Study of $B_{(s)}^0 \to K_{\rm S}^0 h^{+} h^{\prime -}$ decays with first observation of $B_{s}^0 \to K_{\rm S}^0 K^{\pm} π^{\mp}$ and $B_{s}^0 \to K_{\rm S}^0 π^{+} π^{-}$
Creators: name: LHCb Collaboration
name: Aaij, R.
name: Adeva, B.
name: Adinolfi, M.
name: Adrover, C.
name: Affolder, A.
name: Ajaltouni, Z.
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Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: A search for charmless three-body decays of $B^0$ and $B_{s}^0$ mesons with a $K_{\rm S}^0$ meson in the final state is performed using the $pp$ collision data, corresponding to an integrated luminosity of $1.0\,\mbox{fb}^{-1}$, collected at a centre-of-mass energy of $7\mathrm{\,Te\kern -0.1em V}$ recorded by the LHCb experiment. Branching fractions of the $B_{(s)}^0 \to K_{\rm S}^0 h^{+} h^{\prime -}$ decay modes ($h^{(\prime)} = π, K$), relative to the well measured $B^0 \to K_{\rm S}^0 π^{+} π^{-}$ decay, are obtained. First observation of the decay modes $B_s^0 \to K_{\rm S}^0 K^{\pm} π^{\mp}$ and $B_s^0 \to K_{\rm S}^0 π^{+} π^{-}$ and confirmation of the decay $B^0 \to K_{\rm S}^0 K^{\pm} π^{\mp}$ are reported. The following relative branching fraction measurements or limits are obtained \begin{eqnarray*} \nonumber \frac{{\cal B}(B^0 \to K_{\rm S}^0 K^{\pm} π^{\mp})}{{\cal B}(B^0 \to K_{\rm S}^0 π^{+} π^{-})} &amp;=&amp; 0.128 \pm 0.017 \, ({\rm stat.}) \pm 0.009 \, ({\rm syst.}) \,, \\ \nonumber \frac{{\cal B}(B^0 \to K_{\rm S}^0 K^{+} K^{-} )}{{\cal B}(B^0 \to K_{\rm S}^0 π^{+} π^{-})} &amp;=&amp; 0.385 \pm 0.031 \, ({\rm stat.}) \pm 0.023 \, ({\rm syst.}) \,, \\ \nonumber \frac{{\cal B}(B_s^0 \to K_{\rm S}^0 π^{+} π^{-} )}{{\cal B}(B^0 \to K_{\rm S}^0 π^{+} π^{-})} &amp;=&amp; 0.29\phantom{0} \pm 0.06\phantom{0} \, ({\rm stat.}) \pm 0.03\phantom{0} \, ({\rm syst.}) \pm 0.02 \, (f_s/f_d) \,, \\ \nonumber \frac{{\cal B}(B_s^0 \to K_{\rm S}^0 K^{\pm} π^{\mp})}{{\cal B}(B^0 \to K_{\rm S}^0 π^{+} π^{-})} &amp;=&amp; 1.48\phantom{0} \pm 0.12\phantom{0} \, ({\rm stat.}) \pm 0.08\phantom{0} \, ({\rm syst.}) \pm 0.12 \, (f_s/f_d) \,, \\ \nonumber \frac{{\cal B}(B_s^0 \to K_{\rm S}^0 K^{+} K^{-} )}{{\cal B}(B^0 \to K_{\rm S}^0 π^{+} π^{-})} &amp;\in&amp; [0.004;0.068] \; {\rm at \;\; 90\% \; CL} \,. \end{eqnarray*}
description: 18 pages, 4 figures, published in JHEP. Changes in v2 are minor changes to the text and the presentation of the figures following suggestions from journal referees