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New physics in $b\to s$ transitions after LHC run 1
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abstract
We present results of global fits of all relevant experimental data on rare $b \to s$ decays. We observe significant tensions between the Standard Model predictions and the data. After critically reviewing the possible sources of theoretical uncertainties, we find that within the Standard Model, the tensions could be explained if there are unaccounted hadronic effects much larger than our estimates. Assuming hadronic uncertainties are estimated in a sufficiently conservative way, we discuss the implications of the experimental results on new physics, both model independently as well as in the context of the minimal supersymmetric standard model and models with flavour-changing $Z'$ bosons. We discuss in detail the violation of lepton flavour universality as hinted by the current data and make predictions for additional lepton flavour universality tests that can be performed in the future. We find that the ratio of the forward-backward asymmetries in $B \to K^* \mu^+\mu^-$ and $B \to K^* e^+e^-$ at low dilepton invariant mass is a particularly sensitive probe of lepton flavour universality and allows to distinguish between different new physics scenarios that give the best description of the current data.
Forward citations
Cited by 7 Pith papers
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HyperIso: A general BSM calculator for flavour observables
HyperIso is a new modular software tool that computes flavour observables and BSM Wilson coefficients, validated against SuperIso and MARTY, with a copula-based uncertainty engine.
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Disentangling short- vs. long-distance dynamics in $B\to K^{*}\mu^+\mu^-$
Dispersive resonance modeling of non-local effects in B o K*μ+μ- reduces the C9 anomaly to ≤2σ while yielding precise postdictions for S7,8,9.
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Flavour anomalies and (fundamental) partial compositeness
Partial compositeness in the minimal fundamental partial compositeness (MFPC) model explains B-meson flavour anomalies while also solving the SM naturalness problem.
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$B \to X_{\mathrm{s}} l^{+} l^{-}$ in the $\mu$ from $\nu$ Supersymmetric Standard Model
In the μνSSM, B→X_s l+l− is dominated by charged-Higgs C7 in the low-q² region and C9/C10 Z-penguins in the high-q² region, with the forward-backward asymmetry set by C7C10 and C9C10 interference.
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Angular observables and branching ratio for $B_s\to \phi \ell^+ \ell^-$ decay
Using the covariant confined quark model, the paper predicts branching fraction, F_L, A_FB and optimized angular observables for B_s → φ ℓ+ℓ− and finds broad agreement with LHCb data.
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Measurement of $B \to K{}^{*}(892)\gamma$ decays at Belle II
Belle II's first measurement of B→K*(892)γ decays yields branching fractions, CP asymmetries, and an isospin asymmetry consistent with the Standard Model and previous experiments.
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Heavy-heavy and heavy-light mesons in cold nuclear matter
Using the quark-meson coupling model and effective Lagrangians, heavy and heavy-light mesons are predicted to feel attractive potentials in nuclei and form bound states, including new B_c-nucleus states.
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