Impact of on the New Physics search in B→K⁎ℓ+ℓ− decay

Damir Becirevic (1) , Andrey Tayduganov (2)

1 LPT - Laboratoire de Physique Théorique d'Orsay [Orsay]
2 Groupe Théorie

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%.

Domaines: Physique des Hautes Energies - Expérience [hep-ex]; Physique des Hautes Energies - Phénoménologie [hep-ph]

Damir Becirevic, Andrey Tayduganov. Impact of on the New Physics search in B→K⁎ℓ+ℓ− decay. Nuclear Physics B, 2012, 868 (2), pp.368-382. ⟨10.1016/j.nuclphysb.2012.11.016⟩. ⟨hal-00718916⟩