overline{\nu}_\ell$ with hadronic tagging at BaBar · Introduction · 0.98
Discussion
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