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Right-handed interactions in puzzling $B$-decays
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abstract
We explain the difference between the measured decay widths of $b \to c \tau \nu$ processes and of $B\to K\nu\bar{\nu}$ and their values predicted in the Standard Model by introducing the right-handed interactions both to quarks and to leptons. At low energy scales, in addition to the Standard Model particles, we assume the presence of an additional neutral lepton (right-handed neutrino). We then show a specific realization of such a scenario in a model with a single scalar leptoquark ($S_1$), and discuss the corresponding phenomenology.
Forward citations
Cited by 5 Pith papers
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Challenging Majorana neutrino effects in $B\to K^{(\ast)}\nu\nu$ and $K\to \pi\nu\nu$ decays
Belle-II's B→Kνν excess cannot be explained by dimension-7 lepton-number-violating SMEFT operators without fine-tuning neutrino masses, while a light sterile-neutrino extension can, with testable decay spectra.
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Radiative generation of chiral vector operators in $b\to s \nu\bar{\nu}$ transition
Minimal one-loop models that generate both chiral vector operators for b→sνν̄ are systematically classified but cannot quantitatively explain the Belle II anomaly.
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Gauged $\tau$-lepton chiral currents and $B \to K^{(*)} E_{\rm miss}$
Gauging chiral tau lepton number with a light X boson of mass about 2.1 GeV explains the Belle II B to K missing-energy excess and survives existing bounds.
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Are the new particles heavy or light in $b \to s E_{\mathrm{miss}}$?
The K* longitudinal polarization fraction separates heavy NP, light vector, and ALP explanations of the Belle-II B+ to K+ missing-energy excess, while the Lambda_b to Lambda polarization tags operator chirality.
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On the EFT validity for Drell-Yan tails at the LHC
For t-channel mediators such as the U1 leptoquark, Drell-Yan EFT bounds are accurate at the 10% level for masses above about 1.5 TeV when the series is truncated at amplitude level, while s-channel mediators need E mu...
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