Tree-level lepton universality violation in the presence of sterile neutrinos: impact for $R_K$ and $R_{\pi }$

Abstract

We consider a tree-level enhancement to the violation of lepton flavour universality in light meson decays arising from modified $W\ell \nu$ couplings in the standard model minimally extended by sterile neutrinos. Due to the presence of additional mixings between the active (left-handed) neutrinos and the new sterile states, the deviation from unitarity of the leptonic mixing matrix intervening in charged currents might lead to a tree-level enhancement of $R_P=\Gamma (P\to e\nu )/\Gamma (P\to \mu \nu )$, with $P=K,\pi$. We illustrate these enhancements in the case of the inverse seesaw model, showing that one can saturate the current experimental bounds on $\Delta r_K$ (and $\Delta r_{\pi }$), while in agreement with the different experimental and observational constraints.

9 pages, 2 eps figures

References in corpus (11)

• Global status of neutrino oscillation parameters after Neutrino-2012
• Effects of new leptons in Electroweak Precision Data
• Non-Standard Neutrino Interactions with Matter from Physics Beyond the Standard Model
• Sensitivity to charged scalars in $B\to D^{(\ast )}\tau {\nu }_{\tau }$ and $B\to \tau {\nu }_{\tau }$ decays
• Muon conversion to electron in nuclei in type-I seesaw models
• The Standard Model prediction for R_{e/mu}^{(pi,K)}
• MeV sterile neutrinos in low reheating temperature cosmological scenarios
• Sterile neutrinos: direct mixing effects versus induced mass matrix of active neutrinos
• Anatomy and Phenomenology of the Lepton Flavor Universality in SUSY Theories
• Searching for sterile neutrinos from $\pi$ and $K$ decays
• Supersymmetric Grand Unification and Lepton Universality in K-> l νDecays

Cited by in corpus (54)

• A facility to Search for Hidden Particles at the CERN SPS: the SHiP physics case
• Neutrinos and Collider Physics
• A White Paper on keV Sterile Neutrino Dark Matter
• The Phenomenology of Right Handed Neutrinos
• Global constraints on heavy neutrino mixing
• New physics searches in nuclear and neutron $\beta$ decay
• Testing sterile neutrino extensions of the Standard Model at future lepton colliders
• Direct Bounds on Electroweak Scale Pseudo-Dirac Neutrinos from $\sqrt{s}=8$ TeV LHC Data
• On the description of non-unitary neutrino mixing
• Looking for the minimal inverse seesaw realisation
• Imprints of massive inverse seesaw model neutrinos in lepton flavor violating Higgs boson decays
• Global Fit to Modified Neutrino Couplings and the Cabibbo-Angle Anomaly
• Constraints on Sterile Neutrinos in the MeV to GeV Mass Range
• Lepton flavor violation in low-scale seesaw models: SUSY and non-SUSY contributions
• Combining Experimental and Cosmological Constraints on Heavy Neutrinos
• Sterile neutrinos in leptonic and semileptonic decays
• Improving Electro-Weak Fits with TeV-scale Sterile Neutrinos
• Indirect searches for sterile neutrinos at a high-luminosity Z-factory
• Light and Superlight Sterile Neutrinos in the Minimal Radiative Inverse Seesaw Model
• Global Effective-Field-Theory analysis of New-Physics effects in (semi)leptonic kaon decays
• Probing CP violation with non-unitary mixing in long-baseline neutrino oscillation experiments: DUNE as a case study
• Effective Majorana mass matrix from tau and pseudoscalar meson lepton number violating decays
• Probing leptogenesis with GeV-scale sterile neutrinos at LHCb and BELLE II
• Loop level constraints on Seesaw neutrino mixing
• Improved Constraints on Sterile Neutrinos in the MeV to GeV Mass Range
• Impact of sterile neutrinos on nuclear-assisted cLFV processes
• Effect of steriles states on lepton magnetic moments and neutrinoless double beta decay
• Neutrino masses, leptogenesis and dark matter from small lepton number violation?
• Lepton flavor violating Z decays: A promising window to low scale seesaw neutrinos
• Effective lepton flavor violating $\mathbf{H}{\mathbf{\ell }}_{\mathbf{i}}{\mathbf{\ell }}_{\mathbf{j}}$ vertex from right-handed neutrinos within the mass insertion approximation
• Generalized Inverse Seesaws
• Electric Dipole Moments of Charged Leptons with Sterile Fermions
• Neutrino oscillations and the seesaw origin of neutrino mass
• In-flight cLFV conversion: $e-\mu$, $e-\tau$ and $\mu -\tau$ in minimal extensions of the Standard Model with sterile fermions
• Lepton-Jets and Low-Mass Sterile Neutrinos at Hadron Colliders
• Sterile neutrinos facing kaon physics experiments
• Gauged Lepton Flavour
• Heavy neutral leptons and high-intensity observables
• On the role of leptonic CPV phases in cLFV observables
• Electron electric dipole moment in Inverse Seesaw models
• One-loop effective LFV $Z{l}_k{l}_m$ vertex from heavy neutrinos within the Mass Insertion Approximation
• Lepton Universality in the $\nu$MSM
• Perspectives for tests of neutrino mass generation at the GeV scale: Experimental reach versus theoretical predictions
• Comprehensive Analysis of Charged Lepton Flavour Violation in the Symmetry Protected Type-I Seesaw
• LFV Higgs and $Z$-boson decays: leptonic CPV phases and CP asymmetries
• Lepton Flavor Violation in a $Z^{\prime }$ model for the $b\to s$ anomalies
• Spontaneous R-parity violation in the minimal gauged $(B-L)$ supersymmetry with a $125\mathrm{GeV}$ Higgs
• The Type-I Seesaw family
• Heavy neutrino mixing in the T2HK, the T2HKK and an extension of the T2HK with a detector at Oki Islands
• Probing non-unitary neutrino mixing via long-baseline neutrino oscillation experiments based at J-PARC
• Lepton flavor violation in inverse seesaw model
• MeV Sterile Neutrino in light of the Cabibbo-Angle Anomaly
• Rare Kaon Decay Experiments at CERN
• How many new particles do we need after the Higgs boson?