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Four-Loop Anomalous Dimensions for Radiative Flavour-Changing Decays
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We evaluate the complete four-loop anomalous dimension matrix that is necessary for determining the effective flavour-changing neutral current couplings qbar-q'-gamma and qbar-q'-g at the next-to-next-to-leading order in QCD. The resulting O(alpha_s^2(mu_b)) correction to the B -> X_s gamma branching ratio amounts to around -2.9% for mu_b = 5 GeV, and -4.4% for mu_b = 2.5 GeV
Forward citations
Cited by 4 Pith papers
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The photon-energy spectrum in $B\to X_s\gamma$ to N$^3$LO: light-fermion and large-$N_{\rm c}$ corrections
N3LO calculation of the B to Xs gamma photon spectrum including complete light-fermion corrections, two massive fermion loops, and large-Nc terms, with improved results in kinetic and MSR mass schemes.
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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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Precision tests of third-generation four-quark operators: $gg \to h$ and $h \to \gamma \gamma$
Two-loop SMEFT corrections from third-generation four-quark operators to gg to h and h to gamma gamma are computed with full mass dependence, including new two-loop anomalous dimensions.
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Radiative B to tensor meson decays at NLO in SCET
An NLO SCET calculation predicts B(B to K2*(1430) gamma) = (16.7 ± 6.4 ± 1.2) × 10^-6, close to the experimental average, with much smaller predictions for the a2 and f2 modes.
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