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

Damir Becirevic 1 Andrey Tayduganov 2
2 Groupe Théorie
LPT - Laboratoire de Physique Théorique d'Orsay [Orsay], LAL - Laboratoire de l'Accélérateur Linéaire
Abstract : 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%.
Document type :
Journal articles
Nuclear Physics B, Elsevier, 2012, 868 (2), pp.368-382. <10.1016/j.nuclphysb.2012.11.016>


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Submitted on : Wednesday, July 18, 2012 - 2:58:00 PM
Last modification on : Monday, October 13, 2014 - 3:43:25 PM

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

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