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Study of B(s)0→KS0h+h′−B_{(s)}^0 \to K_{\rm S}^0 h^{+} h^{\prime -} decays with first observation of Bs0→KS0K±π∓B_{s}^0 \to K_{\rm S}^0 K^{\pm} \pi^{\mp} and Bs0→KS0π+π−B_{s}^0 \to K_{\rm S}^0 \pi^{+} \pi^{-}

Collaboration
Jul 29, 2013
22 pages
Published in:
  • JHEP 10 (2013) 143
  • Published: 2013
e-Print:
DOI:
Report number:
  • CERN-PH-EP-2013-139,
  • LHCB-PAPER-2013-042
Experiments:
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Abstract: (arXiv)
A search for charmless three-body decays of B0B^0 and Bs0B_{s}^0 mesons with a KS0K_{\rm S}^0 meson in the final state is performed using the pppp collision data, corresponding to an integrated luminosity of 1.0\,\mbox{fb}^{-1}, collected at a centre-of-mass energy of 7 TeV7\mathrm{\,Te\kern -0.1em V} recorded by the LHCb experiment. Branching fractions of the B(s)0→KS0h+h′−B_{(s)}^0 \to K_{\rm S}^0 h^{+} h^{\prime -} decay modes (h(′)=π,Kh^{(\prime)} = \pi, K), relative to the well measured B0→KS0π+π−B^0 \to K_{\rm S}^0 \pi^{+} \pi^{-} decay, are obtained. First observation of the decay modes Bs0→KS0K±π∓B_s^0 \to K_{\rm S}^0 K^{\pm} \pi^{\mp} and Bs0→KS0π+π−B_s^0 \to K_{\rm S}^0 \pi^{+} \pi^{-} and confirmation of the decay B0→KS0K±π∓B^0 \to K_{\rm S}^0 K^{\pm} \pi^{\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} \pi^{\mp})}{{\cal B}(B^0 \to K_{\rm S}^0 \pi^{+} \pi^{-})} &=& 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 \pi^{+} \pi^{-})} &=& 0.385 \pm 0.031 \, ({\rm stat.}) \pm 0.023 \, ({\rm syst.}) \,, \\ \nonumber \frac{{\cal B}(B_s^0 \to K_{\rm S}^0 \pi^{+} \pi^{-} )}{{\cal B}(B^0 \to K_{\rm S}^0 \pi^{+} \pi^{-})} &=& 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} \pi^{\mp})}{{\cal B}(B^0 \to K_{\rm S}^0 \pi^{+} \pi^{-})} &=& 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 \pi^{+} \pi^{-})} &\in& [0.004;0.068] \; {\rm at \;\; 90\% \; CL} \,. \end{eqnarray*}
Note:
  • 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
  • Hadron-Hadron Scattering
  • Branching fraction
  • B physics
  • Flavor physics
  • p p: interaction
  • B0: hadronic decay
  • B/s0: hadronic decay
  • final state: (0charm)
  • K0(S): final state
  • B0: branching ratio
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