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Nuclear Physics B 868, 2 (2012) 368-382
Impact of on the New Physics search in B→K⁎ℓ+ℓ− decay
Damir Becirevic1, Andrey Tayduganov1, 2

We discuss the uncertainty related to the amount of unwanted $B\to K_0^\ast (K\pi)\ell^+\ell^-$ events in the sample of $B\to K^\ast (K\pi)\ell^+\ell^-$. 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 $B\to K^\ast (K\pi)\ell^+\ell^-$ decay. Although the transverse asymmetries should be unaffected by the presence of the $S$-wave $K\pi$ pairs, coming from the scalar $K_0^\ast$ meson, we show that in practice their normalization is sensitive to the those events and can entail a sizable uncertainty in transverse asymmetries around $q^2=2$ GeV. For other $q^2$'s that error is under about 10%.
1:  LPT - Laboratoire de Physique Théorique d'Orsay [Orsay]
2:  LAL - Laboratoire de l'Accélérateur Linéaire
Groupe Théorie
Physics/High Energy Physics - Experiment

Physics/High Energy Physics - Phenomenology
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