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arxiv: 2411.18639 · v2 · submitted 2024-11-25 · ✦ hep-ex

Recognition: 1 theorem link

· Lean Theorem

Averages of b-hadron, c-hadron, and τ-lepton properties as of 2023

Sw. Banerjee , E. Ben-Haim , F. Bernlochner , E. Bertholet , M. Bona , A. Bozek , C. Bozzi , J. Brodzicka
show 30 more authors
V. Chobanova M. Chrzaszcz U. Egede M. Gersabeck P. Goldenzweig N. Gharbi L. Grillo K. Hayasaka T. Humair D. Johnson T. Kuhr O. Leroy A. Lusiani H.-L. Ma M. Margoni R. Mizuk P. Naik T. Nanut Petri A. Pereiro Castro M. Prim M. Roney M. Rotondo O. Schneider C. Schwanda A. J. Schwartz J. Serrano B. Shwartz A. Soffer M. Whitehead J. Yelton
Authors on Pith no claims yet

Pith reviewed 2026-05-16 22:27 UTC · model grok-4.3

classification ✦ hep-ex
keywords b-hadronc-hadrontau-leptonworld averagesbranching fractionslifetimesCKM matrixCP violation
0
0 comments X

The pith

This paper reports updated world averages for b-hadron, c-hadron, and tau-lepton properties from measurements before October 2023.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The Heavy Flavour Averaging Group has compiled world averages for a range of properties including branching fractions, lifetimes, neutral meson mixing, CP violation, semileptonic decays, and Cabibbo-Kobayashi-Maskawa matrix elements. Common input parameters from different experiments are rescaled to agreed reference values, and known correlations are incorporated into the averaging. These averages serve as the current standard reference for heavy flavor physics. A sympathetic reader cares because they provide the most precise constraints currently available on flavor-changing processes and CKM parameters.

Core claim

The paper reports world averages of measurements of b-hadron, c-hadron, and τ-lepton properties obtained by the Heavy Flavour Averaging Group using results available before October 2023. In rare cases, significant results obtained several months later are also used. For the averaging, common input parameters used in the various analyses are adjusted to common values, and known correlations are taken into account. The averages include branching fractions, lifetimes, neutral meson mixing parameters, CP violation parameters, parameters of semileptonic decays, and Cabibbo-Kobayashi-Maskawa matrix elements.

What carries the argument

The averaging procedure that rescales common input parameters to agreed reference values while accounting for correlations between experimental measurements.

Load-bearing premise

All relevant correlations between the input experimental measurements have been correctly identified and the rescaling of common parameters to agreed reference values does not introduce bias into the final averages.

What would settle it

A new independent analysis of the underlying experimental data that produces averages differing significantly from those reported here, for example in the tau lepton lifetime or a specific branching fraction, would indicate that the current world averages are not accurate.

read the original abstract

This paper reports world averages of measurements of $b$-hadron, $c$-hadron, and $\tau$-lepton properties obtained by the Heavy Flavour Averaging Group using results available before October 2023. In rare cases, significant results obtained several months later are also used. For the averaging, common input parameters used in the various analyses are adjusted (rescaled) to common values, and known correlations are taken into account. The averages include branching fractions, lifetimes, neutral meson mixing parameters, CP violation parameters, parameters of semileptonic decays, and Cabibbo-Kobayashi-Maskawa matrix elements.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

0 major / 2 minor

Summary. This paper reports world averages of b-hadron, c-hadron, and τ-lepton properties compiled by the Heavy Flavour Averaging Group from experimental results available before October 2023 (with rare later inclusions). Common input parameters are rescaled to agreed reference values and known correlations are incorporated. The averages cover branching fractions, lifetimes, neutral meson mixing and CP violation parameters, semileptonic decay parameters, and CKM matrix elements.

Significance. If the input measurements and correlations are faithfully represented, these averages constitute an essential, regularly updated reference for the flavor physics community. They enable consistent inputs for precision tests of the Standard Model, CKM fits, and new-physics searches, building directly on the long-established HFAG methodology of rescaling shared parameters and accounting for correlations.

minor comments (2)
  1. The abstract states that 'in rare cases, significant results obtained several months later are also used'; a brief footnote or sentence in §1 identifying the specific results and the cutoff date would improve transparency without altering the central claim.
  2. Tables listing the final averages would benefit from an explicit column or footnote indicating the number of input measurements and the dominant correlation sources for each entry, to allow readers to assess the robustness of the quoted uncertainties at a glance.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for the careful review and for recommending acceptance of the manuscript. The referee's summary accurately reflects the scope, methodology, and importance of the HFAG world averages.

Circularity Check

0 steps flagged

No significant circularity in the averaging procedure

full rationale

The paper compiles world averages from independent experimental measurements of b-hadron, c-hadron, and τ-lepton properties. It adjusts common input parameters to agreed external reference values and incorporates reported correlations using established HFAG statistical procedures. No derivation step reduces by construction to a fitted parameter, self-defined quantity, or load-bearing self-citation; the inputs are external data and the output is a weighted average that does not presuppose its own results. The procedure is self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central output consists of statistical combinations of existing measurements; the paper relies on the correctness of the input experimental results and on the validity of the correlation estimates supplied by the original analyses.

axioms (1)
  • domain assumption Input measurements are unbiased and their reported uncertainties and correlations are accurate.
    Standard assumption for any world-average compilation; invoked when combining results from different experiments.

pith-pipeline@v0.9.0 · 5597 in / 1255 out tokens · 37909 ms · 2026-05-16T22:27:43.382701+00:00 · methodology

discussion (0)

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Lean theorems connected to this paper

Citations machine-checked in the Pith Canon. Every link opens the source theorem in the public Lean library.

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Forward citations

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Reference graph

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