High Energy Physics - Experiment · arXiv:1604.04940 v2 · submitted 17 Apr 2016
Experimental Status of the CKM Matrix
The paper says
“While there remain some issues the overall agreement with standard model unitarity is good.”
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The paper
Abstract
The CKM matrix, V, relates the quark mass and flavor bases. In the standard model, V is unitary 3X3, and specified by four arbitrary parameters, including a phase allowing for CP violation. We review the experimental determination of V, including the four parameters in the standard model context. This is an active field; the precision of experimental measurements and theoretical inputs continues to improve. The consistency of the determination with the standard model unitarity is investigated. While there remain some issues the overall agreement with standard model unitarity is good.
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abstract compiled · 2026-09-23 · no language-model review
How the main claim is stated: asserted 0.88
What the abstract itself states, as probabilities: claims first 0.02 · states limitation 0.55 · human participants 0.02 · controlled comparison 0.08 · randomized assignment 0.01 · states quantitative result 0.05 · compares with prior results 0.21 · mentions code or data availability 0.02
The abstract, sentence by sentence
This table labels the abstract only (arXiv listing abstract v2). The number is the probability the classifier gave the label.
| Sentence | Role | The authors' own work | States the main conclusion | Strength |
|---|---|---|---|---|
| The CKM matrix, V, relates the quark mass and flavor bases. | background 1.00 | 0.04 | 0.02 | asserted 1.00 |
| In the standard model, V is unitary 3X3, and specified by four arbitrary parameters, including a phase allowing for $CP$ violation. | background 1.00 | 0.04 | 0.04 | asserted 1.00 |
| We review the experimental determination of V, including the four parameters in the standard model context. | contribution 1.00 | 0.48 | 0.06 | asserted 0.81 |
| This is an active field; the precision of experimental measurements and theoretical inputs continues to improve. | background 0.98 | 0.07 | 0.04 | asserted 1.00 |
| The consistency of the determination with the standard model unitarity is investigated. | contribution 0.92 | 0.65 | 0.09 | asserted 0.62 |
| While there remain some issues the overall agreement with standard model unitarity is good. | result 0.62 | 0.54 | 0.76 | asserted 0.88 |
What kind of paper the classifier reports this is: review 1.00 · evidence from literature 0.63
What was examined, and what was not
Sources read
- arXiv listing abstract v2
Not examined
- full text
- figures and tables
- references and citing sentences
- relations to other papers
Levels run
- P abstract
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- S sections
- T body sentences
- C citations
- R cross-paper relations
How the labels were made
Compiled by classifier-1.13.0 via TypeSafe API, question bank abstract-p1-20260923, 2026-09-23: 1 request, 4,714 input tokens.
Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. This record as JSON
Cited by 1 Pith paper
Reviewed papers on Pith that cite this one. The full citation record
- Building and testing models with extended Higgs sectors hep-ph · Feb 2017
How the literature uses it
2 arXiv papers cite this in 2 sentences
Papers whose main result relates to this one's
States a conflicting result 1 paper
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After the recent high precision determinations of $V_{us}$ and $V_{ud}$, the first row of the CKM matrix shows more than $4\sigma$ deviation from unitarity.
The CKM unitarity problem: A trace of new physics at the TeV scale? · 0.82
What it cites · 164 sentences without a confident label
Uses the method or tool of 9 papers
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Using the parameterization of the CKM matrix in Eq. [ref] we obtain, with appropriate translation from $(ρ,η)$ to $(ρ̅,η̅)$ at the same order in $λ$ [ref] : [equation] We evaluate the constant [equation]
Correlations among new CP violating effects in Delta F = 2 observables · $CP$ violation in kaon mixing · 0.83
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Using the parameterization of the CKM matrix in Eq. [ref] we obtain, with appropriate translation from $(ρ,η)$ to $(ρ̅,η̅)$ at the same order in $λ$ [ref] : [equation] We evaluate the constant [equation]
Kaon Decays in the Standard Model · $CP$ violation in kaon mixing · 0.83
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For the $w$-dependence of the form factors it is conventional to use the formalism in [ref] , where unitarity and analyticity are used to derive constraints on the form factors.
Dispersive Bounds on the Shape of B -> D^(*) l nu Form Factors · $|V_cb|$ · 0.98
Uses data or values from 80 papers
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The most precise measurements of the $D→μν$ branching fraction are from CLEO [ref] , $(3.82±0.32±0.09)×10^-4$ and BESIII [ref] , $(3.71±0.19±0.06)×10^-4$, which may be averaged to obtain [ref] [equation] With the above value for $f_D^+$, this yields, with the appropriately modified Eq. [ref] and neglecting the radiative correction term, $|V_cd|^2 = 0.0467(22)$, or $|V_cd| = 0.216(5)$.
Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2014 · $|V_cd|$ · 1.00
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The Heavy Flavor Averaging Group (HFAG) [ref] has averaged the published results from BaBar [ref] , Belle [ref] , and CLEO-c [ref] for $D_s→ℓν$, corrected for $τ$ branching fractions in [ref] where relevant, obtaining: [equation] Using the appropriately relabled Eq. [ref], neglecting the radiative corrections, but including experimental correlations, these results are combined by HFAG [ref] , obtaining: [equation]
Measurement of the Absolute Branching Fractions for $D^-_s\!\rightarrow\!\ell^-\bar{\nu}_{\ell}$ and Extraction of the Decay Constant $f_{D_s}$ · $|V_cs|$ · 0.99
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The Heavy Flavor Averaging Group (HFAG) [ref] has averaged the published results from BaBar [ref] , Belle [ref] , and CLEO-c [ref] for $D_s→ℓν$, corrected for $τ$ branching fractions in [ref] where relevant, obtaining: [equation] Using the appropriately relabled Eq. [ref], neglecting the radiative corrections, but including experimental correlations, these results are combined by HFAG [ref] , obtaining: [equation]
Measurements of branching fractions of leptonic and hadronic Ds+ meson decays and extraction of the Ds+ meson decay constant · $|V_cs|$ · 0.99
Compares with 5 papers
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This result is very close to the HFAG average [ref] (0.1425(19)), except that we now have the published BESIII result.
Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2014 · $|V_cd|$ · 0.98
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This result is close to the HFAG average [ref] (0.728(5)), except that we now use the published BESIII result for $D^0→K^-e^+ν$ and we also include the BESIII $D^+→K_Le^+ν$ measurement.
Averages of b-hadron, c-hadron, and tau-lepton properties as of early 2012 · $|V_cs|$ · 0.88
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It may be remarked that the present lattice average slightly exceeds the upper bound of $B̂_K ≤0.75$ deduced in the $1/N_c$ expansion [ref] ; this is something to watch.
Large N Approach to Kaon Decays and Mixing 28 Years Later: Delta I = 1/2 Rule, \hat B_K and Delta M_K · $CP$ violation in kaon mixing · 0.86
Cites as background 20 papers
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Thus, we measure $Δm$, which is related to $|V_tq|$ according to (for a review, see, e.g., [ref] , also Section [ref] below): [equation] where $f_B$ is the $B$ decay constant, $B̂_B$ is the (renormalization group invariant) $B$ bag parameter, $x_t≡(m_t/m_W)^2$, and [ref] [equation] QCD corrections to $S_0$ are contained in $η_B=0.551(7)$ [ref] .
Weak Decays Beyond Leading Logarithms · $|V_ts|$ and $|V_td|$ · 0.95
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Thus, we measure $Δm$, which is related to $|V_tq|$ according to (for a review, see, e.g., [ref] , also Section [ref] below): [equation] where $f_B$ is the $B$ decay constant, $B̂_B$ is the (renormalization group invariant) $B$ bag parameter, $x_t≡(m_t/m_W)^2$, and [ref] [equation] QCD corrections to $S_0$ are contained in $η_B=0.551(7)$ [ref] .
Quark mixing, CP violation and rare decays after the top quark discovery · $|V_ts|$ and $|V_td|$ · 0.95
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The UTfit collaboration~ [ref] (home page http://www.utfit.org/UTfit/http://www.utfit.org/UTfit/) is based on Bayesian statistics.
The 2004 UTfit Collaboration Report on the Status of the Unitarity Triangle in the Standard Model · Global Fits · 0.80
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