Model independent constraints on leptoquarks from b -> s l+ l- processes

Nejc Kosnik

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Model independent constraints on leptoquarks from b -> s l+ l- processes

Nejc Kosnik

High Energy Physics - Phenomenology · Submitted 13 Jun 2012

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

The authors' main claim We bound the resulting Wilson coefficients by imposing experimental constraints coming from branching fractions of B -> K l+ l-, B_s -> mu+ mu-, and B -> X_s mu+ mu- decays.

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What the abstract itself states, as probabilities: claims first 0.03 · states limitation 0.19 · human participants 0.01 · controlled comparison 0.02 · randomized assignment 0.01 · states quantitative result 0.46 · compares with prior results 0.06 · mentions code or data availability 0.02.

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We list all scalar and vector leptoquark states that contribute to the b -> s l+ l- effective Hamiltonian. There are altogether three scalar and four vector leptoquarks that are relevant. For contribution of each state we infer the correlations between effective operators and find that only two baryon number-violating vector leptoquarks give rise to scalar and pseudoscalar four-fermion operators, whereas the scalar states can contribute to those operators only when two states with same charge are present. We bound the resulting Wilson coefficients by imposing experimental constraints coming from branching fractions of B -> K l+ l-, B_s -> mu+ mu-, and B -> X_s mu+ mu- decays.

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#	sentence	role	the authors' own work	states the main conclusion	strength
s0	We list all scalar and vector leptoquark states that contribute to the b -> s l+ l- effective Hamiltonian.	contribution 0.86	0.92	0.05	asserted 0.98
s1	There are altogether three scalar and four vector leptoquarks that are relevant.	result 0.60	0.55	0.06	asserted 1.00
s2	For contribution of each state we infer the correlations between effective operators and find that only two baryon number-violating vector leptoquarks give rise to scalar and pseudoscalar four-fermion operators, whereas the scalar states can contribute to those operators only when two states with same charge are present.	result 0.92	0.92	0.24	asserted 1.00
s3	We bound the resulting Wilson coefficients by imposing experimental constraints coming from branching fractions of B -> K l+ l-, B_s -> mu+ mu-, and B -> X_s mu+ mu- decays.	method 0.86	0.92	0.31	asserted 1.00

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The paper

Original abstract

We list all scalar and vector leptoquark states that contribute to the b -> s l+ l- effective Hamiltonian. There are altogether three scalar and four vector leptoquarks that are relevant. For contribution of each state we infer the correlations between effective operators and find that only two baryon number-violating vector leptoquarks give rise to scalar and pseudoscalar four-fermion operators, whereas the scalar states can contribute to those operators only when two states with same charge are present. We bound the resulting Wilson coefficients by imposing experimental constraints coming from branching fractions of B -> K l+ l-, B_s -> mu+ mu-, and B -> X_s mu+ mu- decays.

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Cited by 15 Pith papers

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

Left-Right SU(4) Vector Leptoquark Model for Flavor Anomalies
hep-ph 2018-12 conditional novelty 6.0 of 10

A left-right SU(4) Pati-Salam model with SU(4)_R broken at a high scale keeps the (3,1)_{2/3} vector leptoquark as light as 10 TeV, explaining the R_K and R_K* anomalies while evading lepton-flavor-violation bounds.
$R_K$ and $R_{K^{\ast}}$ beyond the Standard Model
hep-ph 2017-04 conditional novelty 6.0 of 10

Leptoquarks with Standard-Model-like left-handed couplings to muons can simultaneously explain the LHCb R_K and R_K* anomalies, with right-handed admixtures bounded to a few tens of percent.
Benchmark Dark SMEFT Scenarios from the Interplay of Flavor Physics and Dark Matter Searches
hep-ph 2026-09 conditional novelty 5.0 of 10

A correlated flavor-plus-dark-matter analysis of dark-SMEFT operators finds that single-operator scenarios are excluded and that two quark operators plus one lepton operator are required to satisfy all current bounds.
Iso-doublet Vector Leptoquark solution to the Muon $g-2$, $R_{K, K^*}$, $R_{D,D^*}$, and $W$-mass Anomalies
hep-ph 2022-04 conditional novelty 5.0 of 10

The iso-doublet vector leptoquark V2 can fit the B-meson R_K and R_D anomalies and, with a 25-30 GeV isospin splitting, the CDF W-boson mass, but its muon g-2 fit requires a coupling above the perturbative limit.
Muon $g-2$ and scalar leptoquark mixing
hep-ph 2019-10 conditional novelty 5.0 of 10

Higgs-induced mixing of two scalar leptoquarks can generate the chirality-enhanced loop needed for the muon g-2 anomaly, but only the S1&S3 pairing with top-quark loops survives existing constraints.

Show 10 more citing papers

Impact of polarization observables and $ B_c\to \tau \nu$ on new physics explanations of the $b\to c \tau \nu$ anomaly
hep-ph 2018-11 accept novelty 5.0 of 10

The preferred new-physics explanation of the b to c tau nu anomalies flips between scalar and left-handed vector operators depending on the assumed limit on BR(Bc to tau nu), and a new sum rule predicts R(Lambda_c) is...
Lepton-flavor universality violation in $R_K$ and $R_{D^{(*)}}$ from warped space
hep-ph 2017-03 conditional novelty 5.0 of 10

A soft-wall warped model can accommodate R_K with composite b_L and mu_L, but fitting R_D(*) needs a composite tau_L that is in tension with the measured Z-to-tau-left coupling.
Palatable Leptoquark Scenarios for Lepton Flavor Violation in Exclusive $b\to s\ell_1\ell_2$ modes
hep-ph 2016-08 accept novelty 5.0 of 10

A scalar leptoquark doublet of hypercharge 1/6 and a vector triplet of hypercharge 2/3 survive current b to s mu mu data and allow B_s to mu tau and B to K mu tau at rates up to about 10^-5.
Vector leptoquark resolution of $R_K$ and $R_{D^{(*)}}$ puzzles
hep-ph 2015-11 conditional novelty 5.0 of 10

A single TeV-scale vector leptoquark with purely left-handed couplings can fit the R_D(*), R_K and P5' anomalies at once, provided its bottom-to-tau coupling is close to 2.
Lepton flavor non-universality in $b \to s \ell^+ \ell^-$ processes
hep-ph 2015-03 conditional novelty 5.0 of 10

A lepton-specific right-handed coupling fit to B_s to mu mu and B to K mu mu data predicts R_K* = 1.11(8) and R_K*/R_K = 1.27(19), testable at LHCb.
Implications from clean observables for the binned analysis of B -> K*ll at large recoil
hep-ph 2012-07 conditional novelty 5.0 of 10

Binned, form-factor-insensitive angular observables in B -> K* mu mu are defined, predicted in the Standard Model, extracted from LHCb data, and shown to constrain New Physics in the Wilson coefficients C7, C9 and C10.
Complementarity of the constraints on New Physics from B_s -> mu+ mu- and from B -> K l+l- decays
hep-ph 2012-05 conditional novelty 5.0 of 10

Combining the B_s -> mu+mu- bound with the measured B -> K l+l- rate yields joint, phase-sensitive constraints on new-physics Wilson coefficients, with |C_S| < 0.7, |C_P| < 1.0, and 2.2 < sqrt(|C10|^2+|C'10|^2) < 4.8.
A common origin of $R_K$ and neutrino masses
hep-ph 2015-10 conditional novelty 4.0 of 10

Two scalar leptoquarks that fit the R_K anomaly can also produce sub-eV Majorana neutrino masses at one loop via Higgs mixing, for suitable choices of the mixing parameter and leptoquark masses.
Scalar leptoquarks and the rare B meson decays
hep-ph 2015-01 conditional novelty 4.0 of 10

Scalar leptoquarks constrained by B_s,d → μ+μ− data shift R_K into the measured range but leave the B → K μ+μ− isospin asymmetry essentially at its Standard Model value.
Physics of leptoquarks in precision experiments and at particle colliders
hep-ph 2016-03 accept novelty 3.0 of 10

The paper is a comprehensive review of light leptoquark phenomenology, collecting constraints from precision flavor, electroweak, Higgs, and collider observables for proton-stable scenarios.

How the literature uses it

35 arXiv papers cite this in 46 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 · 29 sentences without a confident label

Uses its method or tool 1 paper

We adopt the notation of Ref. [ref] and specify the LQ states by their quantum numbers with respect to the SM gauge group, $(SU(3)_c, SU(2)_L)_Y$, where the electric charge, $Q=Y+T_3$, is the sum of hypercharge ($Y$) and the third weak isospin component ($T_3$).

Palatable Leptoquark Scenarios for Lepton Flavor Violation in Exclusive $b\to s\ell_1\ell_2$ modes · $C_i^ℓ_1ℓ_2(μ)$ in Leptoquark Models · 0.84

Cites it as support 1 paper

Interplay of leptonic and semileptonic $P →P' ℓ^+ ℓ^-$ decays together constrain the couplings of LQ in the $b s̅$ systems very effectively [ref] .

Physics of leptoquarks in precision experiments and at particle colliders · $P →P'(V) ℓ^- ℓ^'+$ · 0.96

Cites it as background 15 papers

The phenomenology of scalar leptoquark and the contribution to new physics has been quite well studied in the literature [ref] .

Study of the rare semileptonic decays $B_d^0 \to K^* l^+ l^-$ in scalar leptoquark model · Introduction · 0.93
In the literature, the observed anomalies at LHCb experiment in various rare decays of $B$ mesons have been studied in the LQ model [ref] .

Impact of vector leptoquark on $\bar B \to \bar K^* l^+ l^-$ anomalies · Introduction · 0.97
This has triggered extensive theoretical work studying the constraining power of radiative and semileptonic $B$ decays on New Physics in the framework of the weak effective Hamiltonian [ref] .

Implications from clean observables for the binned analysis of B -> K*ll at large recoil · Introduction · 0.87

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