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2017

New light mediators for the $R_K$ and $R_{K^*}$ puzzles

Datta, Alakabha, Kumar, Jacky, Liao, Jiajun et al.

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The measurements of $R_{K}$ and $R_K^{*}$ provide hints for the violation of lepton universality.

However, it is generally difficult to explain the $R_{K^*}$ measurement in the low $q^2$ range, $0.045 \le q^2 \le 1.1$ GeV$^2$.
Light mediators offer a solution by making the Wilson coefficients $q^2$ dependent.
We check if new lepton nonuniversal interactions mediated by a scalar ($S$) or vector particle ($Z^\prime$) of mass between $10-200$ MeV can reproduce the data.

New light mediators for the $R_K$ and $R_{K^*}$ puzzles · Around

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