Tests of lepton universality using $B^0\to K_S^0{\ell }^{+}{\ell }^{-}$ and $B^{+}\to K^{\ast +}{\ell }^{+}{\ell }^{-}$ decays

Abstract

Tests of lepton universality in $B^0\to K_S^0{\ell }^{+}{\ell }^{-}$ and $B^{+}\to K^{\ast +}{\ell }^{+}{\ell }^{-}$ decays where $\ell$ is either an electron or a muon are presented. The differential branching fractions of $B^0\to K_S^0{e}^{+}{e}^{-}$ and $B^{+}\to K^{\ast +}{e}^{+}{e}^{-}$ decays are measured in intervals of the dilepton invariant mass squared. The measurements are performed using proton-proton collision data recorded by the LHCb experiment, corresponding to an integrated luminosity of $9{\mathrm{fb}}^{-1}$. The results are consistent with the Standard Model and previous tests of lepton universality in related decay modes. The first observation of $B^0\to K_S^0{e}^{+}{e}^{-}$ and $B^{+}\to K^{\ast +}{e}^{+}{e}^{-}$ decays is reported.

All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2021-038.html. v2 - Added two more leptoquark references, and fixed formatting bugs in arXiv title and abstract. v3 - Version of paper published in PRL

References in corpus (39)

• PYTHIA 6.4 Physics and Manual
• Explaining $h\to {\mu }^{\pm }{\tau }^{\mp }$, $B\to K^{\ast }{\mu }^{+}{\mu }^{-}$ and $B\to K{\mu }^{+}{\mu }^{-}/B\to K{e}^{+}{e}^{-}$ in a two-Higgs-doublet model with gauged $L_{\mu }-L_{\tau }$
• Measurement of the Differential Branching Fraction and Forward-Backword Asymmetry for B->K(*)l+l-
• Test of lepton universality in beauty-quark decays
• Angular Distributions of B -> K ll Decays
• $R_K$ and future $b\to s\ell \ell$ BSM opportunities
• Measurement of $CP$-averaged observables in the $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$ decay
• Gauge leptoquark as the origin of B-physics anomalies
• On the impact of power corrections in the prediction of B->K*mu+mu- observables
• B-decay Anomalies in a Composite Leptoquark Model
• Family non-universal Z' models with protected flavor-changing interactions
• On the single leptoquark solutions to the $B$-physics anomalies
• Branching fraction measurements of the rare $B_s^0\to \varphi {\mu }^{+}{\mu }^{-}$ and $B_s^0\to f_2^{\prime }(1525){\mu }^{+}{\mu }^{-}$ decays
• Reading the footprints of the B-meson flavor anomalies
• Implications of new evidence for lepton-universality violation in $b\to s{\ell }^{+}{\ell }^{-}$ decays
• Angular analysis of the $B^{+}\to K^{\ast +}{\mu }^{+}{\mu }^{-}$ decay
• QED Corrections in $\bar{B}\to \bar{K}{\ell }^{+}{\ell }^{-}$ at the Double-Differential Level
• Lessons from the $B^{0,+}\to K^{\ast 0,+}{\mu }^{+}{\mu }^{-}$ angular analyses
• More Indications for Lepton Nonuniversality in $b\to s{\ell }^{+}{\ell }^{-}$
• Third-family quark-lepton unification with a fundamental composite Higgs
• Unified Framework for $B$-Anomalies, Muon $g-2$, and Neutrino Masses
• Precision predictions for scalar leptoquark pair-production at hadron colliders
• Combined explanations of $(g-2{)}_{\mu }$, $R_{D^{(\ast )}}$, $R_{K^{(\ast )}}$ anomalies in a two-loop radiative neutrino mass model
• Explaining $b\to s{\ell }^{+}{\ell }^{-}$ and the Cabibbo Angle Anomaly with a Vector Triplet
• Test of lepton universality with ${\Lambda }_b^0\to p{K}^{-}{\ell }^{+}{\ell }^{-}$ decays
• Gauging the accidental symmetries of the Standard Model, and implications for the flavour anomalies
• Unified explanation of flavor anomalies, radiative neutrino mass and ANITA anomalous events in a vector leptoquark model
• On the new LHCb angular analysis of $B\to K^{\ast }{\mu }^{+}{\mu }^{-}$: Hadronic effects or New Physics?
• Unified SU(4) theory for the $R_{D^{(\ast )}}$ and $R_{K^{(\ast )}}$ anomalies
• $U(1{)}_{B_3-L_2}$ Explanation of the Neutral Current $B-$Anomalies
• Revisiting the $B$-physics anomalies in $R$-parity violating MSSM
• Low Scale $U(1{)}_X$ Gauge Symmetry as an Origin of Dark Matter, Neutrino Mass and Flavour Anomalies
• Anomalies and accidental symmetries: charging the scalar leptoquark under $L_{\mu }$-$L_{\tau }$
• Gravitational Wave Signatures of Lepton Universality Violation
• Explaining $b\to s{\ell }^{+}{\ell }^{-}$ data by sneutrinos in the $R$-parity violating MSSM
• Looking for $B\to X_s{\ell }^{+}{\ell }^{-}$ in non-minimal Universal Extra Dimensional model
• On the LHC signatures of $SU(5)\times U(1{)}^{\prime }$ F-theory motivated models
• Composite Dark Matter and a horizontal symmetry
• Signatures of a Flavor Changing $Z^{\prime }$ Boson in $B_q\to \gamma Z^{\prime }$

Cited by in corpus (44)

• Test of lepton universality in $b\to s{\ell }^{+}{\ell }^{-}$ decays
• Constraints on Lepton Universality Violation from Rare $B$ Decays
• Measurement of lepton universality parameters in $B^{+}\to K^{+}{\ell }^{+}{\ell }^{-}$ and $B^0\to K^{\ast 0}{\ell }^{+}{\ell }^{-}$ decays
• To (b)e or not to (b)e: No electrons at LHCb
• Anomalies in Particle Physics
• Disentangling Lepton Flavour Universal and Lepton Flavour Universality Violating Effects in $b\to s{\ell }^{+}{\ell }^{-}$ Transitions
• Test of lepton flavor universality in B${}^{\pm }$ $\to$ K${}^{\pm }{\mu }^{+}{\mu }^{-}$ and B${}^{\pm }$ $\to$ K${}^{\pm }$e${}^{+}$e${}^{-}$ decays in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Heavy Flavour Physics and CP Violation at LHCb: a Ten-Year Review
• Unified Explanation of the Anomalies in Semi-Leptonic $B$ decays and the $W$ Mass
• New physics in $B\to K^{\ast }{\tau }^{+}{\tau }^{-}$: A model independent analysis
• Combined explanations of $B$-physics anomalies, $(g-2{)}_{e,\mu }$ and neutrino masses by scalar leptoquarks
• Towards excluding a light $Z^{\prime }$ explanation of $b\to s{\ell }^{+}{\ell }^{-}$
• $CP$ violation in $b\to s\ell \ell$: a model independent analysis
• UV physics from IR features: new prospects from top flavor violation
• Consequences of $b\to s{\mu }^{+}{\mu }^{-}$ anomalies on $B\to K^{(\ast )}\nu \bar{\nu }$, $B_s\to (\eta ,{\eta }^{\prime })\nu \bar{\nu }$ and $B_s\to \varphi \nu \bar{\nu }$ decay observables
• Review of sterile neutrino searches at very short-baseline reactor experiments
• Test of lepton flavour universality with $B_s^0\to \varphi {\ell }^{+}{\ell }^{-}$ decays
• Measurement of the ${\Lambda }_b^0\to \Lambda (1520){\mu }^{+}{\mu }^{-}$ differential branching fraction
• A Light shed on Lepton Flavor Universality in B decays
• Search for Rare $b\to d{\ell }^{+}{\ell }^{-}$ Transitions at Belle
• Linking the $R_{K^{(\ast )}}$ anomalies to the Hubble tension via a single right-handed neutrino
• Gravitational wave signals from leptoquark-induced first order electroweak phase transitions
• Data-driven analyses and model-independent fits for present $b\to s\ell \ell$ results
• Exploring New Physics in transition $b\to s{\ell }^{+}{\ell }^{-}$ through different $B_c\to D_s^{(\ast )}{\ell }^{+}{\ell }^{-}$ observables
• Singlet vector leptoquark model facing recent LHCb and BABAR measurements
• Investigating New Physics through the Observables of Semileptonic $B_s\to K^{\ast }(\to K\pi ){\mu }^{+}{\mu }^{-}$ Decay
• Interpreting B-anomalies within an extended 331 gauge theory
• Assessing Lepton Flavor Universality Violations in Semileptonic Decays
• Scrutinizing $B^0$-meson flavor changing neutral current decay into scalar $K_0^{\ast }(1430)$ meson with $b\to s{\ell }^{+}{\ell }^{-}(\nu \bar{\nu })$ transition
• Test of lepton flavour universality with $B^{+}\to K^{+}{\pi }^{+}{\pi }^{-}{\ell }^{+}{\ell }^{-}$ decays
• Pair-production of the charged IDM scalars at high energy CLIC
• Theoretical Review of Rare B Decays
• Rare decays of the $B_s-$meson into four charged leptons in the framework of the Standard Model
• Decay $B_c^{+}\to D_{(s)}^{(\ast )+}{\ell }^{+}{\ell }^{-}$ within covariant confined quark model
• Round table on Standard Model Anomalies
• Constraints on new physics from decays of polarized ${\Lambda }_b^0$ baryons at the FCC-ee
• Semileptonic neutral current decays of ${\Xi }_b$ with dileptons or dineutrinos in the final state
• Recent progress in decays of $b$ and $c$ hadrons
• Non-parametric and continuous extraction of amplitudes in electroweak penguin decays
• Anomalies in the heavy sector
• Probing mixed-state dark matter and flavor observables in a scalar-assisted baryonic gauge theory
• Lepton Flavour Universality tests and Lepton Flavour Violation searches at LHCb
• Flavor Anomalies and Quark-Lepton Unification
• Flavour Physics at LHCb -- 50 years of the KM paradigm