1086 articles – 5326 references  [version française]
 HAL: hal-00718916, version 1
 arXiv: 1207.4004
 Nuclear Physics B 868, 2 (2012) 368-382
 Impact of on the New Physics search in B→K⁎ℓ+ℓ− decay
 (2012)
 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%.
 Research team: Groupe Théorie
 Subject : Physics/High Energy Physics - ExperimentPhysics/High Energy Physics - Phenomenology