Leptoquarks facing flavour tests and $b\to s\ell\ell$ after Moriond 2021

A. M. Teixeira; C. Hati; J. Kriewald; J. Orloff

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Leptoquarks facing flavour tests and $b\to s\ell\ell$ after Moriond 2021

J. Kriewald, C. Hati, J. Orloff, A. M. Teixeira

High Energy Physics - Phenomenology · Submitted 31 Mar 2021

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

The authors' main claim We also argue how the evolution of the experimental determination of $R_{D^{(*)}}$ can prove instrumental in falsifying a vector leptoquark explanation of the anomalous $B$-meson decay data.

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arXiv ID2104.00015 (version 1)

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CitationA. M. Teixeira, C. Hati, J. Kriewald, J. Orloff. "Leptoquarks facing flavour tests and $b\to s\ell\ell$ after Moriond 2021." arXiv:2104.00015 (2021). https://pith.science/paper/3B4SBJQP

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What the abstract itself states, as probabilities: claims first 0.03 · states limitation 0.18 · human participants 0.02 · controlled comparison 0.05 · randomized assignment 0.01 · states quantitative result 0.05 · compares with prior results 0.35 · mentions code or data availability 0.02.

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In view of the emerging hints for the violation of lepton flavour universality in several $B$-meson decays, we conduct a model-independent study (effective field theory approach) of several well-motivated new physics scenarios. Taking into account the most recent LHCb data, we provide updates to Wilson coefficient fits for numerous popular new physics hypotheses. We also consider a promising model of vector leptoquarks, which in addition to explaining the $B$-meson decay anomalies ($R_{K^{(*)}}$ and $R_{D^{(*)}}$) would have an extensive impact for numerous flavour observables. We identify promising decay modes allowing to (indirectly) probe such an extension: these include positive signals (at Belle II or LHCb) for $\tau\to \phi \mu$, $B_{(s)}$-meson decays to $\tau^+ \tau^-$ and $\tau^+ \mu^-$ ($\tau^+ e^-$) final states, as well as an observation of certain charged lepton flavour violation transitions at COMET and Mu2e. We also argue how the evolution of the experimental determination of $R_{D^{(*)}}$ can prove instrumental in falsifying a vector leptoquark explanation of the anomalous $B$-meson decay data.

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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	In view of the emerging hints for the violation of lepton flavour universality in several $B$-meson decays, we conduct a model-independent study (effective field theory approach) of several well-motivated new physics scenarios.	contribution 0.80	0.89	0.04	asserted 0.74
s1	Taking into account the most recent LHCb data, we provide updates to Wilson coefficient fits for numerous popular new physics hypotheses.	contribution 0.85	0.93	0.05	asserted 0.98
s2	We also consider a promising model of vector leptoquarks, which in addition to explaining the $B$-meson decay anomalies ($R_{K^{()}}$ and $R_{D^{()}}$) would have an extensive impact for numerous flavour observables.	contribution 0.89	0.31	0.15	hedged possibility 0.63
s3	We identify promising decay modes allowing to (indirectly) probe such an extension: these include positive signals (at Belle II or LHCb) for $\tau\to \phi \mu$, $B_{(s)}$-meson decays to $\tau^+ \tau^-$ and $\tau^+ \mu^-$ ($\tau^+ e^-$) final states, as well as an observation of certain charged lepton flavour violation transitions at COMET and Mu2e.	contribution 0.61	0.78	0.21	hedged possibility 0.67
s4	We also argue how the evolution of the experimental determination of $R_{D^{(*)}}$ can prove instrumental in falsifying a vector leptoquark explanation of the anomalous $B$-meson decay data.	interpretation 0.67	0.64	0.24	hedged possibility 0.72

What kind of paper the classifier reports this is: theoretical result 0.91 · evidence from analysis of existing data 0.98.

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The paper

Original abstract

In view of the emerging hints for the violation of lepton flavour universality in several $B$-meson decays, we conduct a model-independent study (effective field theory approach) of several well-motivated new physics scenarios. Taking into account the most recent LHCb data, we provide updates to Wilson coefficient fits for numerous popular new physics hypotheses. We also consider a promising model of vector leptoquarks, which in addition to explaining the $B$-meson decay anomalies ($R_{K^{(*)}}$ and $R_{D^{(*)}}$) would have an extensive impact for numerous flavour observables. We identify promising decay modes allowing to (indirectly) probe such an extension: these include positive signals (at Belle II or LHCb) for $\tau\to \phi \mu$, $B_{(s)}$-meson decays to $\tau^+ \tau^-$ and $\tau^+ \mu^-$ ($\tau^+ e^-$) final states, as well as an observation of certain charged lepton flavour violation transitions at COMET and Mu2e. We also argue how the evolution of the experimental determination of $R_{D^{(*)}}$ can prove instrumental in falsifying a vector leptoquark explanation of the anomalous $B$-meson decay data.

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References

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

Interplay of dineutrino modes with semileptonic rare $\boldsymbol{B}$-decays
hep-ph 2021-09 conditional novelty 5.0 of 10

Using the Standard Model's SU(2) link between dineutrino and charged-dilepton couplings, the authors predict that lepton universality forces the B0 to K*0 neutrino-pair to B0 to K0 neutrino-pair branching ratio into 1...
Muon $g-2$ and $B$-anomalies from Dark Matter
hep-ph 2021-04 conditional novelty 5.0 of 10

A systematic classification of minimal four-field extensions of the Standard Model shows that a thermal dark matter candidate can simultaneously address the muon g-2 discrepancy and the b to s lepton-lepton B-meson anomalies.
Implications of new evidence for lepton-universality violation in $b\to s\ell^+\ell^-$ decays
hep-ph 2021-03 conditional novelty 4.0 of 10

Combining R_K, R_K* and B_s to mu mu measurements, the authors find 4.0 sigma tension with the Standard Model and best-fit new-physics couplings to muons of delta C9 = -0.82 or delta C10 = +0.65.

How the literature uses it

10 arXiv papers cite this in 17 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 citing it · 16 sentences without a confident label

Uses its method or tool 1 paper

We follow a similar approach as Ref. [ref] , where also the flavio package is used and refer to this reference for details.

Interplay of dineutrino modes with semileptonic rare $\boldsymbol{B}$-decays · Global $b →s$ fits · 1.00

What it cites · 12 sentences without a confident label

Uses data or values from 1 paper

However, we have decided to refrain from ``digitising''the plots presented on slides, and thus cannot take into account the update in a consistent manner for the present fits. their measurement of $ = 0.846^+0.044_-0.041$~ [ref] with the deviation to the SM prediction now reaching $3.1\, $, thus providing the first evidence of LFU violation~ For an (animated) overview of how the fit to $ $ data has evolved upon inclusion of the new measurements see http://moriond.in2p3.fr/2021/EW/slides/ani_fit_evo.mp4 bluehttp://moriond.in2p3.fr/2021/EW/slides/ani\_fit\_evo.mp4..

2103.11769 · Introduction · 0.96

Cites as background 3 papers

Model-independent fits by other groups have since appeared in [ref] , while updated studies on $V_1$ leptoquark scenarios can be found in [ref] .

On the single leptoquark solutions to the $B$-physics anomalies · Additional updates on global fits · 0.86
Model-independent fits by other groups have since appeared in [ref] , while updated studies on $V_1$ leptoquark scenarios can be found in [ref] .

Implications of new evidence for lepton-universality violation in $b\to s\ell^+\ell^-$ decays · Additional updates on global fits · 0.86
Several rare $B$-decays involving tau-leptons and nnumerous LFV tau-decays are expected to be searched for by the Belle II experiment [ref] with improved sensitivities.

1808.10567 · Vector leptoquarks · 0.84

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