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arXiv · 1207.4004

Impact of $B\to K^\ast_0 \ell^+\ell^-$ on the New Physics search in $B\to K^\ast \ell^+\ell^-$ decay

Damir Becirevic·Andrey Tayduganov
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Abstract

We discuss the uncertainty related to the amount of unwanted $B\to K_0^\ast (Kπ)\ell^+\ell^-$ events in the sample of $B\to K^\ast (Kπ)\ell^+\ell^-$. Those events can increase the measured differential decay rate by up to 10% in the low $q^2$ region, and can be a source of non-negligible uncertainty in the full angular distribution of the $B\to K^\ast (Kπ)\ell^+\ell^-$ decay. Although the transverse asymmetries should be unaffected by the presence of the $S$-wave $Kπ$ pairs, coming from the scalar $K_0^\ast$ meson, we show that in practice their normalization might be sensitive to those events and could entail a sizable uncertainty in transverse asymmetries around $q^2=2 GeV^2$. For other $q^2$'s that error is under about 10%.

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Damir Becirevic, Andrey Tayduganov. 2012-12-09. Impact of $B\to K^\ast_0 \ell^+\ell^-$ on the New Physics search in $B\to K^\ast \ell^+\ell^-$ decay. https://doi.org/10.1016/j.nuclphysb.2012.11.016

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