Leptoquarks in Flavour Physics

Abstract

While the LHC has not directly observed any new particle so far, experimental results from LHCb, BELLE and BABAR point towards the violation of lepton flavour universality in $b\to s{\ell }^{+}{\ell }^{-}$ and $b\to c\ell \nu$. In this context, also the discrepancy in the anomalous magnetic moment of the muon can be interpreted as a sign of lepton flavour universality violation. Here we discuss how these hints for new physics can also be explained by introducing leptoquarks as an extension of the Standard Model. Indeed, leptoquarks are good candidates to explain the anomaly in the anomalous magnetic moment of the muon because of an $m_t/m_{\mu }$ enhanced contribution giving correlated effects in $Z$ boson decays which is particularly interesting in the light of future precision experiments.

7 pages, 6 figures, proceedings for "Flavour changing and conserving processes", 2017

References in corpus (16)

• Test of lepton universality using $B^{+}\to K^{+}{\ell }^{+}{\ell }^{-}$ decays
• Confronting lepton flavor universality violation in B decays with high-$p_T$ tau lepton searches at LHC
• Measurement of the ratio of branching fractions $\mathcal{B}(B_c^{+}\to J/\psi {\tau }^{+}{\nu }_{\tau })$/$\mathcal{B}(B_c^{+}\to J/\psi {\mu }^{+}{\nu }_{\mu })$
• Gauge leptoquark as the origin of B-physics anomalies
• New physics in the weak interaction of $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$
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• B-decay Anomalies in a Composite Leptoquark Model
• Leptoquark Flavor Patterns & B Decay Anomalies
• Constraint on the branching ratio of B_c \to tau nu from LEP1 and consequences for R(D(*)) anomaly
• $(g-2{)}_{\mu }$, Lepton Flavour Violation and $Z$ Decays with Leptoquarks: Correlations and Future Prospects
• Explaining the $R_K$ and $R_{D^{(\ast )}}$ anomalies with vector leptoquarks
• The role of the $S_3$ GUT leptoquark in flavor universality and collider searches
• Testing Minimal Flavor Violation in Leptoquark Models of the $R_{K^{(\ast )}}$ Anomaly
• Invoking Chiral Vector Leptoquark to explain LFU violation in B Decays
• Leptoquark models for the $B$-physics anomalies

Cited by in corpus (6)

• Combined explanations of $(g-2{)}_{\mu }$, $R_{D^{(\ast )}}$, $R_{K^{(\ast )}}$ anomalies in a two-loop radiative neutrino mass model
• $R_2$ as a single leptoquark solution to $R_{D^{(\ast )}}$ and $R_{K^{(\ast )}}$
• A Common Origin of Neutrino Masses and $R_{D^{(\ast )}}$, $R_{K^{(\ast )}}$ Anomalies
• $R(K^{(\ast )})$ from dark matter exchange
• Collider signature of $U_1$ Leptoquark and constraints from $b\to c$ observables
• Marriage between neutrino mass and flavor anomalies