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2014

$R_K$ and future $b \to s \ell \ell$ BSM opportunities

Hiller, Gudrun, Schmaltz, Martin

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Flavor changing neutral current $|\Delta B|=|\Delta S|=1$ processes are sensitive to possible new physics at the electroweak scale and beyond, providing detailed information about flavor, chirality and Lorentz structure.

Recently the LHCb collaboration announced a $2.6 \sigma$ deviation in the measurement of $R_K={\cal{B}}(\bar B \to \bar K \mu \mu)/{\cal{B}}(\bar B \to \bar K ee)$ from the standard model's prediction of lepton universality.
We identify dimension six operators which could explain this deviation and study constraints from other measurements.
Vector and axial-vector four-fermion operators with flavor structure $\bar s b \bar \ell \ell$ can provide a good description of the data.

$R_K$ and future $b \to s \ell \ell$ BSM opportunities · Around

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