Extraction of $V_{ub}$ from the Decay $B\to \pi l \nu$

Hoi-Lai Yu; Hsiang-nan Li

RECORD

Extraction of $V_{ub}$ from the Decay $B\to \pi l \nu$

Hsiang-nan Li, Hoi-Lai Yu

High Energy Physics - Phenomenology · Submitted 15 Sep 1994

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim Combining predictions from the soft pion theorems, we extract the value of the matrix element $|V_{ub}|$ which is roughly $2.7\times 10^{-3}$.

how it is stated · asserted 0.84 read the record →

Comment (0) Read on arXiv ↗

Cite ▾

Claim paper

The compiled record

The paper's own sentences, arranged. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.

Open the compiled record

Compiled by classifier-1.13-20260917 via OpenRouter, question bank abstract-p1-20260923, 2026-09-23: 1 request, 2,996 input tokens, $0.0001 reported.

What the abstract itself states, as probabilities: claims first 0.03 · states limitation 0.88 · human participants 0.01 · controlled comparison 0.02 · randomized assignment 0.01 · states quantitative result 0.98 · compares with prior results 0.19 · mentions code or data availability 0.02.

The abstract, sentence by sentence

arXiv listing abstract v1. Results and the main claim are underlined; show every role.

We develop the perturbative QCD formalism including Sudakov effects for semi-leptonic $B$ meson decays. We evaluate the differential decay rate of $B\to \pi l \nu$, and find that the perturbative calculation is reliable for the energy fraction of the pion above 0.3. Combining predictions from the soft pion theorems, we extract the value of the matrix element $|V_{ub}|$ which is roughly $2.7\times 10^{-3}$.

background contribution method result interpretation main claim

What the classifier reports for each sentence. The number is the probability it gave the label.
#	sentence	role	the authors' own work	states the main conclusion	strength
s0	We develop the perturbative QCD formalism including Sudakov effects for semi-leptonic $B$ meson decays.	method 0.59	0.94	0.05	asserted 0.99
s1	We evaluate the differential decay rate of $B\to \pi l \nu$, and find that the perturbative calculation is reliable for the energy fraction of the pion above 0.3.	result 0.81	0.96	0.11	asserted 1.00
s2	Combining predictions from the soft pion theorems, we extract the value of the matrix element $\|V_{ub}\|$ which is roughly $2.7\times 10^{-3}$.	result 1.00	0.93	0.88	asserted 0.84

What kind of paper the classifier reports this is: theoretical result 0.98 · evidence from proof or derivation 0.94.

What was examined, and what was not

sources read

arXiv listing abstract v1

not examined

full text
figures and tables
references and citing sentences
relations to other papers

levels run

P abstract

not run

S sections
T body sentences
C citations
R cross-paper relations

Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. Every number in the measurements table is the authors', checked by code. Record as JSON

The paper

Original abstract

We develop the perturbative QCD formalism including Sudakov effects for semi-leptonic $B$ meson decays. We evaluate the differential decay rate of $B\to \pi l \nu$, and find that the perturbative calculation is reliable for the energy fraction of the pion above 0.3. Combining predictions from the soft pion theorems, we extract the value of the matrix element $|V_{ub}|$ which is roughly $2.7\times 10^{-3}$.

Human review

How Pith checks papers → · Full audit of this paper →

References

Forward citations

Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. OpenAlex reports about 202 citations worldwide. Full citation record

$\psi(3S)$ and $\eta_c(3S)$ production in the $B^+$ decay processes
hep-ph 2026-10 conditional novelty 5.0 of 10

B+ -> K+ psi(4040) branching fraction is reproduced by adding meson-loop contributions to perturbative QCD; a prediction for B+ -> K+ eta_c(3S) is made.
B Meson Semi-Invisible Decays via Perturbative QCD
hep-ph 2026-06 unverdicted novelty 3.0 of 10

pQCD plus flavor symmetry yields O(10^{-5}) branching ratios for selected B to baryon + dark baryon decays in Type-I and Type-II scenarios.

How the literature uses it

8 arXiv papers cite this in 10 sentences

Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

Papers whose main result relates to this one's

Found among the papers closest to this one by title and main claim. Pith's classifier compared each pair's main results and a second model family confirmed the relation; checked against two further families, shown conflicts agreed 118 times in 120 and shown same results 218 times in 239. The quoted sentence is the other paper's main claim.

States the same result 1 paper

By combining predictions from the soft pion theorems, we estimate that the upper limit of the KM matrix element $|V_{ub}|$ is roughly 0.003.

Perturbative QCD Analysis of $B$ Meson Decays · 0.92

Papers citing it · 5 sentences without a confident label

Uses its method or tool 2 papers

The $k_T$ resummation is thus applied to the baryon wave functions to extract the Sudakov factors [ref] as in its application to meson wave functions [ref] .

$\Lambda_b\to p$ transition form factors in perturbative QCD · $k_T$ factorization · 0.80
With the effective Hamiltonians at hand, one can in principle calculate the transition amplitude via the QCD factorization approach [ref] or perturbative QCD approach [ref] , etc..

CP violation induced by the interference of scalar and vector resonances in three-body decays of bottom mesons · Application to $B^±→K^±π^+π^-$ · 0.95

Cites it as support 1 paper

Previous studies have substantiated this point, as elaborated in Refs. [ref] .

Probing $B^+ \to K^+$ semi-leptonic FCNC decay with new physics effects under PQCD approach · Kinematics and Wave Functions · 0.99

Cites it as background 2 papers

Three different approaches to factorization in $B$ decays have been put forward: the so-called QCD factorization [ref] , perturbative QCD (PQCD) [ref] and Soft-Collinear Effective Theory (SCET) [ref] .

Searching for New Physics in b to s Hadronic Penguin Decays · Evaluation of hadronic matrix elements · 0.81
The theoretical approaches based on factorization theorems in the heavy quark limit include light-cone QCD sum rules (LCSR) [ref] , the QCD-improved factorization (QCDF) [ref] , the perturbative QCD (PQCD) factorization [ref] , and the soft-collinear effective theory (SCET) [ref] .

Global Analysis of hadronic two-body B decays in the perturbative QCD approach · Introduction · 0.95

Discussion

Know something about this paper? Leave a comment, or highlight any passage above to comment on it.